for those that use the F70 alot, you ever notice a high tone blip that is loud yet vague at the same time. Kinda like an empty tone

[tony (Orlando FL)]

I have two F70s and both do it. Its not a matter of GB. Its a signal that always ends up being iron yet tries to ID as a high end coin. They are never shallow, usually always at the 7-8 inch depth per the meter. Instead of a solid beep-beep it sounds like a week deep signal based on its tonal quality while it is LOUD in amplitude. This target can be pinpointed, its not a phantom signal, it can be dug but has always been iron, or iron stained soil but never a non ferrous target.

I have dug enough of these to feel really comfortable in ignoring them, yet, I am hoping someone else also has heard these and knows of a way to either tune em out or something.

I have found that when I get these hits, I would take the shovel and sink it into the ground once and if the item disappears, it was iron dissolved in the soil. If the target remains detectable, I will dig it.

 

[tony (Orlando FL)]

n/t

 

[Jackpine Savage]

May be they borrowed some programming from the ID Edge as that one will do the same over iron when cranked up and swinging a bit too fast. What happens when you slow down the sweep and get the target centered better.. does it help to show its iron? Have you tried dropping the sensitivity down just a bit to see if that helps?

Tom

 

[tony (Orlando FL)]

Hi Tom,

Glad you have also heard this sound in the past even though its on a different unit. I had been meaning to record the sound, but that's such a hassle.

I dont run the sens high at all. In other words mine is not set to sizzle as its being swept. I have lowered the sens to approx 20 and it still occurs, PLUS the 'other F70 has a small coil on it too, so thats a major difference. I am using the disc mode, and default speed. My disc is set to at 10, iron can read up to about 15.

Next time I get one of these I have 3 or more ideas to try. One is to go to autotune and see what there is to see, next one is to change tones to see if monotone or infinite variable DP mode tell anything different, and thirdly, try removing ALL disc to see if the iron stuff is simply bleeding through. Lastly, I will try and see if the speed mode makes a difference.

FWIW, from what the manual says, the audio and disc circuits are two separate circuits each getting their input from different portions of the signal. I know its trying to tell me more than JUST DONT DIG , I want to try and figure out more if possible. I get these hits quite often and have been considering leaving em behind because they are so predictable. I actually like the sound, it reminds me of a real deep high coin blip on a cz.

tony

 

[D&P-OR]

Tony----You guys know the F70 a lot better than I do but I've got as suggestion.---Try running your disc right up to 15 (max iron).--If I'm reading you right I'll bet that will "cure" it without affecting performance.---Am I making any sense??-------Del

 

[tony (Orlando FL)]

n/t

 

[Streak!]

thats exactly why I dont like hunting in anything but monotone or 2f. Too many high tone falses................BUT I dont think thats what your describing. Big SOLID iron (like horseshoes) will give you a response that mimics a non ferrous target.....but has kind of a "hollow" sound. The F70 doesnt have a corner on THAT market!!
I've found the same thing on a LOT of units I've used over the years....and your right..the audio characteristics will give the target away 99% of the time. One of the best ways to make the distinction.......is to size the target in PP. Deep big iron will always PP bigger and a bit more "vague" than a nice tight little coin. I ALWAYS dig horse shoes..........................mostly because that despite being certain they ARE horse shoes before digging them.....its just one of those signals you HAVE to get out of the ground...."just in case".
Kinda one of the hazards of the trade. The GOOD thing is that your able to recognize them now....and are able to avoid digging them if you want/need to.
In CW country........its a GOOD thing targets like that sound good. That means more recovered Frags...........cannister shot.......and shells!!!

 

[tony (Orlando FL)]

On my list of things to try is the monotone mode. If I get the blip I am trying to describe in 3and 4f, I have to wonder what monotone will give me. If the same target ends up hiding within monotone, Id kinda rather be able to identify it, I think.

Its just a puzzle for me for now and was wondering if this is also being noticed elsewhere. When I heard this blip of a signal for the first time I would have bet anything it was a deep silver coin NOT anymore though.

I guess I need to get out there NOW to figure it out.

 

[dahut]

... it was annoying, but I liked that machine.