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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
Page 1
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Summary of Contents for Pyramid Communications SVR-250V
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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
Component changes, additions and deletions may occur in the circuit design to improve operation and will be reflected in future releases of this service manual. Specifications and circuit changes are subject to change without prior notice or obligation by Pyramid Communications. Safety Information The SVR-250 is designed to operate within all applicable Federal regulations at the time of manufacture. -
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 Spurious emissions: -50dBc -50 dBc... -
Page 4: Functional Description
SVR-250 Service Manual Functional Description Generally, vehicular repeaters are used as mobile extenders in cross-band operation: the link is VHF/UHF/800 MHz simplex and the mobile is Lo-band, VHF, UHF or trunking. In-band operation is possible, but care must be taken to prevent interference between the mobile's higher power transmitter and the repeater receiver. Proper frequency selection and antenna placement are important even in cross-band operation, but especially for inband use. -
Page 5: Esp Priority Format
SVR-250 Service Manual Even though the other SVR-250s are not at priority status, they will continue to monitor the channel for activity. If the priority unit were to leave the scene or become disabled, the other units will detect the condition to repeat and determine that there is no priority unit repeating the transmission. -
Page 6: Emergency Operation
SVR-250 Service Manual When the SVR-250 detects that the mobile is transmitting, it will continue to monitor the on-air line until the transmitter remains keyed for at least 250mS to ensure that the radio is not handshaking or retrying. After successful acquisition of a voice channel, it will continue to hold the mobile PTT active for 2 seconds and transmit a go-ahead blip to the handheld operator. -
Page 7: Wideband/Narrowband Channels
SVR-250 Service Manual Wide Band / Narrow Band Channels The SVR-250 can be programmed for Wide/Narrow band operation on a per channel basis. Wide band operation is 25kHz for UHF and 800 MHz, 30kHz for VHF. Narrow band is 12.5kHz for UHF and 800 MHz, 15kHz for VHF. -
Page 8: Installation
SVR-250 Service Manual Installation Before installing the SVR-250, ensure that the RF and repeater sections are properly aligned per the tuning instructions on pages 10-15 of this manual. Additionally, ensure that the SVR-250 jumpers are properly configured for use with the particular mobile radio that it will be connected to: J1 Controls the maximum drive level of the transmit audio output to the mobile radio. - Page 9 SVR-250 Service Manual Pin 4: Mobile PTT output. Connect to mic PTT on the mobile radio, or a line that goes active low to transmit. Green Pin 4 is an open drain output rated at 2A at 15VDC. Pin 5: 12 VDC input.
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Page 10: Vhf Transmitter Alignment
SVR-250 Service Manual Alignment VHF Before aligning the SVR-250, ensure that the mobile radio is aligned per the manufacturer’s service procedure; Ensure that the SVR-250 is properly programmed and the jumpers are set per the previous section. In order to properly align the SVR-250, you will need two service monitors and the mobile radio that the repeater will be installed with. -
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. Adjust the RF output of the monitor for a 1VDC reading at TP1. -
Page 12: Uhf Transmitter Alignment
SVR-250 Service Manual Alignment UHF Before aligning the SVR-250, ensure that the mobile radio is aligned per the manufacturer’s service procedure; Ensure that the SVR-250 is properly programmed and the jumpers are set per the previous section. In order to properly align the SVR-250, you will need two service monitors and the mobile radio that the repeater will be installed with. -
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. Adjust the RF output of the monitor for a 1VDC reading at TP1. -
Page 14: 700/800/900Mhz Transmitter Alignment
SVR-250 Service Manual Alignment 700/800/900 MHz Before aligning the SVR-250, ensure that the mobile radio is aligned per the manufacturer’s service procedure; Ensure that the SVR-250 is properly programmed and the jumpers are set per the previous section. In order to properly align the SVR-250, you will need two service monitors and the mobile radio that the repeater will be installed with. -
Page 15: 700/800/900Mhz Receiver Alignment
SVR-250 Service Manual 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...
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Page 17: Programming
SVR-250 Service Manual 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
SVR-250 Service Manual Common Data File Name: 15 character name for this profile stored in E²PROM. Number of Channels: Select 1-20 channels Model: Select either simplex or Duplex. Duplex operation requires hardware and firmware changes and is not field upgradable. Band: Select the frequency band to match your SVR-250. -
Page 19: Channel Data
SVR-250 Service Manual Channel Data Note: The number of channels available is determined by the setting in Common Data. Tx and Rx Frequency: Enter the Transmit and Receive frequencies for each channel. The frequency must be in the range for the band selected under Common Data and will be rounded to the nearest channel step. Squelch Type: Select either CTCSS, DCS or Inverted DCS. -
Page 20: Transfer
Help Icon on the tool bar. Additional help menu items: About: Gives you version information about the software and contact information for Pyramid Communications. Remote Tech Support: Remote Tech Support is a utility that allows the Customer Service Technicians at Pyramid Communications to remotely access your computer via the internet in order to troubleshoot any problems you might be having with the software or to assist you in operation of the program. -
Page 21: Ars-250 Programming
SVR-250 Service Manual 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. -
Page 22: Flash Programming
SVR-250 Service Manual Flash Programming The SVR-250 uses an Atmel 89C51RB2 microprocessor which contains the operating system. The chip can be reprogrammed in-circuit using Atmel's FLIP software and a PC running Windows 2000 or XP. The FLIP software can be downloaded from Pyramid's web site: www.pyramidcomm.com/support Warning- Do not attempt to re-flash the SVR-250 μP unless you are familiar with operation of the SVR-250 and reasonably competent using Windows software. - Page 23 SVR-250 Service Manual Notes: This page intentially left blank Page 23...
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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 SVR-250 Service Manual Control Board Power Supply: DC power comes from the mobile radio via P1 pins 1 and 5. Fuse F1 and MOV VAR1 provide over current and voltage spike protection. Q3 is the remote enable/disable pass switch, controlled by Q1 and Q2 via P1 pin 3.
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