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(K3) Low power on some bands

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Jan Ditzian

(K3) Low power on some bands

A strange thing just occurred. I have been using my K3 regularly with
no problem, usually into an amplifier. Recently, I had an amplifier tube
short and I am using the K3 barefoot. I was tuning up on 80 and saw
that my Autek WM-1 said that I was only putting out 70 watts into my old
1500 watt dry dummy load (SWR<1.35:1). I checked the power setting and
it was adjusted to 100 on the K3 display. I ran through the other
bands, and now I am fully confused. Here is what I found, with the K3
display reading 100 watts at all times:

10 meters 95 watts
12 90
15 50
17 95
20 95
30 95
40 70
80 70
160 100

Does anyone have an explanation or cure? Could it just be the old Autek?

73,

Jan, KX2A

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Vic Rosenthal

Re: (K3) Low power on some bands

Run the TX Gain calibration procedure in the K3 utility. And try another
wattmeter!

73,
Vic, 4X6GP/K2VCO
Rehovot, Israel
http://www.qsl.net/k2vco/

On 5 Jun 2015 08:16, Jan wrote:

> A strange thing just occurred. I have been using my K3 regularly with
> no problem, usually into an amplifier. Recently, I had an amplifier tube
> short and I am using the K3 barefoot. I was tuning up on 80 and saw
> that my Autek WM-1 said that I was only putting out 70 watts into my old
> 1500 watt dry dummy load (SWR<1.35:1). I checked the power setting and
> it was adjusted to 100 on the K3 display. I ran through the other
> bands, and now I am fully confused. Here is what I found, with the K3
> display reading 100 watts at all times:
>
> 10 meters 95 watts
> 12 90
> 15 50
> 17 95
> 20 95
> 30 95
> 40 70
> 80 70
> 160 100
>
> Does anyone have an explanation or cure? Could it just be the old Autek?
>
> 73,
>
> Jan, KX2A

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Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Don Wilhelm-4

Re: (K3) Low power on some bands

In reply to this post by Jan Ditzian

Jan,

Run the TX Gain Calibration. You may have to borrow a dummy load that
has a lower SWR if the calibration procedure shows errors.
K3 Utility makes it easy and automatic, but it can be done manually -
see the Calibration section of the manual.

73,
Don W3FPR

On 6/5/2015 1:16 AM, Jan wrote:

> A strange thing just occurred. I have been using my K3 regularly with
> no problem, usually into an amplifier. Recently, I had an amplifier
> tube short and I am using the K3 barefoot. I was tuning up on 80 and
> saw that my Autek WM-1 said that I was only putting out 70 watts into
> my old 1500 watt dry dummy load (SWR<1.35:1). I checked the power
> setting and it was adjusted to 100 on the K3 display. I ran through
> the other bands, and now I am fully confused. Here is what I found,
> with the K3 display reading 100 watts at all times:
>
> 10 meters 95 watts
> 12 90
> 15 50
> 17 95
> 20 95
> 30 95
> 40 70
> 80 70
> 160 100
>
> Does anyone have an explanation or cure? Could it just be the old Autek?
>
> 73,
>
> Jan, KX2A
>
> ______________________________________________________________
> 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
> Message delivered to [hidden email]
>