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K2/100 7211 TX Power output meter stopped working

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Mike Sanders

K2/100 7211 TX Power output meter stopped working

Good Morning, Yeah, not sure what happened but appears when in
high power mode over 10 watts power control does not work either.
It gives full output. I just replaced diodes D1 and D2 1N5711s but
the problem continues the same. Before I get any deeper into this does
anyone have any experience with this failure and any ideas? I sure
thought the diodes would fix this. I triple checked my work and the
orientation of the diodes on the board. 73, Mike K0AZ

K0AZ
Mike Sanders
EM37cd SW Missouri
www.k0az.com

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Mike Sanders

Re: K2/100 7211 TX Power output meter stopped working

Sorry that should have been D16 and 17. I'm going to look at the
circuit again and again. 73

K0AZ
Mike Sanders
EM37cd SW Missouri
www.k0az.com

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Mike Sanders
Sent: Friday, January 03, 2014 7:13 AM
To: [hidden email]
Subject: [Elecraft] K2/100 7211 TX Power output meter stopped working

Good Morning, Yeah, not sure what happened but appears when in
high power mode over 10 watts power control does not work either.
It gives full output. I just replaced diodes D1 and D2 1N5711s but
the problem continues the same. Before I get any deeper into this does
anyone have any experience with this failure and any ideas? I sure
thought the diodes would fix this. I triple checked my work and the
orientation of the diodes on the board. 73, Mike K0AZ

K0AZ
Mike Sanders
EM37cd SW Missouri
www.k0az.com

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Bill Coleman-2

Re: K2/100 7211 TX Power output meter stopped working

I had a failure of the EL5146C op amp. You might check it. In my case, mine shorted internally, which brought the +5 volt supply to zero, which made the K2 think the KPA100 was not installed. But, yours might have opened or something.

I think D16 & D17, as well as the EL5146C might be pretty good targets for static discharges from the antenna.

On Jan 3, 2014, at 8:21 AM, Mike Sanders <[hidden email]> wrote:

> Sorry that should have been D16 and 17. I'm going to look at the
> circuit again and again. 73
>
> K0AZ
> Mike Sanders
> EM37cd SW Missouri
> www.k0az.com
>
>
>
>
>
>
> -----Original Message-----
> From: [hidden email]
> [mailto:[hidden email]] On Behalf Of Mike Sanders
> Sent: Friday, January 03, 2014 7:13 AM
> To: [hidden email]
> Subject: [Elecraft] K2/100 7211 TX Power output meter stopped working
>
> Good Morning, Yeah, not sure what happened but appears when in
> high power mode over 10 watts power control does not work either.
> It gives full output. I just replaced diodes D1 and D2 1N5711s but
> the problem continues the same. Before I get any deeper into this does
> anyone have any experience with this failure and any ideas? I sure
> thought the diodes would fix this. I triple checked my work and the
> orientation of the diodes on the board. 73, Mike K0AZ
>
> K0AZ
> Mike Sanders
> EM37cd SW Missouri
> www.k0az.com
>
>
>
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> 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
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> Post: mailto:[hidden email]
>
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Bill Coleman, AA4LR, PP-ASEL Mail: [hidden email]
Web: http://boringhamradiopart.blogspot.com
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901

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Don Wilhelm-4

Re: K2/100 7211 TX Power output meter stopped working

In reply to this post by Mike Sanders

Mike,

Check the power control 5 watts requested. If you actually get more
than 10 watts output then either the diodes (I understand you replaced
them) or KPA100 U6 may be the cause - there are a few other
possibilities too.

During a TUNE, you should have voltage into U6 pin 3, and approximately
twice that voltage at U6 pin 7.
If no output at U6 pin 7, check U6 pin 8. If it is not 5 volts, then
you have a firmware problem.

73,
Don W3FPR

On 1/3/2014 8:21 AM, Mike Sanders wrote:

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