[Elecraft] P3 Continuosly Offset Waterfall Trace

[Alan Bloom]

Is there anything connected to the IF OUT connector on the P3?  We've
had reports of the LO signal from, for example, an LP-PAN leaking into
the P3 via that path.

Alan N1AL


On Sun, 2010-09-12 at 11:24 -0700, K4SC wrote:
> The subject is terse, so here is what is happening.  I notice a very narrow
> but steady vertical line on my waterfall which does not move when I QSY. 
> This occurs only in CW mode and I can see it when the SPAN is narrow, ±5 kHz
> or less.  It appears to vary between bands but in the range of -600 to -800
> Hz from the center frequency.  All other real signals track when I move the
> VFO, but this one just stays there, as if you drew a vertical line on the
> display.
> 
> As I am writing this description it occurred to me that it may be related to
> the CW sidetone, and sure enough, when I adjust the PITCH, the offset varies
> in relation to the center frequency of the P3 display.  In other words, when
> I raise the PITCH frequency the trace moves upwards; decreasing the delta
> between center and trace frequencies, and vice versa.   I put the radio in
> REVERSE CW mode to see if the trace would move to the positive side of the
> center frequency, but it just disappears.
> 
> I am a total novice to panadaptors or spectrum analyzers, so if this is a
> normal "thing", I am unaware.  It really does no harm, but I noticed it
> because I am using the waterfall a lot this weekend during the SKCC Weekend
> Sprint and I mistook it for a carrier that could never be heard.
> 
> I can not say whether it has been there all along or is a new quirk, as I
> just noticed it today.  I have removed and replaced all connections to the
> P3, ensuring their proper fit and tightness.
> 
> Any thoughts?  
> -- 
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