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Using high-quality RF capacitors? Or common MLCCs? Voltage rating? I just ask because cheap capacitors can be *very* non-linear - like a effective capacitance ratio of 1:5 across the allowed voltage

To be clear, by -spacing- I mean the step size between each of the (101 or so) test frequencies, not the min to max frequency difference. --John Gord

Jerry, I think the -spacing- between the test frequencies is what sets the maximum length. --John Gord

From: bob playing with TDR mode on nanovna-saver... how are the sweep settings supposed to affect the TDR graph/resolution? =================================== Bob, Very approximately: low

In some rare cases not start or si5351 or AIC3204. In this case no sweep. You can touch screen, and see menu. But no trace on it. If made off/on all startup normally. If you already check touch issue

That screen looks very scuffed for a brand new device, are you sure there's not a screen protector on it? ________________________________ Sent: 21 September 2020 08:21 To: [email protected]

I would normally think that Neil's upper frequency limit only sets the resolution of the time domain response that gets displayed. And that it is the lower frequency limit that determines the maximum

Here's a simplification of Neil's formula for stop frequency. Length is in meters or in feet, velocity factor is a decimal number such as 0.66, result is in mhz. fmhz = 38376*vf/feet fmhz =

John, thanks for your original suggestion and the followup. I have found it very useful. While experimenting with it, I noted the extremely limited range of the original setup and found a method

playing with TDR mode on nanovna-saver... how are the sweep settings supposed to affect the TDR graph/resolution? how should sweep settions be set for TDR? be run at one frequency ? what is the

Followup - I had two cases where the TDR measurement verified itself. First was a length of RG58 that I had that had damage to the insulation at a spot somewhere in the middle. As a test, I shorted

the '39' was an empirical value derived from the results of a number of tests. I'm sure there is a technical reason behind it, but I don't understand all the details of the original setup described by

Here's the post of April 8 2020 that Neil has cited (there's 17 posts in the thread): /g/nanovna-users/topic/72891049#12494 John started another thread on Aug 31 2020 (no

You may want to look at Fair Radio Sales. They have an interesting and ever changing mix of military surplus cables and connectors: https://fairradio.com/ -pat N8PN

i am thinking he has the Smith chart turned off 73, Bill KU8H bark less - wag more

Hello! could you take a detailed photo of the PCB? -- С Уважением Донецкий Денис. понедельник, 21 сентября 2020г., 12:57 +03:00 от yachnakr@... :

I can reproduce what happens to you, if I leave the screen pressed when turning on the nanovna.

He probably needs to enable at least 1 marker to see anything useful.

Can you connect the nanovna to the USB? Maybe start with the command clearconfig? Or also force the DFU mode through the jumper of the "booto" and "vdd" pins to try to update the equipment's FW.

Try The RF Connection: https://rfconnection.com/ email at: rfc@... Wide selection of connectors and coax types. Disclosure: I know Joel (w3rfc) and buy from him regularly. Bob,