P i detector and coax cable

Brian, the splitter is the problem in your diagram. It's designed for use on a system that is in the Megahertz range while your detector is in the Kilohertz range. Sadly, it will block your signal entirely. Secondly, since shielded cables are scatter wound to provide an effective blanket style of grounding, you will never be able to calculate your windings nor will you be able to drive it without using a FET.

Coax is just not practical for a coil. Thus, I will repeat that it will not work.

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,11341.msg75668.html#msg75668

It is a radio transmitter in the audio range. By default, it generates a field like any radio does. It is a focused field based on the design of the coil and the type of coil. Coaxial, Coplanar, Double D, Double Loop and Mono Loop are all typical types. Some experimenting with multiple smaller coils has been done to some success.

The theory of operation with a PI machine is that the pulse is generated and then turned off. It radiates into the surrounding area and any metal object that is irradiated by the field will develop eddy currents. In the case of ferrous material, the field will be aligned inside of the object and will radiate a very faint signal back to the coil. Non ferrous materials will develop eddy currents on the surface and radiate a slightly stronger and slightly delayed signal back to the coil.

Despite claims to the contrary, discrimination of a PI signal is easily done but the design and use of the detector means that it has always been an all metal machine. The depth of return on a PI machine is less than a VLF/TR machine so they are more commonly used for discriminating type detectors. It's the usage of the machine that causes manufacturers to keep the features low on PI, not the technology.

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,11341.msg75789.html#msg75789

The PI does not use a sign wave that can be related to a audio signal.

It emits a Pulse Wave that is short in duration and separated by a pause .

Read this write up on your basic PI detector and you will see.   

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,11341.msg75935.html#msg75935

Man am I blind as a bat, I thought you wanted the coax to run from the coil, not the coil itself. Don't use what I said to build a coil with the stuff, wasting your time, like they said. What is your reasoning behind it that made you want to try it?

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,11341.msg76158.html#msg76158

cat 5 is do- able though, but  I see your point. Years ago I saw one that you could make that only had about 6 turns of wire and you had to feed the wire in a tube and then solder the wire ends (12) to make it seem as though it was wrapped without breaks. Before cat 5 was invented. I wonder? Na.

Linkback:

You are not allowed to view links.
Please Register or Login

http://www.thunting.com/smf/index.php/topic,11341.msg76344.html#msg76344