An Independent Report
REPORT ON THE WHITE’S GMT
Upon reading the product manual introducing the new ‘GMT’, the latest metal detector from Whites’ Electronics, I found the set up to be quite easy, as the basic suggested settings on the GAIN (preamp) control and the ‘S.A.T.’(Self Adjusting Threshold), are marked on the control scale.
I realized these settings are obviously for average conditions in the U.S.A. But for start up, these basic settings will do for Australian conditions, but do allow for different settings in higher mineral soil conditions. The best all round settings I found, using the machine in the Dunolly region, are to run the ‘S.A.T.’ flat out as far as the control knob goes and to cut the GAIN control back to 4-5 on the dial setting.
Setting the Automatic Ground Balance is exceptionally fast, this is simply done by gently pumping the coil up and down from the ground, only two pumps was required and I discovered this was enough even in very hot (highly mineralized) ground.
Because this machine is more sensitive than similar Auto Ground Tracking machines it is critical to start sweeping the coil slowly – but that is the secret with all detectors – "low and slow".
The new 250mm elliptical ‘Double D’ coil is quiet in operation, there are also 2 other add on coils which are both mono loops, the 250mm and the larger ‘Blue Max’ 350mm elliptical which will give greater depth, these are noisier in warm to hot ground, but if you slow down on sweeping and allow the Auto Ground Tracking to ‘catch up’, the machine remains pleasingly stable. There are also other coils that can be used on the GMT as well as some new ones soon to be released.
The Auto boost I found was hardly necessary as the sharp response was more than ideal, headphones are a must as the response using them was very crisp and clear, ones with a volume control would be preferred as no volume switch is on the machine and the audio is quite loud.
On targets that I purposely set up at varying depths and sizes the GMT performed very impressively.
The Digital read-out response meter is steady and reasonably accurate with Ferro (iron & Steel) probability. In very bad hot ground if the machine tends to overload, the read-out will tell you to ‘reduce gain’ to run quieter with no loss of depth. Another brilliant asset in using the GMT is that it can tell you the amount of mineralisation in the ground, this is handy for tracking the gold bearing mineralized ground.
To sum up, I was very impressed with the handling of this new machine, weight and comfort of use was excellent and I have not used ANY other machine that will AUTO Ground Balance as fast in all conditions on start up.
With the asking price of this detector being a lot less than others on the market, the GMT is a sturdy, light weight machine which provides a wonderful alternative to other auto tracking machines presently available.
Neil Saville
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FINDERS PTY. LTD.
90 Broadway, Dunolly, Victoria, Australia. 3472
Tel: 613 5468 1333
FAX: 613 5468 1130
Email: finders@finders.com.au