Coil identification?

[39cents]

I picked up this 10" coil for $18 and hope to use it for a project.

A bit of a gamble because I was afraid it would be a chinese coil with circuit board inside and mystery wiring.

Wires are:

RED
BLACK
GREEN
BLUE
SHIELD

With some testing I found:

RED + BLACK = 33 ohms estimated roughly 10mH (using a frequency generator and oscilloscope)
GREEN + BLUE = 24 ohms estimated roughly 4.68mH

Can anyone guess at the manufacturer by it's shape and measurements?

At first I thought it was a fisher coil but the cutouts don't match.

I connected it to a my signal generator with 100ohm on the TX and 1K across the RX and was able to see the phase and amplitude change when various objects were brought near the coil. It did not really respond to small objects though such as a brass key.

Thanks!

[Carl-NC]

Looks like a China coil. What connector does it have?

[39cents]

Looks like a China coil. What connector does it have?

I agree that was my first thought... it looks hard wired. There is a stress relief with a nut and then bare wires.

Looks sort of like the stress relief fitting on a CZ-21 but the coil is clearly not a CZ coil.

I think it is a variant of the chinese MD-3030 coil. it looks similar and the wiring matches.

[kt315]

resonanse frequency on tx side wll give you sure answer. also, you have to learn IS THERE a capacitor inside or not,
'naked' winding. pleasure.

[kt315]

Looks like a China coil. What connector does it have?

i grasp this coil from chinese submersible. there are much names... MD3080, Viper Trident etc...
a clone of FISHER 1266.

[Qiaozhi]

I think it is a variant of the chinese MD-3030 coil. it looks similar and the wiring matches.

As soon as I saw the photo I thought that it looks like an MD-3030 coil. Clearly you thought the same thing.

[39cents]

resonanse frequency on tx side wll give you sure answer. also, you have to learn IS THERE a capacitor inside or not,
'naked' winding. pleasure.

When I pulse the coil with a diode and resistor in series, I see the pulse and then a decaying oscillation of 105kHz

Does this mean there is a capacitor in parallel with the TX coil tuned for 105kHz?

Thanks everyone for your help!

[Carl-NC]

When I pulse the coil with a diode and resistor in series, I see the pulse and then a decaying oscillation of 105kHz

Does this mean there is a capacitor in parallel with the TX coil tuned for 105kHz?

Probably not, it's just the self-capacitance of the windings.

[39cents]

Thank you

[kt315]

When I pulse the coil with a diode and resistor in series, I see the pulse and then a decaying oscillation of 105kHz

Does this mean there is a capacitor in parallel with the TX coil tuned for 105kHz?

Thanks everyone for your help!

do you mean i must order new party of boards of 'LC Coil Generator' as i sold whole primary order? i just reminder it was ESPECCIALY constructed to cover off all problems with coils.
i can not answer if people do NOT wish to use it in their everyday practice&experiment, because i HAD made ALL I CAN do (for them).
pleasure.

[Matt_Rowe]

Looks like a coil from a Bounty Hunter that i once had.

[kt315]

Looks like a coil from a Bounty Hunter that i once had.

BH with waterproof fitting?

[Matt_Rowe]

sure, this from BH website (8" interchangeable waterproof coil )

[39cents]

I don't see a bounty hunter 10" coil which looks like this one.

It didn't have a DIN connector on the end, just a waterproof compression fitting and bare wires, but who knows what life it had before I found it.

It really doesn't matter though I've figured out the wiring and measured inductance of each coil.

My earlier question about the frequency though: I realized this is probably due to self capacitance of the coil plus the additional capacitance of my test lead.

[kt315]

sure, this from BH website (8" interchangeable waterproof coil )

look on outfeet. there is NOT the socket on end. this is sealed cable end in an enclosure.
chinese MD-3080 VIPER TRIDENT.

pleasure
Anatloy Dirtymad