At 3/15/2007 09:48 AM, you wrote: > > Then there is the adjacent channel interference they create. There > > is nothing you can say that will convince me that any repeater can > > solve that problem. > >Wide doesn't always equal an interference problem.
..if your channel spacing is 20 or 25 kHz. At 12.5 or 15 kHz spacing, an overdeviated signal is going to put a significant amount of energy into the adjacent channels, & if there's something there, interference is very likely. It's true that it's quite difficult to get all the users' radios down to less than 5 kHz deviation, so deviation limiting & post-limiter low pass filtering is important on repeaters operating on narrow spaced channels. On 2 meters in SoCal the standard is 4.2 kHz peak deviation & 20 dB down @ 4.4 kHz modulating frequency. Yes it hurts the audio fidelity a bit but ya gotta give up something when you go below 20 kHz channel spacing. Bob NO6B
