Re: K3/100 - High power problem solved

[Robert Mccormack]

Hi Ron,

Bingo!   This K3/100 has gold-plated pins - no corrosion but I sprayed them with a little 'De-Oxit', re-seated the 100w module and now all is well..

I'll send the cigar by courier.

73 and thanks again,

Ken ZL1AIH



--- On Sun, 11/12/11, Ron D'Eau Claire <[hidden email]> wrote:

From: Ron D'Eau Claire <[hidden email]>
Subject: RE: [Elecraft] K3/100 - High power problem
To: "'Robert Mccormack'" <[hidden email]>, [hidden email]
Date: Sunday, 11, December, 2011, 5:06 PM

This is a bit more invasive, but a few earlier KPA100 modules had a problem
with the interface connector to the main RF board that carriers the +13V to
the KPA500 itself. The pin corroded and heated and, in a few cases, burned.
I believe the current KPA500's have gold plated connectors. Of course, that
removed all power from the 100 watt amp.

I'd remove the KPA500 module and inspect the connector. You can reach the
screws from the top (careful - don't drop the screws or lock washers - they
can be a chore to retrieve if you don't have a small magnet). Pull the
module off and look closely at the multipin connector to see if there's any
sign of overheating or discoloration.

Ron AC7AC

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Robert Mccormack
Sent: Saturday, December 10, 2011 4:07 PM
To: [hidden email]
Subject: Re: [Elecraft] K3/100 - High power problem

Hi All,

Many thanks - yes PA NOR was and remains enabled but 12 watts is still
maximum power available.
This K3/100 was delivering 100 watts before I commenced the CAL procedure -
the only reason I took the top cover off was to find the FL1 offset, so
nothing has been disturbed.

I've run out of ideas.<G>

73, Ken ZL1AIH




--- On Sun, 11/12/11, Ron D'Eau Claire <[hidden email]> wrote:

From: Ron D'Eau Claire <[hidden email]>
Subject: RE: [Elecraft] K3/100 - High power problem
To: "'Robert Mccormack'" <[hidden email]>, [hidden email]
Date: Sunday, 11, December, 2011, 11:44 AM

Make sure the KPA100 option is installed and enabled. That sounds like it is
not (the basic K3 has a 10 watt transmitter). Suggest you look in the
Owner's manual and perform the procedures to enable and then test and
calibrate the KPA100. Likely that will point to the problem.

Good luck!

Ron AC7AC

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Robert Mccormack
Sent: Saturday, December 10, 2011 2:09 PM
To: [hidden email]
Subject: Re: [Elecraft] K3/100 - High power problem

While checking a K3/100 #4114 on behalf of SK estate, I find that the power
cannot be set higher than 12 watts.
Operation was normal until I commenced a CAL procedure to correct a 2kHz
difference between 'indicated' and transmitted frequency.

Checked all the menu functions but can't find any reference to power
limitation - searched the archives but no luck.

Any help is appreciated.

73, Ken ZL1AIH.


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