TX Gain Calibration Fails on 6 meters

[Elecraft mailing list]

I purchased Elecraft K3S S/N 11672 in August 2018.  The build was completed in November 2018.  At that time all the tests and calibrations were completed successfully.

Now the TX Gain Calibration fails on Low Power and High Power on 50 MHz. only.  

Page 67 of Elecraft K3S owners manual TXGN Description states LP 0-12W and
HP 13-120W.

On 160-10 meters I hear the relay switch from LP to HP amplifier when the power adjustment is increased from 12 to 13W as described.

On 6 meters the relay switches from LP to HP amplifier when the power is adjusted from 8 to 9W.

The error message states “TX Calibration failed because Transmit Power did not reach the expected value.”

The TX calibration is performed per the instructions into a proper 50 ohm dummy load.

I submitted this to Elecraft Support last week but have not received a response, so I thought I would ask the group for ideas.

Thanks in advance.

Frank
K6FW
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[ke9uw]

I had the 50 MHz gain cal fail with the initial build of my K3s. Don't remember which power. I repeated the cal several times and one time it passed. I left it there. Not anxious to try it again.

Chuck Hawley
 [hidden email]

 Amateur Radio, KE9UW
 aka Jack, BMW Motorcycles

________________________________
From: [hidden email] <[hidden email]> on behalf of Frank via Elecraft <[hidden email]>
Sent: Wednesday, March 13, 2019 12:04 AM
To: [hidden email]
Subject: [Elecraft] TX Gain Calibration Fails on 6 meters

I purchased Elecraft K3S S/N 11672 in August 2018.  The build was completed in November 2018.  At that time all the tests and calibrations were completed successfully.

Now the TX Gain Calibration fails on Low Power and High Power on 50 MHz. only.

Page 67 of Elecraft K3S owners manual TXGN Description states LP 0-12W and
HP 13-120W.

On 160-10 meters I hear the relay switch from LP to HP amplifier when the power adjustment is increased from 12 to 13W as described.

On 6 meters the relay switches from LP to HP amplifier when the power is adjusted from 8 to 9W.

The error message states “TX Calibration failed because Transmit Power did not reach the expected value.”

The TX calibration is performed per the instructions into a proper 50 ohm dummy load.

I submitted this to Elecraft Support last week but have not received a response, so I thought I would ask the group for ideas.

Thanks in advance.

Frank
K6FW
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[Bob McGraw - K4TAX]

My K3S s/n 10163 I find my results are the same as yours as below.

"On 6 meters the relay switches from LP to HP amplifier when the power is adjusted from 8 to 9W."

"On 160-10 meters I hear the relay switch from LP to HP amplifier when the power adjustment is increased from 12 to 13W as described."


Also noted with TUNE power set to 20 watts, all bands 160M - 10M operate
normally at 20 watts displayed and measured. However on 6M when TUNE is
activated the displayed power is 16 watts and the measured power is 16
watts. When PWR is set to 20 watts, the measured output is 16 watts.
However, If I set the PWR to 100 watts the measured power is 100 watts.
On 6M if I set TUNE Pwr to 25 watts, when Tune is activated it displays
21 watts and output is 21 watts. Clearly there seems to be an issue in
firmware for 6M only. I recall sending the concern to Elecraft. At the
same time, I don't consider it to be a major issue. 73 Bob, K4TAX


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[Elecraft mailing list]

How are you doing the calibration - manual or computer? If computer, PC or Mac? Make sure you have the latest K3 Utility to do this. Recent versions of the K3 Utility had an issue with handling responses from the K3/K3S that caused calibration to fail. I believe they were fixed on the Windows version, but I don’t think that has been taken care of on the Mac yet.
I will have to check to make sure.

Repeating the process is worth while. My own experience is that it will eventually complete.

73!
Jack, W6FB

> On Mar 12, 2019, at 10:04 PM, Frank via Elecraft <[hidden email]> wrote:
>
> I purchased Elecraft K3S S/N 11672 in August 2018.  The build was completed in November 2018.  At that time all the tests and calibrations were completed successfully.
>
> Now the TX Gain Calibration fails on Low Power and High Power on 50 MHz. only.  
>
> Page 67 of Elecraft K3S owners manual TXGN Description states LP 0-12W and
> HP 13-120W.
>
> On 160-10 meters I hear the relay switch from LP to HP amplifier when the power adjustment is increased from 12 to 13W as described.
>
> On 6 meters the relay switches from LP to HP amplifier when the power is adjusted from 8 to 9W.
>
> The error message states “TX Calibration failed because Transmit Power did not reach the expected value.”
>
> The TX calibration is performed per the instructions into a proper 50 ohm dummy load.
>
> I submitted this to Elecraft Support last week but have not received a response, so I thought I would ask the group for ideas.
>
> Thanks in advance.
>
> Frank
> K6FW
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

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[David J. Schmocker]

Hello, K3S. S/N 11532 K3 Utility running on Mac OS 10.14.6 Mojave

I found that running Transmitter Gain utility requires these settings within
K3S Config menu to enable test to pass (with good 50 Ohm load on both ANT1
and XVTR-Out ports):

Transmitter Gain tests:
5W test.  requires Config - XVTR -  OFF
50W test requires Config - XVTR -  OFF
mW test requires Config - XVTR - ON.  

I suppose this makes sense (turn the transporter on for the mW test which is
used to drive the Transverter).

73,
Dave KJ9I




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