Measure inductor Q with this

[@Mr.Smith.C.R]

I love this stuff! I’m 84 now and have been an active builder, operator since 1955… This takes me back to my “roots “. My FT817 is just as well used… LOL! 73, AF6OM

[@StuartM0TTQAmateurRadio]

A very useful tool. I have wound several of those types of tapped coil recycling mains electrical cable for loading coils for low frequency verticals, and you definitely want the highest Q you can get in that application.

[@paulswift700]

That's a very useful bit of information thanks for sharing Peter 😊😊

[@IronandGlassWorks]

Nice test setup. I prefer the ring down method because you can see the results in the scope trace even before you know what the number value is. I'm currently working on a universal coil winder so I can wind high Q coils for use in IF transformers. My thoughts are to use a dual conversion at 1700 kHz and 95 kHz.

[@s57rw]

Nice simple instrument to build and have at hand. Having the analog meter just to find the peak is usefull. Finding it with a digital is quite frustrating since is refreshing the everage measurement just every second or so and the setting of the cap is touchy. After peak found read the exact voltage on the digital one. Having a bigger box you can add a cheap digital meter meter inside not requiring a separate instrument to carry with. In most cases even the cheap meters are accurate enaugh. Probably easier than trying to calibrate the analog to measure on wide range of voltages with required resolution. Have used the same concept on a grid dip meter I've build in the past. Small analog meter to find the dip and cheap counter to read the frequency. This way was no need to bother with making a scale for the tuning knob. Years ago when frequency counters were not easy/small to make or cheap to buy, making a good scale for all the frequency ranges was the main challange. 73 Andrej - s57rw

[@trcwm]

Can't wait!

[@MidlifeRenaissanceMan]

Hey Peter How does the capacitor and frequency you’re measuring with affect the Q measurements??

[@vk3ye]

Measuring the same coil at different frequencies will be another test. I suppose the main value of a unit like this is being able to compare different coils at similar frequencies so you can pick the best.

[@MidlifeRenaissanceMan]

@@vk3ye cheers I picked up some alligator clip to SMA leads for the NanoVNA to do some tests on some coils, caps and filters. Haven’t had a chance to use them yet. Been too busy.

[@Abednego-v2r]

Oh, yes, the ol' Q-anon meter, i remember now... I think that's the one they hooked me up to, with the electrodes, when I went to the Scientology office for a quick visit... I woke up in Mexico a few days later, but that's another story.

[@Trainsaregreat365]

It will be amazing

[@Tony770jr]

Could you use the Nano VNA to measure the Q of the inductor?

[@sebastian19745]

I see many pros and amateurs here on youtube claiming that the inductance and capacity vary with the frequency. I learned to measure inductances and capacity with a huge tube (valve) Q-meter, in late 80s. I also used a GDM, a RLC bridge, tools that I built myself. However, I learned and always knew that the inductance and capacity are a constand depending the constructive dimensions. Am I wrong? If yes, what I am getting wrong? And if no, what others get wrong , maybe misunderstanding the inpedance? Edit: If I remember correctly, Q=wL/R, if you can measure precisely L and R.

[@subramanianr7206]

I really love this project, Parker. Thanks for sharing your presentation. Congratulations. I admire your sincerity and dedication in homebrewing activities. De VU2RZA

[@Ross-z1n]

3dB method

[@paulphoad]

.707..😊

[@subramanianr7206]

I would want you to test and compare the Q of coils wound using ferrites and iron powder cores. De VU2RZA