Vallon VMH3CS Mine Detector

[lytle78]

About the software updates - see this - post 1264

https://www.geotech1.com/forums/showthread.php?23169-Vallon-VMH3CS-Mine-Detector/page51&highlight=Vallon+software

[Riss]

Hi Lytle78

Can you tell me what the update entails and the advantages. Regards Ray.

A week ago I saw the oscillograms in a few of the most important points in the reception area on Vallon VMH3CS -very briefly .They use an input amplifier with a gated input . Between the coil and the input operational amplifier there is a key of two SMD VMOS transistors . They are opened 80 microseconds after the transmission pulse is completed. Then I saw the impulses to the analog keys that are in front of the integrators . First sample - about 2 microseconds after starting 80 microseconds reception time section . The first sample is about 2-4 microseconds long. The second sample starts about 25 microseconds after the start of the 80 microseconds period and is about 25 microseconds long . The third sample is about 25 microseconds long -It ends with the end of the 80 microseconds period. There is also a sample that integrates 80 microseconds over the entire reception period . Nothing new under the sun ! I immediately lost any interest towards Vallon VMH3CS . After the measurements I assembled and tested it -worked the same way in all modes .
3 days ago along with 3 friends we performed parallel tests on 3 detectors- Vallon VMH3CS ( 30sm /17sm original monocoil ) -but not the one I measured -I have 2 pieces Vallon VMH3CS , one just unpacked Nokta Anfibio-multi (with search head - https://www.noktadetectors.com/acces...28-cm-11-af28/ ) , and the good old ,,Madmaxovina “(search head 26cm DD ) -Geotech , Tech forum , Thread: About a hybrid , and Thread: Real tests. This is a science ... . Nokta Anfibio measure the soil - showed a figure of around 85 . The friend he brought Nokta Anfibio said that this soil is quite heavy. He also brought a stone (about 26 cm long , about 15 cm wide and about 8 cm thick , quite flat )- my magnet stuck tightly to this stone . I dragged my piece of iron ore - the same from the videos of the above mentioned topics This piece of iron ore causes a reduction of TX current at the end of 260 microseconds long TX period on Minelab GPX4500 working with 39cm/30,5cm DD Commander search head ( 43E6WF &C6073278 ) . The current is decreasing around 7-8 % , when the piece of ore is placed in the area of intersection on TX and RX coils .

. We tested the discrimination under the elongated stone , then registering targets under the two stones ( the piece of iron ore is on the elongated stone ). Under iron ore, discrimination is impossible- for now there is no detector that can do that . Then we checked the registration and discrimination of a 1 lev coin (https://profit.bg/moneti-v-obrashtenie-1-lev/ ) placed in a narrow hole on slope in the soil at a depth of about 21-22 cm . I will not talk about the test results - no video was made . Besides, I was accused of advertising , and bad behavior . I will be a polite, diplomatic and non-conflicting member of the forum. I personally returned to a great mood and a serene spirit of these parallel tests …

[below2doe]

Hi Lytle78

Can you tell me what the update entails and the advantages. Regards Ray.

[lytle78]

The nicer of the two Vallons I got is on its way back to me after upgrading at the US distributor to the latest software version. No charge except for my shipping back and forth (about $40 total on FedEx).

[jarrett]

Something like this.......

https://www.ebay.co.uk/itm/DPM-BERGEN-MILITARY-AIRSOFT-ARMY-BAG-POUCHES-SIDE-ZIP-BACKPACK/223367333045?hash=item3401bb04b5:g:XPkAAOSwl1FcPoCf:rk:2:pf:0

[jarrett]

I asked Vallon USA rep about this. His thought is that it is a specific feature ordered by the UK MOD - probably in order to zip it together with other parts of their standard soldier load carrying system.

Your rep is correct, they use the same thing on radio backpacks /bergens.

[brinbrin]

Thanks for the answer. I'll search in this direction. That'd be confy to have an additional pocket (pinpointer, headphones, etc.)

[lytle78]

I asked Vallon USA rep about this. His thought is that it is a specific feature ordered by the UK MOD - probably in order to zip it together with other parts of their standard soldier load carrying system.

[brinbrin]

Hello,

Does anyone know the purpose of the two upper straps and the two half zipper on the Vallon VMH3CS backpack ? Are there additional pocket for the backpack ?

Best regards,

Brinbrin

[jarrett]

Hi Jarrett,
Sorry about the delay in answering, and welcome to this thread. Firstly have a look at pages 465, 672, 707, 769, where you will find some information about audio mods for the Vallon. If you want to run standard low impedance headphones, the transformer mentioned is available on eBay. Any further questions, please ask on this forum thread, or send me a PM.

Eric.

Have fitted a pair of passive piezo's(no circuit inside ac feed) wired in parallel and they work ok after reading previous posts on the subject, one question though could this do any damage to the detector board as i would hate to mess it up for the sake of a set of headphones, has anyone dismantled the original earpiece and acertained what type of piezo it uses.

[Altair]

You might try the place in Poland that sells the surplus units. They have broken ones for $100 with $50 shipping to the US.

Thanks lytle78 and others for replies.

[Guzzi]

Thanks, but not much in the store.

[chevesne]

http://tdm-electronics.com/

On Eb..https://www.ebay.com/str/tdm-electro...p2047675.l2563

[Guzzi]

What is the adress of the place?

regards

Leendert

[lytle78]

You might try the place in Poland that sells the surplus units. They have broken ones for $100 with $50 shipping to the US.