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Alan, Using a cavity would be roughly equivalent to my idea of using a crystal in series with the capacitor to be tested. With the crystal being suitable at HF and low VHF, and the cavity at high VHF

Everything is possible. But I do think that the main cause of the Q inaccuracy is the limits of the NanoVNA. It's just very hard to measure a very small resistance when it's in series with a very much

On 3/21/21 1:18 PM, jmr via groups.io wrote: > I think it's a bit optimistic to hope that a VNA could measure that component with a basic s11 measurement. I did a few quick sums and at 100kHz, a 485pF

I can't really see any difference on my device when leaving this set to auto or when setting it to 8mA as you describe. /Andreas - SA0ZAP

Well not quite, John. DiSlord has released v1.0.50 now.? :-) Mike - M0MLM ------------------------------------------------------------------------ *From:* John [mailto:k9ka@...] *Sent:* Monday,

Hi Group, I finally got my H4 VNA running with Dislord's V1.0.45. My solution was to first load Huygen's V1.0.45, which worked, and then follow up by loading the Dislord V1.0.45 which is now working

After reset calibration, select 8mA output (CALIBRATE->POWER->8mA) and after made calibration (this mode used in 0.8). This also reduce noise on measure. 1.0.50 version fix some bugs after 1.0.45

This is how it looks on my device now using the 1.0.50 firmware (performing same calibration procedure as described above). I think it looks better, but the 0.8.0 firmware still seems to perform the

On Sun, Mar 21, 2021 at 05:56 PM, jmr wrote: > > I tried to repeat Roger's test of a 'Hi Q' 470pF cap with my nanoVNA and > managed to see an indicated Q that was very noisy (as expected) below 10MHz.

I think the usual way to measure component Q with an S21 measurement is to place the cap in series with an inductor and then put this in shunt as an acceptor circuit to ground. Then measure the notch

If you don't ask, you won't find out they say. So here goes, could capacitor Q be measured using the S21 method? Richard, K8CYK [email protected]> wrote:

I tried to repeat Roger's test of a 'Hi Q' 470pF cap with my nanoVNA and managed to see an indicated Q that was very noisy (as expected) below 10MHz. At 10MHz it was probably averaging a indicated Q

Thanks for the update. I appreciate the effort. Looking at the notes you have a fix in the H4 version "-For H4 now allow 7 save slots H - fix tupo on average (now noise floor more better)" Do you

If the transmission line leading to the load and the load are good 50Ohms the length of the line is irrelevant.

It would be interesting to see what type of 470pF cap Roger was testing. The plot shows a Q that collapses to 200 by 1.3MHz. I'd expect the nanoVNA to be able to indicate a much higher Q than 200 at

Hello Carl, I have also some documentation around the RF Demo Kit board: /g/nanovna-users/wiki/16592 73, Rudi DL5FA

Look for the Boonton 34A resonant line coupler. A reasonable approach of course is build your own. A target unloaded Q that would be of value is 500 to a 1000 at some target freq... say 400 MHz. Fun!

Quite some time ago I was qualifying ceramic caps for high power PA designs. The vna measurement just can't quite make it. The approach that did work and correlated well with practice in design was to

I think it's a bit optimistic to hope that a VNA could measure that component with a basic s11 measurement. I did a few quick sums and at 100kHz, a 485pF capacitor with ESR 0.58R, -3282R reactance, (Q

In another topic the limitations of the NanoVNA when measuring the Q of inductors and capacitors was discussed by Manfred Mornhinweg. /g/nanovna-users/message/21404 This has been my