Quote:
Originally Posted by J_Player
The preferred frequency is between 40 KHz and 160 kHz because this is a range that has shown the best stray noise immunity for this application in actual field testing. But 455 KHz will also work if necessary.
Best wishes,
J_P
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Low changes you'll obtain at 40 Khz, I try 59.5 because I made a coil center tapped and oscillator. The coil resonate at this frequency with the capacitors I have adjusted at the pF range. Is good, but changes is slow. Found with it a gold button Navy and mark of glasses plated in gold.
At 300 Khz, the detector tend to detect also metalic paper of cigarette box and other "trash". I believe 160 Khz is good. Also Alonso told me this is a good frequency. See the BFO I posted in this thread, frequency is 138-140 kHz.