[Elecraft] K3S Chirp?

[Jim Sheldon]

I've actually heard a K3 (not a K3S) with a very slight chirp when using an Ameritron AL-811 amp and even a little more chirp when using an Alpha (not sure the model) caused by RF feedback somewhere in the system.  Before he got rid of his KPA500 this never happened.  Funny, but he's only running around 500 watts out with the Ameritron.  I suspect it is caused by an almost resonant piece of coax between the K3 and the amp as it only seems to happen on 40 meters.

W0EB

Sent from my iPad

> On Dec 29, 2016, at 3:53 PM, Buck <radiok4ia at gmail.com> wrote:
> 
> I thought chirp was a voltage issue.  Any chance your power cable is inadequate, too long or the PowerPoles are not right?  Check the voltage on the K3 display when you key down.
> 
> Buck, k4ia
> Honor Roll
> 8BDXCC
> 
>> On 12/29/2016 3:27 PM, Doug Smith wrote:
>> I was in the CW SS in November using my then new K3S with an ACOM 1500.  All of which was *great*.
>> 
>> But, then, I received an Official Observer Advisory Notice that I was “emitting a CW signal with a chirp”.  The report detailed a QSO that is, indeed, in my SS log.  I was running on 20 meters at the time.
>> 
>> FYI, the ACOM is on it’s own 240 VAC circuit and the K3S is on it’s own 120 VAC circuit.  The rest of the shack is on a separate 120 VAC circuit.
>> 
>> Since receiving the report I’ve listened to my signal on two different receivers and I do not hear a chirp.  Is there any possible way I could have somehow misadjusted the K3S during the contest that would result in a chirp?
>> 
>> 73,
>> Doug, W7KF
>> http://www.w7kf.com <http://www.w7kf.com/>
>> 
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