I don't post very much, but have enjoyed reading this forum for years. Thought I might respond to this subject since Joe and Mel are talking about me in a nice way. These two guys are good guys and smart. When you need help on your projects, they are the right people to call.
This subject is complicated because there are so many processes which must work together to have a favorable outcome. What JBN said is true. An object that can’t be detected with the presence of one coil can be detected with two since the energy hitting the target would be doubled. The goal should not be to find a means of using two coils in any configuration, considering the effect they would have on each other. The goal would be to increase the field strength of the secondary target (metal in the ground) by increasing the strength of the primary field of the coil on the detector. However, looking at the processes which are active when swinging the coil, one would include specific components molded inside the coil hosing and they would have minimum and maximum ratings which if exceeded could damage them or they might never function properly. Changing the voltage feed could affect frequency and timing which could cause the detector to loose its mind. If the coil has an Op Amp mounted inside the coil and there are Op Amps used on the circuit board inside the electronic housing, the interactive phase of the circuit could be disrupted and render the results useless.
Amplifying field strength is a straight forward idea that can be easily accomplished when designing from scratch. This means building a new coil which can use more power and limiting the return voltage to acceptable levels so as not to damage the circuit board of the detector. This method would be out of reach for most detector people, but done right would allow the user to control voltage and field strength and that would produce many advantages at differing locations.
I plan to do some testing over the next few weeks which will be designed to use existing coils built now days. I hope to discover a possible means to use EMF concepts to boost field strength without changing frequency. I have built a variety of devices in years past that worked nicely, but frequency was not involved. Will keep you posted and would appreciate any thoughts you might have that could help.
Clyde
