Monolithic Shielding

[Clad2Hunt]

I have this on my Tesoro 8" brown coil and I can't seem to find a clear explanation of what it means? Any Ideas?

 

[Clad2Hunt]

Stunned no one could answer this. Finally found the coil is made of carbon fiber which makes it stronger. Have a coil cover for it but looks like I didnt need it.

 

[Monte]

introduced their first brown ABS plastic control housing to replace the metal housing. Metal control housings can help block or impede outside EMI. When plastic is used it wasn't uncommon to see manufacturers use some sort of metal film placed inside a detector design to help protect some of the circuit board from EMI (electromagnetic interference). Shielding is important to help keep a detector operating smooth and stable.

In a March 18, 1991 Tesoro Dealer Newsletter, Tesoro described their new feature as this:

"Monolithically shielded searchcoils and control housings- an industry first from Tesoro! The shielding is a homogeneous part of the plastic, providing continuous control over external interference."

So, rather than rely on a metal control housing, or using a "paint' inside the coil that helps shield it from outside EMI, Tesoro simply used a a new blend of shielding in the ABS plastic they employ in the control housing and search coil (or at least on some of the search coils ... namely the brown one,

So, it was simply a form of electronic shielding. There are a number of approaches that can be used to shield a search coil from outside interference and this one worked for Tesoro when they introduced that brown 8" coil. Personally, I favor the thinner and lighter white 8" open-center it replaced.

Finally found the coil is made of carbon fiber which makes it stronger. Have a coil cover for it but looks like I didnt need it.

You don't need a coil cover regardless of the coil you're using. Now, I will usually use on on the 8X9 or other epoxy-filled Tesoro coils simply because the bottoms can have a sharp edge where they are filled and the cover can prevent some chipping or other damage. As for wearing out a coil, it's just not going to happen, or it shouldn't, because unlike the early days of TR and TR-Disc. operating that promoted a "scrubbing technique," detector manuals suggest the search coil be worked from