Hi Ken, Assuming you have the crystal filter adjustment where you want it in Spectragram, they tend to not to be as brick wall as the DSP, but still are very good for a single adjustable crystal filter. However, the crystal filters are in the IF and they are needed to cut out adjacent interference that would pulse the AGC like crazy and make the signal you want to hear unreadable if you were only using the audio DSP filters. (At least I think that’s how the agc works).
So for operating you need to start wide open, and then you need to start narrowing the bandwidth first using the Xfil settings. Once you narrow it down so the adjacent interference is not causing the desired signal to degrade, then you can add a bit of the DSP filtering to sharpen up the skirts. I have the narrower dsp settings with a lot of audio boost so they really pop out of the background. That’s how I do it. Both the crystal (IF) and DSP (AF) have a purpose and individual advantage, but should really be used together. Steve, W2MY -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.344 / Virus Database: 267.11.14/128 - Release Date: 10/10/2005 _______________________________________________ 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
