To twist or not

[mykaitch]

I recently read a thread on another inferior forum about the cable from the coil.
It was said that a cable twisted around the pole caused all kinds of problems;
that it should be straight up the pole (ooh err missus) and any slack coiled behind the controller.
On my last field test with cable wrapped many times around the pole I found that if I knocked
anything I would get a beep.
Out of curiosity I made the cable on my latest head dead straight with only 2-3 inches slack at the box.
I can hit a fence now with no false signal.
Interesting?

[Waikiki_Sweep]

It is wery good suggestion!!!! Also one of the most expensive detectors on the market CTX3030 holds cable inside the pole. No wrapping. Should be used in every design.

[migusch]

Hello, mykaitch!
Did you build another coil with a shorter cable, or did you shorten the cable of the same coil that caused problems at your "last field test". (I understood you the way that you built a new coil. Shortening the cable of the "old" coil might be an interesting experiment...)
From my point of view it is likely that the reason for the erroneous beeps is located within the searchhead and not the cable itself.
I myself use a slightly longer than necessary cable that is wrapped around the stem several times and there is no chatter or erroneous beep at all (PI with monocoil, cable and coil shielded; lower stem isolator, upper stem aluminium ).
Which technology is your detector. Are your coil and/or cable shielded? What is the material of the stem (conductor or isolator?)
Did you pot the coil with epoxy in a rigid housing or could there be minimal movement of the coil within the searchhead?

In PI-design it is wise to use the shortest possible cable to connect the coil with the box to get the fastest coil possible. My next coil will be constructed that way.