Elecraft P3 + extras for sale

[Jim Cox]

As new Elecraft P3 Panadapter with P3SVGA Video Adapter / FFT Processor and P3TXMON TX Monitor Power and Waveform Display Adapter (includes the DCHF-2000 1.8-54 MHz, 1- 2000W HF 2000W Max directional coupler). SN 4193.  All cables and manuals. $800 shipped to NA.
Jim K4JAF   850-527-0267
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[Jim Cox]

Unit has been sold..  Thanks all..   Jim K4JAF

-----Original Message-----
From: Jim Cox
Sent: Monday, March 13, 2017 7:00 PM
To: [hidden email]
Subject: [Elecraft] Elecraft P3 + extras for sale

As new Elecraft P3 Panadapter with P3SVGA Video Adapter / FFT Processor and
P3TXMON TX Monitor Power and Waveform Display Adapter (includes the
DCHF-2000 1.8-54 MHz, 1- 2000W HF 2000W Max directional coupler). SN 4193.
All cables and manuals. $800 shipped to NA.
Jim K4JAF   850-527-0267
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[Elecraft mailing list]

I am trying to use my P3 to evaluate signals from other hams here in my
community.  While I know the K3s is excellent, I am not sure what to
expect out of the P3 in terms of phase noise or response under high
signal conditions.  I can always pad to lower the signal but that will
not help with any P3 internal phase.

Any experiences?

Dave K5MWR



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[Jim Brown-10]

Hi Dave,

The P3 is quite good for measurements, and the SVGA card is even
better.  Here's a collection of work I've done with whatever rigs and
amps I could get my hands on to measure.

http://k9yc.com/P3_Spectrum_Measurements.pdf

In my experience, if you keep the K3 within its linear region, you'll
get good data from the P3 if you understand the measurements you're
making.  Limitations -- the dynamic range is 100 dB, but you can only
display 80 dB on screen. For all of the operation I do, I use the P3
with a lot of averaging and a slow waterfall, fairly large waterfall.  
For measurements, I use the P3 in Peak reading mode and let it
accumulate peaks for a while. I make the amplitude display pretty large,
set it for 80 dB, and adjust levels to fill the amplitude screen.

When I'm checking CW bandwidth, I send a series of dits in the range of
35 WPM for at least 20 seconds I reset the peak a second or so after
I've started sending dits so I don't see any initial transient that
might be present. Notice that I set the span for a fairly narrow bandwidth.

The annotations you see for bandwidth are obtained by moving the cursor
to each data point and writing down the readings, and they are the
DIFFERENCE between the high and low points.

If you want to show data more than 80 dB below the peak of the signal,
you can repeat the measurement with the reference level reduced by 20
dB.  More than that and the P3 will overload.

73, Jim K9YC

On Mon,3/13/2017 6:03 PM, K5MWR via Elecraft wrote:
> I am trying to use my P3 to evaluate signals from other hams here in
> my community.  While I know the K3s is excellent, I am not sure what
> to expect out of the P3 in terms of phase noise or response under high
> signal conditions.  I can always pad to lower the signal but that will
> not help with any P3 internal phase.


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[Elecraft mailing list]

Jim

Really appreciate this information and going over it now to make sure I
understand the limits.  The presentation is well done.

How did you capture the SVGA images?

Dave K5MWR



On 3/13/2017 10:53 PM, Jim Brown wrote:

> Hi Dave,
>
> The P3 is quite good for measurements, and the SVGA card is even
> better.  Here's a collection of work I've done with whatever rigs and
> amps I could get my hands on to measure.
>
> http://k9yc.com/P3_Spectrum_Measurements.pdf
>
> In my experience, if you keep the K3 within its linear region, you'll
> get good data from the P3 if you understand the measurements you're
> making.  Limitations -- the dynamic range is 100 dB, but you can only
> display 80 dB on screen. For all of the operation I do, I use the P3
> with a lot of averaging and a slow waterfall, fairly large waterfall.  
> For measurements, I use the P3 in Peak reading mode and let it
> accumulate peaks for a while. I make the amplitude display pretty
> large, set it for 80 dB, and adjust levels to fill the amplitude screen.
>
> When I'm checking CW bandwidth, I send a series of dits in the range
> of 35 WPM for at least 20 seconds I reset the peak a second or so
> after I've started sending dits so I don't see any initial transient
> that might be present. Notice that I set the span for a fairly narrow
> bandwidth.
>
> The annotations you see for bandwidth are obtained by moving the
> cursor to each data point and writing down the readings, and they are
> the DIFFERENCE between the high and low points.
>
> If you want to show data more than 80 dB below the peak of the signal,
> you can repeat the measurement with the reference level reduced by 20
> dB.  More than that and the P3 will overload.
>
> 73, Jim K9YC
>
> On Mon,3/13/2017 6:03 PM, K5MWR via Elecraft wrote:
>> I am trying to use my P3 to evaluate signals from other hams here in
>> my community.  While I know the K3s is excellent, I am not sure what
>> to expect out of the P3 in terms of phase noise or response under
>> high signal conditions. I can always pad to lower the signal but that
>> will not help with any P3 internal phase.
>
>
> ______________________________________________________________
> 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
> Message delivered to [hidden email]
>

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[Jim Brown-10]

On Tue,3/14/2017 8:19 AM, K5MWR via Elecraft wrote:
> Jim
>
> Really appreciate this information and going over it now to make sure
> I understand the limits.  The presentation is well done.

Thanks. But it's not really a presentation, just an easy way to display
the data.
>
> How did you capture the SVGA images?

I plugged a USB memory stick into the P3 USB port. There's a menu
selection to do the capture. I assigned it to one of the soft buttons.

73, Jim K9YC

>
> Dave K5MWR
>
>
>
> On 3/13/2017 10:53 PM, Jim Brown wrote:
>> Hi Dave,
>>
>> The P3 is quite good for measurements, and the SVGA card is even
>> better.  Here's a collection of work I've done with whatever rigs and
>> amps I could get my hands on to measure.
>>
>> http://k9yc.com/P3_Spectrum_Measurements.pdf
>>
>> In my experience, if you keep the K3 within its linear region, you'll
>> get good data from the P3 if you understand the measurements you're
>> making.  Limitations -- the dynamic range is 100 dB, but you can only
>> display 80 dB on screen. For all of the operation I do, I use the P3
>> with a lot of averaging and a slow waterfall, fairly large
>> waterfall.  For measurements, I use the P3 in Peak reading mode and
>> let it accumulate peaks for a while. I make the amplitude display
>> pretty large, set it for 80 dB, and adjust levels to fill the
>> amplitude screen.
>>
>> When I'm checking CW bandwidth, I send a series of dits in the range
>> of 35 WPM for at least 20 seconds I reset the peak a second or so
>> after I've started sending dits so I don't see any initial transient
>> that might be present. Notice that I set the span for a fairly narrow
>> bandwidth.
>>
>> The annotations you see for bandwidth are obtained by moving the
>> cursor to each data point and writing down the readings, and they are
>> the DIFFERENCE between the high and low points.
>>
>> If you want to show data more than 80 dB below the peak of the
>> signal, you can repeat the measurement with the reference level
>> reduced by 20 dB.  More than that and the P3 will overload.
>>
>> 73, Jim K9YC
>>
>> On Mon,3/13/2017 6:03 PM, K5MWR via Elecraft wrote:
>>> I am trying to use my P3 to evaluate signals from other hams here in
>>> my community.  While I know the K3s is excellent, I am not sure what
>>> to expect out of the P3 in terms of phase noise or response under
>>> high signal conditions. I can always pad to lower the signal but
>>> that will not help with any P3 internal phase.
>>
>>
>> ______________________________________________________________
>> 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
>> Message delivered to [hidden email]
>>
>
> ______________________________________________________________
> Elecraft mailing list
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>
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> Message delivered to [hidden email]
>

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