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The problem with this system is 2 fold:

1. The detector WILL pick up the connection and lower the performance, this I proved years ago with PI detectors and the aluminum shafts going to non metallic gave a performance increase not much but the detector will see the metal and balance it out on balancing.

2. if the connection being inside a larger shaft moves you will get falsing signals as although when the connector is stationary it will get added to the balance of the detector when it moves however could lead to the detector picking it up...

Just my thoughts on the cable, better for the Xcoils to use a curly cord or provide a longer cord and the user can then make it into a curly cord if the manufacturer doesn't want to do this...

I would have to agree with Ismael on this.
Even though there might be no obvious interference from having the connector that close, it sure could interfere in certain conditions.
With Pi detectors , you can place a target on the coil, wait for the threshold to stabilize and then use a piece of ferrite that normally would make no response and find the target that is sitting stationary on the coil.
Although it is a pain in the backside, I think it would be worth it to just keep it as you already have it.

Cheers Mick

Absolutely agree with the electronic engineers on here, but (& here comes my thoughts on the matter). The metallic connector, looks like being or approx 20 inches further up or away from the coil. So even if the connector is capable of being seen or picked up by the coil, at that distance away, it would be the faintest of signal response & easily cancelled/balanced out. The main thing here is to make sure that the metallic connector stays in unison with the movement of coil & the 2 rubber washers should keep the connector at a snug fit within the shaft, preventing any vibration or movement. If this is the case, I don't see why not all things working perfectly well, but I could be wrong for I'm no electronics wiz.
Give it a good thorough test-over Dave (especially on the touch/bump sensitivity side) & let us know what your thoughts on this matter are, for Chet could be on to something good here (for the wearing out of parts from screwing them on & off all the time, would be on the cheaper coil connector side & not the connector in the control housing), as well as much easier in the changing of coils.

Cheers gents Kon.

Would agree with Isamel on this also ... have made extender cables in the past ...
just doesnt cut the mustard ....

If the ground signal is greater than the signal created by the connector then no problem, however if it moves around it will kill sensitivity and depth, in a lot of cases you won’t even be aware of it. And of course a 17 round is going to outperform a 17 x 12 elliptical.

JP

Dave, thanks for your time and effort to bring us details of your testing. Hope you get onto some gold as a bonus.

davsgold wrote:
and if it does not move around?

If the coil can see it but it does not move relative to the coil then there will be some sensitivity loss, however if the ground signal is greater than the signal created by the connector then the ground signal holds sway.

Personally I don’t think this will be a major issue, the upper aluminium shaft of a GPX is at a similar distance from the coil and I’ve dug many many deep nuggets with those. Also DOD coils tend to have poor signal response when deeper targets get away from the dead centre of the coil, the sweet spot on a DOD is right under the yoke of the coil.

The things to look out for are spurious responses similar to EMI, they can be identified by noticing the response is associated with bumping or knocking depending on how loose the connector is, loose will be a rapid EMI like sound, minor restricted movement will be more subtle.

I think in the case of the X coils and the need for an adapter this is a better approach than the short connector that’s vulnerable to damage every time the detector is shortened and lengthened, the main body of the curly lead on the longer version will soak up the bulk of the strain cutting way back on potential failure. For piece of mind I would happily sacrifice a tiny little bit of sensitivity in quiet ground over reliability any day.

JP