Coil Equinox ,for Minelab Vanquish !?

[EL NINO]

Thanks Skippy, I could never find a Minelab document that stated the frequencies only forum speculations. If you know of a document post the link.

The oscilloscope plot on my Vanquish340,,, really shows that all 3 of its programs are working in salt mode..
The oscilloscope plot of my Vanquish340,,, really shows that all 3 of its programs work in salt mode..
The range for 0.02 grams of gold in the airtest is somewhere around 4.2 cm
The range for 0.1 grams of gold in the airtest is 11 cm..
The results are comparable to the Equinox 800 6" coil .. Beach1 program...0.1 grams of gold 10.5 cm ..
The classic Equinox 800 programs Park and Field, Gold have a better range for these targets in the airtest ... also in the field....

[Altra]

I never had a Vanquish to analyze. But I speculate it only uses three frequencies in all modes. I'm not sure how people know it is in beach mode by looking at the oscilloscope signal? The beach mode on the Equinox only uses three frequencies so I guess the tx signal from the Vanquish look similar to the Equinox beach mode. Also looking at the tx signals and saying it's in this mode or the other is useless. Because the modes are developed in the signal processing.

A while back I reverse engineered the Equinox and Vanquish coil pre-amps and found the Vanquish pre-amp dropped out around 30khz . My speculation is the Vanquish is only three frequencies with the upper frequency being in the 20-30khz range. A simple spectral analysis would answer the question.

Here the pre-amp info post 502
https://www.geotech1.com/forums/foru...e34#post435400

[markantony]

https://youtu.be/T51VfO17IKQ?list=PL...vIN-Y6tNk1myVf

[Altra]

Markantony, I don't understand Russian but it looks like a strong signal at 38khz ? Thanks for posting

[markantony]

Markantony, I don't understand Russian but it looks like a strong signal at 38khz ? Thanks for posting

In the 3rd minute of the clip, the frequencies are listed:
7.89; 18.43; 39.6 khz.

[EL NINO]

Altra...multifrequency plot in FFT on all three programs...in Vanquish 340 they are practically identical to the BEACH Program in Equinox 800... + the sensitivity test itself on 0.02 gram of gold will tell you that Beach type conductivity elimination is turned on..
A simple airtest with a CD will tell you how strong the salt elimination is in the detector... you don't even need an oscilloscope...

[Carl-NC]

The TX coil is 100uH and 0.5Ω. The RX coil drives a preamp inside the coil housing so it cannot be measured without destroying the coil.

[JoyJo]

Is it correct to assume that in coils of different sizes for minelab equinox, the inductance of the transmitting coils will be the same? That is, different Tx coils will have a different number of turns, but the same inductance of the transmitting coil. Is that true?

[EL NINO]

I found my TX scans Vanquish 340 program Jewerly and Equinox 800 program Beach 1...

[Carl-NC]

Is it correct to assume that in coils of different sizes for minelab equinox, the inductance of the transmitting coils will be the same? That is, different Tx coils will have a different number of turns, but the same inductance of the transmitting coil. Is that true?

That's true for any detector model.

[JoyJo]

I've come across the information that the reel of the equinovs is wound with the same litzendrat as the coil. And that there are about 35 turns in the reel. But I haven't seen any inductance measurements of the rx coil. I wonder what causes such a small number of turns in the receiving coil? Besides, why was litsendrat chosen? Winding with litzendrate will increase the parasitic capacity of the px coil, it's not good.

[Skippy]

Quote: " I'm not sure how people know it is in Beach Mode by looking at the oscilloscope signal? "

The Vanquish TX signal is the same waveform as the EQX in 'Beach Mode', therefore its frequency components are the same 4. In the other EQX modes, there is a noticeably different, less complex waveform, with 3 dominant components. The V does not appear to have this.
However - as the operation is determined by software, it's not impossible that different models of Vanquish have changed software, over time. I suspect it's unlikely to have changed.

Quote: " [ fixed inductance - ] That's true for any detector model."

One obvious possible exception, the XP Deus and Deus2, where the designers have the option of varying the TX , ( and the RX coil ), as they see fit. For simplicity, they likely do have the same inductance.

Quote: " why was litsendrat / Litz chosen?"
To transmit at 39 kHz / 40 kHz, without encountering issues like coil-to-coil / coil-size variations affecting performance, you really need the coil to be good to 80+ kHz. Multiple strands of thinner wire is the simplest solution. The EQX TX is not true Litz, it is multiple strands of enamelled wire, but not twisted up in the correct Litz way, for economic reasons, I assume.