> When dealing with very weak signals in the absence of really strong QRM, I > use the widest bandwidth possible for just that reason. At least 2.8 kHz > is > typical for me and I almost never drop below 1 kHz. The more pink or > white-ish the noise, the easier it is to hear a very weak CW signal down > in > it. > > That's why I vastly prefer the notch filter to help my gray matter filter > in > case a really strong signal appears in the bandpass. > > On stronger signals mixed in a lot of heavy QRM I'll crank in the > bandwidth > so the desired signal is the only one I hear. Then I can pretend I'm > listening to a code practice oscillator - it sure doesn't sound like a > "radio", Hi > > Now that Wayne's implementing APF I'm curious to see how it sounds. I'm > prepared to be astonished if it sounds any different than a decent active > audio filter with some gain at the center frequency. > > Ron AC7AC > Hi Ron, A lot of my activity is on 1296MHz EME where the background noise is extremely consistant. I found the APF on the IC-7700 to be useless, but interestingly the audio peak function on my Alpha Delta VRC (Variable Response Console) consistantly pulls weak CW signals out that the narrow roofing and/or DSP filters do not. Visitors to my station have noticed the same effect- and have gone searching for a VRC for their EME station. Reports here on the reflector that it is possible for an APF to function very well are encouraging- so I too look forward to its implementation.
Dale W4OP ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
