Vallon VMH3CS Mine Detector

[kingswood]

I hope the 30cm coil is a good investment and gives some useful extra range. If I were in your shoes, I would be looking for the bigger nuggets too. I couldn't be bothered with the sub-gram bits.

Eric.

Happy to take what I can get....But hopefully the bigger coil gets a bit better depth to get anything larger and deeper!

[Ferric Toes]

Standard headphones for the VMH3CS

I managed to put together a small plug in unit which enables the Vallon to be used with normal, inexpensive moving coil headphones. It also appears to work fine with an FM wireless module and FM headphones. The angle of the FM transmitter can be altered to give the best reception to the phones. I wonder how this wireless method will work on a wet beach where basically you have a huge ground plane which may affect the propagation from such small antennas.

Eric.

[kingswood]

Looks very professional.
I hope they work well on the beach.

[Altra]

Based on Eric's earlier post. I used a matching transformer and some pvc pipe fittings to make an extension to 1/4in. adapter. It keeps the headphone cable out of the way behind the armrest. The pipe fittings are 3/4" and the pipe is 3/4" schd20 thin wall. The transformer is unmarked, but I believe it is about 600ohm : 8ohm. I have tested it with my "Nugget Buster" headphones and some homemade piezos. Very loud.

[kingswood]

Some great headphone ideas here! Thank you
I will get onto making similar.

[kingswood]

I was reading about Vallon detectors on another forum. Found this interesting: "As a professional user of many types of detection equipment, down to the simple MD, I can assure you a Vallon will easily detect the items as you described. My personal detector is the VMC1 with modifications perform by me. Vallon will NOT modify detectors from their intended design. So don't even ask them"......I wonder what the modifications were?!!!!! I have sent the writer a msg, but given the post was quite old, I am not confident of a reply

[6666]

Based on Eric's earlier post. I used a matching transformer and some pvc pipe fittings to make an extension to 1/4in. adapter. It keeps the headphone cable out of the way behind the armrest. The pipe fittings are 3/4" and the pipe is 3/4" schd20 thin wall. The transformer is unmarked, but I believe it is about 600ohm : 8ohm. I have tested it with my "Nugget Buster" headphones and some homemade piezos. Very loud.

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Nice invention, I picked up some piezos, one day will install in earmuffs, I've done this before with rocking armature receivers out of telephone handset.

[6666]

Eric re your FM cordless TX, great invention, I have used a digital tuned FM TX similar to the one in your picture, I used it on my Ace 250, worked very well, had a small problem with over driving the audio , just needed a small inline pot to reduce audio, and then worked perfect, used a pocket FM rx to listen to signal.

[garyq]

I was reading about Vallon detectors on another forum. Found this interesting: "As a professional user of many types of detection equipment, down to the simple MD, I can assure you a Vallon will easily detect the items as you described. My personal detector is the VMC1 with modifications perform by me. Vallon will NOT modify detectors from their intended design. So don't even ask them"......I wonder what the modifications were?!!!!! I have sent the writer a msg, but given the post was quite old, I am not confident of a reply

I read also on another forum that for deeper detection, the better Vallon detector is the VMH3CS with the 60cm diameter UXO search head, which can find large projectiles down to ~4ft, so relic target depth would be dependent on how much metal they have.

[kingswood]

I read also on another forum that for deeper detection, the better Vallon detector is the VMH3CS with the 60cm diameter UXO search head, which can find large projectiles down to ~4ft, so relic target depth would be dependent on how much metal they have.

I have the 30cm UXO coil so will see how that goes
I read a lot of test reports and the Vallon with the 30cm and 60cm search heads did very well on half a BLU-26 bomblet, which as far as I can work out has a weight of 220 grams of metal.
All quite promising!....the 30cm coil should detected a 2 kilo nugget quite deep!....Now just have to walk over the top of one ha ha

[6666]

I have the 30cm UXO coil

Have you tested it yet on a 5cent and 2 dollar coin ?

[kingswood]

Have you tested it yet on a 5cent and 2 dollar coin ?

Sorry mate, not yet. Have been busy at work and with sick kids !!
Will try and get an air test done this weekend !

[TH'r]

Hello Eric; Tried this experiment with the following results. When I held "C" down in volume mode I got LED's 6789 followed by 2 & 11 (not 12) on the less sensitive to EMI Vallon. On the more sensitive to EMI one I saw 6789 followed by 9 & 13 (not 12?). I changed the channel to #2 but there was no improvement in the EMI situation.

More experimentation. How many channels do these Vallon's have? Mine seem to have four banks of 10 channels each with the numbers 11,12,13,14, being the group or bank numbers. After considerable trial and error I found Ch. 5 of Bank 11 made my noisy Vallon completely quiet.

[Ferric Toes]

More experimentation. How many channels do these Vallon's have? Mine seem to have four banks of 10 channels each with the numbers 11,12,13,14, being the group or bank numbers. After considerable trial and error I found Ch. 5 of Bank 11 made my noisy Vallon completely quiet.

That is interesting . The manual mentions 40 channels and I wondered how they came to that number. I will have to set one up on a frequency counter to see the range of the TX prf. over the 40 channels.

Eric.

[ivconic]