Soundcarc modes have one large problem used this way; harmonics of low tones may produce a multiple (and unauthorized) signal in the passband. That's a good reason to use tones near the high frequency cutoff. And that's not counting transmit IMD.
Cortland KA5S > [Original Message] > Date: Sat, 20 Sep 2008 00:40:38 -0600 > From: "Bob Cunnings" <[EMAIL PROTECTED]> > Subject: Re: [Elecraft] K3 PSK31 with Digipan > To: elecraft@mailman.qth.net > Message-ID: > <[EMAIL PROTECTED]> > Content-Type: text/plain; charset=ISO-8859-1 > > It finally dawned on me that the 6kHz filter could be put to work for > soundcard modes in both transmit and receive by enabling ESSB and > using USB or LSB instead of DATA A. Indeed, it works just fine with BW > set to 4kHz and shift adjusted to put center at 1800 or so. With DM > 780 set to max width (3.9 kHz) the waterfall just about fills the > screen and there's almost 3.5 kHz bandwidth for transmit and receive. > This gives a wider field for casual point and click PSK31 operation - > nice for a simple setup like mine where there is no computer control > of the radio, and I want to keep the knob twirling on the rig to a > minimum (the interface consists only of 2 audio cables between laptop > and rig with VOX keying. TX EQ flat, AGC and compressor disabled of > course). > > Bob NW8L _______________________________________________ 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
