BASIC THEORY OF OPERATION
The GEMINI-3 was engineered to detect conductivity changes in the earth over which it is carried. Hence, a positive response by the GEMINI-3 indicates the presence of a metal object, ore vein or mineral that is more conductive than the surrounding rock or soil.
The function of the GEMINI-3 Transmitter is to send a radio frequency (RF) signal down to a conductive object and generate an electromagnetic field around that object. When used in any of the Inductive modes, the RF signal travels through the ground to the object. When used in the Conductive Trace mode (see page 13), the signal is transmitted directly through a wire attached to an exposed portion of the object.
The function of the GEMINI-3 Receiver is to locate the object by detecting the electromagnetic field around it and responding with audio and visual signals.
Gemini-3manual-.ind2 4
Where To Use Your Metal Detector In The U.S.
National Forest and Federal Lands—Metal detecting is allowed only by special permit acquired from the federal government. Each area has a district office.
Corps of Engineers, Lakes, Shorelines and Lands—Permission has been granted only on predisturbed sites, such as beaches and attached swimming areas. New Corps lakes and lands must be okayed by the main office of the Army Corps of Engineers. Each area has a district office.
State Parks and Lands—Some state parks are open to metal detecting, but some are not. Always check with the park ranger before attempting to use your detector.
Bureau of Land Management (BLM) Lands—Some areas are open for metal detecting, and some are not. Always check with the district office.
City or County Park Lands—Most are open to metal detecting unless notice is given by a sign or city ordinance. When in doubt, always check with the city’s Parks and Recreation Department. Public School Grounds—Most are open to metal detecting unless notice is given by a sign, city ordinance, law enforcement official, or school employee. You should always check with the school office first.
Privately Owned Lands (Private Property)—Permission required. It is always best to have the permission in writing.
Historically Marked Lands or Sites—Metal detecting is not allowed. Don’t even think about it.
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