Menu
What's new
Find's Treasure Forums

Welcome to Find's Treasure Forums, Guests!

You are viewing this forums as a guest which limits you to read only status.

Only registered members may post stories, questions, classifieds, reply to other posts, contact other members using built in messaging and use many other features found on these forums.

Why not register and join us today? It's free! (We don't share your email addresses with anyone.) We keep email addresses of our users to protect them and others from bad people posting things they shouldn't.

Click here to register!

Need Support Help?

Cannot log in?, click here to have new password emailed to you

Changed email? Forgot to update your account with new email address? Need assistance with something else?, click here to go to Find's Support Form and fill out the form.

F75 Sensitivity

S

Sunny Jim

New member
Did some detecting today and had some interesting discoveries. Lots of bullets in a large deadhead on the shore.
Noticed this while trying different settings. I was getting a jumpy report at values of sensitivity below 30. At 30 and above all quiet. Not really in town and not really away from RF noise, especially the CG ships' radar. Cannot find the source but the absence of the ships decreased the noise. All I know is at 30 and greater up to 99 all was very good.
Something interesting at 29 and below; the Sunray Probe was naturally immune due to it's permeable core. Later they seemed to quiet down. Could this be the 'erratics' experienced by new owners? I only turn down the sensitivity on the probe to detect with it or sometimes in Pinpoint. Most times I am working at 99. Still love all metal motion and JE with little or no discrimination. STAT is a wild child for me, more like Pinpoint and not as reliable as all metal. Maybe it is a good verification mode.

Anybody got a clue on the sensitivity thing at 29 and lower?
 
GB seeems critical to me.Though book says in Disc. you can run at preset 90..In all metal it's a must if I am reading right.
Or maybe you were picking up more deep targets that would not Id. Sometimes more sens causing a form of masking.My experience shows that Sens does not have to be up high for good target depths...??????
 
Yes I did ground balance. All observations were made at different locations and all was quiet with the coil on the ground. Elevating the coil increased the jumpiness at all values below 30. had to be some kind of EMI but that does not explain what happens when the settings are 30 or more.
 
interesting observation in that sensitivity does NOT have to be high to get good depth!..what numbers in sensitivity are you referring to when it is set to low sensitivity,and what would be your best answer as to the depth realized at that sensitivity setting?..thanks!..i assume you are in (de) mode?..thanks!

(h.h!)
j.t.
 
Hi JMARYT,
In JE mode.

Sens=29 or less
sens=30 or more :quieting

No depth tests just the observation of the quieting setting.
Was within 100 feet of water and a few miles of high tension lines. Same distance to cell sites.
Lots of DHS/CG activity on the water, in the air, etc. Still, it is not the noise but the quieting point and below that are a curiosity. Need to see what happens in other locations.

SJ
 
Sens 40 and GB fastgrab.....all else as factory preset. The depth is real good..My machine is very quiet running..Not much chater even at higher sens settings..The reason for turn down was it kept hitting deep small pieces of metal at 60 Preset..and by deep I mean 11 or 12 inches and they were measured.
I thought they were phantom targets but kept digging and my digger is 11 3/4/inches long.At or just beyond full length I found the source of target response
 
Machine runs stable and quiet at field, and old farm house sites..At schools some of them it chatters no matter where sens set.Seems like electrical interference..In parks trashy areas it's chattery because it is so fast on recovery you hear just about every target..Lower sens smooths it out and it works very well in heavy trash parks.See my taking F75 for a walk in the park post..
 
yes!..xlt!..it appears lowering sensitivity does a good job quieting it down,however in a park setting ,you say it responds to any kind of metal in the ground because of many targets?..this is adjusted out by lowering the "gain"?..when you do do this.,..ON AVERAGE what is the depth you are realizing on coins when set that way?..you say you got a penny @ 8",however, have you hit other coins while in those reduced settings at THAT depth,or deeper yet?..just curious!..thanks for the input!..great info,and really appreciated!..you are still in (de) mode?

(h.h!)
j.t.
 
thanks!..was hearing je mode is tough to deal with as it is so hot!..apparently it CAN be used with reduced "gain" as long as you can get it stable!..hope to hear more!..thanks for the input!

(h.h!
j.t.
 
I do not think it is a stability issue. What I observed was in JE mode. Settings at 29 and lower allowed the machine to receive external noise when raising the coil above the ground from On the ground. Settings of 30 or greater in Sens. quieted this response. It is some kind of firmware thing that changes how it works at 30 in JE. Do not know about other modes.

As for JE being so hot,.... YES IT IS and I run it at 99 in Sens most of the time, and on the day and in the location I noticed this "firmware" feature. Maybe I needed to GB again at that low setting. Give me a chance to see if I can repeat the results. What I discovered looks like a normal feature that is dependant on your settings and location.

SJ
 
JE mode should out do all modes including all metal for Depth at the lower sense level at a Disc up to 10 for small targets..Dave Johnson Built in a Below 40 sense purpose
into machine..Great test results are proven and talked about over on the Nasa Toms Technical forum..Great Info..read trough the forums over there ..lots of Different subjects talked
about..James
 
It's hard to say how deep some are..Most are 5 to 8 " in this particular area of high trashy area.. Thats 6" coil and once again 45 to 48 sens settings..Hope that helps you.
 
The discriminate rules do not apply to the all metal motion mode.
The extra gain has been factored in:detecting:
 
You must log in or register to reply here.
Top