Does any company sell a two-box detector with iron discrimination?

[Jim in Idaho]

I use a two-box (TF1200), and would really like to be able to disc out iron objects. I've never seen a two-box offered that had that ability. Is it not possible to make one?
Jim

[ivconic]

I can't imagine how it can be done. Conventional 2box can't.
Though there is $12000 Russian new one, they claim it can.
So far only for military purpose. Not available for a open market and wholesales.
But than again; it's not conventional 2box.

[kt315]

Jim,

TM-808 can. But you will not use it in DISC mode because you will get/notice poor depth.
anotherway, you just PAY the disc for the depth.
also, you will see this in every VLF detector. in disc mode you sure lost the depth.

[Mario-j23]

Polski Smętek on steroids. No one produces it, made by yourself.

[Jim in Idaho]

Thanks guys. KT, I knew the TM808, and the similar TF models could be run in Cave/Trace mode to ignore iron, but the TM-808 does it by changing to a T/R type detection. I'm not sure how the TF models change to Cave/Trace. I wanted to stay in the same mode for all metal, but have adjustable disc. I'm still learning this 2-box/data logger system. Ivica....I'm laughing over that $12,000 price tag. Don't think that's going to happen if i want to stay married. Mario, I may look into building a setup like that. I'm familiar with electronics...was a radar tech in the military, but I'm not an engineer like you guys. I have to go really slow...LOL
Jim

[Carl-NC]

Cave mode is the same as TR mode. Both the TF and early TM models can run in either a ground-balanced VLF mode or in a non-GB TR (cave) mode. The GB mode is non-motion and uses a phase-balanced demodulator. I believe the TR mode skips the demod and uses a peak detector with a retune circuit. Late model TM808s changed to a Coinmaster 6000 circuit which uses quadrature demods and it dropped the cave/TR mode, so it only runs in GB mode. However, because it has quadrature demods you could patch in a disc circuit that gives you a ferrous/non-ferrous indication. Without motion filters that's about all you can do, adjustable disc won't work because the phase will vary a lot with coil height above the ground. And motion filters won't work well on a detector you can't swing. With the TF and early TM with only a single demod you cannot easily add an iron indicator, you would basically need to redesign the whole thing.

Bottom line: A ferrous indicator is possible only on the late model TM808 but would require designing an add-in circuit. I don't think it would require any mods the main TM circuit.

[Jim in Idaho]

Many thanks, Carl. Of all the engineers on here, you always have the most concise explanations of how detectors operate. I knd a thought it was probably something along those lines, but nice to have it fully explained. I'm attempting to think outside the box, and use the two-box, with Tim's data-logger as a prospecting unit (not nugget hunting). So far in my testing, the combo can see a 12ga. copper wire 24" long at 24" (buried in the ground). I think that's pretty good. but Trace mode can't match it. But Trace can see it at 12" which ain't bad. I wish I had the Trace attachment...it might get me more depth. I'm looking, but haven't seen one for sale.
Jim

[kt315]

I'm not sure how the TF models change to Cave/Trace.

TFs, both, have one schematic and without Cave mod. Carl gave detailed report, just TM-808 has complicated circuit. it is sure one mode/part from 5900/6000 DI PRO SL.
also, last version of TM-808** was done using SMD and has specs that nobody knows.

** before closing.

[Jim in Idaho]

I'm not sure how the TF models change to Cave/Trace.

TFs, both, have one schematic and without Cave mod. Carl gave detailed report, just TM-808 has complicated circuit. it is sure one mode/part from 5900/6000 DI PRO SL.
also, last version of TM-808** was done using SMD and has specs that nobody knows.

** before closing.

According to the owner's manual, the Trace mode can be used as Cave mode. What is SMD?
Jim

[Alexismex]

Hello Forum,
I have always found Two Box or Pulse detector with discrimination to be completely useless because coins or silver or gold bullion are almost always accompanied with some iron, such in a box or knife, etc... I have personally found coins in iron mail bags. The detector in discrimination mode will not detect this noble metal.In any case, you always have to dig to find out what the target really is.It's my personal experience!I have worked with Tim's loggers for several years and have given many advice to friends. It is good, but I repeat, you have to dig!!!

[kt315]

Surface-mount technology - Wikipedia

[Jim in Idaho]

Surface-mount technology - Wikipedia

I thought it was probably "surface mount", but wasn't sure about the 'D'.
Jim

[Jim in Idaho]

Hello Forum,
I have always found Two Box or Pulse detector with discrimination to be completely useless because coins or silver or gold bullion are almost always accompanied with some iron, such in a box or knife, etc... I have personally found coins in iron mail bags. The detector in discrimination mode will not detect this noble metal.In any case, you always have to dig to find out what the target really is.It's my personal experience!I have worked with Tim's loggers for several years and have given many advice to friends. It is good, but I repeat, you have to dig!!!

Thanks, Alex. I've come that conclusion. Obviously, there's more digging in my future.
Jim

[Carl-NC]

SMD = Surface Mount Device
SMT = Surface Mount Technology

The trace attachment is only useful for tracing utilities where you can physically attach the tracer to the buried wire/pipe. It won't help with locating isolated buried targets.

12ga wire at 24" is quite good. Without the data logger, would you have noticed it in the live audio response?

[boilcoil]

I thought it was probably "surface mount", but wasn't sure about the 'D'.
Jim

.......................An electrical component mounted in this manner is referred to as a surface-mount device (SMD).........................


Sorry Carl, I was late...