I would recommend first using a spectrum analyser at the TX site to make sure the TX is not generating the noise. If you see the noise at the TX site, determine if internal to the TX or external. If the site is clean proceed to the RX site.
At the RX site, check with a spectrum analyser to see if the noise only exists when the TX is on; if true you most likely have intermode involving a third source. If the RX site has the noise even when the TX is off, it may not open the squelch but is heard when a signal opens the RX squelch. If this is true, it could be something local at the RX site and is just a matter of locating the source. --- In Repeater-Builder@yahoogroups.com, "kb1we6r" <[EMAIL PROTECTED]> wrote: > > I need ideas to cure desense on a 10 meter repeater. > Details; > 1. 100KHz split, (29.66 out 29.56 in) > 2. Maxtracs on both ends, UHF link > 3. Several miles of separation > 4. Sometimes it works OK with no desense, but usually when the tx > comes up, a buzzing type of noise wipes out most signals, even ones > that were full quieting before. > 5. The buzzing sounds like powerline noise. > 6. There is some kind of wireless node nearby. > > What other types of noise generators could be exagerated by the > additon of the 10m transmitter? > > Is it possible to make a notch filter out of big hardline at 100KHz > with acceptable insertion loss? > > Would a window filter (DCI type) help with that type of noise? > ...Keith WE6R >
