开云体育

I'm used average for calibration and it works great. But it takes more time for measurement. So I upload firmware with average, calibrate it with disconnected USB cable and then upload normal

CH0 50 OHM CH1 50 OHM

The manual optimization took way too much time so I learned how to do non-linear least squares multiparameter fit in Octave. The created Octave scripts are attached. Loaddata.m loads the uncalibrated

On the Smith Chart, the short is at 9 o'clock and the open is at 3 o'clock. This is the way it is supposed to be. 180 degrees. Mel, K6KBE

The same screenshot (CH0 LOGMAG and CH1 LOGMAG after CAL RESET) for other devices are also welcome, it will allows to get statistics about RF frontend on different devices

That's very interesting. Calibration with NanoVNA-Q should be a little better than with NanoVNA-H firmware. Can you show me please screenshot of NanoVNA-Q with CH0 LOGMAG and CH1 LOGMAG after CAL

You are correct. I seemed to be having difficulty calibrating with NanoVNA-Q-0.4.2-bf9c4ba, so I flashed with NanoVNA-H_v0.2.3-2-g8ac9166_20191018. I got what seemed to be a good cal. I then saw

Averaging seems less powerful than I expected; 100 is quite different from 10 for e.g. CH1 terminated by 50 Ohms:

Charge doesn't depends on firmware and firmware don't works while NanoVNA is switched off. Charge process is controlled with IP5303 chip and doesn't depends on firmware at all. You will get exactly

you can buy Chinese si5351 module: https://www.aliexpress.com/item/32972854971.html with a simple arduino STM32 you can easily control it (through USB or without, as you wish):

That is a problem with the charge/inverter chip. A number of users have the same issue and have had to add a momentary switch between pin5, through a 5K R to ground to turn on and off. Per hugen - try

There may be a problem with NanoVNA-Q v 0.4.2. Left nanovna switched off but connected to running PC for about 3 hours. After 3 hours the charge LED was still flashing and the device would not switch

1N4148

Well this is embarrassing! It turns out that an SMA 50ohm load and through connector were included in the package that I purchased. They were attached to one of the short cables and I didn't notice

Pierre, Check out the Erasynth-Micro <https://www.crowdsupply.com/era-instruments/erasynth-micro> You can control it via the touch screen or USB serial port commands. The lowest frequeny is 12.5Mhz.

This $36 ADF4351 Development Board 35MHz - 4.4GHz would require firmware integration with corresponding flexibility: https://www.ebay.com/itm/264041253972

tnx peddja

I don't know the chip, but this $46 board claims 140MHz~4.4GHz sinusoidal outputs, presumably could mix for lower.. https://www.ebay.com/itm/292970512439

Minicircuits has a SSG-4000HP generator that is similar, except it covers 250 MHz to 4000 MHz and is a lot more expensive.

yes, hardware check for si5351 is included