P3TXMON question?

[VE3WDM]

Good morning to the group, my P3TXMON just arrived the other day and today it was installed and it works and looks great! I do have a question....the power reading is Peak-Peak is there a way to switch to RMS? If not is it possible to make a request to have this looked at by the Elecraft folks and possibly added to an update?
Mike Weir
VE3WDM
     
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[Jerry Moore]

Mike, to get RMS just multiple by .707

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Mike
Weir
Sent: Friday, August 21, 2015 11:07 AM
To: [hidden email]
Subject: [Elecraft] P3TXMON question?

Good morning to the group, my P3TXMON just arrived the other day and today
it was installed and it works and looks great! I do have a question....the
power reading is Peak-Peak is there a way to switch to RMS? If not is it
possible to make a request to have this looked at by the Elecraft folks and
possibly added to an update?
Mike Weir
VE3WDM
     
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[Chester Alderman]

Mke....

I am not absolutely sure about this, but on page 29 of the Rev. E, July
14,2015 'High Performance Panadapter' manual, in the second column it states
"The power output bar graph shows both the current power with the moving bar
and the peak power achieved with a narrow bar." The insinuation is the
'moving bar' indicates RMS power and then states that the single narrow bar
indicates 'peak' power?  Hopefully Elecraft will soon clarify this for us.

73,
Tom - W4BQF


-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Mike
Weir
Sent: Friday, August 21, 2015 11:07 AM
To: [hidden email]
Subject: [Elecraft] P3TXMON question?

Good morning to the group, my P3TXMON just arrived the other day and today
it was installed and it works and looks great! I do have a question....the
power reading is Peak-Peak is there a way to switch to RMS? If not is it
possible to make a request to have this looked at by the Elecraft folks and
possibly added to an update?
Mike Weir
VE3WDM
     
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[Fred Townsend-2]

Jerry 0.707 works if you have a pure sinewave i.e. CW. However modulated
signals, i.e. SSB, are not sinewaves. I think he is looking for a true RMS
reading.
73
Fred, AE6QL

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Jerry
Moore
Sent: Friday, August 21, 2015 8:25 AM
To: 'Mike Weir'; [hidden email]
Subject: Re: [Elecraft] P3TXMON question?

Mike, to get RMS just multiple by .707

-----Original Message-----
From: Elecraft [mailto:[hidden email]] On Behalf Of Mike
Weir
Sent: Friday, August 21, 2015 11:07 AM
To: [hidden email]
Subject: [Elecraft] P3TXMON question?

Good morning to the group, my P3TXMON just arrived the other day and today
it was installed and it works and looks great! I do have a question....the
power reading is Peak-Peak is there a way to switch to RMS? If not is it
possible to make a request to have this looked at by the Elecraft folks and
possibly added to an update?
Mike Weir
VE3WDM
     
______________________________________________________________
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[Alan Bloom-2]

The narrow bar is PEP (peak envelope power) with a long time constant.
The solid bar is effectively also PEP, but with a shorter time constant
so you can see what the modulation/keying is doing.

By the way, in the radio industry, the term "peak" is used in more than
one sense, which can be confusing.  PEP is the peak of the transmitted
power, which is computed from the RMS value of the RF voltage, not the
peak value.

For example, on an oscilloscope display you see the peaks of the sine
waves, which are sqrt(2) = 1.414 times the RMS voltage.  To use an
oscilloscope to measure RF power (PEP or average) you have to divide the
peak voltage by sqrt(2) before using the formula P = E^2 / R.

Alan N1AL


On 08/21/2015 08:43 AM, Chester Alderman wrote:

> Mke....
>
> I am not absolutely sure about this, but on page 29 of the Rev. E, July
> 14,2015 'High Performance Panadapter' manual, in the second column it states
> "The power output bar graph shows both the current power with the moving bar
> and the peak power achieved with a narrow bar." The insinuation is the
> 'moving bar' indicates RMS power and then states that the single narrow bar
> indicates 'peak' power?  Hopefully Elecraft will soon clarify this for us.
>
> 73,
> Tom - W4BQF

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