northwest quad bike tow coil and the QED
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Tuesday October 15 2019 12:11:33 AEDT PM
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Interfacion Pty Ltd is pleased to announce that the QED PI Detector has been modified to allow the use of DD (double D) coils. This change involves a simple change to the electronics within the control box.
The firmware has also been upgraded to include a further improved Ground Balance.
All detectors being delivered to new customers from Monday 5th August 2019 will already have the above upgrades included.
As a show of commitment to all QED owners, the hardware modification to allow use of the DD and CC coils will be provided at no cost.
Of course and as per the QED warranty, the firmware update is provided free of charge, except for P&H.
Any QED owner who plans to attend the Laanecoorie Bash is encouraged to bring their detector along and have it upgraded at no cost.
Standard postage and handling arrangements apply to other owners. Send via Australia Post the box (minus batteries) along with a pre-paid, pre-addressed bag/box to:
Interfacion Pty Ltd
PO Box 106R
Redan VIC 3350
Howard Rockey
Director Interfacion Pty Ltd.

australian electronic gold prospecting forum.com  |  QED users  |  QED users (Moderator: bugwhiskers)  |  Topic: quad bike tow coil and the QED 0 Members and 1 Guest are viewing this topic. « previous next »
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authere
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« on: Monday April 15 2019 16:00:06 AEST PM »

Hi all,

Working on setting up the QED with a tow coil,so far I have found that the QED can be used at around 2m from engine of quad bike compared to 3m for my gpx4000m, also using cordless headphones that Muntari put us onto a while back which work very well with no extra noise

Having a lot of trouble with what I think is my coax causing my problems, if I move the coax once I,m switched on it sounds off. I don't know if I need to buy a suitable coax or keep trying to get this one functioning

If someone could help I would appreciate it greatly

Cheers Ron
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IBGold
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« Reply #1 on: Tuesday April 16 2019 16:10:14 AEST PM »

Hi Ron,

I take it you are using a mono coil and the coax has been extended what coax are you using it sounds like the coil is picking up the coax at a rough guess.

Regards, Ian. happy face
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Regards, Ian.
authere
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« Reply #2 on: Tuesday April 16 2019 18:37:39 AEST PM »

Hi Ian,

Your exactly right, I used the coil wire continued on for the centre conductor of the coax and wound over that with woven shadecloth mesh then spiral wrap over that. Then covered the spiral wrap with 20 strands of .14mm  as per Stefan's shielding, this joined up with 13 strands of .14mm shielding of the coil , the join for the tail end of the coil windings and the two shields is about 150mm away from the main coil windings

I started the shielding of the main coil windings from the connection point but started winding anticlockwise then clockwise around the coil and the coax shielding wound clockwise , this caused a lot of noise which was rectified and this quietened everything back to "normal"

I now have the problem moving anything , that is coil, detector box or coax, My final parameters are:
.53 ohms
280 mH
a bit more than 400pF's
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IBGold
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« Reply #3 on: Wednesday April 17 2019 16:23:29 AEST PM »

Hi Ron,

A couple of issues first the I take it coil return is joined to the 14 strands of.14 (the coax shield?) and the 13 strands of .14 coil shield the coax shield should have at least the same total mm squared as the coil wire IE if the coil wire is 36/.2 then the coil shield should match it in total area next the join is in the coil field so any movement at all will cause the coil to sound off I take it that your coil wire and shield wire are enameled wires your picture is a tad large and hard to view fore an old bloke.

Regards, Ian. happy face
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Regards, Ian.
authere
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« Reply #4 on: Thursday April 18 2019 19:02:55 AEST PM »

Hi Ian,

Your almost right this time, the 20 strands and 13 strands of shielding are connected to the short end of the coil wire which is of 40 strands x .2mm enamelled cu. wire, to make the connection I shortened the shorter coil wire and joined the three wires and keeping the coil wire straight and twisting the two shield wires around it and laid the join over the top of the coax shielding and taped over it all

What you said about moving the join in relation to the coil makes sense, the reason I used 20 strands on the coax was I thought it would keep the capacitance down lower, I think it ended up being 118pF's for 1.2m of coax. The ohms of the 20 strands was only .15 ohms so increasing the number of strands in the coax shielding should reduce the final ohms of the coil, but I don't know what result will happen as to the capacitance, i guess i'll find out

I now realise that the tow coil that coiltek make is anti interference[AI] so once get this main coil made I will have to make receive coil which I think is wound into a figure eight shape ,but that is a long way away from happening and our detecting season starts on Tuesday so running out of time as usual, but thanks a million for your help sofar 

Cheers Ron, Sherri and Yoda
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« Reply #5 on: Friday April 19 2019 15:43:15 AEST PM »

No problems.

Regards, Ian. thumbs up!
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Regards, Ian.
Reg Wilson
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« Reply #6 on: Thursday April 25 2019 16:37:15 AEST PM »

I have a mono tow Coll and extension lead that had a similar problem to one you describe. I tried all sorts of things to remedy the problem and eventually discover that I had the wiring on the extension lead wired incorrectly. One wire was soldered to the wrong pin.
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