RELM Communications Inc SRU50ABC ユーザーズマニュアル
S Series Repeater USER MANUAL
©RELM Communications Inc. Revision 1.0
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Receiver Module Description
The Receiver module features the same advanced synthesizer and wide bandwidth as the exciter. Only the front end
bandpass filter and VCO need to be changed in order to support different frequency bands, resulting in significant
flexibility and end-user cost savings. The custom built front end bandpass filter has a wide no-adjust bandwidth
equal to the band allocation. The receiver has extremely high sensitivity while maintaining excellent intermodulation
immunity and adjacent channel rejection. A double first IF provides excellent rejection to common known spurious
responses. High blocking of over 120dB typical ensures that strong interfering signals do not desensitize the receiver
when receiving weak signals.
bandpass filter and VCO need to be changed in order to support different frequency bands, resulting in significant
flexibility and end-user cost savings. The custom built front end bandpass filter has a wide no-adjust bandwidth
equal to the band allocation. The receiver has extremely high sensitivity while maintaining excellent intermodulation
immunity and adjacent channel rejection. A double first IF provides excellent rejection to common known spurious
responses. High blocking of over 120dB typical ensures that strong interfering signals do not desensitize the receiver
when receiving weak signals.
Power Amplifier Module Description
The PA is very compact and efficient for high reliability and low cost. The heatsink has minimal temperature rise
even under continuous operation, this also ensures the best MTBF obtainable for a practical design. A low loss 13
element elliptical low pass filter ensures that any harmonics remain below -100dBc.
even under continuous operation, this also ensures the best MTBF obtainable for a practical design. A low loss 13
element elliptical low pass filter ensures that any harmonics remain below -100dBc.
Key Features and Advantages
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Exceptional system performance.
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Modular internal construction.
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Software or hardware configurable.
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50 Watt continuous transmitter (30 Watt above 800 MHz).
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Programming via RS232.
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256 channel capacity.
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Optional CTCSS.
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Paging capability.
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VF filters and processing can be bypassed.
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Fast mute.
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20mS Rx and Tx. 4mS selectable.
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Front panel display.
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Digital squelch compatible.
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Wide band Rx and Tx.
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Isolated PTT input.
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Digitally controlled and corrected Tx deviation.
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Programmable Tx power.
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Direct FSK or paging compatible.
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VSWR and Temp protection.
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Compact 2RU case.
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13.8 Volt operation.
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Available in continuous coverage from 66-88MHz, 135-520MHz and 805-960MHz.
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Surface mount technology used throughout.