Hi All,
I have just obtained a Vallon VMH3CS mine detector and am surprised at how good the performance is. I've not done any detailed tests as yet, but it will detect coins at great distances in air and a 0.3gm gold nugget at 2-3 inches. This is without ground compensation. With compensation switched in (mineralisation on switch) it will cancel a substantial piece of Australian ironstone. The machine is fantastically rugged and runs off three D size batteries, so it feels a bit heavy, but is reasonably well balanced. The search coil measures 1.5mH and is 3 ohms resistance. TX pulses are bipolar and 50uS wide. It is not immediately apparent how such narrow pulses are effective using a coil of 1.5mH.
I have been off the forum for quite a long time and would be interested to know if anyone else has experience with this detector. I shall take it to the local beach next week and see how it performs there.
Eric
I have just obtained a Vallon VMH3CS mine detector and am surprised at how good the performance is. I've not done any detailed tests as yet, but it will detect coins at great distances in air and a 0.3gm gold nugget at 2-3 inches. This is without ground compensation. With compensation switched in (mineralisation on switch) it will cancel a substantial piece of Australian ironstone. The machine is fantastically rugged and runs off three D size batteries, so it feels a bit heavy, but is reasonably well balanced. The search coil measures 1.5mH and is 3 ohms resistance. TX pulses are bipolar and 50uS wide. It is not immediately apparent how such narrow pulses are effective using a coil of 1.5mH.
I have been off the forum for quite a long time and would be interested to know if anyone else has experience with this detector. I shall take it to the local beach next week and see how it performs there.
Eric
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