Re: KX3 PBT - and K3?

[Robert Wright]

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: [hidden email] [mailto:[hidden email]] On Behalf Of Wayne Burdick
Sent: Monday, September 24, 2012 9:32 AM
To: Howard Hoyt
Cc: [hidden email]
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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[ab2tc]

Hi,

I have not noticed any lack of responsiveness of the PBT knobs during receive on my K3 (FW 4.14). I can not turn them fast enough to have them skip any steps. Lots of knobs and buttons are ignored during TX, including the PBT knobs. To me it's no big deal but I can see the other point of view.

AB2TC - Knut

Robert Wright wrote

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.

<snip>