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Offline gambol1Topic starter
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« on: March 19, 2011, 06:42:16 am »
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I have just purchased a 5" coil for my Fisher 75 and like the way it works. Both the fisher and my ACE 250 are "double d " coils. What would happen if I put the 5" coil on my ACE 250?  Anyone with experience there?

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Offline GoldDigger1950
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« Reply #1 on: March 19, 2011, 06:58:25 am »
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Just taking a guess here but both machines will not be harmed without a coil at all on them. The impedance drives up to infinite and so does the inductance. They would not work, of course, but they should be unharmed. Now, adding a coil with an incorrect configuration might just cause harm depending on how they were different. Since both might just be under warranty, I wouldn't risk it.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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Offline gambol1Topic starter
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« Reply #2 on: March 19, 2011, 07:14:09 am »
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GD, thanks. I won't if its going to hurt the machine. I recall when I was a kid I burned out the transmitter of a cb radio when I hooked it up to a TV antenna. I may have been bad impedence matching or maybe I just shorted it out. gambol

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« Reply #3 on: March 19, 2011, 09:34:03 am »
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Just out of curiosity, are the connectors even the same?

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Offline gambol1Topic starter
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« Reply #4 on: March 19, 2011, 11:04:26 am »
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Homefire, Yes they are both 5 pin DIN type connectors or that is what they appear to be. I'm not taking any chances though. I love my ACE 250 and I'll just wait till I can get the Garrett 6" coil on e-bay.gambol

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« Reply #5 on: March 29, 2011, 12:55:46 pm »
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Hi,

Do the coil and the unit need to operate at the same frequency?  And do they need to be exact or is there some room like a 17.5 coil on an 18 machine?

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Have a good one or two......

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« Reply #6 on: March 29, 2011, 01:02:23 pm »
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Heck I'd ask Garrett but what GD said would give me an under pants situation if i was wrong and tried it

AU

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Offline GoldDigger1950
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« Reply #7 on: March 31, 2011, 04:57:00 pm »
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Regarding frequency shifts, you could cause a frequency shift so far that the receiver would be detuned making your detector a light weight brick with a stick on the end. That's the extreme possibility. Most likely it would cause greatly reduced functionality. Either way, just get the notion out of your mind. Buy a coil made for your machine. Can't afford it? Save your modern coins until you can. Or cash in a gold ring or two.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
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« Reply #8 on: April 23, 2011, 01:14:37 pm »
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Here are my two cents.

The F75 operates at a frequency of 13 kHz, while the Ace 250 operates at 6.5 kHz.  The coil of a metal detector is actually a tuned LC circuit (inductance from the loops of the wire and capacitance from the spaces between the loops of the wire).  Each coil has a resonant frequency where the impedance of the inductance (+jxl) and impedance of the capacitance (-jxc) cancel each other.  The total impedance of the coil is (r+jxl-jxc), therefore when xl equals xc then you are left with only the pure resistance of the coil and you get maximum field strength (max detection depth).  The frequency at which xl equals xc is the resonant frequency.  Which in the case of the F75 is 13 kHz and with the Ace 250 is 6.5 kHz.  Therefore, by replacing a coil with a different resonant frequency then the operating frequency of the detector you will not achieve max field strength and therefore your detection depth will greatly suffer.  Therefore, I would not recommend the switch.  

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« Reply #9 on: April 23, 2011, 01:34:15 pm »
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Quote:Posted by jrock
Here are my two cents.

The F75 operates at a frequency of 13 kHz, while the Ace 250 operates at 6.5 kHz.  The coil of a metal detector is actually a tuned LC circuit (inductance from the loops of the wire and capacitance from the spaces between the loops of the wire).  Each coil has a resonant frequency where the impedance of the inductance (+jxl) and impedance of the capacitance (-jxc) cancel each other.  The total impedance of the coil is (r+jxl-jxc), therefore when xl equals xc then you are left with only the pure resistance of the coil and you get maximum field strength (max detection depth).  The frequency at which xl equals xc is the resonant frequency.  Which in the case of the F75 is 13 kHz and with the Ace 250 is 6.5 kHz.  Therefore, by replacing a coil with a different resonant frequency then the operating frequency of the detector you will not achieve max field strength and therefore your detection depth will greatly suffer.  Therefore, I would not recommend the switch.  


Wow your Quite a bonus to this forum, WTG Dude

AU

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