Ive heard that a DD coil is available for the GQ. Where? JT

[Anonymous]

Seems to makes sense to use a DD considring that it sees more at depth. That where the good stuff is at the beach aint it.
Anyone know how much these DDs are for and where to get them?
JT

 

[Anonymous]

Hi JT,
I started this discussion about the GQ with a DD when I built my own and modified my GQ clone. As far as I know, they are not available for sale at this time. I did build one for a guy when my PI was much closer to the GQ in design, but that was quite a while back.
Unfortunately, I have made enough modifications to my PI that I am not sure I could build one that would work correctly for the GQ without the detector present. So, I would really not do it, at this time. To make matters worse, I am still in the process of trying to find the "ideal" coil design myself. A lot depends upon the application.
So, as far as I know, any DD would have to be a "do it yourself project, which is what I had intended when I brought up the subject. At the time, I knew there were several people monitoring this website that were into modifying their PI's and that is one of the reasons I mentioned them.
As for more depth from a DD, I am not sure that is true, at least from a theory standpoint. So, I am sure we will catch some flack for that one. However, I have found the DD to be so much quieter and have so much less ground pickup where I normally hunt, that the net effect is I get as good of depth, and in some cases, better depth than I do with the mono coil. It all depends upon the ground conditions as well as the external noise level.
Sorry about any misunderstanding.
One other thing, the GQ does have to be modified to accept a DD coil, otherwise it will not work. Also, depending upon just how the mod is done, the original mono coil wiring at the plug may have to be modified also,otherwise it would not work. The mods are minor from a technical standpoint but are necessory. However, they do require good soldering skills and a trace on the pc board be cut.
One should also realize that any modification would most likely void any warranty.
Reg

 

[Anonymous]

Reg is right,
I have one of his DD coils, You'll lose about an inch from air testing but will gain this back when hunting difficult ground when one has to use more SAT and more delay on a mono coil. This applies to all Pi's. You won't need as much or use no SAT when using the DD coil, The unit will smooth out and operate with better stability than the mono coil. Out in the field they get about the same depth.
As far as the mod, I applied the same to one of my headhunter Pi's which now accepts the 11" DD coil, I was lucky the GQ DD Coil will work on the HH PI. Like Reg said, It's a simple mod but you'll need to add on jumpers hidden inside the cable connectors for the unit to accept both coils after you've cut the trace.
JT, You're fine with using the 11" GQ coils Eric makes, They are the best Pi mono coils made in the world. Believe me, I've been testing several Pi mono coils the past few months and they are bar none the best. No other's come close.
HH, Paul (Ca)

 

[Anonymous]

Hi Paul,
I think I remember reading somewhere within the message thread maze, mention of a high pass filter mod fitted to your unit to reduce low frequency (ground) noise?
Thanks
Kev.

 

[Anonymous]

Hello Kev,
Yes, That's another mod that helps the Pi smooth out when the ground really gets nasty. When applied the unit will still respond to the smaller nuggets or small conductors and sharpen the smaller conductors to come in clear when interference is a problem. Like the DD coil, The unit will lose depth "not much" but gain it back out in the field with smoother stability. Otherwise, When the ground is good then the mono coils are the better coil which can achieve more depth over the DD coil..
HH, Paul (Ca)