[Elecraft] XV144 drops power if "PWR" is moved during xmit in USB mode

[Dale Boresz]

Bob,

Just another data point ...

I also run the XV144 w/ my K3. I tried your test in SSB mode and CW 
mode, and in both cases, turning the PWR knob on the K3 while modulating 
or key-down (on cw) simply changes the power to the xvtr as evidenced by 
the change in the number of LED's that are lit. I was unable to cause it 
to just drop as you have experienced.

73, Dale  WA8SRA


On 2/26/2013 11:41 AM, KD7YZ Bob wrote:
> Howdy K3' people:
>
> Here's another anomoly I can not figure out.
>
> Thus by the way does NOT happen with my xv432 module.
>
> Put xv144 in USB mode.
>
> Use WSJT9 and put it in echo mode.
> Set it to "Auto On" which simply sends a few seconds of a single-note
> Tone then waits to see if something comes back from the moon.  Then
> transmits again, then listens .. and so forth.
>
> I was looking at the LED bars on the XV144 and decided to up the power.
> As soon as my fingers touched the PWR knob, the XV144 ceased output,
> verified on watt meter also.
>
> WSJT9-echo-mode waited then transmitted again. No power out.
>
> Stopping WSJT9 and restarting di not help the lack of power out of the
> xv144.
>
> However, if I held-down "XMIT" ... to Tune, then instantly the LEDS all
> it up and the watt meter was happy.
>
> So I went to the WSJT9 window and pressed to Auto-run     again. Echo
> mode started with full power from the xv144 transverter.   I let it go
> ten or fifteen times.
>
> Then I touched the PW knob and began the who sequence all over ... no
> power out.
>
> So I switched Bands to 28 ... started Echo Mode and it went thru its off
> and on sequences a few times.
>
> Then I rotated the PWR knob on the K3 and the Power FROM the K3 varied as
> much as I had the patience to rotate the PWR knob.
>
> But, as I said, I could not replicate this on the XV432.
>
> Next I set Mode to SSB and used a microphone/headset to produce speaking
> and whistle-tones.
>
> While I was pinning the meter, so to speak, which whistles, I rotated
> the power knob and Voila!!! reduced or no power. Ever again .. until I
> held XMIT (Tune).
>
> Thereafter I could key the K3 and shout in the heil headset to make 25
> watts out appear.
>
> Until I rotated the knob and the xv144 transverter ceased output.
>
> This is repeatable on the xv144.
>
>
>
>
>