northwest Home made Coax for a Mono Coil ( to suit Minelab GPX detectors)
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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils  |  Topic: Home made Coax for a Mono Coil ( to suit Minelab GPX detectors) 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: Home made Coax for a Mono Coil ( to suit Minelab GPX detectors)  (Read 377 times)
autitch
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« on: Tuesday June 26 2018 13:47:12 AEST PM »

Question for the brains trust.

 Would the coax shown here work any feedback, suggestions and improvements are welcome.   The idea here is to make a low capacitance coax by running the TX wires up the coil cable to the plug(saving a soldered joint at the coil) and using a 316 stainless steel mesh as a cable shield.  The earth drain wire is soldered at the plug to one of the TX wires and runs from the plug to the coil shield.  The earth drain wire is also soldered to the  316 stainless steel mesh  cable shield.  The 316 stainless steel mesh cable shield won’t physically touch the coil shielding but electrical connection will be provided via the earth drain wire.  The earth drain wire will be used to earth the coil shield.

AuTitch


* COAX MK1.JPG (28.63 KB, 534x246 - viewed 100 times.)
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« Reply #1 on: Tuesday June 26 2018 17:05:10 AEST PM »

Hi autich,

I have tried most of the different ways but found that there was no appreciable lowering of capacitance the best method is to use the coil wire input as center of coax then apply spacer ideally Teflon spiral wrap to about 8mm OD then remove remove the sleeve of the earth side of the coil wire and spread the strands and spirally wrap over the spacer along with your shield wire then cover the lot with heat shrink sound easy but in practice not so and with this method Litz is best .

Regards, Ian. happy face
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Regards, Ian.
autitch
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« Reply #2 on: Thursday June 28 2018 11:39:23 AEST AM »

Thanks Ian
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australian electronic gold prospecting forum.com  |  Detector Technology and Electronics and new detectors  |  Detector Coils  |  Topic: Home made Coax for a Mono Coil ( to suit Minelab GPX detectors) « previous next »
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