[Elecraft] K3 - NOT K3S - issue: TX Calibration fails on 6m only

[Bob McGraw K4TAX]

I perform "radio maintenance" about every 2nd month or so.

That includes check frequency {adjust REF CAL as necessary}, check power 
output on all bands {run TX Gain Cal as necessary}, receiver sensitivity 
{run RX Gain cal as necessary} and then perform a full back up of the 
configuration data.    At the same time, I'm amazed at how stable and 
accurate the radio maintains in all regards.

I've not experienced any failures of the TX gain calibration except when 
the KPA3A had issues.  That was replaced with a Rev E unit and no 
problems observed since then.

73

Bob, K4TAX

On 4/2/2020 9:01 AM, hawley, charles j jr wrote:
> I had the same issue with a brand new K3S. It failed a couple times and then it passed once...so I left it there. I have not been on 6M but I assume it will work fine. I do feel apprehensive though about running the cal again.
>
> Chuck Hawley
>   c-hawley at illinois.edu
>
>   Amateur Radio, KE9UW
>   aka Jack, BMW Motorcycles
>
> ________________________________
> From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> on behalf of Jim Spears <n1nk at cox.net>
> Sent: Thursday, April 2, 2020 8:12 AM
> To: elecraft at mailman.qth.net <elecraft at mailman.qth.net>
> Subject: [Elecraft] K3 - NOT K3S - issue: TX Calibration fails on 6m only
>
> I am helping a friend upgrade an older K3/100 (s/n 798) after he recently
> acquired it from estate of a SK.  I have brought firmware forward one or two
> versions and installed the KIO3B board set.  The radio has main RX only and
> the KSYN3A upgrade.  It does have the KANT3 antenna tuner.
>
>
>
> I ran the 5 watt TX Calibration and it failed due to high swr on 6m only.  I
> thought this curious so ran this test against one of my K3S with the same
> high quality dummy load and cable.  It passed.  I also scanned the dummy
> load with my RigExpert and it is flat to at least 2m.
>
>
>
> We would appreciate any suggestions as to how to further troubleshoot this
> issue.  My friend says that 6m is not important to him - today - but
> tomorrow might be a different story.  It seems reasonable to us that so long
> as we are working on it, we should leave it fully operational.
>
>
>
> I have not looked to see if the front panel to main board pin upgrade or any
> other hardware mod has been performed.
>
>
>
> Jim
>
> N1NK
>
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