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  #21 (permalink)  
Old 06-13-2018, 1:12 AM
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Originally Posted by pboyd View Post
No, this is in the middle of nowhere there aren't any commercial systems that cover this area. I've run my SDR setup looking for anything around the frequencies in use and didn't see anything. Is there something specific I should be looking for besides that?
De-sense issues can be tricky, the signal does not have to be that close in frequency. (I have had 146 MHz interfere with lower VHF TV stations.)

Look for any strong signals, they could be enough to mess with your AGC. It sounds like you will need to do your checks during the event, in case it is something that is at the event. It might be some sort of spurious emission from equipment.

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  #22 (permalink)  
Old 06-13-2018, 12:29 PM
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I don't really have that much control over what other people bring to the event. What can I do to harden my system against this kind of issue rather than waiting a year to see if I can find something causing it and trying to get it shutdown.
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Old 06-13-2018, 2:24 PM
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I don't really have that much control over what other people bring to the event. What can I do to harden my system against this kind of issue rather than waiting a year to see if I can find something causing it and trying to get it shutdown.
Your own system is likely causing you some issues (especially if one repeater is in the 451-454 MHz range and the other in 461-464 MHz range) as well as other systems that may be in the area during the event. Best way to harden against your issues is to either put your repeaters on two separate towers (separate by 300-500 ft), upgrade to band-pass, band-reject duplexers or use an receive multicoupler/transmit combiner system.
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