Motrola GR1225 Repeater Help

[mwvernon]

I am looking into purchasing a Motorola GR1225 16 Channel repeater. My question is if you can only program the internal duplexer for one frequency split, then what can you use the other 16 channels for?

 

[kayn1n32008]

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First the duplexer is tuned not programmed. Second, if tuned properly, you can pass multiple frequencies. Years ago, I tuned a couple sets of Vhf mobile duplexers to pass 13 unique pairs for 2 portable 'go' repeaters, granted they were spread over less than 1MHz. All repeater Transmit frequencies were at 153MHz and 5.26MHz higher for the repeater receive. Yes it is possible to use multiple channels on a repeater, BUT all channels MUST be the same offset, and pretty close together.

 

[trlrdrdave]

I'm not saying that this is impossible, But is not normal practice. If you use 2 antennas you could program 20 pairs. But why would you want to?

 

[kayn1n32008]

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The repeaters I built were for a government agency, that used them for emergency replacement if a repeater failed, or to give coverage where they had none. The repeaters had all the same frequencies as the government network, this allowed them to use their existing subscriber equipment with out needing to program new or other frequencies. This also followed the KISS principle, less training, as the users are first responders/ government employees that use a radio, not live for radio. One antenna is ALWAYS easier than trying to figure out separation for dual antennas.