[Elecraft] Fw: k2

[Don Wilhelm]

Scott,

The KPA100 wattmeter is not communicating the power level back to the K2 
microprocessor and that means the drive is increased to maximum - yes, 
that will create splatter on SSB.

The most likely problem is that diodes D16 and D17 in the KPA100 
wattmeter have been damaged.
Get yourself 2 new 1N5711 diodes and replace those diodes and it is 
likely that you will be back in business.  You can use 1N4148 (or 1N914) 
diodes if you do not care so much about the accuracy at low power levels.

As a preventive measure, remove the antenna from the K2 when not in 
use.  An antenna switch makes that an easy task.  Those diodes are 
easily damaged by static discharges caused by wind, rain, snow or 
lightning on your antenna.  You might want to consider creating a DC 
discharge path from the antenna as well - a 100 uHy choke across the 
feedline will create that DC path and not interfere with RF, even at 160 
meters.


Scott McBain wrote:
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> I have a K2 with SSB, 100W PA deck, and 100W antenna tuner.  I sent this in a while ago, and ya'll got it working great.   During the Rookie Roundup, it developed a major problem.  I was on SSB and splattering all over the place.  I disable the pa deck, and set the power to 1W and I'm transmitting between 20 and 30 watts, depending on the band.  All bands are 20 except for 40m which is 30 watts.  I've made a few measuments of resistance and voltage, but so far everything seems fine.  It receives fine, and works correctly in every other way.  I also tried it in tune mode, and with a CW key, and I get the same results.  I did purchase some coax a while back, that gave me fits for quite some time, I finally figured out, the center pin was shorted out to the shield.  I replaced the ends, and everything was working great.  I haven't used it much between then and now, so it may be a contributing factor. Will you recommend what I can do to narrow
>  down the problem?
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>
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