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F-75 at the Club's Fun Hunt

Charlie P. (NY)

New member
I decided to take my four days mine F-75 Club hunt today. She held up her end very well. I set the discrimination to 50, the notch to 33 (high nickels), the mode to default (dE) and the tones to delta pitch (dP). As all targets were shallow I set the sensitivity to 28. The manual states there is a quantum jump in resistive and reactive overload between 0 to 29 and 29 on up. I have no idea what those actually are, but I stayed in the conservative range. I expected the first hunt to be for cents, and it was for "modern" pulltabs, so I should probably have dropped the discrimination, but it seemed to work out OK anyway.

First hunt - pulltabs. One point each, two points for red and five points for blue. I was way back in the pack on the final tally.

Second hunt - cents. Hunt until you find a Canadian cent, then turn it in for a raffle ticket. If your ticket is later pulled from the barrel select one of eight envelopes for a prize. I found my cent almost immediately, but the second raffle number called selected the envelope with "Win All Remaining Prizes" so I got zilch in that event, too. (Even had to turn in the Canadian cent).

Third hunt - Cents stamped with either "X" or "Z" and salted bits of silver on the field, plus numbered copper cent-size tokens. Found 19 X cents, four Z cents, one token and, the best part, a Walking half, Barber quarter, two silver Washington quarters and two Barber dimes. I didn't see anyone else do as well on silver, though one fellow with a MXT got 74 "X" cents! WAY ahead of the rest of us, but he ran to the far end and worked back towards us (I think he had a system worth remembering there :please:). His silver count was five dimes (Rosies & Barbers). Also to his credit, he seems to be a natural when it comes to surface hunting. Fast and no wasted motion (and no bifocals trying to eyeball old cents in the grass. ;-) The coins in the paper mounts are my prizes. The loose silver was found.

Hardly a test of depth, but I was very pleased with the general handling and hunt qualities of the F-75. I did get some deeper hits but we were encouraged not to dig on this outing - surface targets only, please and thank you. One fellow with an older Garrett couldn't get within 15 feet of me or his unit freaked out. I didn't notice any problems at my end; but I gave him wide berth thereafter. Found a couple spots maybe eight feet in diameter where I did get the "Rice Krispies" static that some have mentioned and signals bouncing from low 30's to high 60's. Not sure if it was concentrated trash or other causes, but as soon as I moved on it went back to silent search.

PS - the free rain covers work. We did get sprinkled on at one point.
 
while in disc mode turn the sensitivity down to around, oh, 25 or so... listen closely to it then turn it up to 30, 31, or 32... What I've found is that the TID and Audio get amazingly "calm" when in the 30's. Why? I don't have a clue :) It just does. (around these parts anyway)


Just give it a try and tell me what you think... It sure works great for me!

hh'n

Mark in NC
 
I notice in the specifications they state:

"Reactive Overload: approximately 10,000 micro-cgs units (volume susceptibility) 40,000 micro-cgs units with sensitivity <30.

Resistive Overload: approximately 1,200 micro-cgs units (volume susceptibility) 4,800 micro-cgs units with sensitivity <30."

I don't know a micro-cgs from a chipmunk turd, but obviously there is some significance to the "30" point. . . maybe.
 
With sensitivity at '28' I got some interference (detector still and coil raised), but at '30' the interference disappeared.
 
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