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DeepTech

Anyone using the 5.75" uMax coil?

A

Anonymous

Guest
Its been a while since I made a visit to the Tesoro website and I just noticed the Compadre now comes with a 5.75" coil (thats cool!!!) and this coil is also available for the 10-12khz uMax & pre-uMax detectors.
I think this is great news, but I havent seen any posts about this new coil.
I find the 4" too small except for the trashiest of sites (garbage pile, firepits etc) so I usually use my 7" for hunting around old homesteads etc.
The new 5.75" on my old Bandido should work excellent for the nail infested sites that I usually detect. I might have to stick one on my old Amigo II also.
Is anyone using this new coil and what do you think of it?
Thanks and
HH Kevin
 
Kevin, since you frequent Carl's Detector Equipment Forum you have probably concluded that I'm a tad on the fanatical side about testing detectors using coins and rings near and under various size nails, I'll admit it, but since I dig everything above nails in the disc range at older sites I'm looking to get a target average that's in the nonferrous range and not concerned with the masking effect of nonferrous trash. I haven't used the three newest Tesoros but have tested most of the other models with coins near or under one or more rusty square nails. Someone else may get different results than I do in our mild ground but the Tesoro models with 120 degree discrimination were a disappointment, they eliminated nails at zero discrimination and pulled too many coins down into the discriminated out range. None of them could compete with 180 degree models. With a quarter lying on top of the ground and one small, 10 penny size, square nail on top of it the 120 degree detectors would average them and give a signal, bury the quarter/nail or add another small nail and they gave no signal. Put a coin within a couple of inches of a 16 penny size rusty square nail they did the same on most of them, no signal. The LST was better but the best Tesoro I've tried for hunting in ferrous trash was the lowly Compadre, it is the only one of the several Tesoros I've used that could get a coin under a small rusty nail when they were 2 to 3 inches deep in sandy, nonmineralized soil. The Compadre was closer in target separation, and in getting nonferrous targets near or under nails and other small iron, to the GMT 1650 than any of the many other VLF detectors I've tested.
I rambled all over the place just to say that if I were going to use the 5.75 coil on either of the two Tesoros you mentioned I would put it on the Amigo II. It has the same 180 degree circuitry as the Compadre and will outperform the Bandido in ferrous trash, unless the mineralization level where you hunt limits it. If you would like to have the ability to change coils on the Amigo II you can buy a male connector, part numberSL415M, online from Switchcraft. It's not hard to put on and well worth the effort.
JB
 
I have had great success using my Amigo II in the trash and coupling the new 5.75" coil maybe just the answer for the trashier sites.
The Switchcraft connector you mentioned, is it a box mounted connector or an inline one that would go on the coil cable? I have wanted to install a box mounted one for quite a while but never got around to it.
Do you know if there is a GB trimmer inside the Amigo so I could tweak it for the new coil?
Thanx for the interesting post
HH Kevin
 
It's a box mount connector, they also make the female connector and strain relief spring. There's probably a trimmer pot for ground balancing, I haven't seen an Amigo board, but if it runs stable with the 7 inch coil going to the 5.75 shouldn't cause any problems with the GB. Going to a larger coil probably would since it would be looking at more ground.
JB
 
that the GB setting will be good enough.
Stupid question: How do I check the ground balance without an all metal mode?
Thanx for the connector info
HH Kevin
 
In the discrimination mode.....pump the coil at the ground....if you get a sound increase on the UPSTROKE, that indicates a too negative ground balance. Thats the only check on GB I know of in discrimination mode.
 
I have encountered factory preset models with a way too positive GB setting. So positive, in fact, that they would reject a nice, larger silver dollar, and sometimes a silver half-dollar!
Also, some that were so positive that in the Disc. mode they would 'beep' when the coil was bobbed TOWARD the ground!
If presetting a trimmer or adjusting a manual GB for operation in the Disc. mode, I always prefer to bob the coil towards-and-away from the highest mineralized ground around, reduce the GB trimmer/control just to the point it responds on the up-lift, and then slightly increase the GB adjustor <EM>just to the point</EM> where you eliminate the false response on the coil's uplift.
<EM><STRONG>Monte</STRONG></EM>
 
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