[Elecraft] K3 and PSK31 Data Mode and ESSB

[Erik N Basilier]

I agree with Jim, and not just w.r.t. invading contesters but other PSK31
stations as well. The wider the waterfall, the greater the chance that 
another
station within it is stronger than the wanted station, and adversely affects
reception through receiver AGC action. The architecture with an AGC-using
radio producing audio that goes into a soundcard is a bit of a dead end,
the ultimate death of which is postponed by myths that everything will be
OK as long as nobody uses more than 20-30 W. Manual gain control
helps of course, but somewhat defeats the convenience of click-to-tune.
A better approach is to set the K3 bandwidth very narrow, and use
a panadapter to produce a waterfall that is independent of the real
receive bandwidth (and which can thus be much wider than any of the
K3 roofing filters).

73,
Erik K7TV

----- Original Message ----- 
From: "Jim Brown" <jim at audiosystemsgroup.com>
To: <elecraft at mailman.qth.net>
Sent: Sunday, March 22, 2009 9:02 AM
Subject: Re: [Elecraft] K3 and PSK31 Data Mode and ESSB


> On Sun, 22 Mar 2009 07:44:31 -0700 (PDT), Bill Strong wrote:
>
>>Once
>>generally known, this ability to operate PSK31 in ESSB with click and
>>transmit across a 3.5 kHz waterfall would I think make the K3 even more
>>attractive to data mode operators than it already is.
>
> Yes, but: another HUGE advantage of the K3 is its ability to get very
> narrow to pull very weak PSK31 (or RTTY) signals out of the noise with
> both a selectable fixed roofing filter, and a variable filter that can be
> made very narrow filter and tuned around a bit. I would think that PSK
> operators would find this quite useful for working through QRM when
> contesters forget and accidentally invade their usual haunts.
>
> 73,
>
> Jim K9YC
>