Check this out...I have been using this at some severe trashy areas because I am too lazy to change the coil to a sniper and I am plucking some very nice coins out of total trash pits this way using the 11" DD coil.
This is with the F70 but I assume it will work the same on the F75.
Both of these things are just superpowered out of the factory so unless you are looking for crazy deep targets, (something I rarely do in trash heaps), try it and see what happens.
Keep in mind my soil is close to perfect, I GB in the low 40's to the mid 50's most of the time and usually only 1 bar on the dirt meter, if that, so adjust accordingly for your soil conditions.
I recently picked up a dime at a measured 5" on a sense setting of 19.
At 30 sense I gained 2 inches, at 40 sense 2 more inches.
Disc was at 4 but in really trashy areas I usually raise it to 23 to get rid of most small foil and those stupid foil bottle cap inserts and at these settings there seemed to be no change in depth using either range of disc.
Remember your unit will get a slight boost at disc settings below 5 and past 20 and a bit more noise might come in, or maybe not...all sites are different.
On this dime thresh at 0 or -1 could still pick up the dime, at -2 it was gone.
Once I got below 23 on the sense the tone still was solid and repeated but it changed into something else, like half the tonal qualities went away.
By switching from DE to SL, (boost on the F75), all tone qualities came back and were full and solid again and if you ever did this using the F75 you have tone adjust which could be an extra added and nice feature in this case.
Usually switching to SL on mine at much higher settings I get way more noise...at these settings, even in SL, I was totally silent.
That is just to give you an idea on how powerful these things really are so you can turn them down with confidence and maybe still get the targets you want at depths you want to reach without higher crazy noisy settings.
The setting YOU might want to try using the 11" DD are these which are turning out to be very comfortable and confident settings for me looking for great targets in the trashiest sites even with crazy high EMI.
Sense at 30
Thresh somewhere between -1 and 1...higher if possible with no extra noise.
disc at whatever you want but in those heavy foil sites the mid 20's somewhere...get too much past the high 20's and you could knock out nickels and maybe some pretty nice size gold.
Any disc past low iron you could knock out silver chains, small gold chains, smaller gold rings too, but you will have much less noise and less signals the higher you turn up the disc.
Speed on DE, boost if it stays quiet.
Notch I always keep at 1.
Tones, your choice, but I like 4H to make those nickel/gold signals stand out.
2F is rumored to be one of the best and quietest around heavy EMI, but at these ultra low settings you shouldn't be bothered by that too much.
The key to this 30 sense setting is it seems to have the effect of actually reducing that large scanning field to a very precise, surgical type instrument.
Not sure exactly what happens here, but it is almost like my coil went from that big DD to a sniper size coil.
At this point just move that coil slow and listen and watch the screen.
You will still be hit with many, many signals, but they will be real signals of all the trash you did not disc out and all the good numbers and tones of the best targets should show up too if you stay alert.
Using this method at the busy entrance of a very popular over 100 year old park, and when I say severe amount of trash this is a textbook case, and also with a stupid crazy amount of EMI due to a power line and several homes with wifi just across the street and who knows what else, my F70 was still ultra quiet with only a few false signals here and there...something I have just learned to recognize and ignore.
In this site utilizing these settings I have still been able to easily and effortlessly pick out several zinc cents, copper cents, 2 nickels, a few dimes and one very nice Merc that I believe was actually standing vertical in the soil about 4-5" deep...all while digging very little trash.
There are a ton of new and old pop tops here as well, but they are usually a little jumpy and even the ones that aren't by rimming the front edge of the coil over these those targets usually drop to low numbers, into iron at 11 lots of the time, so you can tell what these are about 98% of the time.
I have found on a large amount of irregular shaped trash, and most poptops that are not laying horizontal in the soil, the numbers will jump 3 or more no matter how I maneuver that coil around or over them...and believe me I really try.
Your choice, but in my case I have a rule that I rarly dig anything that jumps more than 2 numbers and that is a rule works for me.
All targets, trash areas or not, are dug if they have a solid tone and the numbers don't jump more than 2...I have been a gold hunter a long time and they always came in solid using my 2 number jump on shallow targets.
I have used these same settings at other trashy picnic pavilion sites and they worked just the same.
I am also using maxed out settings at disc and in all metal and I am practicing my ability to pick out the good targets that way but I have a lot of experience with some very noisy units in the past and it isn't all that hard for me and I am getting better with practice.
With powerful units like these, start out with low settings and gradually move up into the higher ranges as you get more comfortable..a much easier way to learn.
I don't care how long you have driven, get into a race car with far more power than you are used to and such different handling characteristics you would be lucky not to crash into a wall with little or no experience, and you would be noway close to a pro in expertise.
Try the lower settings and see how you do.
