William Monday
Jr. Member
- Jul 19, 2014
- 23
- 6
- Primary Interest:
- All Treasure Hunting
The "Lady Shadow" ran at 9.6 khz, according to Tesoro, and a sticker/label was included in the box that could be applied, if the buyer chose to apply it, to tell it from the 10 khz Shadow. If one doesn't have the sticker, probably the only way to tell the difference would be to use a scope. As for the same coil working on Tesoro detectors that ranged from the 9.6 khz Shadow to the 15 khz Golden Sabre while Whites, Garrett and Fisher detectors could only use coils with less than a .5 khz difference, I asked Jack Gifford that question back in 1997 or 98. Whether his response was accurate or not I have no idea, but he said they used a variable oscillator, he called it a rolling oscillator, and the coil was part of the circuitry that determined the final frequency. That not only allowed the same coils to be used on a wider range of frequencies it allowed a wider tolerance range when making them . If that was true, it not only means a 10 khz Tesoro isn't exactly 10 khz, it's likely why Tesoro's rarely have interference issues with other Tesoro's with the same stated frequency.
