A pulse induction machine however can deal more effectively with much more difficult, variable ground conditions. Unlike a CW machine that transmits and receives simultaneously, a Pulse Induction detector generates a periodic magnetic pulse that excites the ground. During transmission of a pulse, the sensitive receiver is turned off, then turned on a short time after the transmitter is turned off. This means that the very strong instantaneous response from the ground, to the changing magnetic field, is avoided as the receiver is turned off during this time. A target is then much more obvious amid the much smaller remanent magnetic response of the ground. Because of this a PI detector is not exposed to many of the ground issues that a CW detector attempts to deal with. In particular a PI detector can operate in more variable ground together with hot rocks etc.
It is interesting your comments RE Homogenous ground types, I've revisited areas as you have described from the old XT 17000 days (one area only just recently with the GPX 5000) and was surprised by the amount of gold still missed by the VLF detectors!
Is there a reason for this or was the ground a lot noisier than I first thought?
I am in the process of attempting to lease all 80 acres from BLM here, as I anticipate having a blast, and maybe even finding some "Tossed Aside" gold due to the Fed. not being interested in 1" or smaller nuggets! L.O.L.
Any suggestions? DR.
Sorry for the delay in responding I did not know Phil was out on holiday. You have what sounds to be an excellent opportunity for finding some real lunkers, who knows that retirement nugget may be in those piles as well.
I would love to hunt those piles with the GPX 5000 and an 18inch DD coil. The reason being is that the 18in DD coil will offer you excellent depth and allow for some discrimination capabilities along with being able to handle the concentrated iron soils that are sometimes related to that type of hunting.
I have hunted piles in Alaska and other Western states and I have done quite well over the years. I have generally found that the piles offer great depth for a detector as many of them are pretty well devoid of soil from the washing. I have however found some piles that were extremely concentrated in black sands (iron soils) that have always presented a challenge to many detectors.
The GPX 5000 should walk right through the piles with no problems at all. Plus having a little discrimination is very useful in these piles as there always seems to be relics, ok trash from the past like blade shavings belt parts and blade teeth. Not to mention the occasional tin can tossed in.
I would never advocate the complete and total use of discrimination but it does come in very handy in a way to check a dig sometimes before opening it up into a creator.
Starting settings for the GPX 5000 in this type of hunting;
Set the detector in the Sharp timing moving to Sensitive Extra only if the ground minerals prove to be to challenging, set threshold, auto tune, and ground balance. Match the gain to the ground, set your tone to your optimal hearing point, set discrimination level and go hunt. That all takes about a minute and a half then send us pictures of the massive nuggets you find.