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On 23/10/2019 20:21, John Nightingale via Groups.Io wrote: --------------snip------------------ >>>> A little note for new Linux users who find that Rune's application > is not seeing the NanoVNA when

Kurt wanted to see some pictures so here they are. The first picture is the dB logmag of S11 of a 30cm semi rigid cable (medium) and a 1 meter RG58 cable (long), both Open and Short at the end, both

It looks like cheap Chinese SMA-terminators. If so, they have bad performance. Try to measure it with multimeter, does it have 50.0 ohm? Most of all it has high error, something like ±5 ohm.

Mine failed also - a piece of junk. Bought my own online.

You can do scanraw for O,S,L cal-kit loads and use these results to calculate calibration corrections. After that just apply these corrections to a scanraw result.

at RFPARTS to buy for 3,95$ Had recently gained bad experiece with cheap SMA-load baught via ebay (aro 1$ a piece), none of them had 50ohms, so I discarded them, contacted the ebay dealer for

---------------------------------------------------------------------------------------------------------------------- Its great that the scanraw command allows you to return more than 101 measurement

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