Coil depths.

[JBM]

Hi Folks,

Can someone please give me a general % loss of depth when using the 18kHz coil compared with is brother 7.5 kHz one.
Thanks,Jerry.

 

[Bill W.]

Jerry,

I would imagine that is dependant on what you are hunting. With the 18khz coil you'll probably lose depth on silver and copper but gain sensitivity on deeper gold and nickel type targets.

-Bill

 

[JBM]

Thanks Bill thats the sort of info Iam looking for.

It means that I can avoid wasting time by using your experience.Jerry.

 

[JBM]

Hi Bill this will interest you .

I took stock of your advise about the 18 kHz coil with regards silver.

I had a pleasant surprize when this .925 silver Half Groat(Elizabeth 1584-86)surfaced from about 10" while out today.

It measures just over 1/2" in diameter but is very thin being a hammerd coin.

I was using all metals and it read out at 15.

Iam going to give the 7.5 kHz coil a rest for a little while.

Best wishes,

Jerry.Bristol.UK.

 

[Dunkindiver]

Nice one Jerry, I'm going to post my three Roman grots I dug today with the X-terrier.

 

[Bill W.]

Looks like you did good. What did the coin read out of the hole? Being deep and thin the 18khz probably helped even though it's silver. Detecting is strange at times. Congrats on the coin!

-Bill

 

[JBM]

Hi Bill I did not put that very well.

The reading of 15 was with the coin out of the hole an placed on the ground.

In the ground the sound was high pitched and the numbers fluctuated mostly in the high range between 30 to 45.

Regards,

Jerry.