coax story
The other day I looked at the KB3OKL repeater and saw a short piece of RG-58 going from the receive preamp to the duplexer. It probably came from a hamfest years ago. Anyway, I removed it and used a 3 foot RG-213. Well, the receive sensitivity went up, and the desense went down. So, the lesson, at least for VHF, is to use quality and “thick” coax throughout, even the short runs where the dB line loss is not really a factor. It is too easy for RF to sneak out of and into cheap, thin poorly shielded, cable. And of course many of those jumpers that are around have connectors that are not properly soldered.
Steve
WA4BVO