From: Robert Allbright <[EMAIL PROTECTED]>
Date: 23 March 2006 11:33:05 GMT
To: [email protected]
Subject: K2 AGC off problem
Hello Werner
I replaced X1 and all is now well with K2 5219, just need to build
the KPA100w amp sometime.
see the note below from Ken K3IU (thanks again Ken)
73
Robert G3RCE
---------------------------
Message: 8
Date: Thu, 23 Mar 2006 09:15:47 +0100
From: "Dr. Werner Furlan" <[EMAIL PROTECTED]>
Subject: [Elecraft] K2 AGC off problem
To: [email protected]
Message-ID: <[EMAIL PROTECTED]>
Content-Type: text/plain; charset=US-ASCII
hi all,
I should have posted this before...
I found a related message when searching the archive. The reply was:
------------------
Sounds exactly like the problem I had with 5196. The problem was
fixed by
replacing X1 on the Control Board. You will probably find that
CtrlBd-U2-1
goes to about 6 volts when you turn the AGC OFF virtually shitting
down the
IF amplifier. I encourage you to communicate with Gary
([EMAIL PROTECTED]) regarding this problem. Yesterday, someone
reported a
similar problem with a close serial number(s/n5219).
----------------------
My serial # is 5203, so maybe I am also affected by this failure?
73! de Werner OE9FWV
--
EYEDROPPER: A clumsy ophthalmologist
Hello Robert:
I recently had a problem with the AGC on a K2(5196) that I was
assembling.
In my case, what was happening was when I turned the AGC OFF (PRE/
ATT + AGC)
the AGC voltage back to the IF amp was going very high and basically
shutting down the IF amp. This also resulted in the S-meter
indication going
high. You can easily check this by measuring the DC voltage on U2
(on Control
Board) pin 1. If this voltage shoots up (In my case it went to
about 6
volts) when you turn the AGC OFF, then that is what is happening.
After
consulting with Gary Surrency ([EMAIL PROTECTED]), I replaced
a bunch of
components, but of course it was the last component that was
changed that
solved the problem... X1 was bad. If this is what you find, then
I suggest
that you email Gary, let him know what you find. Of course,
always be sure
that all components of the right values are in the right place
and RE-check
the soldering.
Of course, this may not be your problem at all, but it sounded so
similar to
mine, I thought I'd pass along my experience.
Good luck & 73,
Ken Wagner K3IU
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