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Pyramid Communications SVR-250 Service Manual

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SVR-250 Service Manual

Table of Contents

Foreword ............................................................................................................................................... 2
Specifications ........................................................................................................................................ 3
Functional Description.......................................................................................................................... 4
Multi-Vehicle Format ........................................................................................................................... 4
ESP Priority Format .............................................................................................................................. 5
Local Mic Repeat .................................................................................................................................. 5
Trunking Operation .............................................................................................................................. 5
Emergency Operation ........................................................................................................................... 6
Dual Tone Operation ............................................................................................................................ 6
Auxiliary Receiver Operation ............................................................................................................... 6
WideBand/NarrowBand Channels ........................................................................................................ 7
Courtesy Beep ....................................................................................................................................... 7
Power Up Channel ................................................................................................................................ 7
Full Duplex Operation .......................................................................................................................... 7
LED Indicators ...................................................................................................................................... 7
Installation ............................................................................................................................................ 8
Jumpers ................................................................................................................................................. 8
Main Connector .................................................................................................................................... 8
VHF Transmitter Alignment ............................................................................................................... 10
VHF Receiver Alignment ................................................................................................................... 11
UHF Transmitter Alignment ............................................................................................................... 12
UHF Receiver Alignment ................................................................................................................... 13
700/800/900MHz Transmitter Alignment .......................................................................................... 14
700/800/900MHz Receiver Alignment ............................................................................................... 15
Programming ...................................................................................................................................... 17
Common Data ..................................................................................................................................... 18
Channel Data ...................................................................................................................................... 19
Transfer ............................................................................................................................................... 20
Remote Help ....................................................................................................................................... 20
ARS-250 Programming ...................................................................................................................... 21
Flash Programming ............................................................................................................................. 22
Theory of Operation ............................................................................................................................ 24
Parts List Main PCB ........................................................................................................................... 26
Parts Locator Main PCB ..................................................................................................................... 28
Schematic Main PCB .............................................................................................................. Foldout 1
Front Panel Assembly ............................................................................................................. Foldout 2
VHF Transmitter ..................................................................................................................... Foldout 3
VHF Receiver ......................................................................................................................... Foldout 4
UHF Transmitter ..................................................................................................................... Foldout 5
UHF Receiver ......................................................................................................................... Foldout 6
700/800/900 MHz Transmitter ............................................................................................... Foldout 7
700/800/900 MHz Receiver .................................................................................................... Foldout 8
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Summary of Contents for Pyramid Communications SVR-250

  • Page 1: Table Of Contents

    SVR-250 Service Manual Table of Contents Foreword ............................... 2 Specifications ............................3 Functional Description.......................... 4 Multi-Vehicle Format ........................... 4 ESP Priority Format ..........................5 Local Mic Repeat ..........................5 Trunking Operation ..........................5 Emergency Operation ........................... 6 Dual Tone Operation ..........................6 Auxiliary Receiver Operation .......................

  • Page 2: Foreword

    FCC information The SVR-250 complies with the FCC rules parts 90 and 22 for radio frequency transmitters. The user must apply for a license to operate the SVR-250 transmitter pursuant to parts 90.243 and 90.247. Other FCC rules may apply depending on the class of service the user qualifies for.

  • Page 3: Specifications

    SVR-250 Service Manual Specifications Transmitter: 700/800/900 MHz Frequency Range: 150-174 MHz 405-425 MHz (UA) 764-776, 794-806 (MC,MD) 450-470 MHz (UD) 806-824, 850-870 (MB,MA) 470-490 MHz (UE) 897-902, 936-941 (ME,MF) Rf power out: 250mW - 2W 250mW - 2W 100mW - 600mW...

  • Page 4: Functional Description

    The SVR-250 has a programmable time out timer for base-to-portable transmissions. If the mobile COR is active for more than the programmed time (and the SVR-250 is the priority unit) it will send a double blip and cease transmission until the mobile COR is inactive. The time-out is in affect regardless of whether the SVR-250 is programmed for priority sampling or not.

  • Page 5: Esp Priority Format

    If the handheld operator is out of the vehicle and their partner still in the vehicle were to key the mobile radio using the local mic, the SVR-250 will detect the local PTT and repeat the transmission to the other handhelds so that both sides of the conversation will be heard by everyone on the link.

  • Page 6: Emergency Operation

    If the user keys their handheld only once, or they key the first time for more than 1 second, the SVR-250 will cancel the call attempt and send intercept tone to the handheld operator. All of the queuing and error tones will only be sent if the handheld is not transmitting to ensure that the user hears the proper tones.

  • Page 7: Wideband/Narrowband Channels

    (12.5 kHz). In addition to changing the receiver bandwidth and transmitter modulation characteristics, the audio levels into and out of the SVR-250 are automatically adjusted so the levels at the mobile will be correct with either bandwidth selected.

  • Page 8: Installation

    Remove the jumper if the SVR-250 installation decreases local microphone audio at the mobile. J4 Used to internally tie the local mic input of the SVR-250 to the transmit audio output line which is usually connected to the mic hi line in the mobile.
  • Page 9 The SVR-250 mounts in the bracket using the four 8-32 x ¼" machine screws. Do not use longer screws to mount the SVR-250 to the bracket or circuit damage may result.

  • Page 10: Vhf Transmitter Alignment

    PTT LEDs are off. 6. Local mic repeat: If the SVR-250 is programmed for local mic repeat, key the mobile local mic and inject an audio signal into the local mic to produce 60% deviation on the service monitor connected to the mobile.

  • Page 11: Vhf Receiver Alignment

    SVR-250 Service Manual VHF Receiver 1. Receiver front end: Connect a DC voltmeter to TP1 on the SVR-250 main board. Set the service monitor connected to the SVR-250 to the generate mode, receive frequency with a 1kHz tone and 60% deviation.

  • Page 12: Uhf Transmitter Alignment

    PTT LEDs are off. 6. Local mic repeat: If the SVR-250 is programmed for local mic repeat, key the mobile local mic and inject an audio signal into the local mic to produce 60% deviation on the service monitor connected to the mobile.

  • Page 13: Uhf Receiver Alignment

    SVR-250 Service Manual UHF Receiver 1. Receiver front end: Connect a DC voltmeter to TP1 on the SVR-250 main board. Set the service monitor connected to the SVR-250 to the generate mode, receive frequency with a 1kHz tone and 60% deviation.

  • Page 14: 700/800/900Mhz Transmitter Alignment

    PTT LEDs are off. 6. Local mic repeat: If the SVR-250 is programmed for local mic repeat, key the mobile local mic and inject an audio signal into the local mic to produce 60% deviation on the service monitor connected to the mobile.

  • Page 15: 700/800/900Mhz Receiver Alignment

    700/800/900 MHz Receiver 1. Receiver front end: Connect a DC voltmeter to TP1 on the SVR-250 main board. Set the service monitor connected to the SVR-250 to the generate mode, receive frequency at .5μV RF output with a 1kHz tone and 60% deviation.
  • Page 16 SVR-250 Service Manual Communications Monitor A Mobile Radio Interface Cable SVR-250 Communications Monitor B Figure 4 Page 16...

  • Page 17: Programming

    Programming Using the Software The SVR250CPS personalization software is used to program the SVR-250 for all of the operating parameters and options. The software is compatible with Windows 2000 and later operating systems The software is menu driven and on-line help is available at any time by clicking the left mouse button on the HELP icon on the right side of the tool bar.

  • Page 18: Common Data

    Tx Audio: If the mobile Tx audio from the SVR-250 to the mobile is connected after pre-emphasis, select Flat response. If connected before pre-emphasis or to the mic input, select De-Emp. Rx Audio: If the Rx audio from the mobile to the SVR-250 is connected to the discriminator or before de-emphasis, select Flat response.

  • Page 19: Channel Data

    Rx Code. If Dual Tone mode is enabled, the Tx Code must match the secondary code. Lock Tone: This is the tone burst first transmitted when the SVR-250 is enabled and sent every 10 seconds if priority mode is selected. The tone must be the same in all vehicular repeaters in the system.

  • Page 20: Transfer

    Receive: Uploads the current configuration from the SVR-250. The program will prompt you to make the FY-4 connection before uploading. Download takes approx 1 second. Com Port: Selects the serial port to use for uploading and downloading between the PC and the SVR-250. Comm ports 1-8 are supported.

  • Page 21: Ars-250 Programming

    The ARS-250 is a 16 channel auxiliary scanning receiver that provides mobile COR to the SVR-250 logic in half duplex systems that do not repeat car to car. The ARS-250 mounts inside the SVR-250 extrusion and is programmed to the mobile transmit frequency. When the SVR-250 is at non-priority status and a portable-to-base repeat condition exists, the ARS-250 COR output is sampled rather than the mobile COR.

  • Page 22: Flash Programming

    SVR250.cfg file. The FLIP software will automatically establish communications with the IC in the SVR-250. If it does not, wait until it times out, click OK to close the error message, check the com port, cable etc., and start at the beginning of step 1. When FLIP is successful, it will populate the device data fields on the right side of the PC screen.
  • Page 23 SVR-250 Service Manual Notes: This page intentially left blank Page 23...

  • Page 24: Theory Of Operation

    SVR-250 Service Manual Theory of Operation Receiver: The receiver is a double-conversion superheterodyne type, designed for narrow band FM reception. The first local oscillator is derived from the frequency synthesizer. The second LO is crystal controlled. RF Stage: The incoming RF signal from the antenna jack is directed to the first RF bandpass filter to improve selectivity and then to the input of the RF amplifier.
  • Page 25 Transmit audio path: Receiver audio from the mobile is input on pin 6 of P1 and routed to op amp U16B; RV5 sets the sensitivity. The output of U16B goes to the mic amp portion of U10; PC programming of the SVR-250 provides flat response or +6db/octave pre-emphasis.

  • Page 26: Parts List Main Pcb

    SVR-250 Service Manual Parts List Reference Description Part # C1,C2,C7 ................6.8μFd 16V tantalum chip capacitor .. 1610-25-6685 C3-C5,C13-C16,C23-C27 ..........1μFd chip capacitor ......1010-02-5104 C6,C20-C22 ..............100μFd elctrolytic cap ......1400-08-7107 C8,C9,C12,C32-C34 ............2.2μFd tantalum chip capacitor ..1610-04-6225 C10,C11 ................
  • Page 27 SVR-250 Service Manual R52 ................... 68 Ohm chip resistor ......2010-02-5680 R53,R68 ................1.0K chip resistor ........ 2010-02-5102 R54,R55 ................620 Ohm 1206 chip resistor ....2010-04-5621 R65 ................... 15K chip resistor ......... 2010-02-5153 R67 ................... 470 Ohm chip resistor ......2010-02-5471 S2,S3 .................

  • Page 28: Parts Locator Main Pcb

    SVR-250 Service Manual Page 28...

  • Page 29: Front Panel Assembly

    SVR-250 Service Manual Front Panel Assembly Reference Description Part # DS301 ................8 LED Multi-Color Display ....4001-08-0200 DS302 ................2 Digit 7 Segment LED Display ..4012-02-0704 P301 .................. 5 Conductor 4" cable 2mm ....7504-04-0504 P302 .................. 6 Conductor 4" cable 2mm ....7504-04-0604 RV304 ................
  • Page 30 Jack Pyramid Communications Pyramid Communications Pyramid Communications (714) 901-5462 Fax: 901-5472 (714) 901-5462 Fax: 901-5472 (714) 901-5462 Fax: 901-5472 2N4401 2N4401 SVR-250 Controller Board SVR-250 Controller Board SVR-250 Controller Board Size Size Size CAGE Code CAGE Code CAGE Code DWG NO...
  • Page 31 C104 C104 C105 C105 C108 C108 100p 100p 100p 100p OSCIN PYRAMID COMMUNICATIONS PYRAMID COMMUNICATIONS PYRAMID COMMUNICATIONS 15182 Triton Lane #102 15182 Triton Lane #102 15182 Triton Lane #102 470K 470K TCXO1 TCXO1 Huntington Beach CA 92649 Huntington Beach CA 92649 Huntington Beach CA 92649 12.8 MHz...
  • Page 32 470K 470K 12.8 MHz 12.8 MHz 220K 220K LM321 LM321 PYRAMID COMMUNICATIONS PYRAMID COMMUNICATIONS PYRAMID COMMUNICATIONS 15182 Triton Lane #102 15182 Triton Lane #102 15182 Triton Lane #102 Huntington Beach CA 92649 Huntington Beach CA 92649 Huntington Beach CA 92649...
  • Page 33 BISW C78 - C83 100p 100p FOUT C23 - C25 100p 100p OSCIN 470K 470K PYRAMID COMMUNICATIONS PYRAMID COMMUNICATIONS PYRAMID COMMUNICATIONS Huntington Beach CA 92649 Huntington Beach CA 92649 Huntington Beach CA 92649 2N4403 2N4403 5VDC 330K 330K (714) 901-5462 Fax: 901-5472...
  • Page 34 470K 2N4403 2N4403 330K 330K 5VDC 12.8 MHz LM321 LM321 PYRAMID COMMUNICATIONS PYRAMID COMMUNICATIONS PYRAMID COMMUNICATIONS Huntington Beach CA 92649 Huntington Beach CA 92649 Huntington Beach CA 92649 (714) 901-5462 Fax: 901-5472 (714) 901-5462 Fax: 901-5472 (714) 901-5462 Fax: 901-5472...
  • Page 35 470P 470P MIC5205-3 MIC5205-3 100P 100P 100p MAX3392 MAX3392 ADF4252 ADF4252 Pyramid Communications Pyramid Communications Pyramid Communications 470P 470P 15182 Triton Lane #102 15182 Triton Lane #102 15182 Triton Lane #102 MIC5205-5 MIC5205-5 Huntington Beach CA 92649 Huntington Beach CA 92649...
  • Page 36 1N65 1N65 R7,R8 R9,R10 R12,R14 VCO1 750-840 810-900 840-950 Pyramid Communications Pyramid Communications Pyramid Communications 15182 Triton Lane #102 15182 Triton Lane #102 15182 Triton Lane #102 Huntington Beach CA 92649 Huntington Beach CA 92649 Huntington Beach CA 92649 (714) 901-5462 Fax: 901-5472...

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