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I've been using the NanoVNA for a bit but I've found when calibrating, the "open" value isn't working reliably when using cables or when using extended adapters (like SMA extension for a male to male,

Yes AL values of commercial toroids do vary quite a bit. I have found the need to add or subtract one or two turns to get the correct inductance values. Each mix is designed for a certain frequency

Wouldn't you want to know what the resistive component of S21 is? Dale W4OP

I was just looking into this the last few days to create a range of equipment I have SOL set and pleasantly see this message thread in my email. From my understanding, for above UHF work, the

Hi, I do CMC-measurments by simply connecting the coax outer braid to the center of CH0 and CH1 and then trace 1 on LOGMAG and Channel 1 THROGH, see attached pictures. In my case the CMC is with

Clip leads rock — for audio. Larry's advice is excellent. Bear W5VZB

In the files area, you will find the Console Commands document where the clearconfig command is explained. In the WIKI area, you will find references to all the firmware developers. Please refer to

Kevin, Take a look at the photo’s at http://www.hamcom.dk/VNWA/SOT259%20calibration%20standards.pdf Robert PA7RG

Hello Larry, Firstly I do thank you very much for taking the trouble to reply. The answer to your first question is that I find nothing in the files area that is later than the versions that I have

Hi Igor, I can help with the search by typing the key words "common mode choke impedance" or shorter will result in more results in the Search window. In the -F group, I see no such match. Great

Hi, Does anybody use this device to measure common mode choke impedance? G3TXQ for instance suggested using |S21| and phase angle to recalculate X and R of the DUT in the spreadsheet. NANO VNA-F

Thanks! A great remember that realistically I won't notice much of a difference for the amount of work.

Kevin, don't worry so much about all this.? It's a hobby, and a PL-259 isn't so terrible that it will cause problems.? I have used them with good results up to 70 cm.? Type N is better but you

The music makes the videos almost unbearable

RL = 10 log (Preflected/Pforward) = 20 log Rho= a negative qty because Preflected is < Pforward or Rho, the reflection coefficient is <1. But because it is a LOSS it is stated as positive.

I was going to switch them all to N connectors, on that note, is that still what's recommended? but then would have to do every radio and antenna. When I setup my new tower will probably make the

Be aware that PL259 / SO239 connectors are NOT impedance controlled! They are NOT appropriate for use at 70 cm! Even at 2-meters, they will introduce measurable loss in mismatches. They're OK for HF,

Thanks for the explanation and help. It will be primarily for 2m and 70cm. Based on the help looks like the best bet will be 2, 100s parallel.

What frequency will you be using? Two 100 ohm surface mount resistors opposite of each other has less inductance Mike N2MS

They recommend 2 100 ohm in parallel to reduce the stray capacitance that will distort the higher frequency results.