IDX-PRO+VDI

[Waikiki_Sweep]

has anyone else noticed the skype tracker i this thread?, dont normally get any trackers here,just seems to be the idx thread.

Everything looks clean from my computer. Can you give more details, screenshots?

[sinclairuser]

has anyone else noticed the skype tracker i this thread?, dont normally get any trackers here,just seems to be the idx thread.

[hoadlies]

Dont forget Barry the null is secondary importance. The correct phasing makes or breaks your coil.

If phase correct by tweaking position of coils, and maybe the Rx cap up or down 1 or 2 nF --- when rejectin ferrite, and irn and accepting all other phases - then take a look at the null.


If 300mY or less leave well alone. Your away.

HI STEVE GREAT ADVICE AS PER USUAL , ALL of my 3 coils built are approx same air test within a coulpe cm or so ,& i tried each time to improve but I must have found the limit of my IDX ,,

What I have improved with these last 2x coils is the GEB -reject ferrite at 11-12oclock & thats good ..

NOW also have a great formula for the graphite shield mix [very pleased to have found that ] of course from much help from this site& members ,,

STEVE ,MY son is interested so we will build another soon & I will buy a bare board to experiment with following your higher frquency mods etc..

Soon to get out to test on actual ground to test the DD vs the coplaner will be interesting..

I am to obtain some fibre-glass woven -cloth in an attempt to make lighter shells & may try as suggested by Waikiki to not use a shell at all ??? but for that I need the woven type cloth for wrapping etc etc ..

I may lookinto some audio mods to raise frequency etc for my old ears HAhaar ,I have done many audio fet projects before ,so into the Junk-box ,,..

The IDX is a great project & I am glad that you STEVE changed my mind from the TGSL ,, THANKS-MATE ,,,,,BARRY..

[seadoggy]

hello guys!Do i need set up something here before i program PIC 16f88??pls help

[golfnut]

Dont forget Barry the null is secondary importance. The correct phasing makes or breaks your coil.

If phase correct by tweaking position of coils, and maybe the Rx cap up or down 1 or 2 nF --- when rejectin ferrite, and irn and accepting all other phases - then take a look at the null.


If 300mY or less leave well alone. Your away.

[golfnut]

"seems once you get to reject the ferrite ,& try as I might I cannot improve the air test A 20 cent size coin AT 30cm .."

You dont want more - what you have sounds perfect.


if you go for a 40" air test, it wont work over ground as the Rx and Tx will be so close. It will false all the time/

try what you have and it will be fine S

[Koala]

Would like to try some self bonded wire I linked to earlier. Anyone know of a supplier to the public the type that uses a alcohol solvent. Found some email for quote businesses and seen a video of it being used but can't find a supplier

[Koala]

THANKS,,, KOALA,,,,for reply ,, null less than 200mv using ac on a good multimeter ????? or on a scope .. ,On the scope trace would I aim for lowest signal for Null ???? [lowest amplitude???] ..I have not tied that !!!.. but can ..

THIS is what I have been doing that is get TX Frequency as close to 6.59 kz with cap selection ,,Then null at minimum on pin 6 preamp .. Then adjust GEB with the RX caps to reject ferrite rod 3/8'' [10mm ,2'' long][usually 22nf+10nf or close to that ]..

MY sensitivity is nervous at full turn [no matter what cap values are used on rx .on a scale 1-10 say on the sens pot no noise at 8 but on say 9 to 10 a low noise .. I have all leads from boards to pots as short & twisted as possible [Do you feel I should use shielded cable instead of wire ]??????.. to allow full use of sens pot ????..
Copper seems to pick-up the futher-est in air test on mine at least ..thin shim 1'' wide folded 3 times in a square picks up better than a 50cent coin OZ coin..

I am still most happy with the unit ,I need to do more ground tests !!!

I feel the DD coils that I built are more sensitive than this new Coplaner 8'' type ..but untill I test on buried coins I will not know ..

I may build a little bit larger DD shape [maybe 11''Xsay 9''????..

ALL GOOD FUN for the Old Grey-Matter HA,Haar..

CHEERS KOALA,,,,,,,,,,,,,BARRY IN ''OZ'' nice weather here today 30c ..

less than 200mv pp on a scope. AC on my fluke multimeter does not work correctly.


"MY sensitivity is nervous at full turn [no matter what cap values are" Just had that problem myself. Just cleaned out my mixing pot. Turns out the epoxy I am using can hold quite a charge of electricity. The flakes of epoxy were sticking to me with the static charge. Will be fine with a proper shield.

[hoadlies]

have you got the sens pot turned fully the right way

with a good null pin 6 U1 less than 200mv you then have to adjust the rx caps for good depth and good phase you can go too far with depth on a air test and the coil will became unstable in the ground

My coils 27cm DD if I go to 40+cm airtest then the coil is no good on the ground too much chatter 40 seems the limit with my builds. That's on a UK copper 2p (25.9 mm diameter and 1.85mm thick)

THANKS,,, KOALA,,,,for reply ,, null less than 200mv using ac on a good multimeter ????? or on a scope .. ,On the scope trace would I aim for lowest signal for Null ???? [lowest amplitude???] ..I have not tied that !!!.. but can ..

THIS is what I have been doing that is get TX Frequency as close to 6.59 kz with cap selection ,,Then null at minimum on pin 6 preamp .. Then adjust GEB with the RX caps to reject ferrite rod 3/8'' [10mm ,2'' long][usually 22nf+10nf or close to that ]..

MY sensitivity is nervous at full turn [no matter what cap values are used on rx .on a scale 1-10 say on the sens pot no noise at 8 but on say 9 to 10 a low noise .. I have all leads from boards to pots as short & twisted as possible [Do you feel I should use shielded cable instead of wire ]??????.. to allow full use of sens pot ????..
Copper seems to pick-up the futher-est in air test on mine at least ..thin shim 1'' wide folded 3 times in a square picks up better than a 50cent coin OZ coin..

I am still most happy with the unit ,I need to do more ground tests !!!

I feel the DD coils that I built are more sensitive than this new Coplaner 8'' type ..but untill I test on buried coins I will not know ..

I may build a little bit larger DD shape [maybe 11''Xsay 9''????..

ALL GOOD FUN for the Old Grey-Matter HA,Haar..

CHEERS KOALA,,,,,,,,,,,,,BARRY IN ''OZ'' nice weather here today 30c ..

[hoadlies]

> Question do you wind a shield wire around the coils say 1'' apart ??? or do you use a single trand on the coil edge ????

I like to make spiral winding over coil bundle with step 0.5-1 inch. I am using 19 stands AWG 24 silverplated wire but spliting it in two bunches of 9 thin strands and wind them over left and right sides of coil.
So you will have reliable contact between graphite shield and grounding wire everywhere. Remember to make a gap! Also if you wave a piece of such 19 stands AWG 24 wire near coil of any VLF or PI detector you will see
that this is not a target and detectors can't detect it so this wire has no influence on your coil setup. Solid wire, aluminum or cooper foil are acting like target so do not use it in your coils.

THANKYOU ,,WAIKIKI ,, that very good information ,as I on my DD coils used a solid copper wire on the edge of the coils [single strand] & yes leaving a gap ..
So next coil I will use your method ..

GREAT,, MATE ,,,,,,,,,,BARRY..

[Koala]

have you got the sens pot turned fully the right way

with a good null pin 6 U1 less than 200mv you then have to adjust the rx caps for good depth and good phase you can go too far with depth on a air test and the coil will became unstable in the ground

My coils 27cm DD if I go to 40+cm airtest then the coil is no good on the ground too much chatter 40 seems the limit with my builds. That's on a UK copper 2p (25.9 mm diameter and 1.85mm thick)

[hoadlies]

hi ,, ALL ,Just a few pics of the 2x new coils I made ..


LEARNING a bit as I go <BUT cannot achieve the air tests that most do on here ,,GEB-OK can do that OK now, it seems once you get to reject the ferrite ,& try as I might I cannot improve the air test A 20 cent size coin AT 30cm ..

CHEERS ALL ,,,,,,,,,BARRY..

[Waikiki_Sweep]

> Question do you wind a shield wire around the coils say 1'' apart ??? or do you use a single trand on the coil edge ????

I like to make spiral winding over coil bundle with step 0.5-1 inch. I am using 19 stands AWG 24 silverplated wire but spliting it in two bunches of 9 thin strands and wind them over left and right sides of coil.
So you will have reliable contact between graphite shield and grounding wire everywhere. Remember to make a gap! Also if you wave a piece of such 19 stands AWG 24 wire near coil of any VLF or PI detector you will see
that this is not a target and detectors can't detect it so this wire has no influence on your coil setup. Solid wire, aluminum or cooper foil are acting like target so do not use it in your coils.

[seadoggy]

hello can i use this PIC programmer to program 16F88-I/P??



I try use that to program PIC!! but nothing not work!!In LCD not show nothing when i place PIC in board of VDI!
Regards

[hoadlies]

Why to use coil shells at all? Without shells coil weights much less and you can build a really big coil.

Technology is relatively easy:

Wind coils.
Cover with insulation, for example paper tape.
Wind a spiral using thin silverplated stranded wires to connect a shield later.
Paint with graphite + epoxy 1:1 by weght, live 5 mm gap.
Wind by fiberglass
Put coil between plastic bags (epoxy not sticks to it) put in on something soft like towel
Pour epoxy (marine epoxy, no polyester please)
Cover with towel then put desk on top, than apply pressure several kg.
After hardening remove plastic bags and sandpaper results.

On picture you can see most of coils 17-18" long.

[ATTACH]28705[/ATTACH]

For DD/SEF/"8" coils left a wire loop to balance it when epoxy gets hard. Loop has to be connected to the grounded end of coil so it has no needs for shielding.

HI-Waikiki,,, I like your method very much Thanks I may give that a try ,it was you,, I think that put me onto the'' Micropore medical tape'' that tape is great & I used it on my DD coils with a mix of Graphite & nitro-cellulose ,furniture satin clear .drys very quick & sticks really well ..
Question do you wind a shield wire around the coils say 1'' apart ??? or do you use a single trand on the coil edge ???? I have it on the outer edge of my coil on top of the tape then coat graphite ..

Thanks for reply ,,,,,,,,,,,BARRY..