Coil for HH DETECTORPRO PULSE

[ansi]

Good evening,
you can build a coil for HH detectorpro pulse?

[ansi]

There is someone who has built a coil for HH pulse?

[WM6]

Do you have this detector?

[ansi]

Yes, I have the detectorpro HH PI with 8" coil, would build me the coil 11".

[WM6]

If you measure data of your 8" coil (Inductance and Resistance of coil windings) then we can discus further possibilities.

[Carl-NC]

The Headhunter PI uses a std mono coil which is fairly easy to build. Mostly match the inductance of the stock coil.

[ansi]

Ok, as soon as I can I measure the resistance and inductance of the current coil 8",
then I try to make a larger one with the same electrical characteristics.

Thanks

[WM6]

Good decision ansi. Please post your measurement here too.

Hope coil connector is not something special and hard to achieve? Anyway there is always solution.

[ansi]

I measured whith LCR Meter the original coil 8 " to 1KHz:

L=1.063 mH
R=8.88 Ohm
0.75 Q

I tried to calculate theoretically , but I can not find a configuration between L=1063 mH with R=8.88 Ohm . It may be that in the coil there is some passive component?

Thanks

[maikl]

Maybe you are wrong...maybe a L=1063 uH and not L=1063 mH...

[ansi]

I confirm, the instrument shows me:
L = 1 mH
R = 9 Ohm
I tried again several times, but always the same result....

[maikl]

It is possible that the connector cable or the coil that is damping resistor...
Can you photographing PCB in a better resolution to see...?

[ansi]

points with commas

Dear Maikl,
the photo of the PCB I have not made because the instrument is under warranty and I would not open it.

I also measured the three original contacts A - B - C:
A - B = 8,63 Ohm - 1,06 mH - 0,77 Q
A - C = 0,021 Ohm - uH 0,22 - 0,06 Q
B - C = 8,63 Ohm - 1,06 mH - 0,77 Q

I built a prototype coil 12 "with 40 turns of 28 AWG wire:
8,26 Ohm - 1,18 mH
Risk of breaking the MD with these differences?

thanks a lot,
Angelo

[maikl]

Coil of HH DETECTORPRO PULSE can work on Delta Pulse, see link "Reply #13" http://www.thunting.com/smf/pi_desig...6771#msg236771
What does it mean to be and vice versa...
Best regards.

[Reg]

The HH should work fine with the coil you made. Since the HH is a low powered PI, there is a limiting resistor that limits the current into the coil, thus most any coil around 1mh should work without hurting anything. In fact, I suspect you could use coils down to 300 uh without any problems also.

Reg