[Elecraft] [MM] XG1 signal problem

[Jim HaRRIS]

Brian,

I had a similar problem off and on with my XG1 for 2-3 years.  While
recently calibrating the S meter in my new K3 it came to the point I could
no longer use it.  During troubleshooting as you did I found that tapping
the case of X1 (crystal case) would cause the problem to come and go.  I
installed a replacement crystal from Elecraft and no longer had the problem. 
I also replaced the variable cap at the same time as a tiny piece of
insulation was sticking out from the edge of the top metal plate under the
adjustment screw.

If troubleshooting doesn't find another problem you might replace the
crystal and/or variable cap to see what happens.

Have a good day and 73,

Jim, W0EM



Brian - N5BCN wrote:
> 
> Hello all,
> 
> When attempting to calibrate my K2's S-meter with a XG1, I discovered the
> XG1 itself is having a problem.  I verified this by connecting it to a
> working IC-7600.
> 
> The signal output on it, although heard, is very weak.  Adjusted for
> on-frequency, the s-meter reads about S2 or S3.  Touching the XG1 can get
> the signal up to about S4 or S5.  Switching between 1 uV and 50 uV makes
> no apparent difference in signal strength on the s-meter.
> 
> Resistance checks on the XG1 and found some problems:
> 
> Resistance from the following junctions to ground:
> 
> U2, R1 = 50 k Ohms (should be 57-63 k Ohms)
> C4, R3 = 50 k Ohms (should be 57-63 k Ohms)
> R1, C1 = 54 k Ohms (should be 67-73 k Ohms)
> 
> Checked all component placements and solder joints, no obvious problems. 
> Reheated all solder joints (twice now) just in case; no improvement.
> 
> My next step is to measure all the resistor and capacitor values.
> 
> Do these symptoms jump out anybody as something obvious (bad xtal or other
> component)?  Any suggestions will be most appreciated.
> 
> 73
> 
> Brian - N5BCN 
> 

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