Magnetic Wave Propagation

[B^C]

Gday Guys,

I was playing around today with that basic circuit i mentioned before & managed to get the flyback under control without a damping resistor near the circuit.
I'll attach a picture of the coil signal, same settings as the previous picture.

[Wirechief]

Gday Guys,

wyndham,

Wacky idea's, I'm with Simon on that one & i think i was born from one hahaha.
Infact i believe your idea is not so wacky & in reality there may just be such a signal as you mention, there would seem to be a reflected pulse for want of better words. But trying to distingush this as Simon mentioned also is very hard indeed. I have been looking at this & is the reason for the thread about wave propagation, all sorts of strange things can be observed when looking closely at target response.
If for instance if we could cancel all noise completely we could pick this signal out but it blends in to a lot of ground, circuit noise etc.
It can be observed in Air testing target response that's for sure but is muffled once the target is underground.
Other peoples opinions on this would be good also, good or bad & keep the wacky idea's coming!

Wirechief,

I use the 16" Advantage Mono coil from Nugget Finder (Picture Attached)which is an excellent coil but can get noisy in really bad ground even with the 4500.
For bad ground i use the Std 11" DD coil which is very under rated due to people wanting better Coils, the thing is it's a fantastic coil given the chance, most people use that much of a ground balance that it deadens this coil, you have to keep it energised & on the edge.
The Eliptical coils from Minelab are also very very good & only just last weekend i gave one a run & was surprised at it's performance--great coils & i am going to buy one very soon.

I believe if the detector circuit can not create a good magnetic "push" at the Coil then more than likely the field is going to just hum around the coil so to speak & be there as stagnet as an old pair of Underware.

If on the other hand the circuit can create a good magnetic push at the coil then of course it's going to punch deeper, i can show this with some tests.
I have been just playing around just tonight with a very basic circuit for test purposes only to demonstrate this among other things. To be honest i'm to paranoid to attach screenshots of the main circuit i am building as it is quite revealing & shows a new approach to this detecting business.
I'll attach a screenshot of the first run of the basic circuit & the coil Voltage, it needs a few tweeks but it's not so bad actually for the first test & depending on what you want. I need this for a specific reason.

Hi B^C, thank you for the pic of the NF Advantage coil. Actually I am a field rep for Chris Gholson for the NF coils. I have not been able to sell any because I figure I'm not in gold country. But I just picked up a gold claim in New Mexico and hoping to make better contacts for the gold nugget hunting crowd. Ok on the GPX4500, in fact I finally got to hold one today for the first time. I was amazed at how light it was. I thought it would be much heavier for some reason.
Thanks for the shots of the scope traces of the pulse from your circuit. I was wondering what the small spike on the lower right side of the big pulse was caused by. No if your not comfortable in showing your circuits to us then I wouldn't do that. Ok thanks for the pics and I hope your work progresses well for you. Good hunting and be safe.

John Tomlinson,CET
John's Detectors

[B^C]

Gday Wirechief,

The spike you mention is actually a Scratch on the O-Scope screen, one day my dog thought it was a good idea to jump up & give me a hand & scratched the plastic screen--bloody thing!

Hope you have some good luck Prospecting, it just takes lots of persistance.