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Taming the F75 LTD

Southwind

Southwind

Well-known member
I took the F75 LTD to the city park for the first time yesterday and think I need some pointers on taming it down a bit. I was expecting it to be noisy compared to what I'm used to, but it just seemed to beep constantly even when held in the air. Reminds me a lot of EMI I can get on my DFX. I've never had EMI problems in this park area before. I tried turning down the sensitivity to as low as 35 and all it seemed to do was lower the volume of the false'ing. Didn't seem to decrease the amount at all. What Process works best in a trashy old park environment? Lots of trash targets with the goodies at 7" or more.

My buddy had his E-Trac and I tested several targets he had found and determined to be deep coins. I had to scrub the F75's coil on the ground to get a good repeatable signal even with sensitivity at 99 in 6P Process. The target ID was right on though, when it got a signal from the deep target, showing in the 83 range and it turned out to be a 1942 mercury dime at around 8". The dime was a good solid repeatable signal on the E-Trac which also indicated it was probably silver(12-45 12-46).

So far I don't think the F75 is as deep as the E-Trac in this park environment, but time will tell. I plan to take it out to one of the old forts where the F75 shines and see how it does.
 
I have a couple of spots that are almost under power lines and emi at these spots are a severe problem. What has worked for me is to go to the 5" coil, lower sen to about 40 and if necessary, turn disc up to 6. In a trashy environment the 5" coil with a sen setting of 40 is a deadly combo as a 40 setting has a much smaller coil footprint and will unmask some targets that get missed at higher settings. HH jim tn
 
Thanks for posting that Bart!! TONS of great info! :please:
 
Folks does the frequency shifting help in these situations? I tried it today at a place I always have a lot of noise and it seemed to quite it down. It is the first time I tried the shifting thing. Dont know if it was just coincidence or not that it got more manageable. CO
 
From Bart's link, scroll directly to the RED part where it says to point the coil towards the ground, put it in all metal and run through the Frequency settings first ... that one paragraph, in my experience, is the way to go about getting it set up to run quietly. It steps through the methods in order of things that help get quite while maintaining maximum performance and then to the remedies that start to cut down some on performance. I've hit many times where changing the frequency did not make a difference, but if it does then you can still run with some very high sensitivity settings. I have one park that I hunt that I could not get near the concession stand at anything higher than a sensitivity of 10. Was still able to detect and recover coins to 5 or 6 inches deep in a very trashy area. Once they changed out a failing power panel, I could hunt very comfortably with sensitivity set in the 60's in the same area.

I run almost always in bp mode. Frequently when setting the detector down to dig a target, the detector goes from quiet to chattering away with the coil pointing to air. Pick the detector back up and get the coil pointed back to the ground and it quiets. Then move the coil and get repeatable chatter from all the little pieces of conductive material in the ground. After going trough the frequency settings, when you differentiate noise from the air (EMI that is not repeatable in pattern) versus ground chatter (that is repeatable with coil movement) you can also decide if you want to get quieter by raising the discrimination to cut down ground chatter or lowering the sensitivity to get rid of EMI. (EMI is generally not seen as ground radiated unless you are over buried and active wires).
Cheers,
tvr
 
Selecting the 'best' frequency is critical to getting a major depth boost, plus a more stable audio signal, to catch those 'deepies'. You would think that the ever-so slight difference in the frequency bands wouldn't have that much effect. But it does. Adjusting for the best frequency is probably the most overlooked performance boost on Fisher/Teks. Most are too focused on the sensitivity setting........big mistake.
 
Great Point, tell us how you adjust for the DEEPIES, cause I know I can get rid of some ground chatter by CH/FREQ to F7 but what are we looking for for depth or are we we just doing trial an error?
 
Well the F75 was a different character last night. I used some of the advice and started with a Process of DE Discrimination at 5 and Sensitivity at 50. Much smoother and quiet. Still had a lot of ground chatter, but that is just the nature of this 125 year old park. I would switch to JE to check iffy signals and even JE seemed a lot more stable than before. I also hit a tot lot with the F75 last night and was very happy with the results. I didn't really find much but It was a good experience none the less.

Thanks for all the input and links.
 
The E Trac can induce interference into the F75 also.
I hunt in boost mode most of the time with less interface that other modes.
 
Hit some more tot lots today and again the F75 was smooth and stable. I found the normal stuff with the exception of a few deep missed coins. You can see the dark quarter and dime which indicates they have been in the ground for some time. These were missed by previous hunts and were very deep below the tot lot wood chips. I was also very surprised when I got a fairly good signal and kicked the chips to find this very small chain. I had to double check and sure enough the F75 give a good solid signal on the small chain.

5142011.jpg
 
Don't be surprised with the small chain. Unless you discriminate it out, the F75 will find very very tiny pieces of metal, all contributing to the ground chatter until they have been removed. I've found some trashy areas that I can pick through targets better in all metal and watch the meter for non-iron indications. For me it can be easier to listen to than in the discrimination modes in some of the very chatty areas. May not be how others choose to hunt though.
 
try the all metal motion mode, its deeper than the disc modes and has a better feel to it, with a constant threshold its a little more like your etrac.
the freq selection was a big one for me, really helped me on my F75 and power lines. take the time to learn it.
 
I hunt the same way tvr.When the going gets tough I will switch to all metals,do a freq. check and crank the sens. up abit,and watch the tid for iron falseing.It seems easyer on my brain to decipher all the machine is telling me,although I tend to rely on the tid more which at times I have found myself tangled up in overhead branches!!!! JMHO.....hh rick in mi.
 
This is a helpfull thread. I was having this chatter problem with my ltd/se in my yard because of the power lines. From my research the etrac is a little better at coin depth than the ltd. Last weekend I pulled a fired 3 ringer 16 inches out of the ground. I should have took a pic of this crater I dug.
 
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