Re: APF For K3
Posted by
Dale Parfitt-3 on
Oct 25, 2010; 10:24pm
URL: http://elecraft.85.s1.nabble.com/APF-For-K3-tp5671688p5672668.html
> 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/elecraftHelp:
http://mailman.qth.net/mmfaq.htmPost: mailto:
[hidden email]
This list hosted by:
http://www.qsl.netPlease help support this email list:
http://www.qsl.net/donate.html