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P3: Peak hold question

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Craig-89

P3: Peak hold question

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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Alan Bloom

Re: P3: Peak hold question

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
>
>
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

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Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Craig-89

Re: P3: Peak hold question

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 <[hidden email]> wrote:

> From: Alan Bloom <[hidden email]>
> Subject: Re: [Elecraft] P3: Peak hold question
> To: "Craig" <[hidden email]>
> Cc: [hidden email]
> 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
> >
> >
> >
> >
> >
> >
> ______________________________________________________________
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:[hidden email]
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
>
>
>