Nick, I wholeheartedly second this. I followed the manual and noticed the same thing you did. When I hooked up Spectrogram I could clearly see that the narrower filters were off center. I adjusted while watching the Spectrogram screen and things sound *much* better.
Craig AC6NN -------------- Original message ---------------------- From: "Don Wilhelm" <[EMAIL PROTECTED]> > > Nick, > > Sometimes the filters (particularly the narrower ones) do not respond well > to the initial numbers in the manual because the filter center may be > shifted a bit due to the particular set of matched crystals supplied. I > don't think you have a problem. > > There is a solution, and that is called 'Spectrogram', which will provide a > visual display of the filter shape and positioning on a computer screen. > Download the last freeware version (5.17) of Spectrogram from www.n0ss.net > and look at the instructions for using it on Tom's website or the Builder's > Resource page of the Elecraft website. > > You could let the filter alignemnt wait until you have the rest of the K2 > built and the KSB2 (if you added that) installed and then you can do a > complete dial calibration and filter alignment. Instructions for doing that > are on my website http://w3fpr.qrpradio.com > > 73, > Don W3FPR > > > -----Original Message----- > > > > > Thrilled to get my K2 working on 7 MHz receive but I seem to have > > a problem with filter settings. > > Everything has checked out according to the book - no problems at > > all (even my home-wound coils seem to work!!) > > I have set up the filters exactly according to pages 88 and 89. > > On Filter 1 the rx sounds great - plenty of gain, clean signals. > > On the other 3 filters it sounds like I am listening through a > > dense fog - I can tell the bandwidth is far narrower than F1 but > > signals are weak and it sounds as if the filters are overlapping > > each other (if you know what I mean). I have checked settings > > again and all look OK. Does anyone recognise this problem please? > > I am reluctant to proceed until I have sorted it out. > > 73 Nick G3RWF > > > -- > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.5.446 / Virus Database: 268.18.11/723 - Release Date: 3/15/2007 > 11:27 AM > > _______________________________________________ > Elecraft mailing list > Post to: [email protected] > 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 _______________________________________________ Elecraft mailing list Post to: [email protected] 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
