[Elecraft] K3: KPA100 Squeal

[Adi Andrei]

I have the same thing happening, similar series K3 (5k something) , also assembled in March.

Adi
2E0TTX


On 27/06/2011 13:38, Joe Harris wrote:
> I have very similar symptoms in my K3/100 (SN 5284) that I assembled in
> March. It makes the sound even if I am in TX test mode. Again, no
> performance issues, just a slightly bothersome squeal / whine.
>
>
>
> On Sun, Jun 26, 2011 at 8:23 PM, Geoffrey Wolf<liltechdude13 at gmail.com>wrote:
>
>> First off it was a great Field Day and my new K3 impressed me extremely not
>> only in performance but in it's functionality.
>>
>> To kick off Field Day I installed a new KPA100 into the K3. I did all the
>> necessary TX gain calibrations using a dummy load.
>>
>> One thing I noticed immediately was that I was hearing a very high pitched
>> squeal coming from either the PA board or possibly the KIO3 (the board the
>> amp plugs into). The squeal seems to vary in frequency each time the
>> transmitter keys up (can only hear it when the radio is in TX). The squeal
>> is not very loud but its loud enough for me to hear it if I listen closely.
>> It doesn't seem to be power related. The squeal is there even if the radio
>> is in TX but no power going out (RF Pwr set to 0W). The closest thing I can
>> compare the sound to is perhaps a tiny leak in an air hose. Is this typical
>> of a bad solder joint or something?
>>
>> This squeal only pertains to the new KPA100 installation. Before the amp
>> was installed I didn't hear a thing.
>>
>> I should also note that nothing appears to be affecting performance. Puts
>> out 100 watts no problem. Clean modulation, etc.
>>
>> --------------
>> Geoffrey Wolf
>> AB3LS (Amateur Radio Callsign)
>> University of Pittsburgh '14
>> grw20 at pitt.edu
>> Liltechdude at me.com
>>
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>
>