Vallon VMH3CS Mine Detector

[Davor]

@Qiaozhi
Err... G. Paltoglou might object to this, although his method relies on the imperfection of PI that happens with Tx ON period being shorter than the Rx last sample time.
A certain company made a ritual out of it by creating silly Tx timing schemes.
Discrimination is doable with PI.

[kingswood]

Hi MdToday
Yes Thanks
The only Problem im having is The limitations on the discrimination setting and the limited tone that it gives, everything so far sounds the same but im not giving up yet, got a sneeky feeling this is very similar to the Garrett gatx and if im right this unit should be brilliant on the beach.

Go Get Them Hammerd Coins.

In my experience with the Vallon, it doesnt have the ability to discriminate metals....but, I have noticed that the Vallon screech does sound a bit different on different metals. I would not trust that though and would just dig every signal In regards the LED's, this is simply the strength of the signal and doesnt relate to what type of metal it is....

[Qiaozhi]

That Interesting Eric
Was That with the standard coil does the led or tone change with differant metals as i dont seem to be able to tell at the moment?.

cheers all please all keep up the good work.

Any news on how to flash these units yet?

There is no ferrous / non-ferrous discrimination on the Vallon. It's a PI, and therefore can only discriminate based on conductivity.

[roadhog]

That Interesting Eric
Was That with the standard coil does the led or tone change with differant metals as i dont seem to be able to tell at the moment?.

cheers all please all keep up the good work.

Any news on how to flash these units yet?

[Ferric Toes]

Hi MdToday
Yes Thanks
The only Problem im having is The limitations on the discrimination setting and the limited tone that it gives, everything so far sounds the same but im not giving up yet, got a sneeky feeling this is very similar to the Garrett gatx and if im right this unit should be brilliant on the beach.

Go Get Them Hammerd Coins.

I did an air test on a 13th century silver hammered coin 18mm diameter and 0.8mm thick. It has a cross on one face, all arms the same length that goes right across the diameter both ways. You probably know the one. The Vallon will give a discernable and repeatable signal at 13in. I also tried a small bronze Roman coin., 15mm.D and 1.3mm thick. I get this at 11 - 12in.

Eric.

[jaypay]

No discrimination setting as far as I know.

[roadhog]

Hi MdToday
Yes Thanks
The only Problem im having is The limitations on the discrimination setting and the limited tone that it gives, everything so far sounds the same but im not giving up yet, got a sneeky feeling this is very similar to the Garrett gatx and if im right this unit should be brilliant on the beach.

Go Get Them Hammerd Coins.

[Davor]

If you can over tighten it, you surely screwed it up

[Ferric Toes]

If yours comes in a canvas bag, do not breathe the dust, the battery cap can be a bit dicky when you first insert the d cells
so switch the machine on, then slowly screw on the cap until the machine starts up, this gives you a better feel for how much
pressure the cap needs to make good contact, and how tight it should be.
The manual has a few strange comments in it and does not describe all the functions and processes fully in good english.

I have found that in a few Vallons, the battery cap is very hard to engage in the threads on the battery holder. In these cases, presumably, it is because the battery tube is not set in its correct position after a service. This is probably when an arm cup has been replaced when the whole back end has to be removed. The contact end of the battery tube should protrude from the threaded collar that the battery cap screws onto by between 1 - 1.5mm; no more. Another thing that helps is to put a smear of silicone grease either on the O ring on the threaded collar, or on the smooth inside lip of the battery cap. The metal plate in the battery cap contacts the bare lip of the battery tube, so you screw it up until you feel a solid stop. You cannot over tighten. Has to be like that for the military.

Eric.

[6666]

Hi roadhog,

Sounds like a good detector, I'm waiting on mine to arrive in OZ so cant help much at the moment but I will post my experience.
In the meantime, have you looked at the Vallon manual via the link that was posted earlier in this thread?
Good luck with it.

Brian

If yours comes in a canvas bag, do not breathe the dust, the battery cap can be a bit dicky when you first insert the d cells
so switch the machine on, then slowly screw on the cap until the machine starts up, this gives you a better feel for how much
pressure the cap needs to make good contact, and how tight it should be.
The manual has a few strange comments in it and does not describe all the functions and processes fully in good english.

[Mdtoday]

Hi roadhog,

Sounds like a good detector, I'm waiting on mine to arrive in OZ so cant help much at the moment but I will post my experience.
In the meantime, have you looked at the Vallon manual via the link that was posted earlier in this thread?
Good luck with it.

Brian

[roadhog]

Hi All
So i managed to get out for a couple of hours today to have a play with the Vallon VMH3CS.
So first impressions are its well built rugged piece of kit as for using it for general metal detecting ie in a farmers field looking for the elusive hammered coins i am not so sure as yet?
Iv not found a way of discriminating against iron or copper at the moment it all sounds the same to me, as for the led display still trying to work that out too.


would be handy to know if anyone out there has had some more time on this unit and could put up pictures or video to explain more.

Cheers all

[Mdtoday]

Interesting, thanks Eric.
Would you mind posting a pic of the socket connector front view when you get time to please Eric.
It's possible they have used a mil spec connector insert and machined it. There doesn't appear to be an over-mold.
Seeing the front view would help narrow the search.
I'll keep looking.

Brian

[Ferric Toes]

Hi Eric,
If it's not too much trouble, could you post some pics of the 7 pin connectors please.
They look suspiciously like Conxall Mil-E QUAL series connectors with custom over mold.

Brian

Hear are a couple of pictures. The two inserts appear to be the same except that one is male and the other female. The bodies are a rubber type material with an additional O ring on the shaft side. Both are held into the housing with a threaded plastic retaining ring. This is seen detached from the connector body in the smaller picture. The coiled cable goes into the telescopic shaft. The wire loop connects to the 6 outer pins which are electronics ground.

Eric.

[tifred]

Hello eric
The tape looks like this, nickel woven canvas.
A photo piece that I retrieved on a computer
,is conductive...