[Elecraft] [Elecraft_K3] A Different View--K3 Reduced-bandwidthRTTY Analysis

[Dave Hachadorian]

>I notice that in the narrower signal spectrun the two tone peaks 
>have the same amplitude.

>Many of us have wondered why our watt meters diddled like the 
>RTTY tones.

>Hopefully that is fixed too.

That is not fixed.  I have two K3's, and have been running 
reduced bandwidth firmware for a couple of months now.  An LED 
wattmeter still shows significant flickering as RTTY is being 
sent, and screen current on a tetrode amp shows a lot of 
variation on its analog meter.

What I see, on both K3's here, is a brief 7% power spike upward 
when the FSK input is shorted,  and a brief 7% power spike 
downward when the FSK input is opened.  Steady-state mark and 
space rf amplitudes are equal. The transients occur only at the 
transitions.  This experiment was repeated with DSP v 2.81 and is 
unchanged from earlier versions.  I guess, if the signal is 
clean, it's nothing to worry about, but it sure looks weird to 
see all that flickering going on.  I remember on my old TS-850, I 
could check amplifier tuning while rtty was being sent, but with 
the K3, I don't feel comfortable doing that.


Dave Hachadorian, K6LL
Yuma, Arizona












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