[Elecraft] K3 FSK power transients

[Jan Erik Holm]

I just noticed some issues like that last weekend when
operating the SAC CW contest. All off a sudden when tuning
up on 10m a big bang occured in my linear amplifier. Now
nothing got hurt it just blew the fuses. This amp used
to be driven with 200W and I never ever had any issues
before. Of course it could be the amp and I haven´t measured
the K3 to confirm if there are any high power spikes
due to poor ALC regulation. I was tuning with fast dots
from the keyer.

Now I was thinking if the TXGain is set too high maybe
that could do something?

I guess I have to investigate but I simply haven´t had
the time.

Jim SM2EKM
--------------------------
Dave Hachadorian wrote:
> I'm getting my K3's set up for the CQWW DX RTTY, and notice 
> that there is a significant variation in power output 
> whenever the FSK goes from mark to space or space to mark. 
> One of these K3's is driving a high gain tetrode amp, and 
> the amp's screen current is jumping all over the place. The 
> power transient is only at the time of transition. The 
> steady-state power of the mark and space are equal.
> 
> I've complained about this before, but it seems to be even 
> worse now. I'm using FW rev 3.30.
> 
> This amplitude modulation has got to be producing some 
> illegal sidebands.
> 
> Dave Hachadorian, K6LL
> Yuma, AZ
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