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The article is here, with the description but nothing about what the inductor Q. I find his numbers depressingly low.? I note on page two he has the LC drive impedance of the 4342A wrong at 50Ω, not

Hi John, Can you describe the inductor used for these measurements? John KN5L

Wes Hayward, in an article "Experiments with Coils and Q-Measurement" tested some capacitors by measuring the resulting Q of an LC resonant circuit using different capacitors. Of the 8 caps tested,

When making and reporting measurements as absolute quantities, it's imperative to report correlation between two, or more, measurement methods. https://www.kn5l.net/Q-Meter/MM-T68-2-30T/ is updated

Im about to use the three gang unit from BC-453, the command receiver, the so-called Q-Fiver. Its 400pF per section, so might be able to use it in a two or three range application. The minimum

How about the variable capacitors from Command Set transmitters? Mike N2MS

Those are some 'pretty' machined air caps, highest I see is 250pf. Mikek

The article seems very thorough, but, compared to this Wes Hayward article,

Interesting Low Loss variable capacitors may be found by searching for:? Ducati air variable capacitors Jacques VE2AZX

See:? MEASURING THE LOSS IN VARIABLE AIR CAPACITORS Many references at the end. https://1drv.ms/f/s!Ahy_QgcypCWEyQ_Sv9O4DUbbzWaT Jacques VE2AZX

Oops sorry .. I replied to the wrong article. [email protected]> wrote:

Also note that some of those low prices are fake : they do indeed provide a suitable welder but you have to add a high capacity lithium battery or supercap set to provide sufficient current to the

Mike,Take several pictures before you do anything to the 260A?It will make it easier to return to original condition.Leon Robinson ?? K5JLR Political Correctness is a Political Disease. Politicians

I have no idea!? On the other hand, they are probably some of the highest Q caps available that don't cost over $100, even though I consider $5 to $7 for one cap ridiculous! :-) I ordered one 100pf

..So what machine are the manufacturers of https://www.mouser.com/datasheet/2/40/700B-2899728.pdf using to measure a Q-value in the region of 10E4 at a frequency of 1MHz? I wonder if this is a

There are articles on some of the 722 series capacitors in the General Radio Experimenter Jan 1936, Feb 1937, & Oct/Nov 1938. Available at IET <https://www.ietlabs.com/genrad/experimenters/1930s/>

I thought it looked too good to be true. Cheers, George G VK2KGG Sent: Friday, 30 September 2022 12:38 PM To: [email protected] Subject: Re: [Test Equipment Design &

I found these are even better, Q=10,000 @1Mhz, 1 pf to 200 pf. https://www.mouser.com/datasheet/2/40/700B-2899728.pdf Mikek

The table is misleadingly labeled! First, there is no way that they could even measure a dissipation factor as low as 1E-13 or so. What they are calling the dielectric loss is actually the product of

You can get some high Q fixed caps from Mouser. Kyocera/AVX Series 100B https://www.mouser.com/datasheet/2/40/100B-2899743.pdf The lowest frequency Q is shown is 150MHz, I don't know if it goes up at