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AW: Hailing channel and intermodulation suppression

"siegfried jackstien" <siegfried.jackstien@...> #464 Repeater builders use a highpass lowpass combination (procom 70/6 or similar) to transmit and receive on the same antenna ... now my rough guess is that you could add such a filter to your antenna input and can transmit on one frequency without desensing on the other frequency Dg9bfc Sigi toggle quoted messageShow quoted text -----Ursprüngliche Nachricht----- Von: UniversalDigitalRadio@yahoogroups.com [mailto:UniversalDigitalRadio@yahoogroups.com] Im Auftrag von Tom Hayward Gesendet: Samstag, 22. Juni 2013 03:34 An: UniversalDigitalRadio@yahoogroups.com Betreff: [UniversalDigitalRadio] Hailing channel and intermodulation suppression I'm trying to embrace the concept of A Hailing Channel for Packet Radio, but I've run into an engineering roadblock. I am assuming the "hailing channel" will be something like 440.800 MHz APRS, and the 56k data transfer channel will be 430.9 MHz. These are 10 MHz apart. How can I support this on a crowded site that requires a [normally low bandwidth] intermodulation suppression panel (isolator / low pass filter)? With the independent TX/RX connector option, is the internal TX/RX relay preserved? I'd hate to try to implement an external TX/RX relay with <10ms turnaround time. Tom KD7LXL
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