Don, Thanks very much for the response. I actually did get up to speed on Spectrogram, and I'm very happy with the results. Now, the CW signal remains stationary in pitch, and jumps out at me as I invoke successively tighter filters. Spectrogram is also fun!
The problem that previously prevented me from using Spectrogram was that I didn't know that getting the K2's audio into the PC was as simple as running a cable from the K2's headphone jack to the PC's microphone jack. Instead, I envisioned having to have an interface circuit of some kind and wire up a USB connector. As a side benefit, now that I have receiver audio going into my computer, my next project is to figure out how to decode PSK-31 signals. Cool stuff! 73, Jeff WB5GWB ----- Original Message ----- From: "Don Wilhelm" <[EMAIL PROTECTED]> To: "Bill Coleman" <[EMAIL PROTECTED]>; "Jeff" <[EMAIL PROTECTED]> Cc: <[email protected]> Sent: Sunday, September 17, 2006 12:06 AM Subject: RE: [Elecraft] K2 Crystal Filter Alignment Questions > Jeff, > > Let me add my 2 cents worth: > > First, if you have been attempting to align your filters by trial and error, > you may have the wrong sideband set. > > Secondly, a shift of 20 Hz or so is to be expected because of the DAC > resolution - if your shift is any more than 20 Hz, it can be corrected by > proper filter adjustment. > > Third, I don't understand why you are shying away from Spectrogram - it is > by far the easiest method of correctly setting the filter passbands. > > Forth, If you have been arbitrarily moving the BDO settings 'by ear', it is > quite possible that you have the BFOs set to the wrong sideband. A good > starting point is the settings in the manual (either the K2 manual or the > KSB2 manual. Shift the sideband as required from these settings, but do not > go too far - going far from those values will result in the BFO being set to > the incorrect sideband. > > I strongly suggest that you download Spectrogram and use that to set your > filters - see the note from Tom Hammond. Tom's websote contains the last > freeware version of Spectrogram and instructions for setting it up and using > it to align the K2 filters - try it, I assure you that you will not be > disappointed in the results. > > 73, > Don W3FPR _______________________________________________ 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
