[Elecraft] KAT500 auto trainer

[kd4iz at frawg.org]

Bob,

My experience has been the same as yours. Extremely easy to do manually and stable.

Jack - kd4iz

-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Bob McGraw K4TAX
Sent: Saturday, December 14, 2019 19:40
To: Andy Durbin <a.durbin at msn.com>
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] KAT500 auto trainer

I didn’t find it a challenge at all. I started on 160M and finished on 6M all in about an hour.  Those values are still good some 1 year later. 

It is really nice to operate 160M - 6M at 500W (except 60M & 30M) and only change the frequency on my K3S.  Nothing tedious about that. 

Bob, K4TAX


Sent from my iPhone

> On Dec 14, 2019, at 5:40 PM, Andy Durbin <a.durbin at msn.com> wrote:
> 
> Back on Dec 7th I posted "Popular wisdom is that KAT500 should be trained for all frequencies in a band and then operated in manual mode.  This is what I do at my station but I find the training process to be a bit tedious and  I'm considering automating the training process."
> 
> I now have a test version working.  It currently has 2 functions:
> 
> 
>  1.   Sweep and Autotune - Set TX frequency and KAT frequency to center of first bin of current band.  When frequencies are verified then initiate autotune and TX with autotune power.  When tune complete advance to next bin center frequency and repeat.
>  2.  Sweep and check SWR -  Set TX frequency and KAT frequency to center of first bin of current band.  When frequencies are verified then TX with 5 W  for 2 seconds to allow a check of LP-100A indicated SWR or complex load.  Then advance to next bin center frequency and repeat.
> 
> The tuning solution for first autotune pass seems to be rather poor 
> for some bins but it improves with a second or third pass.  (I 
> understand the result depends on the power setting but there seems to 
> be more to it than that. Auto fine tune is enabled. )
> 
> My last autotune sweep of the entire 160 m band took 1 minute 10 seconds.  The check sweep took 1 minute 20 seconds.  Check sweep time should be constant but the time for the autotune sweep will be quite variable.
> 
> A future refinement of the check sweep may be to set an SWR threshold and log all frequencies that don't indicate better than that value.  These would then be presented in sequence for manual adjustment.
> 
> So, still a work in progress, but appears to have potential.  And yes, there will be an option to CW ident after tuning each bin although my preference is to minimize time on frequency.
> 
> Andy, k3wyc
> 
> 
> 
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