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

Changed email? Forgot to update your account with new email address? Need assistance with something else?, click here to go to Find's Support Form and fill out the form.

X-Terra user's read this

Come to think of it, Youre absolutely correct about the radio bands and single vs muliti.

Wonder if minelab drops the FBS on future top of the line detectors or will keep it until they are satisfied with PI disc, wich I am sure they have in the works and with progress too.

Seems like 2007 will give us the first few to evaluate, Minelab is probaly not long after the ones i have heard of.

Regards.

Bjorn
 
Hi Bjorn,

I think ML will keep the Multi-Freqs as they do very well in saltwater, deep silver etc. I was thinking more along the the lines of what Steve H. mentioned with the Eureka Gold with three selectable frequencies and a single coil.

I have measured and know the Fisher CZ's have a fundamental @5KHz & harmonic @15KHz as seen below on a spectrum analyzer.

[attachment 55902 cz20wvF.jpg]

So two frequencies are possible and perform reasonably well as CZ's have demonstrated for years, but three seems to really be pushing it for maximum performance with selectable schemes. I know the Red Heat's will shift depending on attached coil, but I believe it is only between 14KHz & 19KHz. On the DFX there seems to be varying opinions pro & con on how well the frequency switching scheme works performance wise.

Maybe the Eureka was the progenitor of the X-Terra's, possibly an updated/modernized version.:shrug:

HH
BarnacleBill
 
Interesting stuff Bill.

You are very informed, Impressive. I have been struggeling to find out why my explorer constantly finds deeper (true silver and copper ) objects but seems to lack in the foil area.

You probably know that different freqs needs different voltage to work optimal. Higher the freq, higher the voltge needed to penetrate.

My view is that in a multifreq detector you will see differenet performance if the power isnt big enough to support the highest freqs potential.

That is if it is not chip controlled. And then you will have much unused power on the lower freqs, that i dont think they opt for.

They wanted it all and therefore the lower works better.

Still only my opinion but the physics are fact.

added on edit:,, Your cheme shows that on the cz too. My experience shows it in my finds.

Bjorn
 
G'day there BarnacleBill: What can I say, except for thanks for the rundown on the relationship between "Q", frequency, ID stability, and coil dimensions in the X70. You make on hell of a lotta sense and explain the coil/chip thing quite succinctly. Like I said at the outset; I think I was being cynical about the chip in coil scenario in terms of thwarting aftermarket coil builders, but serves me right!.

I noticed though, that the X70 performs just as well for a cynic as it does for a optimist!. Kindest regards: John
 
Top