[Elecraft] KPA1500 Low Gain Fault and then distorted output

[john at kk9a.com]

I have no knowledge regarding repairing your KPA1500.  

The KPA1500 is very inefficient at the power levels that you are using which
may be causing your RF deck failures. Perhaps the KPA500 would be better
suited?

John KK9A



wa3afs wrote:

Does not look very promising.....

First, I experienced 2 back to back OVR 61 - LOW GAIN freq 10120 inp 7W fwd
40W refl 2W swr 1.5 9A 23C adc169 power 
ratio 6

and then a single FLT 61 - - LOW GAIN freq 10120 inp 7W fwd 40W refl 2W swr
1.5 9A 23C adc169 power ratio 6

After that no error indications BUT I first observed that it took double the
input power to get to my expected normal output power

and 

Then audio reports that said I had RF on my signal (when the KPA 1500 was
being used).  Running barefoot audio was normal.

Any ideas?  I generally run the KPA1500 in the range of 200 watts (30M) to
700 watts (normally around 500 watts)

Disappointed....This is the 3rd failure ( 2nd for RF deck) of my KPA1500 in
less than 2 years.


73
-- Bruce, WA3AFS