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P3 TX MON envelope display

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N1EU

P3 TX MON envelope display

Can someone with the P3 TX MON please describe the envelope display in
ssb/am modes? Does it work like a real time oscilloscope (dynamic) with
changing display as you speak or does it take static snapshots of the RF
envelope? If static, how often does it update those snapshots?

Thanks & 73,
Barry N1EU
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Don Wilhelm-4

Re: P3 TX MON envelope display

Barry,

I don't have one, but I have seen them in use. The envelope display
looks like what I see on my analog 'scope.
It may be digital, but the refresh rate is fast enough you will not be
able to differentiate it from an analog display.

73,
Don W3FPR

On 2/3/2016 8:26 AM, Barry N1EU wrote:
> Can someone with the P3 TX MON please describe the envelope display in
> ssb/am modes? Does it work like a real time oscilloscope (dynamic) with
> changing display as you speak or does it take static snapshots of the RF
> envelope? If static, how often does it update those snapshots?
>

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Grant Youngman

Re: P3 TX MON envelope display

The envelope display is not a “snapshot”, but it isn’t quite real time either. Close, but if you’re used to using a scope for monitoring, you won’t call it “live”. Also, the vertical height of the display is always normalized to the peak RF signal and there are no sweep width/rate adjustments.

I have not experimented with the CW display modes to see how useful they are.

My opinion is that the P3 envelope display isn’t a match for a scope, and probably wasn’t intended to be. I do like having the SWR/PWR indication on the P3 display, though.

Grant NQ5T
K3 #2091, KX3 #8342

> On Feb 3, 2016, at 7:58 AM, Don Wilhelm <[hidden email]> wrote:
>
> Barry,
>
> I don't have one, but I have seen them in use. The envelope display looks like what I see on my analog 'scope.
> It may be digital, but the refresh rate is fast enough you will not be able to differentiate it from an analog display.
>
> 73,
> Don W3FPR
>
> On 2/3/2016 8:26 AM, Barry N1EU wrote:
>> Can someone with the P3 TX MON please describe the envelope display in
>> ssb/am modes? Does it work like a real time oscilloscope (dynamic) with
>> changing display as you speak or does it take static snapshots of the RF
>> envelope? If static, how often does it update those snapshots?
>>
>

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Alan Bloom

Re: P3 TX MON envelope display

The modulation monitor is like an oscilloscope in that it triggers on
the rising edge of the modulation. So the display is not quite
continuous - after every sweep it waits for the next positive transition
before starting the next sweep.

This is especially useful in CW mode so that the rising edge is stable
on successive sweeps. The P3 has a unique split-display feature where
it can show both the rising edge and the falling edge at the same time,
even when sending slowly.

> ... and there are no sweep width/rate adjustments.

The sweep width is adjusted in the "ModScale" menu entry. (Admittedly
not a very intuitive name. :=)

Alan N1AL

On 02/03/2016 08:50 AM, GRANT YOUNGMAN wrote:

> The envelope display is not a “snapshot”, but it isn’t quite real
> time either. Close, but if you’re used to using a scope for
> monitoring, you won’t call it “live”. Also, the vertical height of
> the display is always normalized to the peak RF signal and there are
> no sweep width/rate adjustments.
>
> I have not experimented with the CW display modes to see how useful
> they are.
>
> My opinion is that the P3 envelope display isn’t a match for a scope,
> and probably wasn’t intended to be. I do like having the SWR/PWR
> indication on the P3 display, though.
>
> Grant NQ5T K3 #2091, KX3 #8342
>
>
>
>
>> On Feb 3, 2016, at 7:58 AM, Don Wilhelm <[hidden email]>
>> wrote:
>>
>> Barry,
>>
>> I don't have one, but I have seen them in use. The envelope
>> display looks like what I see on my analog 'scope. It may be
>> digital, but the refresh rate is fast enough you will not be able
>> to differentiate it from an analog display.
>>
>> 73, Don W3FPR
>>
>> On 2/3/2016 8:26 AM, Barry N1EU wrote:
>>> Can someone with the P3 TX MON please describe the envelope
>>> display in ssb/am modes? Does it work like a real time
>>> oscilloscope (dynamic) with changing display as you speak or does
>>> it take static snapshots of the RF envelope? If static, how
>>> often does it update those snapshots?
>>>
>>
>
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>

Grant Youngman

Re: P3 TX MON envelope display

Missed that. Guess it pays to RTFM :-)

Thanks …
Grant NQ5T
K3 #2091, KX3 #8342

>
>
> The sweep width is adjusted in the "ModScale" menu entry. (Admittedly not a very intuitive name. :=)
>

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Tom Crayner

Re: P3 TX MON envelope display

In reply to this post by N1EU

Out on youtube if you search for "P3 TXMON" you'll find a couple of short
(1 min video) of an operator showing a SSB and CW envelope on a P3 with the
TXMON option installed.

Tom, W2YF

>>>
>>> On 2/3/2016 8:26 AM, Barry N1EU wrote:
>>>
>>>> Can someone with the P3 TX MON please describe the envelope
>>>> display in ssb/am modes? Does it work like a real time
>>>> oscilloscope (dynamic) with changing display as you speak or does
>>>> it take static snapshots of the RF envelope? If static, how
>>>> often does it update those snapshots?
>>>>
>>>>
>>>
>> ______________________________________________________________
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N1EU

Re: P3 TX MON envelope display

Do you have a link to a youtube video showing a phone waveform? The only
video I come up with is https://www.youtube.com/watch?v=CHugxEpj6bg with
NB3R showing only a cw waveform. That's why I posted my question in the
first place, because I've never seen a phone waveform.

Barry N1EU

On Wed, Feb 3, 2016 at 9:54 PM, Tom Crayner <[hidden email]> wrote:

> Out on youtube if you search for "P3 TXMON" you'll find a couple of short
> (1 min video) of an operator showing a SSB and CW envelope on a P3 with the
> TXMON option installed.
>
> Tom, W2YF
>
>
> >>>
> >>> On 2/3/2016 8:26 AM, Barry N1EU wrote:
> >>>
> >>>> Can someone with the P3 TX MON please describe the envelope
> >>>> display in ssb/am modes? Does it work like a real time
> >>>> oscilloscope (dynamic) with changing display as you speak or does
> >>>> it take static snapshots of the RF envelope? If static, how
> >>>> often does it update those snapshots?
> >>>>
> >>>>
> >>>
> >> ______________________________________________________________
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Tom Crayner

Re: P3 TX MON envelope display

In reply to this post by N1EU

Sure. Try:

https://www.youtube.com/watch?v=cx3ZeI3FlHk

Tom, W2YF

On Wed, Feb 3, 2016 at 5:01 PM, Barry N1EU <[hidden email]> wrote:

> Do you have a link to a youtube video showing a phone waveform? The only
> video I come up with is https://www.youtube.com/watch?v=CHugxEpj6bg with
> NB3R showing only a cw waveform. That's why I posted my question in the
> first place, because I've never seen a phone waveform.
>
> Barry N1EU
>
> ______________________________________________________________
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>

N1EU

Re: P3 TX MON envelope display

Thanks Tom! That's just what I was looking for.

73, Barry N1EU

On Wed, Feb 3, 2016 at 10:05 PM, Tom Crayner <[hidden email]> wrote:

> Sure. Try:
>
> https://www.youtube.com/watch?v=cx3ZeI3FlHk
>
> Tom, W2YF
>
>
> On Wed, Feb 3, 2016 at 5:01 PM, Barry N1EU <[hidden email]> wrote:
>
> > Do you have a link to a youtube video showing a phone waveform? The only
> > video I come up with is https://www.youtube.com/watch?v=CHugxEpj6bg with
> > NB3R showing only a cw waveform. That's why I posted my question in the
> > first place, because I've never seen a phone waveform.
> >
> > Barry N1EU
> >
> > ______________________________________________________________
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> >
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> > Message delivered to [hidden email]
> >
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Richard Fjeld-2

Re: P3 TX MON envelope display

In reply to this post by Grant Youngman

Is there a link to some photos where I can see what this looks like? I
did not know about the SWR/PWR indication.

As for the envelope display, I would expect it to be good enough to
indicate trouble or not. Years back, I ran a Heath SB-610 which saved
my finals one time.
The rig went into self oscillation during transmit and I wouldn't have
known until too late.

Dick, n0ce

On 2/3/2016 10:50 AM, GRANT YOUNGMAN wrote:
> My opinion is that the P3 envelope display isn’t a match for a scope, and probably wasn’t intended to be. I do like having the SWR/PWR indication on the P3 display, though.

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Richard Fjeld-2

P3 TX MON envelope display

P3 TX MON envelope display

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