SD Super GoldSearch Coil for HH??

[gadgetmaker]

Hi all,

Have had a HH board for to long and will soon build it up. The question I have is I have a MineLab Super GoldSearch DD? coil from a SD unit. It has two coaxial cables one having 0.8 ohms resistance "transmit?" and one having around 16 ohms "receive?". In order to select the damping resistor for the recieve coil should I just pulse it with the same output and match the damping curves?

Thanks in advance for any help. Karl

[gadgetmaker]

More info

Coil has one winding with 0.6 ohms resistance and 300 uH, the other 16.5 ohms with 450uH.

What do you guys think???

Thanks for any help.

Karl

[Carl-NC]

The 16.5 ohm coil should be the RX. Use a damping resistor that gives a little bit of overshoot on the flyback decay, then decrease until the overshoot just goes away. That should be close to critical damping.

- Carl

[gadgetmaker]

11" ML coil

thanks Carl for the help.

[_Raz_]

The Minelab/Coiltek DD coils I have here do not need any damping resistor on the RX coil, they appear to have an internal damping resistor on the RX.

[gadgetmaker]

Thanks Raz for the input

I will pulse the xmt coil and look at the rcvr coil and see if it rings.

Karl