Monte can you recollect...

[PennyFinder]

If a 11" or 12 " Hothead coil was made for the Compass Scanner AU-52/AU-2000 series detectors?
Apparently Compass as well as Wilson made them for Kellyco before Kellyco bought the rights from Wilson.

http://n2.nabble.com/Hot-Head-Coil-for-Compass-scanners-td2546655.html#a2546754

http://n2.nabble.com/Compass-Hothead-coils-td2090745.html#a2090745


PennyFinder

 

[Monte]

who produced my favorite, the 5.5 Ferret HotHead coil I especially liked on the Classic SL series.

I do not recall them making any HotHead coils for the Compass AU series. You could contact KellyCo and ask them, perhaps they have an old HH coils or two hanging around?

Monte

 

[PennyFinder]

Seems they made a Hot Head coil for the Scanner series which ran at 13.77khz. The Au-2000 also ran at 13.77.
The Au coil worked for both the AU-52 and the Au-2000, which was 52khz initially on the Au-52. The harmonics for the coil is roughly 4:1.
4 x 13.77khz is 55.08khz, close enough.
52khz divided by 13.77= 3.776. This works for antennas . The radio techs us 1/8 lamda,1/4 lamda,1/2 lamda antenna lenghths for the same frequencies all the time and can be used on multiples of that frequencies.
Metal detector coils are essentially a transmit and a receive antenna ( 2 antennas).
As long as the impedance matches is the same, my thesis should work right?

PennyFinder