This is very interesting and useful. It looks a little bit like a Borland app but I expect it is not.
I am currently sweeping my 2.7kHz filter but I expect the limit will be the phase noise of the synth. I may try using my 10MHz reference instead. I found a gain of 100 was about right for my K3 on 28MHz with -30 dBm input. While the program is excellent there are one or two issues I have noticed. The first time I tried the linearity check I had the volume up - loud mistake! It takes a very long time to sweep a filter this way, it may be better to implement some form of variable sweep based say on the difference between the last value. One tends to want detail in the passband but not so much in the stopband. One thing we are missing is phase response (AM/PM), I would be interested to know if there is any way to measure this with a sound card. There are a few rough edges, it is easy to crash if you enter nothing into a checkbox that is not explicitly checked. The stop button does not always get enough attention paid to it. (Application->ProcessMessages ?) Mike -- View this message in context: http://n2.nabble.com/Filters-for-weak-signal-160-meter-CW-and-crowded-contest-bands-tp2154048p2177829.html Sent from the Elecraft mailing list archive at Nabble.com. _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
