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Metal Detectors
Minelab
MINELAB F1A4 ex military metal detectors - tips, settings, questions
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<blockquote data-quote="Guest" data-source="post: 95263"><p>Frequency being the crystal oscillator on the board itself, Mine is 4mHz, I've seen a couple with 1.9mHz, and even one that was 3.8mhz.. </p><p></p><p>This Crystal has little to no effect on the detectors performance, all it does is effect ground balance, and boot up time.. To modify the 'pulse frequency' you would need to change a capacitor or inductor.. as the frequency is computerised..</p><p></p><p>That 14" mono is a badass coil, I'm running the 14x9 myself, i find it very sensitive (though pin pointing is a bitch)</p><p>The adapter is a good idea, honestly I've tested 6 different DD coils, and honestly the F1A4 doesn't seem to like them, sensitivity is decreased far more than expected..</p><p></p><p>I'm working on a mod currently, got a couple tips from a guy on geotech, to remove the 2 small resistors above the eprom, cutting tracks under them (which i did) pulling them high/low to load different timings.. </p><p></p><p>Anyway enough of my rambling..</p></blockquote><p></p>
[QUOTE="Guest, post: 95263"] Frequency being the crystal oscillator on the board itself, Mine is 4mHz, I've seen a couple with 1.9mHz, and even one that was 3.8mhz.. This Crystal has little to no effect on the detectors performance, all it does is effect ground balance, and boot up time.. To modify the 'pulse frequency' you would need to change a capacitor or inductor.. as the frequency is computerised.. That 14" mono is a badass coil, I'm running the 14x9 myself, i find it very sensitive (though pin pointing is a bitch) The adapter is a good idea, honestly I've tested 6 different DD coils, and honestly the F1A4 doesn't seem to like them, sensitivity is decreased far more than expected.. I'm working on a mod currently, got a couple tips from a guy on geotech, to remove the 2 small resistors above the eprom, cutting tracks under them (which i did) pulling them high/low to load different timings.. Anyway enough of my rambling.. [/QUOTE]
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Metal Detectors
Minelab
MINELAB F1A4 ex military metal detectors - tips, settings, questions
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