Filter selection question

Posted by n7ws on Nov 17, 2009; 12:23am
URL: http://elecraft.85.s1.nabble.com/Filter-selection-question-tp4015661.html

I received my new 400 Hz filter midway through the WAE RTTY contest and since I wasn't really contesting, took the time to install it.

I guess I'm a little underwhelmed so far, but to be fair I wanted to compare it under fire with the 2.8 KHz filter I have been using. (I expected less buckshot from out-of-the-passband adjacent signals with the narrower filter, although this may be a commentary on the lousy transmitted signals)

I continued to allow the 2.8 KHz filter to be used on data modes because if I decide to use the PSK modes, I might want the wider BW.

Problem is... when switching the crystal filters manually, the DSP bandwidth defaults to 2.8 KHz when I select the 2.8 KHz crystal filter and 400 Hz when I select the 400 Hz crystal filter, even though I may have previously reduced the Width setting to something narrower. Likewise, when in
 Data mode with the 2.8KHz filter selected, hitting "NORM" defaults to 400 Hz BW, which again selects the 400 Hz filter.

I suppose this is by design, but why can't the radio simply maintain some independence between the crystal and DSP filters?

Wes  N7WS



     
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