[Elecraft] K2 AGC problem- update

[Don Brown]

Hi

Sounds like you have the wrong crystal. The 16.28 MHz is used in the KPA100
for the HV and RS232 power supply. It looks just like the AGC crystal except
it is 5.068 MHz. Someone pulled the wrong part. Call or email Elecraft and
get the right crystal.

Don Brown
KD5NDB


----- Original Message -----
From: "R. Torsten Clay" <tclay@netdoor.com>
To: <elecraft@mailman.qth.net>
Sent: Sunday, January 05, 2003 12:08 PM
Subject: [Elecraft] K2 AGC problem- update


> Here's an update on my AGC problem.
>
> I checked again to see if I could hear the 2nd harmonic of the AGC xtal
> osc at 10.136. Couldn't find a signal there.  I also measured the voltage
> at U2 pin 1 (see pg 12 of Appendix E). There was very little change
> (~0.1V)  going from no signal to a very strong signal.
>
> I built a crystal oscillator (the circuit in the troubleshooting section),
> and tested it on some 10MHz and 7MHz crystals I have- it worked fine. I
> then removed X1 from the control board and put it in the oscillator. It
> oscillated, but the frequency is 16.2906 MHz instead of 5.068MHz!
>
> Any idea what is going on? Do I have the wrong crystal at X1? Mine is a
> low-profile type, labeled "S162ECSL" on the top of the can.
>
> Torsten
> N4OGW
>
> > Subject: [Elecraft] K2 AGC problem
> >
> >
> > > Hi all,
> > >
> > > I'm having a problem with my K2's (#3134) AGC. I've got everything
built
> > > up through the 40m rx tests.
> > >
> > > The problem is that the AGC is very weak. A signal that registers
S9+40 on
> > > my Omni VI only gets to about S3 on the K2, and is painful to listen
to
> > > without turning down the gain manually. I have set the AGC voltage to
spec
> > > and calibrated the S-meter, but somehow don't get enough AGC action.
> > >
> > > Any suggestions on how to troubleshoot?
> > >
> > > Torsten
> > > N4OGW
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> >
> >
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