K3 transmitter gain calibration fails due high SWR

[peterc281]

I decided to run through the calibration of my K3 after it came back from the VK9NT Dxpo. I find I can’t complete the transmit gain calibration as the SWR is to high on some bands.
1.8 to 10.1 are fine, the rest are as follows 14.1 is 1.5:1, 18.1 1.8:1, 21.1 2.7:1, 24.9 2.2:1, 28.4 2.4:1, 50.1 1.3:1.
I’m after suggestions what to look for as I am not sure what could cause this problem.

73 Peter VK3IJ

[Dick Dievendorff]

Tx gain cal should succeed as long as the SWR does not exceed 2.0:1. Can you turn on trace on the view menu and send me a trace of the failing calibration.

Dick, K6KR


On May 23, 2013, at 16:36, peterc281 <[hidden email]> wrote:

> I decided to run through the calibration of my K3 after it came back from the
> VK9NT Dxpo. I find I can’t complete the transmit gain calibration as the SWR
> is to high on some bands.
> 1.8 to 10.1 are fine, the rest are as follows 14.1 is 1.5:1, 18.1 1.8:1,
> 21.1 2.7:1, 24.9 2.2:1, 28.4 2.4:1, 50.1 1.3:1.
> I’m after suggestions what to look for as I am not sure what could cause
> this problem.
>
> 73 Peter VK3IJ
>
>
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/K3-transmitter-gain-calibration-fails-due-high-SWR-tp7574132.html
> Sent from the Elecraft mailing list archive at Nabble.com.
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[Eric Swartz - WA6HHQ]

TX Gain CAL should be run when transmitting into a 50 ohm dummy load.
Also make sure your KAT3 ATU is bypassed.

73,

Eric
elecraft.com

On 5/23/2013 4:36 PM, peterc281 wrote:

> I decided to run through the calibration of my K3 after it came back from the
> VK9NT Dxpo. I find I can’t complete the transmit gain calibration as the SWR
> is to high on some bands.
> 1.8 to 10.1 are fine, the rest are as follows 14.1 is 1.5:1, 18.1 1.8:1,
> 21.1 2.7:1, 24.9 2.2:1, 28.4 2.4:1, 50.1 1.3:1.
> I’m after suggestions what to look for as I am not sure what could cause
> this problem.
>
> 73 Peter VK3IJ
>
>
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/K3-transmitter-gain-calibration-fails-due-high-SWR-tp7574132.html
> Sent from the Elecraft mailing list archive at Nabble.com.
> ______________________________________________________________
> 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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[Joe Subich, W4TV-4]

 > Also make sure your KAT3 ATU is bypassed.

Reset your ATU into a 50 Ohm load before selecting bypass.

73,

    ... Joe, W4TV


On 5/23/2013 8:17 PM, Eric Swartz - WA6HHQ, Elecraft wrote:

> TX Gain CAL should be run when transmitting into a 50 ohm dummy load.
> Also make sure your KAT3 ATU is bypassed.
>
> 73,
>
> Eric
> elecraft.com
>
> On 5/23/2013 4:36 PM, peterc281 wrote:
>> I decided to run through the calibration of my K3 after it came back
>> from the
>> VK9NT Dxpo. I find I can’t complete the transmit gain calibration as
>> the SWR
>> is to high on some bands.
>> 1.8 to 10.1 are fine, the rest are as follows 14.1 is 1.5:1, 18.1 1.8:1,
>> 21.1 2.7:1, 24.9 2.2:1, 28.4 2.4:1, 50.1 1.3:1.
>> I’m after suggestions what to look for as I am not sure what could cause
>> this problem.
>>
>> 73 Peter VK3IJ
>>
>>
>>
>> --
>> View this message in context:
>> http://elecraft.365791.n2.nabble.com/K3-transmitter-gain-calibration-fails-due-high-SWR-tp7574132.html
>>
>> Sent from the Elecraft mailing list archive at Nabble.com.
>> ______________________________________________________________
>> 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
>
> ______________________________________________________________
> 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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[peterc281]

Murphy strikes again!

I changed the cable and used a 50 ohm load and all good, looks like the cable was duff!!

Cheers Peter 3IJ