[Elecraft] P3 - Displaying my signal

[Gary Ferdinand]

Alan, I'm using QSK not semi break in.  Does that matter at all? Interesting usage of it though!

Gary W2CS


> -----Original Message-----
> From: Alan Bloom [mailto:alan at elecraft.com]
> Sent: Wednesday, October 13, 2010 2:04 PM
> To: Gary Ferdinand
> Cc: Elecraft
> Subject: Re: [Elecraft] P3 - Displaying my signal
> 
> The P3 is supposed to freeze when the K3 is transmitting.  However,
> when
> the K3 is set for CW semi break in, it unfreezes after the first
> character.  This is a bug not a feature.  :=)
> 
> If you would like to view your transmitted signal for test purposes,
> you
> can do it by temporarily disconnecting the RS-232 cable to the K3.
> That
> disables the freeze-on-transmit function.  What you are viewing is
> stray
> IF leakage coming out the K3's IF OUT connector.  The signal level is
> rather low and varies with drive level, frequency band, and the
> particular K3.
> 
> However, I do find it useful for adjusting the transmit equalizer.
> With
> my K3 set for SSB, I turned on peak hold on the P3 and talked into the
> mic for a few seconds.  The peak value is a fair representation of the
> transmitted spectrum.  I could see that it was way too bassy (low audio
> frequencies stronger than the highs) which results in a muddy-sounding
> signal that lacks "punch".  It took maybe 5 minutes playing around with
> the K3 TX equalizer to get a nice flat spectrum.
> 
> Alan N1AL
> 
> 
> On Wed, 2010-10-13 at 13:22 -0400, Gary Ferdinand wrote:
> > A new feature seems to have appeared with my K3/P3 combo, both
> factory
> > assembled.  Whenever I key the K3 on an empty daytime 80 meter band,
> I get a
> > narrow, but strong waveform down about 300-400 Hz from the marked
> carrier
> > frequency.   If I hold key down for a few seconds the spike builds to
> about
> > -80dBm from a noise base of about -130dBm.    I searched the archives
> but
> > all I saw was something about a phantom signal.  This is not phantom
> at all.
> > Of course it also shows brilliantly in the waterfall display.
> >
> > I have checked that all cables and power connected to both units are
> well
> > attached.  Also, this feature appears to be new, have been created
> overnight
> > by Murphy.  All suggestions welcome.  Thanks.
> >
> > Gary W2CS
> >
> >
> >
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