Found an 88 mH toroid

 

I finally found an 88 mH toroid, this one has red/green windings which are not twisted tightly together like they are with RF bifilar or trifilar transformers.  I also have 88 mH toroids which have two green windings separated by cardboard spacers but I haven't found them yet.

This toroid can be compared to the washing machine solenoid coil mentioned here:

https://wb9kzy.blogspot.com/2022/10/i-found-this-solenoid-coil-in-junkbox.html

The toroid measures 112 mH with both windings in series using the Morse LC meter.  The coil resistance is 7.7 ohms so as mentioned before presumably a much higher Q than the washing machine solenoid.

Obviously 112 mH is much larger than 88 mH that would be expected, this page gives a possible partial explanation in the 4th paragraph:

http://techlib.com/electronics/largeind.htm

The other reason could be the inductance measuring of the LC meter being off.

Anyway I don't think that this toroid is going to be useful as far as LF antenna tuning.

The next thing: find the WWVB ferrite bar antennas that I have around here somewhere.

Best Regards,
Chuck, WB9KZY
http://wb9kzy.com/ham.htm