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David, The SD card routines have been tweaked to work with most TF cards in SPI mode. Unfortunately, not all cards support that mode of operation. Most newer cards do support SPI mode.

I could not find any of my SanDisk 16gb cards that would work. Switched to a Samsung 32gb and it worked perfectly.

Yes, I'd put the 20 dB pad on the UUT output (i.e. the CH1 port, not the CH0 port).聽 Then you do a calibration (with the pad in place).聽 Measure your UUT, add 20 dB to the S21 magnitude. You could

I think Jim was saying two things: 1) Calibrate it normally and then measure a known device, like e a 20dB attenuator, and see if you get a sane result. 2) If measuring a (say) 20dB amplifier, put

Hi , in my opinion , calibrate the S11 port , with 20 dB of attenuation applied , make non sense . Maurizio

If you check with a thru and/or a pad, do you get the right values (i.e. did you not damage anything). You can put 20 dB attenuation at the output of your amplifier under test. Calibrate (Short, open,

Trying to use log mag and not working now. I think I overload S21 with more then 10db. What is the fix anyone now? I鈥檓 hoping some simple right at the port

For information only: Ham-Con this year will be both in-person and online. It is scheduled on Feb, 26th, 2022. Before Feb 20th, entrance is $6, after it is $10. See all the information on

Did anyone read my initial reply to this thread? All this was there, but not using the TDR. Dave - W脴LEV -- *Dave - W�

This one is very easy to answer as a cable engineer having used both TDR and OTDR Test Equipment in the past. All you do is get an exact known length of cable, attach it to your TDR, dial in a vp

Hi Bob, What I wrote about the 150m is not a calculation of a cable length. I was showing that the electrical length is 200m for a physical length of 150m. :-) About the quality of the nanoVNA H3.2

Boy, the guys at CERN should have bought a Na

Hey Daniel: Yes, there is an accessible piece of software for the NanoVna built by a member of this list Bruce KC1FSZ. I am also a blind op and now use Bruce's software very effectively with my

Hello I have a white stick operator friend who has a talking kenwood radio, uk amplifier screen reader compatible linear. He would like to know if there is any suitable windows software. I tried NVDA

Great, thanks!

That was the situation when I tried that concept. Thunderstorms etc. :-) Arie Op 10-2-2022 om 21:32 schreef W0LEV:

Unless you live in an extremely RFI prone and RFI polluted area, you won't hear "antenna noise" on a crystal set. Further, the crystal set runs on voltage so the high-Z antenna is quite appropriate,

Hi Andy, I understand that you are talking about a crystal radio being an LC-circuit, a diode plus capacitor and a headset? You could measure the imput impedance of that receiver. Thing is that a

Hi Dave And that port is designed to look at a 50 Ohm load, not look like a 50 Ohm load! Sweeping the front end of most radios just gives you an idea of their preseclection.聽 聽 聽Kent WA5VJB

They don't try. It's that simple. I've measured only one "vintage" radio of some 30 that put S-9 close to -73 dBm. That was the Swan 100MX. Of course, the rest of the S-Meter response is wonkered as