[Elecraft] [K3] K3 FSK power transients

[Phil NA4M]

Dave -

I experience the same issue and Elecraft indicated that the FSK mark/space
power fluctuations are caused by the transmit filter's passband ripple and
where the transmit signal falls within the filter's passband.  I'm using the
standard 5 pole 2.7khz filter.  They indicated the 8 pole filter should be
flatter.

73 Phil NA4M 



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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