Table of Contents
Advertisement
Quick Links
Advertisement
Table of Contents
Related Manuals for Pyramid SVR-200 LA
Summary of Contents for Pyramid SVR-200 LA
- Page 1 VHF: 29 - 50 MHz...
- Page 2 SVR-200 Service Manual SVR-200 Vehicular Repeater This manual is intended for use by qualified technicians and includes all necessary information pertaining to the SVR-200 operation, circuit design and maintenance. Changes that occur after date of printing will be incorporated in supplemental service publications. Page 1...
-
Page 3: Safety Information
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-200 is designed to operate within all applicable Federal regulations at the time of manufacture. -
Page 4: Specifications
SVR-200 Service Manual Specifications Transmitter: Frequency Range: 29-50 MHz (29-44 MHz and 36-50 MHz) Rf power out: 250mW - 2W Spurious emissions: -50dBc Freq stability -30°~+60°C: 15 PPM Modulation: 20K0F3E Hum and Noise: Audio response (300-3kHz): Flat or +6dB/octave Audio distortion: <3% @ 60% deviation Local mic sensitivity: 300mV-5VPP... -
Page 5: Important Note
SVR-200 Service Manual Functional Description Generally, vehicular repeaters are used as mobile extenders in cross-band operation: the link is VHF Low Band 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. -
Page 6: Trunking Operation
SVR-200 Service Manual If another unit were to arrive from a different scene and it is still the active priority, there will be two active repeaters on the air when a condition to repeat exists. When one of the SVR-200s unkeys to check for handheld activity, it will detect the presence of the other active SVR-200 and increment it’s priority counter and cease transmission. -
Page 7: Installation
SVR-200 Service Manual Installation Before installing the SVR-200, ensure that the RF and repeater sections are properly aligned per the tuning instructions on pages 8-14 of this manual. Additionally, ensure that the SVR-200 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 8 SVR-200 Service Manual Pin 3: Remote enable/disable. Connect to the radio's auxiliary output or a separate switch to remotely enable Blue or disable the repeater. If this line goes high to activate the repeater, ensure that JP1 is set to the “+” position.
- Page 9 SVR-200 Service Manual Alignment Before aligning the SVR-200, ensure that the mobile radio is aligned per the manufacturer’s service procedure; Ensure that the SVR-200 is properly programmed and the jumpers are set per the previous section. In order to properly align the SVR-200, you will need two service monitors and the mobile radio that the repeater will be installed with.
- Page 10 SVR-200 Service Manual Receiver 1. Receiver IF: Connect a DC voltmeter to TP1 on the SVR-200 main board. Set the service monitor connected to the SVR-200 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 11: Mobile Radio
SVR-200 Service Manual Communications Monitor A Mobile Radio Communications Monitor B Interface Cable SVR-200 Figure 4 Page 10... -
Page 12: Using The Software
SVR-200 Service Manual Programming Using the Software The SVRCPS personalization software is used to program the SVR-200 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 13 SVR-200 Service Manual Mobile COR polarity: Determines if the COR signal from the mobile is active high or active low. Radio Type: Select either conventional or trunking. If a trunking mobile is selected, the SVR-200 will go through the voice channel acquisition procedure during portable-to-base repeat mode. On-air polarity: Select either active high or active low.
-
Page 14: Control Board
SVR-200 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 15 SVR-200 Service Manual Receive audio path: Receiver audio from the transceiver module is input on P2 pin 13 and presented to U5 pin 10 and pin 16. Pin 10 is the input of the receiver highpass filter to remove any sub-audible signals before being output on pin 11 and sent to U4 for receiver audio processing.
- Page 16 SVR-200 Service Manual P1.5 Serial clock line output. Serial data that is sent to the PLL, the E²PROM and the audio processor chips are clocked by each low-high-low transition on this line. P1.6 Serial data output. Data sent to U10, U4 and U5 are output on this line and clocked by P1.5. P1.7 Data input to the microprocessor.
- Page 17 SVR-200 Service Manual Test input, active low. Shorting J3 puts the microprocessor into test mode for alignment purposes. If shorted at power up, the receiver will operate open squelch mode and audio will be heard at the local speaker port regardless of carrier or tone input to the receiver. Although alignment is normally done with the RSSI output at TP1, a Sinad reading can be obtained using this mode of the test input.
- Page 18 SVR-200 Service Manual Notes This Page Intentionally left blank Page 17...
-
Page 19: Parts List
SVR-200 Service Manual Parts List Reference Description Part # C1,C5,C6,C9,C10,C12,C15,C18,C35,C37 ......1µFd chip capacitor ......1010-03-5104 C2 ..................22µFd 16V tantalum chip capacitor ..1610-25-6226 C3,C27 ................047µFd chip capacitor ......1010-03-5473 C7,C8,C13,C41 ..............220pFd chip capacitor ......1010-03-5221 C11 ..................0033µFd chip capacitor ...... 1010-03-5332 C16 .................. - Page 20 SVR-200 Service Manual R50,R77-R80 ..............15K chip resistor ......... 2010-03-5153 R54-R62,R64 ..............330 Ohm chip resistor ......2010-03-5331 R68,R69 ................4.7K chip resistor ........ 2010-03-5472 R43 ..................68K chip resistor ......... 2010-03-5683 R67 ..................8.2 Ohm 1W resistor ......2000-10-5829 U1 ..................
- Page 22 5/25/2005 04:12:57p f=1.35 n:/eagle/projects/SVR200I/SVR200.BRD...
- Page 23 RxAudio RSSI RX5V S-227-5005 S-227-5005 100K 100K S-227-5008 S-227-5008 MC3371D MC3371D 100p 100p 180nH 120nH AUDIO QUAD 560p 560p 3.9uH FILT IN DECPLE FL1B1 FL1B1 FL1A1 FL1A1 270p 270p 220p 220p 100p 100p FILT OUT DECPLE 100p 100p 220nH 270nH 220nH 25139-U72 25139-U72...