Bill,
That kind of damage is not typical of shipping damage. I would rather
suspect that it received a static surge (wind, rain, snow static or
nearby lightning) before you got it in your hands.
Put a DC path across your antenna feedline - 27k to 100k resistor or an
RF choke (100 uHy is good) to prevent future occurrences, but put it at
your antenna switch or some other place, but not inside the KPA100. If
you have no other choice, put the resistor or choke inside a PL-259 body
and use a UHF Tee adapter - the resistor goes on one side of the Tee,
the antenna goes to the other side..
73,
Don W3FPR
On 3/24/2013 7:08 PM, Bill and Gail Stewart wrote:
I am trying to repair a K2/100 that I believe was damaged in shipment
to me. The power output was erratic - sometimes almost no power out,
sometimes about half power. I investigated the SWR circuitry in the
KPA100 and replaced R29, which was discolored but still had the
correct resistance. After carefully reassembling the unit, the power
output is now greater than maximum rated power regardless of the power
setting (just keyed momentarily and measured with a peak-reading
wattmeter). The resistance from either side of R28 to ground is about
92 ohms, the same for the cathodes of D16 and D17. Is this correct? Is
U5 blown?
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
