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" <
[hidden email]>
> Subject: Re: [Elecraft] K3 PSK31 with Digipan
> To:
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> Message-ID:
> <
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> 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
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