Deus II: About the oscillogram

[Skippy]

El Nino: "Also the number of detected and dug up iron as a good signal...which I didn't dig up before with other detectors"
Yes, they do give false indications on sheet iron, and items with 'loops', like chain links, washers, buckles. I see a number of the iron items you showed in the WA0001 photo have loops in them. Even at 18kHz, these types of iron are troublesome.

[Davor]

Yes, it is most definitely 1:3 simultaneous dual frequency Tx when that option is turned on.

It can be arranged so that each end of a coil is supplied with a bridge, one giving square signal at lower frequency, and the other at 3x f. Interesting feature is a delay between the two, which only influences the 3f peak. I didn't go too much into details, but I guess it influences its phase.

All in all, an interesting concept, and simple to build. Original Deus had resonant Tx, so this is something different, and IMHO better.

[F117]

I measured the magnetic field of all 12 factory programs of my Deus2 using a small pickup coil placed in the TX coil.
The TX coil is the left half when looking down on it.
A lot of noise from a nearby wifi access point and the backlight of my oscilloscope was also picked up for free.





P1: GENERAL FMF • Max. freq.40khz


P2a: SENSITIVE FMF • Max. freq.40khz




P3: - SENSI FT FMF • Max. freq.40khz



P4: - FAST FMF • Max. freq. 40khz



P5: PARK FMF • Max. freq. 24khz



P6: DEEP HC FMF • Max. freq.14khz




P7: DEUS MONO MONOFREQUENCY adjustable from 4 to 45kHz




P8: GOLD FIELD FMF • Max. freq. 40khz



P9: RELIC FMF • Max. freq. 24khz






Limit of 10 attachments reached






Seeing this, 2 questions pop up with me:

1/ A lot of these magnetic field signatures are identical.
So, the difference needs to be found in the signal processing / software handling ?

2/ Nothing to do with the Deus, but general for all IB detectors:
The TX coil is at the left side here, looking down on it.
So when you swing it from right to left , the TX coil is over the target first and next the RX coil.
When swinging from left to right: the RX coil is over the target first and then the TX coil.
For a DD setup anyway.
Does this make a difference ?

[F117]

P10: DIVING FMF • Max. freq. 14khz





P11: BEACH FMF • Max. freq. 24khz






P12: BEACH SENS FMF • Max. freq. 40khz

[pito]

1/ A lot of these magnetic field signatures are identical.
So, the difference needs to be found in the signal processing / software handling ?

What is needed is a flat Tx frequency bandwidth. Distortions are removed by filters. The difference is in the received signal.

[ivconic]

Page 7, post #97.
First try, on Arduino, not bad right?
I guessed pretty well...

[Magnum]

How familiar it is. This is an oscillogram of my MAGNUM metal detector's signal. Pruduced since 2010.

[Magnum]

I wrote an article how this works in detail. It was printed in "Rádiótechnika Évkönyve 2015".

[Mark-VA]

After watching all these videos and pictures, I'm still confused. The video was great but I only saw 1 transmit frequency being displayed. I recorded each program frequency (bottom right had side of the scope)
Only one of three different:
40.4040 Hz
24.2420 Hz
9.5240 Hz
Depending on which program was selected.
Clarification would be fantastic.
Thanks

[Carl-NC]

Which video, and at what time marks?

[Mark-VA]

https://www.youtube.com/watch?v=E2AYJp2uH2U

1.06
2.57
4.38
5.13
6
6.58
10
11.18
12.17
13.11
14.18
15.40

I will add since I had been having so many detection issues with the Equinox 800 (not being able to detect targets the f75 could) in the horrible ground I decided it was time to sell and trade up to the Deus 2. I like to know all I can about the detector even though I can see now the Manticore will or rather might do better at these locations.

Thanks for interpretations.

[Skippy]

I have to say I'm surprised Mark finds the Eqx struggles in his coke-ridden ground. I found that situation was one of those aspects that most impressed me about the Eqx. I've detected a couple of sites that were used by the military as camps during WW1 and WW2. Campfire residues, full of coke, are commonplace. The Eqx easily picked out coins/buttons etc among huge chunks of that garbage, even with decent ID values. My pinpoint probe was useless, sounding off on every lump of the stuff, only by extracting everything and getting the detector to hit on it did I find the targets. My F75 wouldn't have stood a chance, realistically.

[Carl-NC]

Except for 6:58, 12:17, and 15:40, all of those are multifrequency waveforms. 6:58 and 12:17 show a 4.75kHz single-f waveform, and 15:40 shows a 45kHz single-f waveform.
1:06 shows a 7.8kHz + 39kHz MF waveform. Others are the same or similar.

[Mark-VA]

I have to say I'm surprised Mark finds the Eqx struggles in his coke-ridden ground. I found that situation was one of those aspects that most impressed me about the Eqx. I've detected a couple of sites that were used by the military as camps during WW1 and WW2. Campfire residues, full of coke, are commonplace. The Eqx easily picked out coins/buttons etc among huge chunks of that garbage, even with decent ID values. My pinpoint probe was useless, sounding off on every lump of the stuff, only by extracting everything and getting the detector to hit on it did I find the targets. My F75 wouldn't have stood a chance, realistically.

The sites I've mentioned are not typical coke sites. Where people burned coal for heat then the waste was discarded. The worst site has small pieces of iron material the size of a BB and slightly larger that are smelted bye products of burnt coal from the furnaces that run the schools hot water boilers. Some areas have such a high concentration of waste that even weeds won't grow. Actually the color of the ground indicates sulfur too.

Hunting with the TDI requires increasing the time delay to 17-20 to pull anything good from the ground.

[Mark-VA]

Except for 6:58, 12:17, and 15:40, all of those are multifrequency waveforms. 6:58 and 12:17 show a 4.75kHz single-f waveform, and 15:40 shows a 45kHz single-f waveform.
1:06 shows a 7.8kHz + 39kHz MF waveform. Others are the same or similar.

So what does the Hz number displayed at the bottom right of the scope mean?
I've looked at the scope and still can't see where you're getting those numbers.
Please explain.