Mds 2310a 5a6i5e

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900 MHz Radio Transceiver MDS 05-2900A01, Rev. B JULY 1997

Installation and Operation Guide

MDS 2310A

QUICK START GUIDE Below are the basic steps for installing the transceiver. For detailed procedures, refer to the page numbers given in parentheses.

1. radio configuration (Page 4) ¥ Check the test data sheets packed with the transceiver to be sure the radio is properly configured for the intended application.

2. Securely mount the transceiver (Page 4) ¥ Use the MDS-supplied mounting brackets and four screws or bolts. (Fasteners are not supplied.) ¥ Choose a mounting location that allows easy access to the connectors on the end of the radio and an unobstructed view of the LED status indicators.

3. Connect and apply DC power to the radio (Page 6) ¥ Set supply voltage to 13.8 volts. This is the transceiverÕs nominal operating voltage. ¥ Observe proper polarity. The red wire is the positive lead. ¥ Insert the radioÕs power plug and tighten the retaining screw.

4. Install and connect the antenna system to the radio (Page 6) ¥ Use good quality, low loss coaxial cable. Keep the feedline as short as possible. ¥ Preset the antenna in the direction of the master station.

5. Connect the data equipment to the radio INTERFACE connector (Page 8) ¥ Connection must be made with a DB-25 Male (25 pin) connector. (See Table 4 for wiring.) ¥ Connect only the required pins. Do not use a straight-through RS-232 cable with all pins wired. ¥ the equipment connected to the INTERFACE connector is configured as DTE. The radio is configured as DCE (data communications equipment).

6. proper operation by observing the LED display ¥ See the Table below for interpretation of status LEDs. ¥ Refine the antenna heading for maximum received signal strength. This can be done with a DC voltmeter at Pin 21 of the INTERFACE connector, or with a Hand-Held Terminal. (See Page 7.) PWR TX C D

RTS TXD RXD

LED

FUNCTION

INDICATION

PWR

Power

Power is applied to the radio.

TX

Transmit

Radio transmitter keyed. Normally lights when the radio is transmitting.

CD

Carrier Detect

Lights when carrier signal from master station is detected.

TXD

Transmit Data

Indicates status of the Transmit Data line from the external device (LED OFF = 0, LED ON = 1). Flashes with TX data flow.

RXD

Receive Data

Status of the Receive Data (RXD) line to the external device (LED OFF = 0, LED ON = 1). Flashes with RX data flow.

RTS

Request-to-Send Indicates connected device has issued a request-to-send data.

Table of Contents INTRODUCTION ------------------------------------------------------------------------------------------------------------- 1 ABOUT THIS GUIDE .................................................................................................................................... 1 TRANSCEIVER DESCRIPTION ................................................................................................................... 1 LICENSING .................................................................................................................................................... 1 TRANSCEIVER OPTIONS & ACCESSORIES ............................................................................................ 2 MODEL NUMBER CODES ........................................................................................................................... 2 TRANSCEIVER SPECIFICATIONS ............................................................................................................. 3 INSTALLATION--------------------------------------------------------------------------------------------------------------- 4 UNPACKING & INSPECTION ..................................................................................................................... 4 Configuration Check .................................................................................................................. 4 INSTALLATION REQUIREMENTS............................................................................................................. 4 Mounting the Transceiver .......................................................................................................... 4 Power Requirements .................................................................................................................. 6 Antenna System Selection ......................................................................................................... 6 Antenna Mounting ..................................................................................................................... 7 Antenna Aiming ......................................................................................................................... 7 SWR Check ................................................................................................................................ 8 INTERFACE CONNECTIONS ...................................................................................................................... 8 OPERATION----------------------------------------------------------------------------------------------------------------- 10 INITIAL STARTUP ...................................................................................................................................... 10 PROGRAMMING & CONTROL...................................................................................................... 10 Using a PC for Transceiver Control ......................................................................................... 10 Hand-Held Terminal Connection & Startup ............................................................................ 10 KEYBOARD COMMANDS ......................................................................................................................... 12 TROUBLESHOOTING ---------------------------------------------------------------------------------------------------- 14 This section presents some system problems that may be encountered and suggests possible remedies. MODEM SWITCH SETTINGS------------------------------------------------------------------------------------------- 17 This section describes modem switch settings for 4800 and 9600 bps internal modems. AUDIO PROCESSING MODULE SWITCH SETTINGS --------------------------------------------------------- 18 This section describes switch settings for the optional Audio Processing Module. IN CASE OF DIFFICULTY FACTORY TECHNICAL ASSISTANCE ........................................................................... Inside Rear Cover FACTORY REPAIRS .......................................................................................................... Inside Rear Cover

MDS 05-2900A01, Rev. B

i

ILLUSTRATIONS Figure 1. Transceiver Connectors & Indicators .............................................................................................. 1 Figure 2. Model Number Codes....................................................................................................................... 2 Figure 3. Transceiver, Instruction Guide, Power Cable................................................................................... 4 Figure 4. Typical Station Arrangement............................................................................................................ 5 Figure 5. Transceiver Mounting Dimensions .................................................................................................. 5 Figure 6. RSSI Voltage vs. Signal Strength in dBm (Typical) ........................................................................ 7 Figure 7. The MDS Hand-Held Terminal Quick Reference Guide ............................................................... 11 Figure 8. Hand-Held Terminal Connected to the Transceiver....................................................................... 11 Figure 9. Location of Fuse F1 and Other Major Components ....................................................................... 15 Figure 10. Transceiver Block Diagram .......................................................................................................... 16 Figure 11. Configuration Switch Location on the Modem ............................................................................ 17 Figure 12. Configuration Switch Location on the Audio Processing Module............................................... 18 TABLES Table 1. Transceiver Options ........................................................................................................................... 2 Table 2. Suitable Antenna Types ..................................................................................................................... 6 Table 3. Length vs. Loss in Coaxial Cables at 960 MHz ................................................................................ 6 Table 4. J1 Interface Connector Pinouts .......................................................................................................... 8 Table 5. LED Status Indicators ...................................................................................................................... 10 Table 6. Programming and Test CommandsÑPart 1 of 3 ............................................................................. 12 Table 7. Troubleshooting Chart ..................................................................................................................... 14 Table 8. 4800/9600 BPS Modem Switch Settings ......................................................................................... 17 Table 9. Configuration Switch Settings ......................................................................................................... 18

WARNINGÑEXPLOSION HAZARD Do not disconnect live electrical circuitry from the radio unless area is known to be non-hazardous.

ii

Table of Contents

MDS 05-2900A01, Rev. B

INTRODUCTION ABOUT THIS GUIDE This guide presents installation and operating instructions for the MDS 2310A radio transceiver. Because several possible configurations of the radio exist, some of the features described here may not apply to your particular transceiver. Consult the factory if you have questions regarding the capabilities of your unit. For technical and servicing information, including alignment procedures, refer to the MDS 2310A Technical Manual (MDS P/N 05-2905A01). the factory for the price and availability of this manual. TRANSCEIVER DESCRIPTION The transceiver offers continuous duty, high performance data communications in the 900 MHz frequency band. The unit is fully synthesized and can be programmed to operate over all available MAS channels (in 6.25 kHz increments) within its frequency range. The transceiverÕs design is highlighted by a compact and rugged die-cast aluminum case that houses the main RF unit and up to two optional plug-in assemblies. The radio is well suited for use in unattended field installations, and need only be protected from direct exposure to the weather. Figure 1 shows the transceiver's external connectors and indicators. A microcontroller inside the transceiver provides control, programming and interrogation of key diagnostic data. These features are accessible by using the optional MDS Hand-Held Terminal or a personal computer running MDS software. This makes it possible to perform many checks and adjustments without removing the cover of the radio. SERIAL NUMBER LABEL

Figure 1. Transceiver Connectors & Indicators

EXTERNAL INTERFACE CONNECTOR (DB-25) LED STATUS

13.8 VDC POWER CONNECTOR ANTENNA CONNECTOR (TYPE “N”)

LICENSING For operation in the U.S.A. the transceiver must be used in a system licensed by the Federal Communications Commission. When used outside the U.S.A., appropriate governmental regulations should be followed.

MDS 05-2900A01, Rev. B

Installation & Operation Guide

1

TRANSCEIVER OPTIONS & ACCESSORIES The basic transceiver can be equipped with one or more of the optional assemblies listed in TableÊ1. MDS for information on adding options to the transceiver. Table 1. Transceiver Options OPTION

DESCRIPTION

MDS PART NO.

1200 bps Modem

Internal subassembly that mounts vertically into jacks J6 and J8 on the main transceiver board. Equips the radio for analog data transmission at up to 1200 bits-per-second using AFSK (Bell 202T) signaling.

03-1815A01

4800 bps Modem

Internal subassembly that mounts vertically into jacks J6 and J8 on the main transceiver board. Equips the radio for data transmission at 300 to 4800 bitsper-second using direct digital modulation (FSK).

03-1831A11 (Asynchronous)

9600 bps Modem

Internal subassembly that mounts vertically into jacks J6 and J8 on the main transceiver board. Equips the radio for data transmission at 9600 bits-persecond using direct digital modulation (FSK).

03-1833A01

Audio Processing Module

Internal subassembly that mounts vertically into jacks J6 and J8 on the main transceiver board. Provides audio conditioning and VOX keying control of the transmitter. For use with external modems.

03-1912A01

Remote Maintenance Module

Internal subassembly that mounts vertically into jacks J5 and J7 on the main 03-1958A01 transceiver board. Provides for both local and over-the-air diagnostics & control of the transceiver.

Order Wire Module

External device that plugs into the radioÕs INTERFACE connector. Can be used with a standard telephone handset (listed below) to provide temporary voice communications with the master station during setup and testing of the radio system.

02-1297A01

Order Wire Handset

Plugs into Order Wire Module (listed above) for temporary voice communications during setup and testing of the radio system.

12-1307A01

Hand-Held Terminal (HHT) Kit

External keypad and display device that plugs into the radioÕs INTERFACE connector. Allows local radio programming, diagnostics & control. Includes carrying case and cable set.

02-1501A01

RS-232 to RS-422 Converter Assembly

External adapter plug used to convert the radioÕs INTERFACE connector to RS-422 compatible signaling.

03-2358A01

TTL Converter Assembly

External adapter plug that converts the radio's INTERFACE connector to TTL compatible signaling.

03-2223A01

MDS Programming Software

Allows programming of the transceiver with an IBM (or compatible) personal computer. Software must be revision 2.6 or higher.

02-1972Axx

Remote Radio Diagnostics

Diagnostics and configuration of any MDS transceiver connected to PC (Windows 3.1, 95 & NT)

03-3156A01

03-1831A12 (Synchronous)

MODEL NUMBER CODES BANDWIDTH (1) 12.5 kHz

The radio model number is printed on the serial number tag, which is located on the end of the radio enclosure. Figure 2 illustrates the significance of the model number characters.

23 1 0R A 1

DIAGNOSTICS (Ø) None (4) Remote Maintenance

REGULATORY CERT. (Ø) N/A† (1) FCC (USA)* (3) IC (CANADA)* * Only w/"NA" Safety Cert. † Not Valid w/"NA" Safety Cert.

1 1 MOUNTING BRACKETS (A) Standard (B) None

OPERATION (R) Remote

PRIMARY POWER (1) 12 VDC

INTERFACE—ANALOG SEPARATION (1) 24/31 MHz (0) 4-Wire Audio (2) 9/24/31 MHz (1) VOX (S) Simplex (2) 1200 BPS (B) 4800 BPS Async. (C) 4800 BPS Sync. (D) 9600 BPS Sync./Async.

CERTIFICATION (Ø) N/A (F) Factory Mutual/UL (P) Panhandle

Figure 2. Model Number Codes 2

Installation & Operation Guide

MDS 05-2900A01, Rev. B

TRANSCEIVER SPECIFICATIONS GENERAL Frequency Stability:

± 0.00015% (1.5 PPM)

Temperature Range:

Ð30°C to +60°C

Humidity:

95% at + 40°C; Non-Condensing

Primary Power:

13.8 Vdc Nominal (10.5Ð16 Vdc operating range)

Supply Current:

Transmit: 1.8 A typical @ 5 watts Receive: 80 mA maximum Standby (sleep mode): 3 mA, 7 mA w/modem installed

Interface:

EIA/TIA-232 (formerly RS-232) DCE configuration

Data Rates:

AFSK: 300 to 9600 bps, asynchronous w/4-wire audio interface using external modems. 30 to 1200 bps, asynchronous w/internal Bell 202T compatible modem FSK: 300 to 4800 bps, async, 4800 bps synchronous, w/internal direct FSK interface. 9600 bps async/synchronous, w/internal direct FSK interface

Dimensions:

2.0" x 5.62" x 7.25" 51 x 143 x 184 mm (Excluding mounting hardware)

Weight:

3.5 lb./1.6 kg with all options installed

Approvals:

FCC (USA): Industry Canada:

Part 94 RSS-119, 1241 B274 RSS-122, 1241 B271

( MDS for information on availability and governmental approvals in other countries) TRANSMITTER Frequency Range:

914Ð939 MHz

Power Output: (at ANTENNA connector):

SelectableÑLO: nominal 0.5 watt/ +27 dBm HI: nominal 5 watts/+37 dBm (adjustable)

Duty Cycle:

100%; Continuous

Modulation Type:

Digital models: FSK, ±2.5 kHz maximum Analog models: FM, ±2.5 kHz maximum

Output Impedance:

50 Ohms

Bandwidth Compatibility:

12.5 kHz

Time-Out Timer:

Internal; Programmable from 1 to 255 seconds, or Off

RECEIVER Frequency Range:

937Ð960 MHz

Type:

Double conversion superheterodyne

Intermodulation:

75 dB minimum (EIA)

Squelch Opening Time:

2 ms typical

Audio Frequency Response (Ref. to 1 kHz):

Filtered, +1, Ð3 dB, 300Ð3000 Hz

Audio Output:

Adjustable, Ð20 to 0 dBm

Bit-Error Rates (BER)

1200 bps (Analog/AFSK): 1 x 10Ð6 at Ð110 dBm 4800 bps (Digital/FSK) 1 x 10Ð6 at Ð110 dBm 9600 bps (Digital/FSK) 1 x 10Ð6 at Ð108 dBm

MDS 05-2900A01, Rev. B

Installation & Operation Guide

3

INSTALLATION UNPACKING & INSPECTION (See Figure 3)

R S -2 3 2

C O N V E R T E R

R S -2 3 2 /R S -4 2 2

CONVERTER PLUG (OPTIONAL)

P /N

R S -4 2 2

13.8 VDC POWER CABLE

0 1 -2 3 5 8 A 0 1 , R E V A

Check the contents against the packing list secured to the outside of the shipping box. Accessories and spare parts kits, if any, are wrapped separately. Inspect these items for signs of damage. Save all packing materials for possible re-shipment. ORDER WIRE ADAPTOR MODULE (OPTIONAL)

ORDER WIRE MODULE M ale connector Fem ale connector

Radio RTU

F5

E

F4

9

S

7

L Q

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P

W ES

V U CT

Y X

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IF

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.

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INSTALLATION & OPERATION GUIDE

O N

4

G

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5

H

(

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6

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1

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*

J

2

C

F2 F1

3

D

F3

AC

TE

R

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P

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Z

HAND-HELD TERMINAL (OPTIONAL)

Figure 3. Transceiver, Instruction Guide, Power Cable and Optional Equipment Configuration Check In most cases, the transceiver requires no adjustment or configuration changes prior to installation. Check the final test data sheets packed with the radio to ensure that the unit has been set up to meet your particular system requirements. Key items to check include: modem speed (bps), receive and transmit frequencies, and any options that may be required. One item that may require setting is the configuration switch (S1) on either the modem or Audio Processing Module. If changes are required, refer to the appropriate sections near the end of this guide. (There is no configuration switch on 1200 bps modems.) INSTALLATION REQUIREMENTS There are three main requirements for installing the TransceiverÑadequate and stable primary power, a good antenna system, and the correct interface between the transceiver and the connected device. Figure 4 shows a typical station arrangement. Mounting the Transceiver Figure 5 shows the dimensions of the transceiver case and its mounting bracket. If possible, choose a mounting location that provides easy access to the connectors on the end of the radio and an unobstructed view of the LED status indicators. Note: As supplied, the MDS 2310A Transceiver can be used to directly replace an existing MDS 2300 Series transceiver installation. 4

Installation & Operation Guide

MDS 05-2900A01, Rev. B

REMOTE TERMINAL UNIT ANTENNA SYSTEM

RADIO TRANSCEIVER

13.8 VDC POWER CABLE

LOW-LOSS FEEDLINE

13.8 VDC 2.5 A (MIN.) POWER SUPPLY

Figure 4. Typical Station Arrangement Fasten the mounting brackets to the mounting surface with four 1Ú4 inch (6.35 mm) bolts or screws (not supplied). If the mounting surface is uneven, three screws may be used instead of four. Important: If the screws holding the brackets to the radio are ever removed, the replacement screws must not exceed 5Ú16 inch (8 mm) length to prevent damage to the radioÕs PC board.

AA A A A A AAAAAAAAAA A AA

AA AA A AA A

ALTERNATE POSITION

P W R

TX

C D

R TS

TX D

R X D

IN

1 .7 5 " 4 .4 4 C M

D C

IN T E R F A C E

2.75" 70 MM

2.0" 50 MM

2.25" 57 MM

A N T E N N A

7.25" 184 MM

5.625" 143 MM

6.75" 171 MM 8.5" 216 MM

Figure 5. Transceiver Mounting Dimensions

MDS 05-2900A01, Rev. B

Installation & Operation Guide

5

Power Requirements The radio can be powered from any well filtered +13.8 Vdc (nominal) power source connected to J2 on the transceiver housing. The power supply must be capable of supplying a minimum of 2.5 amperes. Under no circumstances should the power supply voltage drop below 10.5 volts or rise above 16 volts or the power output level and reliability of the radio will be affected. The radio is protected by an internal plug-in fuse (3 ampere) located on the transceiver PC board. It is also recommended that the power supply be equipped with overload protection, to protect against a short circuit between its output terminals and the transceiver power connector. A two conductor power cable and plug are provided with the transceiver. Observe proper polarity when connecting the power. The red wire is the positive lead. Antenna System Selection The single most important item influencing system effectiveness is the antenna system. A high quality gain antenna of 50 ohms impedance should be used with the transceiver. A directional Yagi or corner reflector antenna will serve this purpose well and has the added benefit of minimizing interference to and from nearby systems. Directional antennas are available from a number of manufacturers as shown in Table 2. Table 2. Suitable Antenna Types MANUFACTURER

MODEL NUMBER

Scala

TY-900

DB Products

DB 498-K

Celwave

PD 1612

Telewave

ANT940Y10-WR

The choice of feedline used with the antenna must be carefully considered. Poor quality coaxial cables should be avoided as they will seriously degrade system performance for both transmission and reception of radio signals. Table 3 lists several types of acceptable feedlines and indicates the signal losses (in dB) that result when using various lengths of each cable. Regardless of the feedline used, it must be kept as short as possible to minimize signal loss. Connectors used with the feedline must be installed in accordance with the manufacturerÕs instructions for the particular connector used. Follow the manufacturerÕs recommendations for weatherproofing connectors that will be installed outdoors. When installing the feedline, take care to prevent damage due to kinking, twisting or excessive stretching of the cable. After installation, fasten the cable securely to the antenna tower or other ing structure. Table 3. Length vs. Loss in Coaxial Cables at 960 MHz 10 Feet (3.05 Meters)

50 Feet (15.24 Meters)

100 Feet (30.48 Meters)

500 Feet (152.4 Meters)

RG-8A/U

0.85 dB

4.27 dB

8.54 dB

42.70 dB

1

Ú2 inch HELIAX

0.23 dB

1.15 dB

2.29 dB

11.45 dB

7

Ú8 inch HELIAX

0.13 dB

0.64 dB

1.28 dB

6.40 dB

1 Ú4 inch HELIAX

0.10 dB

0.48 dB

0.95 dB

4.75 dB

15Ú8 inch HELIAX

0.08 dB

0.40 dB

0.80 dB

4.00 dB

Cable Type

1

6

Installation & Operation Guide

MDS 05-2900A01, Rev. B

Antenna Mounting The antenna manufacturerÕs installation instructions must be strictly followed for proper operation of the antenna. Using the proper mounting hardware and bracket ensures a secure mounting arrangement with no pattern distortion or detuning of the antenna. The following recommendations apply to all antenna installations: 1. 2.

Mount the antenna in the clear, as far away as possible from obstructions such as buildings, metal objects, dense foliage, etc. Choose a location that provides a clear path in the direction of the master station. Polarization of the antenna is important. Most systems using a gain type omnidirectional antenna at the master station employ vertical polarization of the signal; therefore, the remote antenna must also be vertically polarized (elements oriented perpendicular to the horizon). If the wrong polarization is used, a signal reduction of 20 dB or more will result. CAUTION Strong fields near the antenna can interfere with the operation of the low level RTU circuits and change the reported values of the data being monitored. For this reason, the antenna must be mounted at least 10 feet (»3 meters) from the radio, RTU, sensors and other components of the system.

Antenna Aiming For optimum performance, a directional antenna must be aimed in the direction of the master station. The easiest way to do this is to point the antenna in the approximate direction, then use the transceiverÕs built-in Received Signal Strength Indication (RSSI) feature to further refine the heading. Slowly rotate the antenna until a maximum RSSI reading is obtained. There are two ways to read the RSSI. If the radio is equipped with the Remote Maintenance Option, you can use the RSSI command with the Hand-Held Terminal (HHT). For instructions on connecting and using the HHT, refer to the Operation section of this guide. The RSSI can also be read by connecting a DC voltmeter to Pin 21 of the transceiverÕs INTERFACE connector. The voltage level on this pin will vary with the strength of the incoming signal. Figure 6 shows a graph plotting the typical RSSI voltage vs. received signal strength. 5.0 4.5

Figure 6. RSSI Voltage vs. Signal Strength in dBm (Typical)

DC VOLTS +

4 3.5 3 2.5 2 1.5 0 –4

0 –6

0 –8

00 –1

–1 20

–1 40

1

SIGNAL LEVEL (dBm)

MDS 05-2900A01, Rev. B

Installation & Operation Guide

7

SWR Check The SWR of the antenna system should be checked before the radio is put into regular service. For accurate readings, a wattmeter suited for 1000 MHz and 10 watts must be used. One unit meeting this criteria is the Bird model 43 directional wattmeter with a 10E element installed. The reflected power reading should be less than 10% of the forward power reading. Higher readings may indicate problems with the antenna or feedline. If the reading is high, check all connections and ensure that the cable connectors are installed properly. Make sure the antenna is not damaged, and is the correct model for this frequency band. INTERFACE CONNECTIONS The transceiverÕs INTERFACE connector, J1, is used to connect the transceiver to an external DTE data terminal that s the RS-232 format. (RS-422 and TTL signaling can be accommodated with an external adapter plugÑsee Table 1.) The INTERFACE connector mates with a standard DB-25 plug that is available from many electronics parts distributors. Table 4 lists each pin on the INTERFACE connector and describes its function. The cabling between the transceiver and the connected device must be kept as short as possible. (Cable runs over 50 feet/15 meters may require the use of RS-422 signaling. Consult the factory for details.) CAUTION Do not use a 25 wire (fully pinned) interface cable for connection to the INTERFACE connector. Use only the required pins for the application. Typical applications require the use of only Pins 1 through 5 for RS-232 signaling. (Pins 6 and 8 may be required for use with some RTUs.) When using an external modem (4-wire audio arrangement), only Pins 7, 9, 11 and 16 are typically required.

Table 4. J1 Interface Connector Pinouts 13

25

1

14

As viewed from outside the radio PIN NUMBER

8

INPUT/ OUTPUT

PIN DESCRIPTION

1

--

Protective Ground. Connects to ground (negative supply potential) on the radioÕs PC board.

2

IN

TXDÑTransmitted Data. Accepts TX data from the connected device. This pin is used only with an internal modem.

3

OUT

4

IN

5

OUT

RXDÑReceived Data. Outputs received data to the connected device. RTSÑRequest-to-Send Input. Keys the transmitter when RTS is at logic high. CTSÑClear-to-Send Output. Goes ÒhighÓ after the programmed CTS delay time has elapsed.

Installation & Operation Guide

MDS 05-2900A01, Rev. B

Table 4. Interface Connection Pinouts (Continued) PIN NUMBER

INPUT/ OUTPUT

6

OUT

7

--

8

OUT

9

IN

10

OUT

RUSÑReceiver Unsquelched Sensor. Not used in most installations, but is available as a convenience. Provides +8 Vdc through a 1 kW resistor whenever the receiver squelch is open, and drops to less than 1 Vdc when the squelch is closed.

11

OUT

Receive Audio Output. Connects to the audio input of an external modem. The output impedance is 600 W and the level is factory set to suit most installations. If the distance to the modem exceeds five feet, use of a twisted pair of wires or shielded cable is recommended. (Pin 7 of the radioÕs INTERFACE connector should be connected to the modem's return lead.)

12

IN

Radio Inhibit. A ground on this pin places the radio into sleep mode. It turns off most circuits in the radio, including transmit, receive, modem and diagnostic functions. This allows for greatly reduced power consumption (7 mA maximum), yet preserves the radioÕs ability to be quickly brought online.

13

--

Do not connect.ÑReserved for Future use.

14

IN

PTTÑTransmitter Keying. This is one of three transmitter keying inputs. The PTT input is normally at ground. When pulled up to greater than 4 volts, the transmitter keys. When the pin is at less than one volt (or open circuit), the transmitter is off and the receiver is active. See also Pin 16 description.

15

OUT

16

IN

PTT "Not PTT" This input acts in the opposite way from Pin 14. It is normally at 5 Vdc. When it is pulled down to less than one volt, the transmitter keys. When it is greater than three volts, the transmitter is off.

17

OUT

RCÑReceive Clock Used only on systems requiring a synchronous interface. This pin provides a clock signal to clock receive data bits from the radio to the connected device.

18

OUT

+13.8 Vdc Unregulated Output. Provides a source of unregulated 13.8 Vdc at 0.05A (50 mA) for powering low current accessories. Excessive drain on this connection will blow fuse F1 on the transceiver PC board.

19

OUT

+8 Vdc Regulated Output. Provides a source of regulated 8 Vdc at 10 mA for low power accessories.

20

--

21

OUT

RSSIÑReceived Signal Strength Indication. A DC voltmeter may be connected to this pin to read the relative strength of the incoming signal. It is helpful for aiming the station antenna for maximum signal pickup. See Figure 6 to interpret the DC reading.

22

IN

Loopback Test Input. A direct input to the Remote Maintenance ModuleÕs DTMF decoder. May be used with an external DTMF encoder to simulate a polling request from a master station. Nominal input level is Ð10 dBm.

23

IN

Diagnostic Channel Enable. A ground on this pin causes the radioÕs microcontroller to open the data interface for diagnostics and control.

24

OUT

ETCÑExternal Transmit Clock Output. Used only on applications requiring a synchronous interface where the DTE device provides the clocking signal. The ETC signal is compatible only with RS-232 devices.

25

OUT

Out-of-Lock Alarm. A logic low (less than 0.5 volts) on this pin indicates normal operation. A logic high (greater than 4 volts) indicates a failure in the main phase lock loop or TCXO which also shuts down the transmitter and receiver. This pin can be used as an alarm output, provided the internal series resistance of 1 kW is considered.

PIN DESCRIPTION DSRÑData Set Ready. Provides a +8 Vdc DSR signal through a 1 kW resistor. Signal Ground. Connects to ground (negative supply potential) at radioÕs PC board. DCDÑData Carrier Detect. Goes ÒhighÓ when the modem detects a data carrier from the master station. Transmit Audio Input. Connects to the audio output of an external modem. The input impedance is 600 W and the level is factory set to Ð10 dBm for 2.5 kHz modulation. If the distance to the modem exceeds five feet (1.52 meters), the use of a twisted pair of wires or shielded cable is recommended. (Pin 7 of the radioÕs INTERFACE connector should be connected to the modemÕs return lead.)

TCÑTransmit Clock. Used only on applications requiring a synchronous interface. This pin provides a signal to clock transmit data bits out of the device connected to the radio.

Do not connect.ÑReserved for Future use.

MDS 05-2900A01, Rev. B

Installation & Operation Guide

9

OPERATION INITIAL STARTUP The radio is ready for operation as soon as power is applied. Proper in-service operation can be verified by observing the LED status located on the end of the radio enclosure. (The will not light if the LEDs have been disabledÑSee Table 6 to restore LED operation.) The status LEDs provide key information on radio functions. In typical operation, the PWR lamp will be lit at all times and the radio will be transmitting data in response to polling requests from the master station. Table 5 describes the function of each status LED. Table 5. LED Status Indicators PWR TX C D

RTS TXD RXD

LED

FUNCTION

INDICATION

PWR

Power

Power is applied to the radio.

TX

Transmit

Radio transmitter keyed. Normally lights when the radio is transmitting.

CD

Carrier Detect

Lights when carrier signal from master station is detected.

TXD

Transmit Data

Indicates status of the Transmit Data line from the external device. (LED OFF = 0, LED ON = 1). Flashes with TX data flow.

RXD

Receive Data

Status of the Receive Data (RXD) line to the external device. (LED OFF = 0, LED ON = 1). Flashes with RX data flow.

RTS

Request-to- Send

Lights when the connected device has issued a request to send data.

PROGRAMMING & CONTROL There are no operating controls on the outside of the transceiver. Option programming and most diagnostics are performed externally through the radioÕs INTERFACE connector with an MDS Hand-Held Terminal (MDS P/N 02-1501A01), or a personal computer running MDSÕ Transceiver Programming software (MDS P/N 02-1972Axx) version 2.6 or later. NOTE It is recommended that a dummy load be connected to the antenna connector during all transmit testing. This prevents accidental interference with other units in the system. Using a PC for Transceiver Control If you are using a personal computer with MDS Transceiver Programming software, disregard the instructions in this section. Simply connect your computerÕs serial port to the radioÕs INTERFACE connector and refer to the prompts and menus provided on the software disk. Hand-Held Terminal Connection & Startup This section gives basic information for connecting and using the MDS Hand-Held Terminal for transceiver control. For more information about the terminal, refer also to the Hand-Held Terminal Quick Reference Guide. This booklet (see Figure 7) is included with each HHT kit shipped from MDS. 10

Installation & Operation Guide

MDS 05-2900A01, Rev. B

Follow these steps to connect the HHT: 1. Disconnect the interface cable from the transceiverÕs INTERFACE connector and set it aside. 2. Connect the HHTÕs coiled cord to the radio as shown in Figure 8. This automatically switches the radio into the control and programming mode. (Note: Early style HHTÕs required manual opening of the diagnostics channel. If an older unit is being used, follow the opening instructions given in the HHT Quick Reference Guide.) 3. When the HHT is connected, a string of characters will briefly appear on the HHT screen as it runs through its self-check. When the check is complete, the message DIAGNOSTICS IS OPEN appears, indicating that the HHT is ready to accept the keyboard commands listed in Table 6.

Figure 7. The MDS Hand-Held Terminal Quick Reference Guide (MDS P/N 05-1502A01)

INT

ER

FA C

E

TR TD

MR IN

CD

13.8 +

AN VD

C –

TE

NN

A

RD

F5 F4 F3 F2 F1

D

C

B

A

6

7

=

W

V

U L

CTR

ESC

SH

IFT

●

0

,

+

T

S

R

Q

P

9

8

#

–

O

N

M

L

K

J 5

4

) *

I

H

G

F

3

2

1

(

/

E

Y

X

TER

E EN

C SPA

SP BK

Z

Figure 8. Hand-Held Terminal Connected to the Transceiver MDS 05-2900A01, Rev. B

Installation & Operation Guide

11

KEYBOARD COMMANDS Table 6 lists the HHT keyboard commands for the transceiver. Use this table instead of the command list in the Hand-Held Terminal Quick Reference Guide unless the revision level shown on the back of the reference guide is ÒRev. EÓ or later. (Although the commands are similar, earlier editions of the guide pertain only to the MDS 2310 transceiver.) The proper procedure for entering commands is the command, followed by an ENTER keystroke. For programming commands, the command is followed by a SPACE and the appropriate information or values, then ENTER . NOTE An underscore Ò_Ó symbol in Table 6 indicates a required keypress on the terminal.

SPACE

Table 6. Programming and Test CommandsÑPart 1 of 3 DISPLAY COMMANDSÑRead Only HARDWARE STATUS STAT ... Display status of hardware profile Displayed below are the functions of each display character and its meaning. 1

2

3

4

Keyed Status ................ U Ð Unkeyed K Ð Keyed T Ð Timed Out Diagnostic Mode .......... S Ð Standard (Mode 1) A Ð Advanced (Mode 2) R Ð Remote Maint. (Mode 3) Diagnostic Hardware ... A Ð Installed, LBC Valid B Ð Installed, LBC Invalid C Ð Uninstalled, LBC Valid D Ð Uninstalled, LBC Invalid Diagnostic Module ........ I Ð Installed U Ð Uninstalled

5 6

Base/Remote .............. B Ð Base R Ð Remote IF Frequency ............... 0 Ð 23 MHz

7

RSSI Cal. Status .......... Y Ð NÐ 8 RF Power Status .......... Y Ð NÐ 9 VCO Lock Status.......... Y Ð NÐ 10 Rem. Maintenance Baud Rate ............... 1 Ð 4Ð 9Ð

Calibrated Uncalibrated Calibrated Uncalibrated VCO in lock VCO Out-of-Lock 1200 bps 4800 bps 9600 bps

OWNERÕS INFORMATION OWM ... Display OwnerÕs Message

OWN .... Display OwnerÕs Name

RADIO INFORMATION HREV .. Transceiver hardware revision level MD....... Transceiver manufacture date MO ...... Model number of radio

SER...... Serial number of radio SREV ... Transceiver firmware revision level

OPERATING PARAMETERS CTS ..... Display CTS delay in ms FRQ .... Display frequencies currently set in MHz LBC ..... Display Loopback code (4 digits) STE...... Display Squelch Tail Eliminator (STE) StatusÑ ON or OFF (Normally OFF if VOX function is used. Must be OFF if 4800 or 9600 bps modem is used.)

TOT ...... Display Time-Out Timer length (in seconds) SCD ..... Display Soft Carrier Dekey in ms PTT ...... Display Push-to-Talk delay in ms LED ...... Display LED status PWR .... Display power level setting

DIAGNOSTIC INFORMATION FPWR ..... Forward RF power (radio must be keyed)* RPWR ..... Reflected RF power (radio must be keyed)* RSSI ........ Received Signal Strength Indicator* SV ........... Supply voltage to radio*

12

TEMP... Internal temperature in degrees Celsius* VR ........ Regulator voltage output »8 Vdc* VSWR .. Approximate SWR at ANTENNA connector (radio must be keyed)* * Information is updated every second Radio must be unkeyed

Installation & Operation Guide

MDS 05-2900A01, Rev. B

Table 6. Programming and Test CommandsÑPart 2 of 3 DIAGNOSTIC AND TEST MODES TEST MODES KEY .......... Keys the transmitter (Transmit modulation enabled) DKEY ........Dekeys the transmitter TEST_1 .... Keys the transmitter and enables a constant DTMF Loopback test tone. Useful for checking the radioÕs diagnostic deviation level

TEST_2 .... Disables DTMF Loopback test tone and unkeys the transmitter. TEST_7 .... Turns on modem test tones and keys the transmitter for 12 seconds. With 4800/9600 bps modem: Sinewave at one half the data rate.

DIAGNOSTIC MODES MODE_1 ... Enable-Standard Diagnostics MODE_2 ... Enable-Advanced Diagnostics MODE_3_xxxx Enable Remote Maintenance Functions (xxxx is the data rate in bps)

NOTESÐ Remote Maintenance Module (03-1958A01) must be installed to use these functions. 4-wire radios in Mode 3 must use 1200 as the modem data rate.

DIAGNOSTIC CALIBRATION Diagnostic calibration is factory set and the need for field adjustment is rare. If adjustment is necessary, see Technical Manual for alignment details. These commands must only be used with calibrated test equipment connected to the radio. WR ...... Calibrate forward power to 5 Watts for diagnostics RSSL ........Calibrate RSSI at Ð110 dBm

RSSH... Calibrate RSSI at Ð70 dBm

SET/PROGRAM COMMANDS OPERATING PARAMETERS _xxxx ...... Entry PTX_xxx.xxxx... Program transmit frequency PRX_xxx.xxxx .. Program receive frequency PLBC_xxxx....... Program loopback code (0000Ð9999) ESTE ................ Enable Squelch Tail Eliminator DSTE................ Disable Squelch Tail Eliminator PCTS_xxx ....... Program CTS Delay in ms; 2-255 ms, no leading zeros (1Ð3 digits)

PSCD_xxx ....... Program soft carrier dekey; 2Ð255 ms, no leading zeros (1Ð3 digits) ETOT .............. Enable Time-out Timer DTOT .............. Disable Time-out Timer PTOT_xxx ........ Program Time-out timer (sec) (1Ð3 digits) PPTT_xx .......... Program Push-to-talk delay (0-31 ms) LED_ON ........... Enables front LEDs LED_OFF ......... Disables front LEDs

A move of more than 6 MHz requires realignment of the receiver helical filters. See Technical Manual for details.

POWER, FREQUENCY AND DEVIATION Except for the RF Power Output setting, a Remote Maintenance Module (P/N 03-1958A01) must be installed in the transceiver and the transceiver must be set to Mode 3 Diagnostics for these commands to have any effect. Electronic controls (EEPOTs) for these parameters are incremented or decremented as a percentage of their maximum valueÑzero to 100 percent. Changes in these settings are not stored in the transceiver until the RMST command is sent. GENERAL: RMRD .............. Read present EEPOT settings RMST ............... Store present EEPOT settings RMIS ................ Reset all EEPOTs to 50% and store settings RMOV .............. Restore all EEPOTs to the previously stored settings <SPACE> ........ Repeat last adjustment command RF POWER OUTPUT: PWR_LO .......... Sets radio to low power (nominal 0.5 W) PWR_HI ........... Sets radio to high power (nominal 5 W, adjustable with internal pot. R305)

FREQUENCY: IF ...................... Increment Frequency by 1 DF .................... Decrement Frequency by 1 INCF_xx ........... Increment Frequency by xx value DECF_xx.......... Decrement Frequency by xx value DEVIATION: ID ..................... Increment Deviation by 1 DD .................... Decrement Deviation by 1 INCD_xx ........... Increment Deviation by xx value DECD_xx ......... Decrement Deviation by xx value

OWNERÕS INFORMATION POWN_xxxxx ....... Program ownerÕs name (20 characters maximum)

MDS 05-2900A01, Rev. B

POWM_xxxxx ...... Program ownerÕs message (27 characters maximum)

Installation & Operation Guide

13

Table 6. Programming and Test CommandsÑPart 3 of 3 GENERAL REMINDERS ¥ ¥ ¥ ¥ ¥ ¥

All command entries end with the ENTER key. Use the SHIFT key to access numbers; press again to return to letter mode. Flashing square cursor ( ) on HHT Ð letter mode is selected. Flashing rectangular cursor ( ) on HHT Ð number mode is selected. Use ESC/BKSP key to edit information or commands being typed in. An underlined blank space (xx_xx) on command list indicates a required SPACE keypress.

¥ Below are some of the most common error messages likely to be encountered when using the HHT: INCORRECT ENTRYÑData was entered in a wrong format, or wrong number of digits. COMMAND ENTRY ERRORÑCommand improperly entered, or an invalid command was tried. INCORRECT FREQUENCY ENTRYÑLast digit of frequency was omitted, or frequency entered was out of range. DIAGNOSTICS NOT INSTALLEDÑRemote Maintenance Module not installed or not read by the microcontroller.

TROUBLESHOOTING Table 7 provides suggestions for resolving some common system troubles. Also included in this section is an internal view of the transceiver (Figure 9) and a block diagram of the transceiver circuits (Figure 10). Table 7. Troubleshooting Chart DIFFICULTY

RECOMMENDED SYSTEM CHECKS

Unit appears to be inoperative.

a. Check for DC power at the power connector (Nominal 13.8 Vdc). b. Status LEDs may be disabledÑsee Table 6 to restore LED operation. c. Check internal plug-in fuse (F1). If defective, replace with 3 Ampere automotive-type blade fuse. (Littelfuse¨ No. 257 003 or equivalent.) See Figure 9 for location of the fuse.

Unit receives, but does not a. Check antenna, feedline and connectors. Reflected power should be less than 10% of the transmit (or transmits poorly). forward power reading. b. Check the transmitter for proper power settingÑsee Table 6. Also, measure power output at the ANTENNA connector with an inline wattmeter. c. Check for proper transmit frequency programming. d. Check VCO lock status (STAT on HHT) or measure voltage at Pin 25 (see Table 4). e. Check for proper DC voltage at the power connector with the transceiver keyed. The voltage should not drop more than 0.4 volt when the radio is keyed. Unit transmits, but does not receive (or receives poorly).

a. Check antenna, feedline and connectors. b. Check for proper receive frequency programming. c. Check received signal strength using RSSI command on HHT (if Remote Maintenance Board is installed) or with a DC voltmeter at Pin 21 of INTERFACE connector. See Figure 6 to interpret DC reading. d. Check that radio is not continuously keyed (observe TX LED on radio).

Unit receives and transmits, but overall performance is poor.

a. Check antenna, feedline and connectors. Reflected power should be less than 10% of the forward power reading. b. Check for secure interface connections at the transceiver and the connected device. c. Check received signal strength using RSSI command on HHT (if Remote Maintenance Board is installed) or with a DC voltmeter at Pin 21 of INTERFACE connector. See Figure 6 to interpret DC reading. d. Check for proper frequency programming. e. Check the transmitter for proper power settingÑsee Table 6. Also, measure power output at the ANTENNA connector with an inline wattmeter. f.

14

Check for proper CTS and SCD delay settings using HHT.

Installation & Operation Guide

MDS 05-2900A01, Rev. B

TOP COVER

COVER SCREWS

OPTION 1— MODEM OR AUDIO PROCESSING MODULE OPTION 2— REMOTE MAINTENANCE MODULE

TRANSCEIVER PC BOARD

PTT - S1

FUSE F1, 3A BLADE TYPE BOTTOM COVER

DB-25 INTERFACE CONNECTOR LED STATUS DISPLAY DC POWER INPUT

ANTENNA CONNECTOR

DETACHABLE & ADJUSTABLE MOUNTING BRACKETS (2)

Figure 9. Location of Fuse F1 and Other Major Components

MDS 05-2900A01, Rev. B

Installation & Operation Guide

15

16

Installation & Operation Guide

HI PWR. ADJ. R305

ANTENNA

RX INPUT 952 MHZ

RF AMP

2 dB Noise Figure 15 db Gain

POWER CONTROL LOOP

DIRECTIONAL COUPLER

HELICAL FILTER BW = 20 MHZ

TX POWER AMPLIFIER

929 MHZ

HELICAL FILTER BW = 6 MHZ

VCO

23 MHZ

PLL

IF AMP

HF AUDIO COMPENSATION

XTAL FILTER BW = 15 KHZ

TCXO 22.55 MHZ

FREQUENCY T3

RSSI ADJ.

CERAMIC FILTERS BW = 10 KHZ

NOISE FILTER

SQUELCH GATE

DEVIATION

AA AA

Figure 10. Transceiver Block Diagram

MDS 05-2900A01, Rev. B

SQUELCH CIRCUIT (Noise Detector)

RX AUDIO

TX AUDIO (From internal modem)

TX AUDIO IN (J1-9)

RSSI OUT (J1-21)

RX AUDIO OUT (J1-11)

RX AUDIO (To modem and Diagnostics PCBs)

MODEM SWITCH SETTINGS MDS 4800 and 9600 bps modems contain an eight section switch, S1, used to configure the modems for a variety of operating conditions. In most cases, these switches will not require changes when installing the transceiver. (MDS 1200 bps modems do not contain a configuration switch, and should not require any field adjustments for proper operation.) Table 8 lists the standard switch settings for all types of MDS 4800 and 9600 bps modems. In this chart, ÒCÓ = Closed and ÒOÓ = Open. Figure 11 shows the location of modem configuration switch S1. Table 8. 4800/9600 BPS Modem Switch Settings ASYNC. 4800 BPS MODEM 03-1831A11

8

These are the only permissible switch settings O for this modem.

7

MODEM SWITCHES 6 5 4 3

2

1

O

O

O

C

O

C

C

SYNC. 4800 BPS MODEM 03-1831A12 Synchronous w/internal clock (Default)

O

O

O

O

O

O

O

O

Synchronous w/external clock

O

O

O

O

O

O

C

O

Synchronize on transmit data

O

O

O

O

C

O

O

O

Asynchronous 8 bit*

O

O

C

O

O

O

O

C

Asynchronous 9 bit*

C

O

C

O

O

O

O

C

Asynchronous 10 bit* (Default)

O

C

C

O

O

O

O

C

Asynchronous 11 bit*

C

C

C

O

O

O

O

C

Synchronous w/internal clock

O

O

O

O

O

O

O

C

Synchronous w/external clock

O

O

O

O

O

O

C

C

Synchronize on transmit data

O

O

O

O

C

O

O

C

9600 BPS MODEM 03-1833A01

LEGEND: C = CLOSED = ON

O = OPEN = OFF

* The number of bits includes start bits, stop bits, data bits and parity bits.

8 ON (CLOSED)

1

OFF (OPEN)

Switch S1

U6 U5

P8

P6

Figure 11. Configuration Switch Location of the Modem 4800 & 9600 bps Modems

MDS 05-2900A01, Rev. B

Installation & Operation Guide

17

AUDIO PROCESSING MODULE SWITCH SETTINGS INTRODUCTION The Audio Processing Module (P/N 03-1912A01) senses the presence of an audio tone on the transmit audio line and, in turn, keys the transmitter. The module is mounted in the Option 1 position on the transceiverÕs motherboard. (See Figure 9.) Key-up Time: Less than 2 milliseconds; 0.25 ms typical Release Time: Less than 10 milliseconds; 5 ms typical CONFIGURATION Table 9 lists various functions of the DIP switch on the PC board. See Figure 12 for the location of SW1. The configuration chosen for some functions, such as the filtered/flat response will depend on the specific requirements of your system. If technical assistance is required, Microwave Data Systems, Systems Engineering Department. Table 9. Configuration Switch Settings SWITCH POSITION FUNCTION

SW1

OFF

ON

VOX Control

A

No VOX*

VOX

Filtered/Flat RX Audio

B

Filtered

Flat*

De-Emphasis ON/OFF

C

No De-Emphasis*

De-Emphasis

Pre-Emphasis

D

No Pre-Emphasis*

Pre-Emphasis

Not Used

E

Leave OFF*

Ñ

Not Used

F

Leave OFF*

Ñ

TX Audio Filter

G

Filtered

Flat*

Audio Processor

H

No Processing

Processing*

* Factory default settings

NOTE When the VOX Function is used, the Squelch Tail Eliminator (STE) circuitry should be turned off. The status of this operating parameter can be checked, and if necessary set to OFF, using the Hand-Held Terminal (HHT). See Table 3-1 Programming & Test Commands for instructions. S1 CONFIGURATION ON A H

Figure 12. Configuration Switch Location on the Audio Processing Module 18

Installation & Operation Guide

MDS 05-2900A01, Rev. B

IN CASE OF DIFFICULTY... MDS products are designed for long life and trouble-free operation. However, this equipment, as with all electronic equipment may have an occasional component failure. The following information will assist you in the event that servicing becomes necessary.

FACTORY TECHNICAL ASSISTANCE Technical assistance for MDS products is available from our Customer Team during business hours (8:00 A.M.–5:30 P.M. Eastern Time). When calling, please give the complete model number of the radio, along with a description of the trouble symptom(s) that you are experiencing. In many cases, problems can be resolved over the telephone, without the need for returning the unit to the factory. Please use the following telephone numbers for product assistance: 716-242-9600 (Phone) 716-242-9620 (FAX)

FACTORY REPAIRS Component level repair of radio equipment is not recommended in the field. Many components are installed using surface mount technology, which requires specialized training and equipment for proper servicing. For this reason, the equipment should be returned to the factory for any PC board repairs. The factory is best equipped to diagnose, repair and align your radio to its proper operating specifications. If return of the equipment is necessary, you will be issued a Returned Material Authorization (RMA) number. The RMA number will help expedite the repair so that the equipment can be repaired and returned to you as quickly as possible. Please be sure to include the RMA number on the outside of the shipping box, and on any correspondence relating to the repair. No equipment will be accepted for repair without an RMA number. A statement should accompany the radio describing, in detail, the trouble symptom(s), and a description of any associated equipment normally connected to the radio. It is also important to include the name and telephone number of a person in your organization who can be ed if additional information is required. The radio must be properly packed for return to the factory. The original shipping container and packaging materials should be used whenever possible. All factory returns should be addressed to: Microwave Data Systems Customer Service Department (RMA No. XXXX) 175 Science Parkway Rochester, NY 14620 USA When repairs have been completed, the equipment will be returned to you by the same shipping method used to send it to the factory. Please specify if you wish to make different shipping arrangements.

175 Science Parkway Rochester, N.Y. 14620, USA General Business: +1 (716) 242-9600 FAX: +1 (716) 242-9620 Internet: [email protected] World Wide Web: http://www.mdsroc.com/