F-2 Impressed......

[Jeff Beecham]

I agree.... The Advantage and the 7.25" DD coil combo has always been one of my favorites for searching
trashy, old home sites.. Great separation and depth.....

 

[Cal_Cobra]

I've only had my F4 out to hunt twice, so I'm by no means an expert, but so far I'm really impressed by it for a turf hunter. The DD coil is a coin rake, and you can cover a lot of ground with it quickly. The only con on the DD that I can see is pinpointing is a bit funky. What I've been doing is trying to hit the target with the toe of the DD while doing a 360 around it to narrow it down (without using the pinpointing button) and that seems to work about 80% of the time. Does anyone have a better way to pinpoint with the DD ? There's a small circle impressed on the center top of the coil, is that the "sweet" spot if using the PP button ?

Thanks,
Brian

 

[Charlie P. (NY)]

Couple ways.

Always re-sweep at least three coil widths over a target signal. As you re-sweep in the same back and forth path keep an eye on the soil for any feature under the coil center rib as it passes the 'beep". A clover leaf, blade of grass, etc. Then sweep in an "X" repeating it. if the "beep" occurs higher, lower, before or after adjust your focus point. This sounds harder than it is to do (especially with an open skeleton/spider/dead flounder coil).

Second method, as you noted, is to again sweep three coil widths and slowly pull the coil back towards you. At the point the "beep" does not occur at the sweep center the target is right in front of the very tip of the coil (but you have to still keep that mental image of the center as you sweep).

Think of a DoubleD coil as a paint roller held vertically. It "paints" a long narrow field. By triangulating the field at different angles you can isolate the target to the intersection.

A further refinement is to repeat the "X" while lifting the coil gradually and you can determine depth and, in some cases, target ID based on the reaction.

There is also the trigger pinpoint (I don't know from the F-2 but I am assuming). That shrinks the field and allows you to home in on the target.

My Minelab Musketeer is a DoubleD and I'm so used to the characteriatics I hardly bother with the pinpoint.

 

[Charlie P. (NY)]

Note that with a DoubleD coil a surface coin (one) may give three signals! Center & each edge of the windings.

Lift the coil 5" and you'll be back to getting rapid individual hits (Though I don't have a F-2, but that is a general truth).

 

[Cal_Cobra]

Hi Charlie,

Great tips, thank you. So far the triangulation method seems to work the best. The trigger pinpointing didn't work that well for me, but I'll admit I need further practice with it. It has a two digit LCD meter whereas the closer you get it to zero on the meter, that's the pinpoint. I'm just not positive what section of the coil it pinpoints to yet (seemed to move around a bit).

I've noticed exactly what your saying on a surface coins, I also saw that when doing airtests, unless you move the coil quickly. That's a good tip to lift the coil, I'll give that a short.

There's a little park by my house that's loaded with modern clad, nothing old, but it's a good test bed to clean out