[Elecraft] swr

[syd smith]

I have had K2/100 #3324 on the air for about 6 months when the swr went out 
of sight and of course it would trip out of transmit.  After running around 
in tight circles looking into the antenna, I hooked the K2 up to the dummy 
load and read an swr of greater than 2.  So I went back to the SWR Bridge 
Null adjustment procedure with the following resuts:
1.  C1 has little if any effect.  Measuring voltage at U5 pin 1 its about 17 
mv and varies about a mv with C1 tweaks.
2. I can achieve 1:1 if I tweak R27 to about the end of its range rather 
than the mid range where it belongs.
3.  But at any power  greater than 1 watt the K2 trips out of TUNE after 
about 3 seconds, displays ELECRAFT for a second, and then the normal freq. 
display.
4.  The swr varies with power i.e. if adjusted for 1:1 at less than a watt, 
it rises to 2:0 at 5 watts.

  I tore it apart and reheated all connections associated with the bridge.

Any comments would be greatly appreciated.

Syd WB4W

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