[Elecraft] Fixing partially deaf K2.

[Kevin Cozens]

Don Wilhelm wrote:
> May I suggest that you build the test oscillator shown in the 
> Troubleshooting appendix of the K2 manual, and use that oscillator to 
> perform the Receiver Signal Tracing steps.

I would except I probably don't have the right resistor values. The Cheap 'N
Dirty signal tracing from N0SS hasn't turned up any noticeable change in
signal at any of the text points. I do have some crystal oscillator packages
which I could use with a pot on the output to do create a signal source.

The noise generator and 3-band signal generator Elecraft mini-modules are on
my Christmas wish list. I'm hoping to find one or both under the tree this
year. If not, I'll have to order them myself.

> I can't tell much about your AGC threshold, but certainly 4.1 volts is too 
> high - set it no higher than 3.8 volts.

The Rev. G manual says to set it to 3.8 during the construction phase. The
Rev. C and G manuals both say to set it to 3.6V in the signal tracing section. 
Messages on the mailing list suggest setting the AGC voltage as high as 
possible as long as you can still get no noticeable change in audio between 
AGC on and off. Since my 8V regulator is putting out 8.45V, I have decided to 
use the experimental formula for setting the AGC voltage so I have set it to 
3.98V for now.

-- 
Cheers!

Kevin.

http://www.ve3syb.ca/           |"What are we going to do today, Borg?"
Owner of Elecraft K2 #2172      |"Same thing we always do, Pinkutus:
                                 |  Try to assimilate the world!"
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