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I had guessed the DC block above SRF might be useful even when C was not the LF value. Thanks for the insight on R and L, Alan. Brian

Well.....here's another one for you: SM inductors. Most of the suppliers quote Q at 1 MHz. 1) The RF "resistance" (due to skin effect) should be used instead of the DC resistance. 2) Outside of

This is common practice in microwave power amplifiers and and some MMIC designs as one component brings in two. The R and L for above SRF of the C serves as a DC block while adding a stabilizing R

That's what I finally guessed designers must do. Check out the Y21 method plot for capacitance I just posted for a different capacitor. Above the first two resonances, capacitance returns to a

After looking at more .s2p capacitor files, I've concluded that the file comments refer to the measurement frequency range, not the recommended frequency range for the part. I've attached

To elaborate on this a bit. Let’s think about a standard 0602 sized part - that’s 0.06” long or about 1.5 mm. A piece of wire that long has an inductance of about 1.5 nH. With, say, 33 pF,

Grand! Thank you.

The max frequency is probably more about where losses get too big. And they’ll measure for a very wide range. Most design tools can deal with staying away from the SRF, if supplied with the part

Yes, it is Zack W9SZ [email protected]> wrote:

By coincidence, I just added an image showing capacitance and dissipation factor plotted by my S-parameter plotter. It was derived from an .s2p file provided by Kyocera. Scroll to the last

Is the measurement frequency stable? Dave ZL3FJ

I have consistently had this problem measuring inductors, capacitors and resistors. Just recently I measured a silver mica capacitor that was around 3400 pF. I measured at 475 kHz (630 meter amateur

I live in a quiet neighbourhood; the antenna measures 8 cm from tip to tip. I shall take some measurements at the countryside and report back when I do.

Too bad it doesn't lead to any practical use. What do you expect me to do with a deadly formula like this? -- F1AMM Fran?ois

I was thinking that such fluctuations seen in NanoVNA were due to swinging of my multi-band fan dipole in the wind! That would change the relative nearness of elements to each other and nearby

Or to put it simply, the VNA contains a highly specialized radio receiver. "W0LEV via groups.io" <davearea51a@...> wrote: -- 73 -Jim NU0C

Nothing.. just some places block accesses to various countries, so finding alternate ways to get there is useful. There was a time when .int was resolved through a DNS server in China, which is

If you have a close-by strong source of RF energy like FM or AM broadcasters, police, ambulance, CB'ers, hams, ....... any of those and more could be affecting the readings. This is not all that

Is it normal for the readings to fluctuate as much as 2-3 ohms ? As in 11+/-1.5 - j(70+/-1.5) Dipole NMHA (antenna), balun, calibrated, two ferrites: one at the balun and one at the VNA S11 port. No