An Explaination of F-75 Settings at iron laden old house sites-2F, etc...?

[christopher-ohio]

I just want to really understand what I'm reading from the most experienced F-75 users at these kind of sites. I see many are using 2F so iron is a low grunt, and anything else is a higher tone. How do you decide to dig a target-VDI and depth? I would really apppreciate a detailed settings run-down for an F-75 at this kind of site- 2F plus a disc at 6...etc...does that mean one is using DE or PF, with the disc at 6...coming from a CZ, it seems a bit confusing...any insight would be most appeciated!

 

[BEAR]

I would run it in the DE mode. Dis. set at 6 to get rid of the nails and still get the big iron. 2 tones and the sen. as high as not to let the machine get out of hand. It will not have to be high as at a old house place the targets should not be all that deep. If you have alot of modern trash I would just look for the good 50 and up signals. If you are not digging alot of trash you can dig targets down into the 20's to get the older nickles.

 

[Low-Boy/LCPM]

[size=medium]This was written by Nasa Tom...[/size]

know that I answered this in several threads and in several posts below......... but let me see if I can say it a little bit differently.

Say; you have a silver dime and a nail at a handful of inches deep. The two targets are close enough to each other.... and laying in such a fashion so as to give you a VDI ID of...say; '13'. Let's say your F-75 Discrimination is on a setting of '6'.

1. If you are in '1' tone (monotone).... the F-75 will give you a good audio response to the target. (((You will most probably recover the target))).

2. Say the F-75 is in 2-tone (or 3, 3H, 4, 4H tone options etc.....). Now......... the F-75 will respond with a audio response that most detectorists will NOT dig/recover. The F-75 will report a 'iron' tone (the lowest sounding audio tone). The non-ferrous silver target will most likely NOT be recovered....... even though most all nails will discriminate out at a Disc setting of '6'.

THIS IS BECAUSE; When 2-tone (or 3, 3H, 4, 4H etc.....) is selected = ANY target that results in a VDI ID reading of '15' or below....will report as a 'iron' low-tone. Most folks will NOT recover iron tones.
I have explained this many times.... in many posts below; Sooooooooooo ,,, if my explanation is not clear enough here.... I may have done a better job in posts below.


NOW.......... that being said. (((( If you are in a nail infested area, and you do not audibly fatigue easily = = = )))) IF, IF, IF, you can handle a lot of noise.... and the detector can handle (not EMI plagued) a Disc setting of '0' and a Sens setting of '99'....then hunt in 2, 3, 4 tones (your choice),,, hunting for the "deepies". YES.....the detector will mask some targets in this audio selection config (ie 2, 3, 4 tones are selected) because any (heavily masked) target that VDI ID's as a '15' or below will present a 'iron' audio response (as so stated in example above),,,,, BUT, BUT, BUT the trade-off is; the F-75 will go deeper just by virtue of the Disc setting being '4' or below (especially '0').

Soooooooo, I am saying (by this set-up config) = MORE MASKING, BUT GREATER DEPTH. Hmmmmmmmm... trade-off. Which one does better? Disc '6' & monotone???? or Disc '0' and multi-tone???? The answer is: They BOTH do!!!!!!!!!
I am saying; HUNT the area in Disc '6' & monotone...... and do all the 'unmasking' that you can. THEN hunt in Disc '0' and a tone-option of your choice.... going for all the deepies.
NO...... you can not have both at the same time.... (((unless you're really good!!!))).

* 99% of EMI enters thru the coil. ((( Control box is not shielded....but is usually not the 'cause' ))) Dave J. & John G. are well-aware of the EMI issues, and understand the magnitude, the level of difficulties to mitigate this inherent single freq .... high powered unit's issue. And in the F-75's design..... there is minimum component-to-component 'cross-talk'.

* You have NO idea how difficult it is to design a 'functioning' detector. There are THOUSANDS of issues to deal with.... most interact/play AGAINST each other. There are MANY things we do not think of..... MANY things we are COMPLETELY unaware of.... that are 'exposed' in the design phase; MANY things rear it's ugly head! How do you know what you are missing...... if you don't know it even exists!!! Why would a rusty nail ID as a '4' at just a few inches..... yet.... STILL ID as a '4' at MUCH GREATER depths!!! And how DO you reduce internal component cross-talk!!! Which specific components are 'show-stoppers'!!! And just exactly what SPECIFIC.... and how MUCH shield paint must be applied to the coil !!! What are the thermal characteristiscs of each electronic component.... and how solid/stable/repeatable/reliable is each component as they change throughout operating temp changes!!! What material should be used for the face-plate film so as to mitigate UV breakdown!!! Pistol-grip foam density..... coil wire gauge so as to provide proper impedence; yet NOT change impedence AND NOT BREAK whilst donning/doffing coil thousands of times. THE LIST IS MILES LONG!
It's not easy guys..... it's not easy! The CZ took over 4 years in design... and Dave Johnson was NOT ready for release/product roll-out.... but was hand-cuffed by corporate deadlines & finances.

I could only... AND CAN NEVER commend enough!!!!.... folks like Dave Johnson, John Gardenier, ..........Bruce Candy, George Payne, Kenny White, Charlie Garrett, Eric Foster, Jack Gifford and other DE's of the detectors we live by. We take it for granted... and DO NOT know it!

Tom

 

[RonNH]

n/t

 

[Daniel Tn]

Now that explains a lot of what I've been finding out for myself...just in a technical form. In my non technical form of things I've found myself by going back to sites I had previously hunted in Disc 10 and 2F mode...and found lots of stuff I missed by hunting with 0 disc and or all metal. That's what I've been trying to explain a little here and there but his post explains it all.

 

[Streak!]

I knew the benifits of monotone and O disc...but spent a LOT of time testing O disc and 2F.........and found there are BIG benifits to O disc in monotone AND 2F....if you dont like having to have to watch the screen constantly.
I got good targets in 2F and O disc you couldnt hear at all in 2F with a disc of only 6! AND they ID'd fairly well! The benifits of O disk are huge...AND verifiable. Its worth trying in heavily "pounded out" sites. Streak!

 

[Streak!]

something about hunting in O disc actually improves separation as well. Its a big boon in cellarholes. Streak!

 

[RonNH]

n/t

 

[liquid1]

great info..

 

[Cal_Cobra]

"I am saying; HUNT the area in Disc '6' & monotone...... and do all the 'unmasking' that you can. THEN hunt in Disc '0' and a tone-option of your choice.... going for all the deepies."

I assume the settings and operation would be the same (with similar searching results) on the F70 ?

 

[daryllpugh]

After you've hunted hard in the disc. mode I suggest going over it again in the all metal. A lot of guys are missing targets from the disc. mode even if you're using the 2tone and 0 disc. This is true for highly mineralized soil. Try it and dig all targets after a while of practice you'll really appreciate the power of the F-75. It's truly the best machine out there. The all metal mode identifies targets more accurately than disc. Pay attention to the display and numbers. Soon you'll never want to use disc. I hunt in all metal with the sensitivety on 90. The machine is noisy with this setting. But once you learn what to listen for it's really easy to use this way. I've dug clad in the worst can infested areas with the all metal setting and these were at a shallow depth. In this same area I've dug civil war bullets deep some up to 16" bellow the trash line. At old house sites. Targets usally are shallow. But I've found better targets down below the trash in these areas and if you use disc. you'll miss these targets using disc. Good luck and keep on diggin!!!!!