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Hello Chuck, I think you've misread the chart, at 50 MHz it shows the input resistance to be 55K ohms. Ken g8beq.

Following the 2 pF cap C3 is a 56 pF feedthru cap, C4, to ground, so the capacitive divider is 2 pF/(56 pF + Q1 input C + C1.3 pF, in series with 2.87K). John

I'm just about to build a fixture for measuring Q with a VNA. One tricky bit I see is getting the coupling into the two sides of the coil the same. The paper Jacques Audet references

I wonder how that title was received in 1955.

Thank you Peter. It has certainly extended my knowledge about applications of Q. I have a small collection of low frequency glass encased crystals. I must test a few and see if I can measure the Q

Hi: I've put the WE paper and Ring Down in a new paragraph. Origin of Q & Ring Down And included some calculations on ring down since the paper has the formulas.

I put the HP4342A input circuit together for a better understanding. It has some tiny caps making up a capacitive divider before the FET gate of the impedance converter. The manual is a but

Thanks, you posted it before I got a chance to write to ask for it! ????????????????????????????? Mikek

Yes, I had no problem with the 260A, I was looking at the HP4342A. I did find I only had part of the RF amplifier in the paper I was looking at, it is missing Q1-Q4, the high impedance part plus a

Correction to above sentence: * The premise of the measurement is that the numeric value of the ratio of either the voltage across the inductor or the capacitor at resonance, is the Q. If the voltage

On Thu, Aug 18, 2022 at 10:37 AM, Mikek wrote: > > At one time I had got a socket to fit the 1659 tube base mounted a pcb and > started eliciting help to design a circuit using modern ICs to replace

The VTVM is connected across the variable capacitor and the input of the VTVM is way up there impedance wise, up until around 50 MHz were Boonton designers decided the accuracy was no longer

Hi Pete: THANKS very much for that paper. I've placed the Johnson patent at the top of the patents on my Q-meters web page in honor of his being the father of the term "Q".

At one time I had got a socket to fit the 1659 tube base mounted a pcb and started eliciting help to design a circuit using modern ICs to replace the 1659 tube. I never came up with a working circuit.

Attachment is there on the groups.io web page and on both of my PC email clients (web and Thunderbird) and on my phone email client. Nothing wrong at all from what I can see. Neil G4DBN

Pete what email program are you using, so far two Thunderbird users received it. ?????????????????????????? Mikek

PeteThere is nothing to apologize for. I am grateful for your efforts.I still find myself frequently snared by limitations on websites which to me are not intuitively obvious.One possible solution

I got the attachment, it worked fine for me. ??????????????????????? Mikek

It's not a universal problem - I got your attachement (and enjoyed skimming through it, I've saved it for later.) I'm using Thunderbird running on Windows 10, MK

It was attached in the email feed...