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I tried the S21 method. Connected the 2 center pins (CH0 and CH1) to the choke ends (coax shield on both ends). -20dB at the frequency of interest is a decent common mode attenuation. -30dB is good.

Yes, that's all you need. I ran a similar case with a single strand of #22 AWG with and without the addition of the lossy core material. Although very nice particularly for looking at common mode

Yes, I am familiar with the "other" PN systems. Thanks for the clarification. I assumed this was test set limited, however, just to be sure. Regards, Alan

A poor mans test jig for checking if these cheap chinese chokes do anything. Two SMA female chassis connectors with the ground pins soldered together and a short wire connecting the center pins. The

Can you show the measurement? preferably the smith chart of another VNA doing the CH0 measurement.

It makes a lot of sense. From 0-300MHz you get the 2mA drive fundamental and its harmonics From 300-900MHz you get8mA drive with fundamentals from 100-300MHz and its harmonics from 300-900MHz So

Bruce, There were a couple of accompanying articles to the previous one that go into further detail.

It seems that CH0 output also has impedance about 40 Ohm. So, it's better to use two 10 dB attenuators. One on the CH0 and the second on CH1.

The source may be DC-DC convertor. Try to disconnect external power from NanoVNA, is it still present?

I think noise may come from DC-DC converter used in battery charger. Because there is noticeable higher noise when external power supply is connected and this noise is not come through cable. It is

I opened the nanoVNA and connected the line in of a good USB audio device to the reference SA612. But as I did not dare to do two connections the unbalanced signal had a lot of noise. And there were

Hello, Allow us, please, to point out that to be possible to the slightest a comparison between measurements regarding nanovna and/or vna, these measurements should be accompanied by an estimation of

does only scalar measurements

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Ouch! Bear Burt, K6OQK -- Sent from my Android thingamabob with K-9 Mail. Please pardon the spelling errors as the dog can't spell so good.

Analog devices has a bridge and detector IC ADL5920, is this useful. It goes from 9kHz to 7GHz.

Caution is the keyword. FWIW I heard long ago that nylon underwear can generate 3000 volts. Bear Albrecht W5VZB New Mexico

Bruce, This link might interest you, http://www.reeve.com/Documents/Articles%20Papers/Ferrite%20Beads/Reeve-Hagen_FerriteBeads_P1.pdf . It describes a fixture and procedure for measuring ferrite beads

Just so I understand, would I connect only the outer shield to the center pin of the two ports, leaving the center of the coax floating unconnected?

These peaks are from spurs of the SI5351 output so they move with the IF frequency and happen at 1kHz intervals. You see them (although lower) also for the 8kHz and 12kHz harmonics of the IF The lower