[Elecraft] XV144 L16 Adjustment

[Joe Barger]

Hi All,

I'm having trouble getting 20W out of an XV144.  I get around 7W out with 5W 
drive (with the jumpers set for 5W drive), and more drive doesn't produce 
more output.  The drive attenuation resistors show a little "burned" color, 
but a check with an ohm meter says they are OK.  The voltages in the 
troubleshooting chart look fine.  Receiving seems to be OK as well.  It's 
part of a club station, so it's possible it's been overdriven at one point 
or another.  I replaced the MAR-3 (in case it was damaged), but no 
difference.  While adjusting the 28MHz IF strip I noticed that L16 peaks 
when the slug is removed from the top of the can.  The instructions say this 
is normal for L17, but is it also normal for L16?  The voltage at TP5 was 
still going up quickly when the slug came out, so it seems the inductance 
needs to be even lower to reach resonance.

When I first build the unit it tuned right up and worked fine. 
Unfortunately I didn't make any notes on where L16 was then.

Any sage advice before I drag a 'scope out of a lab to the shack to continue 
troubleshooting?

Thanks

joe n6kk