On Mon, Oct 10, 2022 at 03:25 PM, Brian Beezley wrote:
1. Use this program to calculate coil inductance and Q. It models skin effect,
proximity effect, and more subtle effects for both solid and Litz wire:
I can open the above page but the Coil.Zip keeps say connection reset while loading.
3. Evidently the styrene pipe couplings popular with crystal set builders use
PVC Type 1. This is not a particularly low-loss dielectric. See the attached
data sheet.
I think that would depend on the crystal set builder. I was active on the now *defunct
'The Radioboard' crystal radio section, stryene was discussed , it is well known
in the crystal radio community that PVC is lossy.
You can tell the difference in the feel, styrene is harder than PVC.
It has more ring to it (like bell), PVC has a damped thud. I doubt you would get a
Q of 1400 with PVC. It is much harder to find a source for Styrene couplers now than it was 5 years ago.
I recently went on a search for a friend and found some, I gave him him the site,
he called and they said they don't carry them anymore. So it may be difficult to find them now.
You can also tell styrene from PVC by a burn test, flame and smell.
4. If you have a Q meter, it's easy to measure capacitor Q. See the Boonton
260A or HP 4342A manual for instructions. These Q meter utilities contain the
instructions and will do the calculations:
I'll look it to that, but, are you actually measuring the capacitor Q, and not the capacitor and inductor Q.
I suspect it's both.
6. Q > 2000 is readily achievable with Litz wire at 1 MHz. The design shown
below uses a 9.9" OD styrofoam cake form.
As I said, a couple people did it on the older Rap n Tap crystal radio forum, using double and triple
660/46 litz wire.
Thanks, Mikek
*Sadly, the fairly new administrator got covid, had real issues and didn't pay the
server fee and we lost years of information. It was very active and productive group.
