[Elecraft] P3: Peak hold question

[Craig]

Hi Alan

Thanks for the update and explanation.

When I get this flat peak trace I find no corresponding signal in the waterfall display.  

I don't understand how the trace can be driven to such a flat level by a signal that does not show on the waterfall. 

I can clearly see all the frequency hoppers and radiosondes on the waterfall and peak display. Why  the signal that flat lines  the peak display is not displayed on the waterfall is a mystery.

I will investigate further and see if I can photograph the event when it next happens. It may be a fast transient  signal from within my own  shack.



73
Craig



--- On Mon, 9/27/10, Alan Bloom <n1al at cds1.net> wrote:

> From: Alan Bloom <n1al at cds1.net>
> Subject: Re: [Elecraft] P3: Peak hold question
> To: "Craig" <vk3he at yahoo.com>
> Cc: elecraft at mailman.qth.net
> Date: Monday, September 27, 2010, 2:07 AM
> Hi Craig,
> 
> The peak hold has an "infinite" hold time so it shows the
> biggest peak
> since it was first enabled.  One of the items "on the
> list" is a
> "peak-sag" mode where the peak value will not hold
> indefinitely but will
> gradually sag down so that if strong signals go away, it
> will reset
> eventually.
> 
> Alan N1AL
> 
> 
> On Sat, 2010-09-25 at 17:30 -0700, Craig wrote:
> > Hi 
> > 
> > When I run the P3 for an extended period of time of 10
> to 15 minutes, it seems that the Peak hold blue/cyan trace
> resets or freezes.
> > 
> >  The peak hold trace goes flatline well above the
> highest signal peak after a long run. Is this normal
> behavior ? The peak hold trace might have a buffer that
> fills up that causes the trace to freeze or reset?
> > 
> > I like leaving the peak hold trace running
> continuously since the Peak correlates more closely to the
> S-meter's true reading. My P3 reads -80dbm for a S9(-73dbm)
> signal input.
> > 
> >  I just got my  P3 so might have missed
> something by not reading the manual properly.
> > 
> > 
> > 
> > 73
> > Craig
> > VK3HE
> > 
> > 
> > 
> > 
> >       
> >
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