[Elecraft] K3 and PSK31 Data Mode and ESSB

[Joe Subich, W4TV]

> 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).

Absolutely!  I've been playing with an RFSpace SDR-IQ and a beta 
version of Spectravue.  It provides panadapter and waterfall that 
can be set anywhere from 1 to 190 KHz wide ... clicking on it will 
tune the K3 to put the narrow filters in the right place.  N8LP's 
LP-Pan and PowerSDR should also be able to provide the same 
capability. 

SDR-IQ and SpectraVue work very well with microHAM Router since 
SpectraVue's new external panadapter function can use Router's 
2nd CAT port to control the K3 at the same time as a logger and 
digital mode package like DXLab Suite or HRD/DM780. 

73, 

   ... Joe, W4TV 
 


> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Erik N Basilier
> Sent: Sunday, March 22, 2009 5:52 PM
> To: Jim Brown; elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3 and PSK31 Data Mode and ESSB
> 
> 
> 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
> >
> 
> 
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