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With thershold more than 300 MHz si5351 will use wrong frequency. Hardware works ok, so there is no PLL icon, but it uses wrong frequencies, so it won't works properly. Some invalid thereshold values

But I think, most of all, this issue is related to some garbage in the settings (bad configuration settings). Another way to fix bad configuration settings is to cleanup all memory before firmware

FWIW, by setting 'threshold 330000000', my nanoVNA gets crazy CH0 and CH1 logmag and Smith @ 983140600 Hz but no PLL icon, perhaps because power-on default scan does not go over 100MHz.

yes

------------------------------------------------------------------------------------------ Does that mean that if threshold frequency is set to 250 MHz then instead of 3 x 300 MHz = 900 MHz the

Yes, this is not possible to get more that 101 points with data command. Because firmware has fixed 101 points and you cannot change that. You can use NanoVNA-Q firmware, it has scanraw command which

SMA connectors are fragile, and provided load spins in nanoVNA female socket. Some folks reduce CH0 SMA connector wear by adding male-female adapter. For frequent recalibration and BNC-equipped DUTs,

Also, you can try to setup START and STOP frequency in the STIMULUS menu, if PLL icon disappears after that, it means that your configuration has invalid frequencies and it's recommended to cleanup

thanks for the info, I did not think I would be the only one Thanks Dave 2E0DMB

This PLL icon means that si5351 failed to setup some frequencies during sweep. There are two possible reasons: 1) bad configuration settings (it may store invalid frequencies for the sweep) 2) bad

the load I got happens to have bad contact internally too, reacts when shaking or knocking at the table. Recommend use of better SMA-Loads for calibration. See RF-Parts or other dealer

Hi My 50 ohm cal load failed that I got in the kit, has anyone had this happen to them ? Thanks Dave 2E0DMB

Hi , now I upgraded to 3.0.1 , but the problem is still present. I think is not possibile to have more than 101 points. And sweep cmd , not allow to set step size , but agin number of points. Now I

QRP has 'scanraw' command, which is more powerful than edy555 'scan' https://github.com/qrp73/NanoVNA-Q/releases

------------------------------------------------------------------------------------- QRP's 0.4.2 firmware includes a hardware check for the si5351. It tests if your NanoVNA will operate reliably

Just got my money back from the last bogus eBay listing at $19.95! Roy WA0YMH

Hi KE8CPD - That is also the first time I have seen it, but it explains your crazy plot. QRP added a check for those clock chips which cannot do 300MHz. The workaround is set 'threshold' from USB

#70: facupov : a 64-bit working maxima under windows in 2 cases Hello, Allow us, please, to inform you that after hard days-and-nights of many-many trials-and-errors, including tedious searching for

I flashed the attached firmware and took a screen capture. Please see attached. Not sure what the PLL means in this firmware but that is the first time seeing it.

Just ordered one for fun at $15.99... ref 254398992632