[Elecraft] P3 as a phase noise measurement tool

[Dave (NK7Z)]

Jim,
Thanks for your answer!  Also, thanks for your past work!!

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 6/7/22 12:13, Jim Brown wrote:
> On 6/7/2022 8:04 AM, Dave (NK7Z) wrote:
>> Thanks in advance for any help in this...
> 
> I use a P3/SVGA to measure signal bandwidth (and before I had the SVGA 
> board, used the P3). It's dynamic range is 100 dB, but the screen can 
> display only 80 dB. A rig with decent phase noise performance is well 
> below that.
> 
> See http://k9yc.com/TXNoise.pdf  which compiles measurements done in 
> ARRL Labs. The plotted data are ARRL measurements in electronic form for 
> a dozen or so rigs, re-plotted on the same graph. I did this work in 
> 2014; it was motivated in part by complaints by WRTC participants, and 
> the rigs chosen were those they used, and other mainstream rigs popular 
> at the time.
> 
> Phase noise from a CW signal is heard as a "whooshing" sound away from 
> the signal, and is what makes cheap rigs unwelcome on Field Day. It 
> extends hundreds of kHz away from the transmitter frequency. It's also 
> present, of course, on SSB and digital modes, and is also present in 
> receive.
> 
> This was a LOT of work that required a lot of cooperation with ARRL 
> Labs, and I have no interest in re-doing it for today's rigs.
> 
> 73, Jim K9YC
> 
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