RELM Communications SRU50ABC Repeater User Manual manual

RELM Communications Inc Repeater manual

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1/98RELM Communications, IncSR35/50 RF Transceiver/RepeaterUSER MANUALRELM Communications, Inc7505 Technology DriveW. Melbourne, Florida 32904Voice: 407- 984-1414Fax: 407-984-0434
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.02Manual Revision 1.0 January 1998Applicable reference:Micro Controller Board Rev CIn order to continually improve our products, RELM Communications, Inc reserves the right to alter, without noticeand at any time, the equipment and specifications described in this document.All performance figures quoted are typical and are subject to normal manufacturing and service tolerances.The purchaser is warned that statements made in this document may be inaccurate due to typographical or othererrors or subsequent modifications of the product. While every care has been taken in the creation of this document,no warranty of accuracy or reliability is given in any advice or information contained in this document. Theresponsibility for any loss or damage whatsoever arising in any way or any representation, act or omission whetherexpress or implied (including responsibility to any person by reason of negligence) is not accepted by RELMCommunications, Inc or any officer, agent or employee of RELM Communications Inc.Copyright © RELM Communications, Inc.
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.0 3Record Of ChangesAny changes to this manual are recorded on this list.Date Manual Version Chapter Changes Pages ChangedJan 1998 1.0 All - Initial Release All
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.04SAFETY SUMMARYAlthough there are no dangerous mains voltages present within theequipment, the following general safety precautions as would normallyapply, should be observed during all phases of operation, service andrepair of this equipment.AROUND THE EQUIPMENT.To minimize any possible shock hazard from an external power supply or lightning strike,the chassis or equipment cabinet must be connected to an electrical ground. Provideadequate ventilation around the rear of the equipment.DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE.Do not operate the equipment in the presence of flammable gases or fumes. Operationof any electrical equipment in such an environment constitutes a definite safety hazard.DO NOT ATTEMPT INTERNAL SERVICE WHILE TRANSMITTING.Thermal or RF burns may result from touching certain components within the poweramplifier module while transmitting or operating the transmitter.DO NOT SUBSTITUTE PARTS OR MODIFY THE EQUIPMENT.Because of the danger of introducing additional hazards, do not install substitute or lowervoltage parts to the equipment. Return to your authorized distributor.EXERCISE CAUTION AND CORRECT DISPOSAL OF RF POWER DEVICES.Most RF power transistors and some RF power hybrids contain Beryllium Oxide.Although they are normally safe, if physically damaged toxic dust may be released.Consult your local authority for correct disposal thereof.
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.0 5ContentsCONTENTS...........................................................................................................................................................5INTRODUCTION.................................................................................................................................................7GENERAL DESCRIPTION ...........................................................................................................................................7Exciter Module Description ..............................................................................................................................7Receiver Module Description............................................................................................................................8Power Amplifier Module Description................................................................................................................8KEY FEATURES AND ADVANTAGES..........................................................................................................................8INDICATORS AND CONNECTORS...............................................................................................................................9Standard Version front panel ............................................................................................................................9OEM Version front panel ..................................................................................................................................9Rear Panel Connectors ...................................................................................................................................11REAR VIEW SR35/50..............................................................................................................................................11SIDE VIEW SR35/50 ...............................................................................................................................................12INSTALLATION................................................................................................................................................12TECHNICAL DESCRIPTION..........................................................................................................................13INTERNAL CONNECTIONS.......................................................................................................................................13EXCITER MODULE TECHNICAL DESCRIPTION.........................................................................................................14RECEIVER MODULE TECHNICAL DESCRIPTION ......................................................................................................14PA MODULE TECHNICAL DESCRIPTION .................................................................................................................14MICRO CONTROLLER CONFIGURATION ..................................................................................................................15Description of Micro Controller Jumper functions.........................................................................................16TESTING.............................................................................................................................................................17CONNECTING A COMPUTER TO THE SR35/50 RADIO...............................................................................................17TEST SETUP ...........................................................................................................................................................17TEST PROCEDURE..................................................................................................................................................18SR35/50 BASE STATION UTILITY ................................................................................................................18INITIAL SETUP AND DESCRIPTION..........................................................................................................................18Main Display Tool Bar Description................................................................................................................18Initial Settings .................................................................................................................................................18Initial Static Settings .......................................................................................................................................18Channel Programming and Description .........................................................................................................18QUICK FREQUENCY PROGRAMMING..........................................................................................................19FULL CALIBRATION.........................................................................................................................................19DESCRIPTION OF PROGRAM FUNCTIONS.................................................................................................................20Synthesizer Control .........................................................................................................................................20Modulation Control.........................................................................................................................................21Transmit RF Power Output .............................................................................................................................21CTCSS Control................................................................................................................................................21Channel selection ............................................................................................................................................21TROUBLESHOOTING .....................................................................................................................................22GLOSSARY.........................................................................................................................................................22
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.06APPENDIX A SPECIFICATIONS ...................................................................................................................24MINIMUM PERFORMANCE SPECIFICATION..............................................................................................................24GENERAL SPECIFICATIONS.....................................................................................................................................24TRANSMITTER MODULE SPECIFICATIONS...............................................................................................................25RECEIVER MODULE SPECIFICATIONS .....................................................................................................................26ANCILLARIES .........................................................................................................................................................26APPENDIX B INTERFACE CONNECTIONS................................................................................................27SR35/50 REAR CHASSIS CONNECTOR DESCRIPTION..............................................................................................27Universal DB15 Analog I/O............................................................................................................................27DB25 Digital I/O Connector ...........................................................................................................................29PC SERIAL PORT TO RADIO CABLE ........................................................................................................................29APPENDIX C DIP SWITCH SETTINGS ........................................................................................................30DIP SWITCH 1 CHANNEL SELECTION.....................................................................................................................30DIP SWITCH 2 USER FUNCTION SELECT................................................................................................................36APPENDIX D MODEL # CONFIGURATION GUIDE..................................................................................37
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.0 7IntroductionThe SR35/50 series of radio systems employ state of the art design and construction methods to deliver a range ofhigh performance, ultra reliable radio devices. They are ideally suited for use in VHF or UHF two way voice radiosystems, however the SR35/50 can perform any number of applications where the added advantage of linearfrequency and phase response from DC to 5KHz can be utilized. The SR35/50, unlike conventional PLL radiosystems, uses a two point modulation method synthesizer for extended low end VF transmit frequency response.The flexibility of the SR35/50 series allows them to be configured for a wide range of applications, including;• Standard or wideband voice, full duplex radio.• Cellular or Trunking systems.• POCSAG paging transmitter.• Direct FSK modulation.• 2 or 4 level FSK transmissions.• Other paging formats.• Cross band link or repeater.General DescriptionThe SR35/50 series features a high degree of RFI and EMI screening throughout their design and construction. Thereceiver and exciter (low power transmitter) modules are contained in a solid machined aluminum enclosure, and foradditional screening each interface pin is individually filtered. The PA module is contained in a special compactextrusion for minimum harmonic radiation. In addition to this the RF modules and the micro controller are alsocontained in the main screened 2RU case for low conducted and radiated emissions and minimal susceptibility toRFI and EMI.The SR35/50 series consists of four main sub assemblies as outlined below: an Exciter Module, a Receiver Module,a Power Amplifier Module and a Micro Controller board. For further information on these sub assemblies, refer tothe Technical Description section later in this manual.Exciter Module DescriptionThe Exciter module features a modulation bandwidth to DC with an ultra wide RF bandwidth 20MHz to 1000MHzat an output power of 300mW. To change from one band to another, all that is required is to change the plug in VCOboard, no other manual adjustment or change is required. Should a high stability reference be required, the RFmodules can be fitted with connectors for an external reference oscillator input. On board memory stores calibration,personality information and program data. Alternatively, the exciter module can be set up as a conventional PLLshould simplicity and minimum cost be required. The fractional N synthesizer provides ultra low spurious while stillmaintaining fast lock times even at 6.25KHz step size or less. An optional built turn around mixer (TRM) providesadvanced diagnostics such as receiver sensitivity tests.
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.08Receiver Module DescriptionThe Receiver module features the same advanced synthesizer and wide bandwidth as the exciter. Only the front endbandpass filter and VCO need to be changed in order to support different frequency bands, resulting in significantflexibility and end-user cost savings. The custom built front end bandpass filter has a wide no-adjust bandwidthequal to the band allocation. The receiver has extremely high sensitivity while maintaining excellent intermodulationimmunity and adjacent channel rejection. A double first IF provides excellent rejection to common known spuriousresponses. High blocking of over 120dB typical ensures that strong interfering signals do not desensitize the receiverwhen receiving weak signals.Power Amplifier Module DescriptionThe PA is very compact and efficient for high reliability and low cost. The heatsink has minimal temperature riseeven under continuous operation, this also ensures the best MTBF obtainable for a practical design. A low loss 13element elliptical low pass filter ensures that any harmonics remain below -100dBc.Key Features and Advantages• Exceptional system performance.• Modular internal construction.• Software or hardware configurable.• 50 Watt continuous transmitter (30 Watt above 800 MHz).• Programming via RS232.• 256 channel capacity.• Optional CTCSS.• Paging capability.• VF filters and processing can be bypassed.• Fast mute.• 20mS Rx and Tx. 4mS selectable.• Front panel display.• Digital squelch compatible.• Wide band Rx and Tx.• Isolated PTT input.• Digitally controlled and corrected Tx deviation.• Programmable Tx power.• Direct FSK or paging compatible.• VSWR and Temp protection.• Compact 2RU case.• 13.8 Volt operation.• Available in continuous coverage from 66-88MHz, 135-520MHz and 805-960MHz.• Surface mount technology used throughout.
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.0 9• Rear analog and digital interfaces. Other options and variations available, please consult RELM Communications, Inc. for further details.Indicators and ConnectorsThe SR35/50 series can be supplied with custom front panels. The standard and OEM versions are shown below.The following tables explain the functions of the front panel LEDs. Each LED indicates the status of the SR35/50base station in real time.Standard Version front panelLED FUNCTIONPOWER Indicates the power supply voltage is within software selectable limits.RX A signal is being received by the receiver or the receivers squelch is open.TX The transmitter is transmitting RF power.CTCSS A valid Continuous Tone Coded Squelch Signal has been detected.AUX Aux function is selected or the PLL is unlocked.ALARM A general alarm condition exists such as under / over voltage or over temperature.LEDS: POWERRXTXCTCSSAUXALARMFront panelLED FUNCTIONPOWER Indicates the power supply voltage is within software selectable limits.RX A signal is being received by the receiver or the receivers squelch is open.TX The transmitter is transmitting RF power.LOW V Indicates the power supply voltage is below the software selectable limit.LOCK The RX PLL is locked correctly or the TX is keyed and the PLL is in lock.
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.010HI TEMP Indicates the power amplifier's temperature has exceeded the software selectablelimit.
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.0 11Rear Panel ConnectorsCONNECTOR DESCRIPTIONDC POWER INPUT 13.8 Volt DC power input. Also +28 Volt input on spare pin.SIMPLEX RELAY OUT ORN TYPE RX INPUT Location for internal simplex relay. The antenna for RX / TXconnects to this point. Else a N-Type connector can be used for theinput to the receiver for full duplex operation.BNC RX INPUT Standard BNC connector for the input to the receiver for fullduplex operation.N TYPE TX OUTPUT The RF power output from the transmitter for full duplex operation.SPARE RJ11 Provision for internal expansion.DB25-F PARALLEL I/O Provides two 8 bit input ports, where one is used as the parallelBCD channel select. Also one spare 8 bit input port.DB15 UNIVERSALANALOG I/O Provides the necessary analog receiver and transmitter interface forsystem expansion.RS-232 SERIAL PORT 9600 Baud serial port for frequency programming, channelselection and alarm and status monitoring.SPARE DB15 Provision for internal expansion.Rear view SR35/50DC POWER INPUT SIMPLEX RELAY OUT OR N TYPE RX INPUT OR BNC RXINPUT N TYPE TX OUTPUT THERMALLY CONTROLLED FANSPARE RJ11 TRANSMITTER HEATSINK HOLE SPARE 4 OFF SCREWS FOR DB25-F DB15 EASY PA MODULEPARALLEL I/O HOLE REMOVALDB15 UNIVERSAL RS-232ANALOG I/O SERIAL PORT
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.012Side view SR35/50MOUNTING HOLES FOR SLIDE-OUT RAILSTHE HEATSINK AIRFLOW EXITS SIDEWAYS SO ANY NUMBER OF SR35/50CAN BE STACKED IN A RACK ONE ABOVE THE OTHERInstallationWARNING: Ensure that all safety precautions are observed when working with electricaland electronic equipment. Please contact RELM Communications if youare in any doubt about the suitability of your test environment.SR35/50 series radio systems are securely packed for transport in polystyrene foam peanuts, within a pasteboardcontainer. Before unpacking the SR35/50 radio, please inspect the packaging for signs of damage and report anydamage to your SR35/50 distributor.Upon unpacking of the SR35/50 radio, please ensure that all items shipped were received, report any missing itemsto your SR35/50 distributor. All ports on the rear of the radio should be carefully examined to ensure that packaginghas not become wedged inside them. It is very important to examine the fan as operation of the radio will be effectedif any packaging causes the fan to stop working.If you intend to install the radio in an equipment rack, consult the installation manual for your system. RELMCommunications recommends that the radio is secured into the rack system using four screws through the mountingholes in the front panel, near the handles.If the radio is to be used in a stand alone configuration, ensure that it is in a secure,dry location with sufficient air space around it to allow for adequate ventilation.
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.0 13Technical DescriptionInternal ConnectionsThe internal design of the SR35/50 is of a modular nature, allowing for simple configuration and maintenance whileensuring minimal downtime. For reference purposes, an image of a typical SR35/50 system is shown below.WELDED SEALED CHASSIS CONSTRUCTION PA MODULE MICRO CONTROLLEREXCITER MODULE RECEIVER MODULE
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.014Exciter Module Technical DescriptionRF from the VCO, at a nominal level of +3dBm, is applied to the fractional-N synthesizer IC main divider input, asecond, separate RF output of the same level from the VCO is used as the main transmit RF amplifier signal source.The main signal is first buffered by a very high isolation circuit consisting of a 10dB pad and a MMIC amplifier. Thesignal is further amplified by a variable gain wide band amplifier with 40dB control range and power output of300mW. The drive power of this stage, is used to set the output power of the main power amplifier. The synthesizer'scharge pump output is filtered then amplified by the non inverting low noise op amp. The op amp uses a 25 voltpower supply so as to provide a wide tuning range voltage to the frequency control varicaps located on the VCOboard.The VCO boards and synthesizer circuits are the same for the exciter and receiver modules. The VCO consists of a10mm ceramic coaxial resonator with common base oscillator for low phase noise for bands 805-960 MHz.Frequencies below 520 MHz use an LC tank circuit. The power supply to the VCO consists of a its own 8 voltregulator and active filter for maximum noise rejection. For standard modulation, transmit audio is fed to theconventional point of the VCO varactor. For 2 point modulation, audio is also fed to the voltage control pin of theVC-TXCO, this in effect cancels out the PLL error that would otherwise have occurred for low audio frequencies,hence resulting in a flat VF response.Receiver Module Technical DescriptionThe receive signal from the antenna enters a 3 section Bandpass filter which provides the initial filtering for the frontend amplifier. The front end amplifier is a broad band high performance MMIC with a gain of 20dB, NF of 4dB and3rd OIP of +36dB. This is then followed by the second 3 section BPF, then a high level double balanced mixer. RFfrom the VCO is buffered and amplified to +17dBm and injected in the high level mixer which down converts thesignal to the IF frequency of 90 MHz. The IF signal of 90 MHz from the mixer is terminated by a bi-directionalconstant impedance diplexer network and is then amplified by a bipolar amplifier with a gain of 15dB and 3rd OIPof +35dB. This provides a high degree of intermodulation rejection for the receiver. This stage is followed by a 4pole 90 MHz crystal filter with its associated matching networks. The signal is further amplified and filtered by atransistor and its associated 2 pole crystal filter before being fed into the main IF demodulator chip with a second IFfrequency of 455 KHz. The resulting audio is passed out to the micro controller board.PA Module Technical DescriptionRF from the exciter is first attenuated by a 50 ohm pad which is used to provide a good 50 ohm source impedancefor the high power hybrid amplifier. The RF is amplified to between 5 and 13 watts at its 50 ohm output. The signalfrom the hybrid is then matched by a broad band network to drive the low input impedance associated with the finaltransmit power amplifier transistor. The transistors low collector impedance is then also matched back to 50 ohmswith a broad band matching network. Several trimmer capacitors enable adjustment of the power amplifier over awide bandwidth so as to maintain good conversion efficiency.The dual directional coupler consists of coupled microstrip transmission lines fabricated on the PCB artwork. Thesampled RF energy is rectified to provide a proportional DC voltage output. Prior to transmission a low loss 13element elliptical low pass filter, filters out the unwanted harmonics to less than -100dBc.
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.0 15Micro Controller ConfigurationThe view below is an image of the micro controller layout and the position of the jumpers and DIP switches(highlighted) which are used for setting the general configuration of the audio filters, PTT functions and othervarious facilities.NOTE: Not all components shown are fitted.
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.016Description of Micro Controller Jumper functionsJMP # FUNCTION / DESCRIPTIONJMP 1 Selects either default RUN or EMULATE mode for the micro processor.JMP 2 Enables the WATCHDOG auto reset function in the micro processor.JMP 3 Enables or disables the PRE-EMPHASIS for the Tx audio.JMP 4 Enables or disables the COMPRESSOR for the Tx audio.JMP 5 Enables or disables the HIGH PASS FILTER for the Rx audio.JMP 6 Enables or disables the LOW PASS FILTER for the Rx audio.JMP 7 Enables or disables the DE-EMPHASIS processing for the Rx audio.JMP 8 Selects a common earth or floating PTT input. Also see Appendix B.JMP 9 Selects the PTT mode. Also see Appendix B.JMP 10 Controls the direction of the RS-232 Tx and Rx data. Also see the next section and Appendix B.JMP 11 Controls the direction of the RS-232 Tx and Rx data. Also see the next section and Appendix B.JMP 12 Enables a direct connection to the Tx modulation. Not normally used. Also see Appendix B.JMP 13 Enables or disables the HIGH PASS FILTER for the Tx audio.JMP 14 Enables a direct connection to the Tx modulation via the limiter and post LPF.Also see Appendix B.
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.0 17TestingThe following equipment is required to test SR35/50 series radios:• A Radio communications test set with 600 Ω interfaces.• A digital multimeter.• An oscilloscope.• 13.8V Power Supply.• A PC compatible personal computer with at least 8Mb of RAM, a serial port and the "SR35/50 Base StationUtility" software installed.• A suitable cable to connect the serial port of the PC to the SR35/50 radio’s RS-232 port. The details of this cablecan be found in Appendix B.• A suitable power lead as supplied with the radio is being tested.• Suitable low loss RF cables and connectors.WARNING: Attempting to operate the transmitter without an appropriate loadconnected to the RF output may cause physical damage to the unit and voidthe warranty. Please contact RELM Communications if you are in anydoubt about the suitability of your test environment.Connecting a computer to the SR35/50 radio.The standard cable used to connect the computer to the SR35/50 is a serial "Lap-Link" type cable. This usuallyconsists of a lead with a DB9 and DB25 female connector at each end. The Rx and Tx data signals are crossconnected in "Lap-Link" type cables. There are two jumper links on the Micro Controller circuit board inside theSR35/50 designated JMP10 and JMP11, their default position is pin 2&3 or "SWAP". This indicates that a leadwhich swaps Rx and Tx data is in use.Other special serial leads can also be used. In order to allow for more combinations you can set JMP10 and JMP11to position 1&2 or "NORM" which has the effect of swapping over pins 2 and 3 on the DB9 rear connector.Test SetupAll connections are made at the rear of the SR35/50.Connect the Transmitter RF output located on the heatsink module to the dummy load / Tx test input of the RadioCommunications Test Set using a short length of low loss RG 213 or equivalent coaxial cable.Connect the Receiver RF input to the Signal Generator output of Radio Communications Test Set using moderate tolow loss coaxial cable.Connect all VF interfaces' and control lines to the appropriate points.Connect the SR35/50 Radio to a suitable 13.8 Volt DC power supply while observing the correct polarity.
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.018Test ProcedureRefer to Calibration Procedure.SR35/50 Base Station UtilityInitial Setup And DescriptionMain Display Tool Bar DescriptionThe "Channel Info" button is used to view and setup the frequency information in the SR35/50.The "Analyze" button reads the internal status of the SR35/50 and displays as such.The "Update" button is only used when SETUP - DYNAMIC is selected. Pressing "Update" sends the dynamicsettings to the SR35/50 for quick initial testing. The values are not saved in the SR35/50. It is also used to setup thedefault values as used in the channel programming.The other buttons duplicate "Save", "Open File", "Send Data to Radio" and "Load Data from Radio" as seen on theChannel Info screen respectively.Initial SettingsIn order to read or send data to the SR35/50 a file must first be created or opened.Initial Static SettingsGo to SETUP STATIC and set the appropriate values and conditions for the SR35/50. Press "SEND" to send andstore the values inside the SR35/50. Note that reference, IF frequencies and injection are not stored in the SR35/50,so this must reflect the actual physical conditions of the SR35/50. The standard reference oscillator is 14.4MHz. TheStandard IF is 90MHz, with high side injection Bands A to I and low side J to X. The PLL correction factor value isusually around 120. The fan on temperature is normally set to 40C with the over temperature cutout at 70C.Channel Programming and Description
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.0 19In the Channel Info screen click on the channel you wish to setup. You can view all of the settings and calibrationdata, however you will need to enter the password by clicking the "Advanced" button to proceed. This level ofprotection is provided to advise that changes may allow the transmitter to potentially cause interference to vital radiocommunications services. See also the QUICK FREQUENCY PROGRAMMING and FULL CALIBRATIONsections.QUICK FREQUENCY PROGRAMMING( If a calibrate has already been performed)In the channel information screen, click the channel number you wish to change or create. Enter into the"Advanced" mode with the correct password. Enter the frequencies' of the channel. Inject an audio signal withsufficient level (~0dBm) to ensure compressor operation and check the deviation is 3KHz for 25KHz channelspacing or 1.5KHz for 12.5KHz spacing. Adjust the VCO deviation for the correct level. Most of the other settingswill not change. If in doubt see the FULL CALIBRATION section.FULL CALIBRATION(TX MODULATION) Suggested MethodRecommended Full Calibration Procedure with DC-FM installed. The alignment may be carried out in the SETUPDYNAMIC for a quicker result. Calibration is performed on the center RF frequency.1. Set the Reference Level to 0 and the Reference Bias to 127.2. On the SR35/50 Micro controller Board set Pre-emphasis, Tx HPF and the Tx VF Compressor to OFF. Turn theTx Compress Level RV2 fully clockwise to maximum. This will allow the hard limiter to operate.3. Inject a 1KHz audio signal into the Tx VF input at a level of +10dBm. Check with an oscilloscope that the audiosignal is clipped at the Tx Limiter Test Point.4. Set the VCO Level to achieve 4.8KHz deviation (clipped waveform) in the case of 25KHz channel spacing and2.3KHz deviation in the case of 12.5KHz channel spacing. If CTCSS is used then subtract further the nominalCTCSS system deviation level.5. Reduce the level from the audio oscillator to obtain a sinewave modulation, now vary the modulation frequencyaround 50 to 500Hz and adjust the Bin Accel Factor for an approximately flat response.Caution: Do not enter too low a value or the lock time and stability will be affected.Return the audio level to +10dBm.6. Set the modulation frequency to about 300Hz. Observe the demodulated clipped sinewave with drooping positiveand negative deviation peaks. Now increase the "Ref Level" and the degree of drooping will reduce. Adjust so thatflat top is observed on the demodulation waveform. Check that if you vary the modulation frequency across a rangeof 50Hz to 1KHz the frequency response is flat. The peak deviation should still be the same as in step 4, if not repeatsteps 4 and 6.
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.020Note: The modulation flatness will rise around 2KHz if the SR35/50 is fitted with Butterworth or Chebychev typefilters for the main limiter post LPF as used in the EIA-603 Build. It is due to the filters group delay distortion. Fora flatter response ensure the standard Bessel filter is fitted.7. Set the transmitter carrier center frequency by adjusting the "Ref Bias" Level if necessary. Check again step 6 asthere is some interaction from the reference oscillator due to non-linearity. Repeat as necessary.8. Save as defaults.9. Return the jumpers as previous in step 2. Adjust the Tx Compress Level RV2 for the standard system deviationlevel. Usually 3KHz for 25KHz channel spacing and 1.5KHz for 12.5KHz spacing.10. Set the VF level to the standard input level (-10dBm) and adjust the compress Tx VF Gain to just compress.11. Go to the Channel Info screen and click on the channel number to be allocated to the calibration results. Clickon Get Defaults, then OK.12. Go to the next channel and load defaults. Key in the appropriate RF frequencies and set the VCO Level for thesame deviation as in step 9. Repeat this step for all the channels required. Note that a small error will result in thecalibration of the "Ref Level" as in step 6 if the next channel frequency varies greatly from the original calfrequency. Recalibrate the "Ref Level" if necessary.Caution: Due the high degree of adjustment available in the SR35/50, check the PLL stability bymonitoring the PLL tune voltage with a CRO at the onset of PTT for minimal ringing.Description of Program FunctionsSynthesizer ControlThe SR35/50 Base Station has the facility for precise software control of the PLL characteristics. This provides userwith additional flexibility and capability for specialized or precise setting. The following program functions allow forcontrol of the fractional-N synthesizer and are described as such:PLL Correction Factor: Controls the relative amount of charge current into the PLL charge - pump circuit. Thevalue for the PLL Correction Factor is loaded into the receiver and exciter synthesizer during normal operation. It isprimarily used to control the dynamic PLL settling characteristics. A value of 0 will provide a minimum current andhence a slow and under damped loop response. A value of 255 will provide the maximum current and hence a fastand overdamped loop response.Bin Accel Main: Same as PLL Correction Factor except that the value for the Bin Accel Main is only loaded intothe exciter synthesizer during the transmitter modulation period. It is primarily used to control the static PLLcharacteristics. This will allow adjustment for a maximally flat modulation response near the cutoff frequency of thePLL. A value of 0 will provide a minimum current and hence an under damped response. A value of 255 willprovide the maximum current and hence an overdamped response.Modulo: A modulo value of 8, sets the synthesizer comparison frequency to 8 times that of the Channel Spacing(synthesizer step size). A value of 5 is 5 times respectively.
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.0 21Channel Spacing: May also be referred to as the synthesizer step. As a rule the oscillator frequency must beinteger divisible by the modulo value and then the step size. The step size is usually set to half that of the channelspacing.Accel Proportion: Controls the degree of speedup at the onset of PTT.Accel Integral: Controls the multiplication factor of the Accel Proportion.For further information and reading, you may refer to the Philips Semiconductor Data Book for the SA7025DK chip.Modulation ControlDC-FM uses two point modulation and its parameters can be set by the following:VCO Deviation: The digital pot value sets the modulation level fed to the VCO's modulation input. A value of 0sets the minimum deviation level. A value of 255 sets the maximum deviation level.Reference Bias: The digital pot value sets the center carrier frequency of the transmitter frequency. A value of 0sets the highest carrier frequency. A value of 255 sets the lowest carrier frequency. A value around 128 is normallyused. If the value is to high or too low this may result in unsymmetrical modulation distortion due to the limitedrange of the master reference oscillator.Reference Level: The digital pot value sets the modulation level fed to the master reference oscillator. A value of 0sets the minimum deviation level. A value of 255 sets the maximum deviation level. It primarily is used to set themodulation balance at low frequencies.Transmit RF Power OutputTransmit Power: The digital pot value sets the RF drive level to the power amplifier. A value of 0 sets thetransmitter power to minimum. A value of 255 sets the transmitter power to maximum.CTCSS ControlTx Subtone: Enters directly the frequency of the transmitter's modulation encoder.Rx Subtone: Enters directly the frequency for the receiver's decoder to operate.Tx Subtone Level: This value controls the level of the transmitter's modulation encoder. Steps are 0.85dB.Channel selectionThree methods are available for channel selection.
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.022Software Channel Select via Utility Program: First ensure that channel 0 is selected on the DIP switch DIP1 locatedon the Micro Controller Board (all 8 switches in the off position). Enter the channel number in the Software SelectChannel window on the Channel Info screen and press Select.Software Channel Select via Serial Command: First ensure that channel 0 is selected on the DIP switch DIP1located on the Micro Controller Board (all 8 switches in the off position). Send the string "chansXXX" where XXX= a 3 digit number for the channel number. eg To select channel 5 send the string "chans005". Baud rate is 9600BPS.Hardware Channel Select: Select the fixed channel for the SR35/50 by using the DIP switch DIP1 located on theMicro Controller Board. Channel 1 to 255 is available in binary selection. Switch position 1 is channel 1, position 2is channel 2, position 3 is channel 4, position 4 is channel 8, position 5 is channel 16, position 6 is channel 32,position 7 is channel 64, position 8 is channel 128. For further details of all possible channels see APPENDIX C.TroubleshootingThe most common causes of problems are listed below.Incorrect parameters set in SR35/50 Utility Program such as1. Wrong Reference frequency oscillator value.2. PLL correction factor or Bin Accel value too low.3. Accel values extreme.4. Channel spacing value not correct.5. Frequency value is not a multiple of the channel spacing / step size.Other problems may include Jumpers or DIP switches in wrong positionsGlossary3RD OIP Third Order Intercept Point4LFSK 4 Level Frequency Shift KeyingAPCO-25 Associated Public-Safety Communications Officers, Inc. Project 25AUX AuxiliaryBPF Band Pass FilterBW BandwidthCMOS Complementary Metal Oxide SiliconCRO Cathode Ray OscilloscopeCTCSS Continuous Tone Coded Squelch SystemDC Direct CurrentDIP Dual Inline PackageDDS Direct Digital SynthesisDSP Digital Signal ProcessorEMI Electro Magnetic InterferenceFSK Frequency Shift KeyingHPF High Pass FilterIC Integrated CircuitIF Intermediate FrequencyI/O Input / Output
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.0 23JMP JumperLC tank circuit Resonant circuit consisting of an Inductor and Capacitor networkLED Light Emitting DiodeLPF Low Pass FilterMMIC Microwave Monolithic Intergrated CircuitMobitex Radio messaging systemMTBF Mean Time Between FailureNF Noise FigurePA Power AmplifierPad Circuit board landPCB Printed Circuit BoardPLL Phase Locked LoopPPM (ppm) Parts Per MillionPTT Push To TalkPOCSAG Post Office Code Standardization Advisory GroupRAM Random Access MemoryRF Radio FrequencyRSSI Received Signal Strength IndicatorRU Rack UnitRx ReceiverSimplex Single operation of either Transmitter or ReceiverS/N Signal to Noise RatioSquelch Muted audio signalSW SwitchTEMP TemperatureTRM Turn Around MixerTx TransmitterUHF Ultra High FrequencyVCO Voltage Controlled OscillatorVC-TXCO Voltage Controlled Temperature Compensated Crystal OscillatorVF Voice FrequencyVHF Very High FrequencyVSWR Voltage Standing Wave Ratio
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.024Appendix A SpecificationsMinimum Performance SpecificationMinimum performance to exceed the following for 66MHz to 960MHz*:ETS 300 086 Jan 1991FCC Part 90TIA/EIA-603BAPT 225 ZV 1/2098 (German Softkeying)CEPT T/R 24-01 E Sept 1988EC Marking, EC EMC Directive 89/336/EECETS 300 113MIL-STD-810ERFS32TIA/EIA-603General SpecificationsSR35/50 Rack Size: 2RU Case, 330mm deep inc fan.SR35/50 Overall Physical Size 89mm high, 360mm deep, 483mm wideSupply Voltage: 13.8V +/- 20%.Power Consumption: <600 mA receive, typical 440 mA.<11A for 50W Tx RF.Operating Temperature: -10 to +60 C. -30 to +60 C option.Individual Module Dimensions: Rx & Tx W=100, L=180, H = 30mm.PA W=78, L=300, H = 60mm.Standard LED indicators: Power, Rx, Tx, CTCSS, Aux, Alarm.Frequency Range: Coverage 66-960 MHz.Synthesis Method: Non mixing PLLFractional N synthesizer.Modulation: Direct FM, +/- 5 KHz+/-2.5 KHz narrow band.Channel Spacing: 30 KHz, 25 KHz or 12.5 KHz.Synthesizer Step Size: 30, 25, 12.5, 7.5 or 6.25KHz.Channels: 256 Software or switch selectable1-99 BCD parallel selection.
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.0 25Frequency Range: Coverage 66-960 MHz.Other frequencies or band allocations available.Contact RELM Communications for details.Band A 66-80 MHz.Band B 74-88 MHz.Band C 135-160 MHz.Band D 155-180 MHz.Band E 175-200 MHz.Band F 195-225 MHz.Band G 220-250 MHz.Band H 245-275 MHz.Band I 270-300 MHz.Band J 295-325 MHz.Band K 320-350 MHz.Band L 345-375 MHz.Band M 370-400 MHz.Band N 395-430 MHz.Band O 425-460 MHz.Band P 455-490 MHz.Band Q 485-520 MHz.Band R 805-825 MHz.Band S 824-849 MHz.Band T 850-870 MHz.Band U 872-905 MHz.Band V 890-915 MHz.Band W 917-950 MHz.Band X 925-960 MHz.Transmitter Module SpecificationsRF Power Output: 5W to 50W (66-520 MHz).5W to 35W, 50W optional for13.8V/28V rail(800-960 MHz).100W on special request.Frequency Stability: 2.5PPM, 1.5PPM or 1.0PPM.Audio Response: Flat within +/- 0.5dB across BW.Bessel LPF for data or Chebychev LPFAudio Bandwidth: DC(J-X Band) to 3400Hz base band(-0.5dB) 300Hz to 3000Hz for EIA-603300Hz to 3400Hz nominal.Modulation Distortion: Less than 2% C-weighted.S/N Ratio: Better than 50dB, wide band.Better than 44dB, narrow Band.Spurious: Better than -90dBc.RF Switching Bandwidth: Same as band allocation.RF Switching Bandwidth PA: 10MHz nominal, full band useable.Duty Cycle: 100% for 50W RF output with
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.026Thermal controlled fan.RF Rise Time: 4mS with continuous VCO selected(Controlled RF envelope).Receiver Module SpecificationsSensitivity: Better than -117dBm for 12dB ( 25 KHz spacing ), C-weighted, De-emphasis. Typical -120dBmSelectivity 66-520MHz (Option): More than 80 dB for 25 KHz adj channel, more than 70 dB for12.5 KHz adj channel, for switching BW 10MHz minimum.Selectivity 66-520MHz: More than 75 dB for 25 KHz adj channel, more than 65 dB for12.5 KHz adj channel, for switching BW same as bandallocation.Selectivity 805-960MHz: More than 70 dB for 25 KHz adj channel more than 65 dB for12.5 KHz adj channel for switching BW same as bandallocation.Spurious Resp: Better than 90dB.Intermodulation: Better than 80dB.Blocking: Better than 100dB at +/- 1MHz point.Distortion: Less than 2%.S/N Ratio: Better than 50dB C-weighted, wide band. Better than 44dB C-weighted, narrow band .RF Switching Bandwidth: 10MHz minimum or equal to band allocation.Receiver Front End BW: Equal to band allocation, no retuning.Audio Bandwidth: DC to 3400Hz (-0.5dB)Squelch Opening Time: 20mS.Squelch Closing Time: 100mS.Conducted Spurious: Less than -57dBm, typ -90dBm.AncillariesTx Timer: 2 minutes, on/off selectable.VF Level to Line: +6 to -15dBm, 600 ohms unbalanced or differential.VF Level from Line: +6 to -15dBm, 600 ohms unbalancedPre-Emphasis Accuracy: Within +/-0.5dB of 6dB per octave curve.De-Emphasis Accuracy: Within +/-0.5dB of 6dB per octave curve.VF Compressor Range: >30dB for line input,Control Outputs: 1K ohm 5V source/sink available.Alarm Output: Open collector.PTT Input: Logic or Opto-isolated +/- 5 to 48V.Channel Select: 8 way Dip switch or RS232 or BCDRepeater Tail Timer: 2 seconds nominal.
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.0 27Appendix B Interface ConnectionsSR35/50 Rear Chassis Connector DescriptionUniversal DB15 Analog I/OPin Number And Description: Universal Analog I/O DB15 Female Rear Connector Universal Analog I/O DB15 Male Rear Connector Internal Circuit Board Header SKH Connector811EARTH.Use this Earth for general connection and PTT return. For Analog Earth and Audiocommon use the ANALOG EARTH pin.15 9 2 RECEIVER AUDIO 600ΩΩΩΩ.Normal receiver audio output from op-amp. Nominal line level is set to -10dBm.Common return to analog Earth or differential audio output pin.723RECEIVER AUDIO 5ΩΩΩΩ.Low impedance differential audio output from op-amp.14 10 4 RX MUTE / SQUELCH MONITOR.The mute status may be monitored by reading this voltage. 5 volt logic high =signal received or the mute is open. Output impedance = 100KΩ . Connect to highinput impedance (>1MΩ).635O/C ALARM OUTPUT.Open collector output sinks current to earth when an alarm condition occurs. Samefunction as front panel Alarm LED. An alarm is generated if the Power Amplifier isover temperature or if the supply voltage exceeds the defined limits. The trip pointsare selectable via the utility program.13 11 6 TX DC-FM INPUT.Wide band audio or data may be connected to this point. In order to conform totransmitter bandwidth emissions limits, this input is hard limited to the nominaldeviation and Bessel filtered -3dB @ 3400Hz for minimum group delay. Inputimpedance is 100KΩ. If this input is not used then jumper # JMP14 on the MicroController board should be removed to avoid any pickup of stray signals, oralternatively do not connect any wires to this pin. Also avoid the use of ribboncables longer than 30-50cM as this may also result in excess coupling or crosstalk.547TX REFLECTED POWER.The voltage from the reflected power directional coupler in the Power Amplifiergoes directly to this pin. In a correctly terminated load the voltage should be lessthan 200mV. Depending on the degree of mismatch at the load, the voltage will riseto approx 3-4 volts for 50 Watts forward power. The internal reflected powercontrol circuit also monitors this point, such that when the reflected power voltageexceeds half that of the forward power voltage the forward power is then reducedto about 25% of full power. Full forward power is returned when the reflectedpower drops below the trip point mentioned. The output impedance is about 5KΩ.
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.02812 12 8 TX PTT IN.The standard PTT input is normally active low and may be driven from standardlogic outputs or open collector. JMP9 should be in and JMP8 in position 1-2. Tochange polarity or voltage input also see OPTO PTT IN. Removing JMP9 willinput the PTT via the opto coupler.459RX DISCRIMINATOR.The receiver discriminator audio output is buffered, unfiltered and DC coupled tothis point. Output impedance is low.11 13 10 TX OPTO PTT IN.This input is only used if a floating or opto input PTT is required. JMP9 MUST beremoved. Positive or negative keying voltage can be applied to the input due to fullwave rectifier and opto circuit. For a fully floating differential input voltage (+/-5to +/-48 VDC) set jumper JMP8 in position 1-2. Putting JMP8 in position 2-3 willconnect this point to earth.3611TX FORWARD POWER.The voltage from the forward power directional coupler in the Power Amplifiergoes directly to this pin. In a correctly terminated load the voltage should be about3-4 Volts for 50 Watts. The output impedance is about 5KΩ. The internal forwardpower control circuit also monitors this point.10 14 12 ANALOG EARTH.General analog earth common for VF input and output.2713TEMPERATURE OUTPUT.The temperature output voltage is proportional to the temperature on the poweramplifier heatsink.91514TRANSMIT AUDIO INPUT 600ΩΩΩΩ.Transmitter audio input to op-amps etc. Nominal line input level is -10dBm. Canhandle levels to greater than +10dBm. Common return to analog Earth.1815RX RSSI OUTPUT.The receiver's received signal strength indicator voltage is proportional to the logof the signal level at the antenna input. Voltage range is 0 to 5 volts. Outputimpedance is low. Dynamic range > 60dB.NC NC 16 WIDE BAND TX MODULATION INPUT.Wide band audio or data may be connected to this point. WARNING: In order toconform to transmitter bandwidth emissions limits, the signal MUST be pre-filtered, failure to do this WILL result in non-compliance of the Tx emissionspectrum. This input is not normally used except in special cases.
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.0 29DB25 Digital I/O ConnectorEach CMOS logic input is protected by a 10K Ohm series resistor to the input of the logic chip. There is also a 10KOhm pull down resistor at each input so as to default the input value to zero.Each logic output is protected by a 1K Ohm series resistor from the output of the logic chip.Pin Number And Description: Digital I/O DB25 Female Rear Connector (standard connection) Digital I/O DB25 Male Rear Connector Internal Circuit Board Header SKF Connector13 1 1 DIGITAL GROUND25 14 2 INPUT PORT A. Spare 8 bit Logic Input bit 0.12 2 3 INPUT PORT A. Spare 8 bit Logic Input bit 1.24 15 4 INPUT PORT A. Spare 8 bit Logic Input bit 2.11 3 5 INPUT PORT A. Spare 8 bit Logic Input bit 3.23 16 6 INPUT PORT A. Spare 8 bit Logic Input bit 4.10 4 7 INPUT PORT A. Spare 8 bit Logic Input bit 5.22 17 8 INPUT PORT A. Spare 8 bit Logic Input bit 6.959INPUT PORT A. Spare 8 bit Logic Input bit 7.21 18 10 INPUT PORT B. BCD Channel Select Units bit 0.8611INPUT PORT B. BCD Channel Select Units bit 1.20 19 12 INPUT PORT B. BCD Channel Select Units bit 2.7713INPUT PORT B. BCD Channel Select Units bit 3.19 20 14 INPUT PORT B. BCD Channel Select Tens bit 0.6815INPUT PORT B. BCD Channel Select Tens bit 1.18 21 16 INPUT PORT B. BCD Channel Select Tens bit 2.5917INPUT PORT B. BCD Channel Select Tens bit 3.17 22 18 OUTPUT PORT C. Spare 8 bit Logic Output bit 0.41019OUTPUT PORT C. Spare 8 bit Logic Output bit 1.16 23 20 OUTPUT PORT C. Spare 8 bit Logic Output bit 2.31121OUTPUT PORT C. Spare 8 bit Logic Output bit 3.15 24 22 OUTPUT PORT C. Spare 8 bit Logic Output bit 4.21223OUTPUT PORT C. Spare 8 bit Logic Output bit 5.14 25 24 OUTPUT PORT C. Spare 8 bit Logic Output bit 6.11325OUTPUT PORT C. Spare 8 bit Logic Output bit 7.NC NC 26 NOT CONNECTEDPC Serial Port to Radio CableSignal Name DB9 PIN#TD Transmitted Data 2RD Received Data 3SG Signal Ground 5
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.030Also see Testing SectionAppendix C DIP Switch SettingsDIP Switch 1 Channel SelectionThere are three methods are available for channel selection (see also the section SR35/50 Base Station Utility).Software Channel Select via Utility Program: First ensure that channel 0 is selected on the DIP switch DIP1located on the Micro Controller Board (all 8 switches in the off position). Enter the channel number in the SoftwareSelect Channel window on the Channel Info screen and press Select.Software Channel Select via Serial Command: First ensure that channel 0 is selected on the DIP switch DIP1located on the Micro Controller Board (all 8 switches in the off position). Send the string "chansXXX" where XXX= a 3 digit number for the channel number. eg To select channel 5 send the string "chans005". Baud rate is 9600BPS.Hardware Channel Select: Select the fixed channel for the SR35/50 by using the DIP switch DIP1 located on theMicro Controller Board. Channel 1 to 255 is available in binary selection. Switch position 1 is channel 1, position 2is channel 2, position 3 is channel 4, position 4 is channel 8, position 5 is channel 16, position 6 is channel 32,position 7 is channel 64, position 8 is channel 128.A table of DIP switch 1 settings follows, where switch ON is indicated by a "x" in a cell and no entry in a cellrepresents a switch OFF.Channel SW 1 SW2 SW3 SW4 SW5 SW6 SW7 SW801x2x3x x4x5x x6xx7x x x8x9x x10 x x11 x x x12 x x13 x x x14 x x x15 x x x x16 x17 x x18 x x19 x x x20 x x
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.0 3121 x x x22 x x x23 x x x x24 x x25 x x x26 x x x27 x x x x28 x x x29 x x x x30 xxxx31 x x x x x32 x33 x x34 x x35 x x x36 x x37 x x x38 x x x39 x x x x40 x x41 x x x42 x x x43 x x x x44 x x x45 x x x x46 x x x x47 x x x x x48 x x49 x x x50 x x x51 x x x x52 x x x53 x x x x54 xx xx55 x x x x x56 xxx57x xxx58 x xxx59x x xxx60 xxxx61x xxxx62 xxxxx63x xxxxx64 x65 x x66 x x67 x x x68 x x69 x x x70 x x x71 x x x x
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.03272 x x73 x x x74 x x x75 x x x x76 x x x77 x x x x78 x x x x79 x x x x x80 x x81 x x x82 x x x83 x x x x84 xxx85x xxx86xxxx87xxxxx88 x x x89 x x x x90xxxx91 x x x x x92 x x x x93 x x x x x94 xxxx x95 x x x x x x96 x x97 x x x98 x x x99 x x x x100 x x x101 x x x x102 x x x x103 x x x x x104 x x x105 x x x x106 x x x x107 x x x x x108 xx xx109 x x x x x110 x x x x x111x xxx xx112 x x x113 x x x x114 x x x x115 x x x x x116 x x x x117 x x x x x118 xx xxx119 x x x x x x120 x x x x121 x x x x x122 x x x x x
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.0 33123 x x x x x x124 x x x x x125 x x x x x x126 xxxxxx127 x x x x x x x128 x129 x x130 x x131 x x x132 x x133 x x x134 x x x135 x x x x136 x x137 x x x138 x x x139 x x x x140 x x x141 x x x x142 x x x x143 x x x x x144 x x145 x x x146 x x x147 x x x x148 x x x149 x x x x150 x x x x151 x x x x x152 x x x153 x x x x154 x x x x155 x x x x x156 x x x x157 x x x x x158 xxxx x159 x x x x x x160 x x161 x x x162 x x x163 x x x x164 x x x165 x x x x166 x x x x167 x x x x x168 x x x169 x x x x170xxxx171 x x x x x172 x x x x173 x x x x x
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.034174 x x x x x175 x x x x x x176 x x x177 x x x x178 x x x x179 x x x x x180 xxxx181 x x x x x182 xx xx x183xxxxxx184 x x x x185 x x x x x186 x x x x x187 x x x x x x188 x x x x x189 x x x x x x190 xxxxx x191 x x x x x x x192 xx193 x x x194 x x x195 x x x x196 x x x197 x x x x198 xx xx199 x x x x x200 x x x201 x x x x202 x x x x203 x x x x x204 x x x x205 x x x x x206 x x x x x207 x x x x x x208 x x x209 x x x x210 x x x x211 x x x x x212 x x x x213 x x x x x214 x x x x x215 x x x x x x216 xx xx217 x x x x x218xxxxx219x x xx xx220 x x x x x221x xxx xx222 xxxx xx223 x x x x x x x224 x x x
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.0 35225 x x x x226 x x x x227 x x x x x228 x x x x229 x x x x x230 x x x x x231 x x x x x x232 x x x x233 x x x x x234 x x x x x235 x x x x x x236 xx xxx237 x x x x x x238 xxx xxx239x xxx xxx240 xxxx241 x x x x x242 x x x x x243x x xxxx244 x x x x x245x x xxxx246 xx xxxx247 x x x x x x x248 xxxxx249x xxxxx250 x xxxxx251x x xxxxx252 xxxxxx253x xxxxxx254 xxxxxxx255x xxxxxxx
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.036DIP Switch 2 User Function SelectSwitch Number DescriptionSwitch 1 PTT DelayInserts a 100mS delay for the Transmitter RF rise time. Must beselected when using a coaxial simplex changeover relay to preventswitching RF power.Switch 2 Simplex OnSelects simplex mode of operation.Switch 3 Tx Timer OnTransmitter is disabled after 2 minutes continuous use.Switch 4 Repeater OnSelects automatic Receiver to Transmitter repeater function. TheTransmitter will also have a 2 second ‘hang time’.Switch 5 Tx VCO ContEnables the Transmitter’s VCO to operate continuously in ‘hotstand by’ mode. This speeds up the Transmitter’s rise time to 4mS.Caution: Low level signal leakage may affect the receiver’sperformance if the Transmitter is on the same frequency.Switch 6 Tx FSKGenerates an FSK test signal. Not normally used.
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.0 37Appendix D Model # Configuration GuideRev 1.3 13th October 1997. Consult Spectra for availability details on specific configurations and options.TX POWER CHANNEL ALLOC FREQ STABILITYM35 Watts N12.5 KHz 1 1.0PPM (-30 to 60C)H50 Watts W25 KHz 2 1.5PPM (-10 to 60C)V100 Watts 3 2.5PPM (-30 to 60C)SR35/50 Insert Z for Nil itemTX FREQ RX FREQBand RF CONFIGURATIONA66-80 MHz D DuplexB70-88 MHz S SimplexC135-160 MHzC2 138-149 MHzD155-180 MHzD2 159-166 MHzD3 148-174 MHzE175-200 MHz FRONT PANELF195-225 MHz S StandardG220-250 MHz C CustomH245-275 MHzI270-300 MHzI2 276-284 MHzJ295-325 MHz OPTIONK320-350 MHz SSpecial VersionL345-375 MHz CCTCSS Enc & DecM370-400 MHz DDigital ModulatorN395-430 MHz 44 Level FSK ModemsN2 400-435 MHz FFFSK ModemsO425-460 MHz TSelf Test Local LoopbackP455-490 MHzP2 450-485 MHzQ485-520 MHzQ2 500-532 MHzR805-825 MHzS824-849 MHz Notes:T850-870 MHz 1. Band C2, D2, I2 for Digital Tx only.U872-905 MHz 2. Band Q2 Receive only.
S Series Repeater USER MANUAL©RELM Communications Inc. Revision 1.038V890-915 MHz 3. 100 Watt on special application only.W917-950 MHzX925-960 MHz

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