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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

Summary of content (25 pages)

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SVR-250 Service Manual Table of Contents Foreword ............................................................................................................................................... 2 Specifications ........................................................................................................................................ 3 Functional Description..........................................................................................................................
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SVR-250 Service Manual Foreword Scope of this manual This manual contains the specifications, functional description, operating instructions, schematic, parts locator and parts list for the SVR-250 synthesized vehicular repeater. This manual is intended for use by qualified service technicians to aid them with installation, interfacing, alignment and trouble shooting of the SVR-250 when used with other land mobile radios.
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SVR-250 Service Manual Specifications Transmitter: VHF UHF 700/800/900 MHz Frequency Range: 150-174 MHz Rf power out: Spurious emissions: Freq stability -30°~+60°C: Modulation: Hum and Noise: Audio response (300-3kHz): Audio distortion: Local mic sensitivity: FCC Type Acceptance: Industry Canada Approval: 250mW - 2W -50dBc 1.5 PPM 16K0F3E /11K0F3E -40/-37dB (25/12.
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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.
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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. They will then begin to decrement their priority counters until one of them reaches the priority status and begins repeating the transmission.
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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. The user then keys their handheld to speak on the voice channel.
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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. VHF channels can be in 5 or 6.25kHz steps on a per channel basis. UHF is programmed in 12.5kHz steps. 700/800/900 MHz are programmed in 6.25kHz steps. 700 and 900 MHz are only available as narrow band (12.5 kHz).
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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. If J1 is installed, output amp U1A will have an adjustment range of 0-100 mVPP.
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SVR-250 Service Manual Pin 4: Green Pin 5: Red Pin 6: Yellow Pin 7: Violet Pin 8: Brown Pin 9: Gray Mobile PTT output. Connect to mic PTT on the mobile radio, or a line that goes active low to transmit. Pin 4 is an open drain output rated at 2A at 15VDC. 12 VDC input. Connect to the radios 12V switched supply or a point capable of supplying at least 1.5A of current. Mobile receive audio. Connect this line to the mobile receive audio path before the volume control.
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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. Refer to figure 1 for alignment points.
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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. Adjust L1-L5 on the RF board for a maximum reading at TP1. 2. Repeater squelch: Adjust the service monitor RF output for .5μV. Adjust RV9 on the SVR-250 main board so the repeater COR LED is just on.
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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. Refer to figure 2 for alignment points.
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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. Adjust BPF1 and BPF2 on the RF board for a maximum reading at TP1. 2. Repeater squelch: Adjust the service monitor RF output for .5μV. Adjust RV9 on the SVR-250 main board so the repeater COR LED is just on.
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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. Refer to figure 3 for alignment points.
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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. Confirm a reading of 1VDC ±.2VDC at TP1. 2. Repeater squelch: Adjust the service monitor RF output for .5μV. Adjust RV9 on the SVR-250 main board so the repeater COR LED is just on. Decrease the service monitor RF output to .
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SVR-250 Service Manual Communications Monitor A Mobile Radio Interface Cable SVR-250 Communications Monitor B Figure 4 Page 16
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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.
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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. Changing bands resets all data to default values (confirmation req.) COR Polarity: Determines if the COR signal from the mobile is active high or low.
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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. These can be selected on a per channel basis, but cannot be mixed with a channel.
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SVR-250 Service Manual Transfer Send: Downloads the current configuration to the SVR-250. The program will prompt you to make the FY-4 connection before downloading. Download takes approx 2 seconds. 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.
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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. 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.
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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.
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SVR-250 Service Manual Notes: This page intentially left blank Page 23
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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. The output of the RF amplifier is then presented to a second bandpass filter.
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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. Q3 output is switched 12VDC and is presented to audio amp U6, and voltage regulators U7 and U8. Bias voltage for the op-amp circuits is provided by U10 pin 10 and buffer amp U9D.