F75 LTD Has anyone tried the 10" concentric coil on this badboy yet?

[Frank in NH]

Some told me the concentric coil should go deeper then the 11"DD, looking for opinion on this.

 

[D&P-OR]

Frank-----I have been wondering the same thing (concentric coil on the "bad boy").---Don't know about it getting as good as depth but seems like it would help in certain hunt situations.---Be REALLY interesting to hear somebody's report that has both those coils & tests them.-------Del

 

[Bill Ladd]

I was always kinda told/ or assumed that in theory the concentric should be deeper & that's why I got one for my old F75....
But, the few times I used it after I "hunted out" some places, it was unable to nail anything further, so if it is any deeper I have not been able to 100% determine that yet. But, I'll put it on a lower rod & try it next time out.....may have helped me in the cornfield today actually..........
HH,
Bill

 

[John(Tx)]

on my F70 because I read on these forums that the 11" will go deeper and actually work better on my F70 than the stock 10" concentric. Now I'm confused. Anyone used both on their F70 that may be able to comment on this? Thanks and HH

 

[D&P-OR]

John-----I used both those coils (11" DD & 10" concentric) on my F-70 when I had it.---In my ground (which for the most part is heavily mineralized), the 11" DD DEFINITELY went deeper.---The biggest "problem" I had with the 11" DD on my F-70 was steel bottle caps.---I'm sure that someone that uses the 10" conc. in milder ground than what I have would get better results (depth) with it.----Haveing said all that, I'd STILL like to see the results somebody gets compareing those 2 coils on the LTD with it's 2 new modes.-------Del

 

[jimmyk]

I have both machines and tried the 11" DD coil on my F 70 in my test garden. Was definitely deeper. Would go nearly as deep as the F 75 with the 11" coil. Never used it in the field, though, so take it for what it's worth.

jimmyk in Missouri

 

[Mr.Bill]

The DD, ( Wide Scan ) coil was designed to help cancel the affects of mineralized ground. The more heavy the ground is mineralized, the better the DD will perform. They do have a few drawbacks. There is always a trade off factor to deal with. With the DD coil some notable negatives are poorer discrimination, most noticeable when dealing with rusty bottle caps. A loss of sensitivity over the concentric. Poorer results in salt ground like a beach, and more difficult to pin point with.

Now it sounds like there are a lot of things wrong with using a DD coil, but it

 

[John(Tx)]

the ground here on the Texas Gulf Coast is very mild, glad I didn't spend the bucks on the 11" DD. HH

 

[Greg (E.Tn)]

How's that for an answer?

Someone may well correct me if I'm wrong on this, bue I alway thought that where Concentric coils go, the deeper the signal, the smaller the area scanned, like a cone.

For example, w/ a 10" concentric coil at 7" you might only be convering an area 2" in diameter, and that could vary due to soil conditions.. Does that make sense?

Hence the HUGE cncentric coils on the market today--not just for depth, but to enlage the detected area at depth.

Again, I may be completely off the wall on this, and if so I apologize.

 

[Frank in NH]

Does anyone know?

 

[go-rebels]

How's that for an answer?

Someone may well correct me if I'm wrong on this, bue I alway thought that where Concentric coils go, the deeper the signal, the smaller the area scanned, like a cone.

For example, w/ a 10" concentric coil at 7" you might only be convering an area 2" in diameter, and that could vary due to soil conditions.. Does that make sense?

Hence the HUGE cncentric coils on the market today--not just for depth, but to enlage the detected area at depth.

Again, I may be completely off the wall on this, and if so I apologize.

Remember that at depth the cone of a concentric search coil beam will be quite small, so that at the maximum depth the tip of the cone may go deeper than a similarly sized DD but be much smaller in area. At the limit of a DD detection depth the area of detection may be greater than the area under a similarly sized concentric coil due to the oval pattern.

The giant concentric makes a giant cone thus the tip can drive a little further into the ground. I wonder if Fisher will ever make a giant DD? But that would ruin the balance of the F75.