and I have an Ebay special GPSDO, which is ridiculously accurate.
But I
don't know how pure it is.
- Jerry KF6VB
On 2022-06-07 17:14, Wes wrote:
Sure, but how do you quantify the "relatively pure" source if you
build one? Typically you want it to be 10 dB better than
Sure, but how do you quantify the "relatively pure" source if you build one?
Typically you want it to be 10 dB better than what you are measuring (or the
measuring instrument).
The other option is a commercial source with published specs. For example I
have an ebay special Morion MV89 10
That is one of the reasons I am not going the nanoVNA route... I
suspect the P3 is a far better measurement tool.
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 15:07, Jim
On 6/7/2022 1:56 PM, Wes wrote:
But...what you measure are the results of phase fluctuations in the DUT
*plus* the phase fluctuations in the measurement system's oscillators
and/or sampling clock jitter. This is the K3/P3.
Yes
73, Jim K9YC
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)
On 2022-06-07 13:56, Wes wrote:
*plus* the phase
fluctuations in the measurement system's oscillators and/or sampling
clock jitter. This is the K3/P3.
*** I wonder if the noise of the K3/P3 could be measured using a
relatively pure
signal source - then once that's known, you would subtract
I can't answer the first two and Al has given the answer to the third.
But, you're not going to be measuring phase noise in the strictest sense, but
what ARRL calls composite-noise. Interesting they *do* actually measure phase
noise with an HP11848 Phase noise test set and then they assume
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
Al,
THANK YOU Also, thanks for the formula! :)
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 08:18, Al Lorona wrote:
According to Al, N1AL, "The effective bandwidth
According to Al, N1AL, "The effective bandwidth of the P3 is approximately one
pixel on the display, which is SPAN/468. So, for example, if the span is 47
kHz, the effective bandwidth is about 100 Hz."
To "convert" or "correct" to a 1 Hz bandwidth, use the formula:
BW_correction_factor = 10 *
Hi,
I am contemplating practicing some phase noise measurements using a P3.
If I correctly understand the measurement, (which I may not), I should
express the result, using db down from peak, so many Hz away from peak,
using a 1 Hz width.
First question; is the above correct?
Second
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