Byron (TX)
Member
I've been using an older model F75 with the stock 11" DD coil extensilvely for about a year. Really great machine, found a lot of cool stuff with it. But the steel crown bottle cap that will stick to magnets will fool this detector every time. I cannot disc them out, seems like these would ID very low in the iron range below 10 on the target ID, but in 4H mode I get an eratic bouncing tone and the ID number jumps from the 70's to 90's and won't lock on. The aluminum bottle caps lock onto a number usually in the 50's or 60's with a mid tone or high tone. I hunt a wide variety of sites, most are older demoltion sites with loads of metal trash, but many good targets too. Also have the same problems on steel washers. Some of these sites are wall to wall junk metal, but also have a few old relics and coins there too. Most are shallow, less than 5" deep.
Discussed this with Mike at Fisher tech support, he said concetric coil would do better on at the trashy sites.
I'm thinking about either buying the 6" eliptical concentric coil, or the 5" DD coil. Which small coils are y'all using with the F75. Does this disc out the steel bottle caps better? I've got a few old demos sites that used to be bars and fairgrounds that are practically plated in bottle caps. I'm sure there's a lot of good stuff hiding amongst the trash.
Also have not got any gold jewelry yet with the F75, I hunt in very low disc, and lower the sensitivy to calm the chatter.
Discussed this with Mike at Fisher tech support, he said concetric coil would do better on at the trashy sites.
I'm thinking about either buying the 6" eliptical concentric coil, or the 5" DD coil. Which small coils are y'all using with the F75. Does this disc out the steel bottle caps better? I've got a few old demos sites that used to be bars and fairgrounds that are practically plated in bottle caps. I'm sure there's a lot of good stuff hiding amongst the trash.
Also have not got any gold jewelry yet with the F75, I hunt in very low disc, and lower the sensitivy to calm the chatter.