ZVT Metal Detector

[James]

I am looking for opinions on the best ZVT type metal detal being manufactured at time, Best Holiday wishes JW

[Carl-NC]

Are you talking about square-wave pulse?

[kt315]

winter melancholy time.
https://www.geotech1.com/forums/show...nelab-GPZ-7000
https://www.geotech1.com/forums/show...smission-(ZVT)

[James]

I have been reading a book about metal detecting, an the author mention that a "ZVT" type detector is the best for most metal detecting, There was no mention of the type of wave form transmitted by the device. The author stated that the device transmitted 28 to 32 different frequencies. I was curious does this type of detector really do that much better than the current detectors on the market. Thank you for letting me post on the board, Happy Holidays to all. Jim

[Carl-NC]

With all due respect to the author, he's writing well beyond his knowledge on the subject. ZVT is what Minelab calls Zero Voltage Technology and is basically square-wave pulse induction. The only detector it applies to is the GPZ7000. "Zero voltage" is a poor descriptor technically, as it actually requires a very high voltage for the turn-on slew, and is followed by a low "hold" voltage for the rest of the transmit, but at no time is it ever "zero." Minelab also suggests it's a VLF technique but it's really a form of PI. It is not a multi-frequency design so saying it has 28 or 32 frequencies is completely meaningless.

Anyway, if you want to find the largest and deepest gold nuggets, it is probably the best on the market. If you want to hunt salt beaches, or coinshoot parks and lawns, or hunt trashy sites, or cherry pick high conductors, it is probably an exceptionally poor choice. It is also ergonomically one of the worst designs on the market, so if you swing it all day you might have to follow up with physical therapy.

There are some good multi-mode detectors on the market that do several things pretty well. Often they are not the absolute best in any one specialty so you have to consider what kind of hunting you want to do and go from there.

[James]

Thank you Carl.for the great update on what "ZVT" detector. I will finish reading this book, I might have more questions for the board, an always have fun here on the board. Thank you again, an no I don't want or need physical therapy from metal detecting. Happy Holidays to all an thank you for the use of this board. Jim

[bklein]

You gotta tell us the name of the book. There aren’t many to choose from out there and the ones I know about don’t mention ZVT detectors.

[deemon]

With all due respect to the author, he's writing well beyond his knowledge on the subject. ZVT is what Minelab calls Zero Voltage Technology and is basically square-wave pulse induction. The only detector it applies to is the GPZ7000. "Zero voltage" is a poor descriptor technically, as it actually requires a very high voltage for the turn-on slew, and is followed by a low "hold" voltage for the rest of the transmit, but at no time is it ever "zero."

Of course , Carl , they'd better name it "Zero Reactive Voltage" , it might be more precise If we can buy an ideal coil , made of superconductor - we should simply short it to obtain a constant current in the coil , lasting for a long time , and this would be really a zero voltage ... but in real coil we need to apply some voltage to the coil terminals to push the electrons through the copper , to overcome its resistance and hold the current constant - and this is a situation that must be called "zero reactive voltage" with non-zero active component .

[kt315]

all doing ML is the preamp in coil. that gives the grow of depth on 1-2 inch. just that. all another are just mind control manipulation tricks, bare naked adwertizings, misleading
of people.
i say again x-Terra 'true digital V-FLEX tech' is in reality ANALOG signal transmit from a coil and NOTHING OF DIGITAL.
these tricks in their opinion would be blocked all attempts to copy ML coils, but NEL HAD COPIED THE CODE AND DOING TWO-FREQUENCIES COILS
setted TWO MICROS at coil pcb. ML must cry!

[kt315]

ML NEVER SAY YOU JIM ABOUT THE (THE) PREAMP in THE (THE) COIL -! he does just fantazy to invent new slogan on every his new detector and that is just for misleading of YOU -! we recall that as the capitalistic way of lies and deceit.

[Carl-NC]

I worked on a square wave PI system at White's, the concept has some performance advantages. It's certainly not just putting the preamp in the coil.

The X-Terra has normal analog TX & RX waveforms, I don't recall that Minelab ever said differently. The digital "VFLEX" part strictly pertains to a digital ID chip in the coil that tells the detector what frequency to run.

[kt315]

ML shared a free code, schematics, BOM files, kits with us? i reminder that QUASAR is free code and working with any frequency type coils.
also KROT and FORTUNA. you can choice a frequency&balance via menu on-the-run and not there needed to connect a coil with the micro inside.
all schematics are free, no secrets.

https://fandy.ucoz.org/QuasarARM/Quasar_ARM_SCH.pdf

https://www.youtube.com/watch?v=C6QcOf5rMU4

hunting on a field with a metal detector in 2016 quasar arm

[deemon]

I worked on a square wave PI system at White's, the concept has some performance advantages. It's certainly not just putting the preamp in the coil.

It's interesting , Carl , did you finish the project ?

[Skippy]

Here's ML's 'technical information' on their GPZ-7000 using 'ZVT' ( pdf file ):
https://www.minelab.com/__files/f/25...on%20(ZVT).pdf

Bear in mind that ML are prone to 'sales spiel' , obfuscation of the truth, and they don't want to give away too much details on techniques that are proprietry / patented .... so don't take everything at face value.

[Orbit]

Long before the minelab appeared gpz7000 with a friend we tried what they call zvt the patent is quite clear only i don't know how he would handle big coils , they may have complicated it that many would not understand how it works and it's actually pretty simple I'm doing something similar right now with soil balancing with my magnetometers ..