Coil Questions

[mbiondo]

Hello all,

I have a Teknetics T2 detector, and have been trying to figure out the coil. It is advertised as being a Double D coil. This is what I know:

The 5-pin connector that rings out like so: (no pins connected to the connector body)

Pin1 to Pin2 reads 36.7ohms. Pin2 is a shield for the wire going to Pin1.

Pin3 to Pin5 is 1.4ohms
Pin4 to Pin5 is 1.4ohms
Pin3 to Pin4 reads 2.5ohms
Pin5 is a shield for the two wires going to Pin3 & Pin4

Pin1 to Pin2 is 6.8uh
Pin3 to Pin5 is 186uh
Pin4 to Pin5 is 186uh

Putting the scope on the coil wires:

Pin1; scope grd to Pin2: Can't tell much...looks like low amplitude noise, unable to sync.

Pin3; scope grd to Pin5: 13 kilohertz
Pin4; scope grd to Pin5: 13 kilohertz, 180 degrees out of phase with Pin3

When passing any metal under the coil, the detector responds, but I see no change on the ocsilliscope.

From the above, it appears there is 3 coils??? Am I mistaken that a DD coil just has 2 coils? I have read that concentric coils will often have 3 coils - a TX, RX, and bucking coil, but I'm not sure what is going on here if this is indeed a DD coil.

Thanks...

Michael-

[Geosearch]

Michael, did you sort that one out?

[mbiondo]

No Geosearch, never could find anyone that had any info on the coil. If you can offer any insights, it would be most appreciated.

Thanks...

Michael-