A lil' BH/FT/Fisher Air Test Compendium

[BarnacleBill]

Test Conditions

1. 25ft from house.
2. No overhead or buried power lines.
3. Detectors 3 ft above the ground with coils 90 degrees to the ground.
4. Stock concentric coils on all detectors.
5. No Cell/Portable phones or electronics nearby.
6. No large or buried metallic objects nearby.
7. ID needed to be correct to be considered a valid response.

F70 became chirpy at 80% sensitivity setting. The Hz(Frequency Offset) was cycled through and had no effect on the chirpies. Higher sensitivity led to "Cat with tail stuck in screen door" behavior.

[attachment 118444 FTFisherAirT.gif]

HH
BarnacleBill

 

[Elton]

Not a large difference between machines, but a difference that sometimes finds older targets.

I wonder how much depth difference in the ground there actually is on machines. ( Not as much as we would like to think)

 

[Phil]

gave a good dig me signal on a penny 8in in the ground with the coil 2in above the ground. it gave a good signal on a nickel at 12in in an air test. That was with the nickel laying on top of the ground. I've never tested the stock coil cause I rarely have it on. I use my F70 for field hunting and don't really pay attention to the VDI numbers cause I dig most positive signals in the crop fields. I don't really pay much attention to VDI numbers unless I'm clad hunting for battery money.

 

[Merf]

Thanks for the test results Bill, I wonder what the test results would be if you counted the signals without correct ID.
I dig any signal that sounds good in the fields so my F-70 should do quite well this year.
I have been using beep and dig detectors for a while and recently got the F70 and a Pioneer 505 with the 4 inch coil for hunting in the nails. Best luck, Merf

 

[Ron from Michigan]

Bill interesting.Thanks

 

[Merf]

Bill, My curiosity got the best of me so I tried to simulate your test in my basement.
F70 laying across styrofoam cooler 13" off the floor and 4 feet from basement wall.
Metal on three sides 7 to 8 feet away. Florescent lights overhead 10 feet away.
In DE mode, sens 80, threshold zero, and zero discrimination.
With repeatable correct ID I got.

Nickel = 9"

Dime =9 1/2"

Quarter = 11"

In SL mode the detector was unstable at sens 80
This is what I got with sensitivity set at 70 and 0 threshold.
Repeatable correct ID

Nickel= 9"

Dime= 10"

Quarter=12"


I guess no two detectors are exactly the same. Is your F-70 the updated one?

Merf

 

[BarnacleBill]

It is a two block Left+Right & passes the while standing on one foot with the coil pointed towards Mars, zero Disc On/Off nail test.

HH
BarnacleBill

 

[John 'n' W.Va]

Interesting test. I know that the F-70 will quiet down when you put the coil to the ground.

When I was MD'ing that roadside park the other day I had the sen. 80, thres. +5, ground 80 and dirt was one to two bars. I switched to slow and it still ran smooth. It beeped a lot, but it was picking up stuff. I just had to go slow.

Every 2 to 3 trips MD'ing I have to reset it when it starts going crazy. It than calms down and I run it at the above settings. Except the one setting I adj. the most is the threshold. Mainly around "o".

 

[Jackpine Savage]

the brush with his tracking collar sending out a steady stream of MUF!

 

[Merf]

It is a two block Left+Right & passes the while standing on one foot with the coil pointed towards Mars, zero Disc On/Off nail test.

HH
BarnacleBill

Bill=====Put the bottle down.

 

[BuckeyeBrad]

something with a big rack sending out a steady stream of MUF is a bad thing?

 

[Uncle Willy]

Yeah there isn't really that much difference unless you're running in all metal and there are so many variables that determine depth, especially coil size ( the biggest determiner of depth ) which few ever mention in their tests. Did these two machines have the same size and type of coils?.

Bill

 

[Merf]

I was using the stock 10" eliptical coil and assumed Bill was using the same.

 

[Jackpine Savage]

Sophia busting thru the woods again and not Bullwinkle??

signed: confused in NWMI

 

[BarnacleBill]

Yep, item # 4. Stock concentric coils on all detectors. They're all in the 8-9 inch range except the F70 is an elliptical. But if you squished it back into a circle it's about the same size.

HH
BarnacleBill

 

[BuckeyeBrad]

my vision is so trashed from all the mercury laden fish I eat and I just couldn't see well enough. Of course it was almost dark out, and no, I wasn't poaching, I just had a moment there when I forgot where I lived. I do know that Sophia is the one that runs slower, jiggles more, and smells better. I'm confused too.....
signed,
Putz in NWOH

 

[Bill Ladd]

Built to last, & made in the good ol USA too.........

 

[michaelnc]

I just had to make a comment on this post. I totally agree the Edge has the Edge. I owned an F70 and it was a chatterbox but it was fast at recovering between targets. The Edge and Excel units are probably some of the most underrated units you can buy. I like it better than the CZ's (similar depth, faster recovery) and its much more stable than the F series detectors. I actually like the F5 over the F70. Its just as deep if not deeper on higher conductive targets like silver and copper which makes it an excellent coinshooter. Just my two cents.