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Hi Mikek, An ALC is not necessary if the high to low impedance converter has fixed gain through applied load impedances. Bottom of: https://www.kn5l.net/Q-Meter/ is schematic: "Q-Meter Prototype

We have seen that the HP4342A Impedance converter transformer driver is a simple two transistor circuit with low output impedance. Does anyone have an automatic Level Control circuit (ALC), we could

Please repost with a sensible title. I am locking the topic Dave, group owner

You might get more of a response with a better topic than "any interest?" Steve

New Q measurements in: https://www.kn5l.net/Q-Meter/MM-T80-2-80T/ Wanted to measure an Iron Powder Toroid with Q-Curve within nominal Q-Meter, 400pF to 500pF, maximum resonating capacitor value.

Sure, I can do the 3db method. The idea is to compare to the known good cap in the 260A. I can also do the 3db method on my 260A to get a Q number to compare to the other caps, but that not a direct

Have any way to measure q other than the 260? Perhaps: Make a similar inductor with a tap at 1 or 2 turns to serve as a measurement point to prevent loading when measured with a HP 3400. Use the 260

OK, good, got that. Now, does the actual loss resistance of an air capacitor change from minimum capacitance to maximum. Would the actual RL of the 260A capacitor be more or less at 37pf vs 100pf.

That's a different case than I was discussing -- I was talking specifically about a situation where a loss resistance (and a loss resistance alone) is placed in parallel with a lossy capacitance

If I have two capacitors with an ESR of 1Ω and I put those two capacitors in parallel, wouldn't the ESR go down , thus losses go down? I know I'm missing something, I just don't now what. Mikek

Parallelling two resistors certainly makes the /resistance /go down, but that means that the /loss /goes /up /(Q goes down). Q is a measure of how much energy is stored, per energy dissipated. Think

several air caps I have to the air cap in the 260A.<< I decided to experiment with my personal air caps compared to the Boonton 260A air cap. I looked into disconnecting the air caps in the 260A, it's

Very nicely done, Brooke! Thanks for putting in so much effort to collect and present all of that terrific information. -- Cheers, Tom -- Prof. Thomas H. Lee Allen Ctr., Rm. 205 350 Jane Stanford Way

Hi Mikek: Here's a table where each column has the same Litz bundle size. https://prc68.com/I/Inductors.shtml#Q -- Have Fun, Brooke Clarke https://www.PRC68.com axioms: 1. The extent to which you can

Litz individual wire size is specific to frequency. The UPS is probably operating at under 100kHz. Here's a page that shows a wire size to frequency chart.

I have ordered one Ducati capacitor.Will check its Q using the delta Q method with my 4342 Q meter.See my website ve2azx.net?The Ducati capacitor will be used to build a very simple Q meter using a

In an effort to produce a wideband transformer 1.5MHz to 150MHz, I propose a multicore transformer. As I see it part of the problem is to avoid resonance of the primary caused by the self capacitance.

I recall seeing some very heavy litz inductors recovered from a scrap UPS. I don't have any expertise in this sort of thing, but it's somewhere I'd look for examples.

Those weren't my tests and results, but an article by Wes Haywood, "Experiments with Coils and Q-Measurement". <https://hrsasa.asn.au/downloads/files/coilq.pdf> "To begin an evaluation, I took the

Hi Mikek, In post #799 /g/Test-Equipment-Design-Construction/message/799 I evaluated EMRFD measurement scheme using 2-Port VNA. worked perfect. I was not able to replace measured Q