Menu
What's new
Find's Treasure Forums

Welcome to Find's Treasure Forums, Guests!

You are viewing this forums as a guest which limits you to read only status.

Only registered members may post stories, questions, classifieds, reply to other posts, contact other members using built in messaging and use many other features found on these forums.

Why not register and join us today? It's free! (We don't share your email addresses with anyone.) We keep email addresses of our users to protect them and others from bad people posting things they shouldn't.

Click here to register!

Need Support Help?

Cannot log in?, click here to have new password emailed to you

Shiny coins

A

Anonymous

Guest
Can anyone shed any light on this area:
Why do some new, shiny cupro-nickel coins, in this case the small Australian 5 cent coin, produce a double-blip response from my Goldquest SS ??
The only time they respond this way is when they are in a "fresh from the mint" condition. Lying flat also generates this double blip response. Surely it has to do with the perfect mirror-like finish to the coin, and nothing else. <img src="/metal/html/confused.gif" border=0 width=15 height=22 alt=":?"> <img src="/metal/html/confused.gif" border=0 width=15 height=22 alt=":?"> All other 5 cent coins that have even minimal wear, respond like typical coins do.
Tony.
 
Hi Tony,
Quite simple really. When the shiny new coin is on the coil axis, the reflected signal blinds the detector. As soon as it gets a bit dull or worn, then you get a normal response. Bit like looking into a mirror with the sun directly behind you.
Eric.
 
Hi Tony,
Probably not that simple. That was just a spoof reply <img src="/metal/html/biggrin.gif" border=0 width=15 height=15 alt=":D"> Have you checked the new coins with a magnet? Over here, our later copper coins are not what they seem, just copper plated steel. Maybe as part of the Australian currency devaluation, yours are nickel plated steel. If the coin is true cupro-nickel, then I am not sure, except to say that below a certain diameter, the 11in coil will be too big for the target and you will get a hole in the middle of the response. Can't imagine that is the situation though. Send me a coin - I'm curious.
Eric.
 
I've gone and tested them again.....do you think I can get a double-blip now ??
They are now behaving like normal coins but certainly weren't in the ground <img src="/metal/html/confused.gif" border=0 width=15 height=22 alt=":?"> <img src="/metal/html/confused.gif" border=0 width=15 height=22 alt=":?">
There is no iron/steel composition as the strong magnet had no pull on them. I'll put it down to a BGA (Below Ground Anomaly).... <img src="/metal/html/grin.gif" border=0 width=15 height=15 alt=":grin"> <img src="/metal/html/grin.gif" border=0 width=15 height=15 alt=":grin"> .
Tony.
PS Did you get my e-mail about your Sandpiper PI probe ??
 
You must log in or register to reply here.
Top