[Elecraft] KX3 PBT - and K3?

[Wright, Robert]

On the K3 (probably common code with the KX3) the bandwidth knobs also seem to be ignored during transmit.  I often use the K3 for PACTOR which is rapidly changing between transmit and receive.  Sometimes I find I have not properly set the bandwidth before starting the PACTOR connection and need to adjust it on the fly.  Other times, with weak PACTOR stations, I want to quickly change receive bandwidths to track the various PACTOR modes (which are changing real-time) to improve reception.  Depending on the QRM, this sometimes makes the difference between holding a connection or not.

So, having the bandwidth knobs unresponsive during transmit and not optimally responsive at other times makes doing the above very hard.

I have a KX3 on order which I also want to use for PACTOR and other ARQ modes.  Even with the one knob (KX3) vs two knob (K3) difference,  I think my comments will probably apply to both radios.

The K3 is still my favorite radio, by a large margin.
73, Bob, N7ZO.



-----Original Message-----
From: elecraft-bounces at mailman.qth.net [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Wayne Burdick
Sent: Monday, September 24, 2012 9:32 AM
To: Howard Hoyt
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] KX3 PBT

Howie,

I may be able to make the control more responsive. Meanwhile, you might experiment with the NORM function as a means of switching between two different width settings. Holding NORM will alternate between the default (400 Hz in CW mode) and a "floating" setting that you establish.

73,
Wayne
N6KR


On Sep 24, 2012, at 8:29 AM, Howard Hoyt wrote:

> I have been twisting the KX3's PBT I/II knob madly in an attempt to 
> change BW or CF rapidly, but in reality when I turn it more slowly the 
> function actually changes more rapidly.  Two possible explanations are 
> either the encoder pulse rate exceeding the I/O refresh rate, or the 
> speed with which the filter DSP can reconfigure.
>
> I would love to be able to change CF and BW more rapidly, being 
> spoiled by the instantaneous response of my old Drake R-4B's analog IF 
> parametric filter.  If the speed limitation with the KX3 is indeed a 
> refresh issue, is there a way to increase the I/O refresh rate for the 
> PBT encoder to allow for faster filter change via the knob? Of course, 
> if it is a DSP horsepower issue, it is what it is.
>
> The overall performance of the KX3's receiver is so far superior to 
> the R-4B, I don't want to use the R-4B much any more (well for that 
> reason plus tube, old capacitors, size, power requirements and other 
> issues, but that is another story).
>
> Howie - WA4PSC
>
>
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