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Boost Process once engaged transfers over to All Metal mode, so you want to set up Boost Process in disc mode first, then switch to all metal. I confirmed this myself directly with Dave Johnson. As far as which is better that just depends on how much target analysis you want to engage in. All metal makes you engage more fully with each target and if targets are thick can lead to "analysis paralysis". In such cases the appropriate disc mode may be more efficient.

I assume you are aware of the issue regarding the factory preset ferrous break for the tone disc modes? This forced me to use either single tone with it's fully adjustable ferrous setting or all metal and watch the id numbers. I preferred all metal as it does much better at picking up fringe targets but again it depends on the person and situation.

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31 minutes ago, Steve Herschbach said:

Boost Process once engaged transfers over to All Metal mode, so you want to set up Boost Process in disc mode first, then switch to all metal. I confirmed this myself directly with Dave Johnson. As far as which is better that just depends on how much target analysis you want to engage in. All metal makes you engage more fully with each target and if targets are thick can lead to "analysis paralysis". In such cases the appropriate disc mode may be more efficient.

I assume you are aware of the issue regarding the factory preset ferrous break for the tone disc modes? This forced me to use either single tone with it's fully adjustable ferrous setting or all metal and watch the id numbers. I preferred all metal as it does much better at picking up fringe targets but again it depends on the person and situation.

I’ve never used all metal mode, so would the tones be set on disc mode? What in disc mode has to be set up for all metal? I guess if you were hunting for civil war relics in a field what settings on disc mode, and then switching over to all metal what would you do? I’ve always had awesome luck just with DE mode cause it’s still super deep, I understand the ferrous situation, because in some instances when detecting some other sites, some of the bullets I found rang in like a ferrous signal mixed with non-ferrous. It began to get annoying, because I was worried I was missing stuff. I usually kept my disc at 6, and 2F. I did great that way, but even having the new model F75 still has that ferrous issue, where some items shouldn’t sound like crap or have an iron tone along with the higher VDI numbers. I’ve noticed even coin hunting in trashy yards of 1800’s houses if you use disc even in the 20’s, sens at 75-80, it gets so noisey

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All metal is a totally separate mode with no tones so it does not matter what the disc settings are once you switch to all metal. Just engage Boost Process in Disc Mode, then switch over to all metal. From the manual:

"To change between an All Metal Mode and Discrimination Mode, the top line of the menu system must be highlighted. Press the MENU button until the top line of the menu is highlighted. When either All Metal or Discrimination is highlighted, rotate the SETTINGS knob to move between the two categories."

You will find all metal to be smoother operating than the disc modes, another reason I preferred it personally.

If you are using 2F then your disc setting of 6 eliminates readings of 6 and under, but the tone break is set between 15 and 16 so you will get a low tone on targets from 6 - 15. The problem being fringe non-ferrous targets in difficult soil easily read down to about 6. So do you dig the low tones or don't you? That is the question with the F75 in any tone setting. They really need an adjustable ferrous tone break on the machine and unfortunately Dave Johnson told me it is not possible for some reason. The hard 15 break in coded in at a very low level. I ended up preferring the Gold Bug Pro/F19 for my purposes purely over the ferrous tone break being adjustable on those machines and the 19 kHz being less prone to calling non-ferrous targets as ferrous in bad ground.

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1 hour ago, Steve Herschbach said:

All metal is a totally separate mode with no tones so it does not matter what the disc settings are once you switch to all metal. Just engage Boost Process in Disc Mode, then switch over to all metal. From the manual:

"To change between an All Metal Mode and Discrimination Mode, the top line of the menu system must be highlighted. Press the MENU button until the top line of the menu is highlighted. When either All Metal or Discrimination is highlighted, rotate the SETTINGS knob to move between the two categories."

You will find all metal to be smoother operating than the disc modes, another reason I preferred it personally.

If you are using 2F then your disc setting of 6 eliminates readings of 6 and under, but the tone break is set between 15 and 16 so you will get a low tone on targets from 6 - 15. The problem being fringe non-ferrous targets in difficult soil easily read down to about 6. So do you dig the low tones or don't you? That is the question with the F75 in any tone setting. They really need an adjustable ferrous tone break on the machine and unfortunately Dave Johnson told me it is not possible for some reason. The hard 15 break in coded in at a very low level. I ended up preferring the Gold Bug Pro/F19 for my purposes purely over the ferrous tone break being adjustable on those machines and the 19 kHz being less prone to calling non-ferrous targets as ferrous in bad ground.

I do dig quite a bit, but I dig a lot of iffy signals. If I don’t hear a squeak in the grunt then or if it’s not repeatable I leave it. Being disc at 6 you think it would be low enough to cut out nails, small wire. Monotone would probably be best in this situation, and just go off the numbers, and whether it was repeatable and stable.

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On 12/16/2019 at 1:32 PM, Steve Herschbach said:

All metal is a totally separate mode with no tones so it does not matter what the disc settings are once you switch to all metal. Just engage Boost Process in Disc Mode, then switch over to all metal. From the manual:

"To change between an All Metal Mode and Discrimination Mode, the top line of the menu system must be highlighted. Press the MENU button until the top line of the menu is highlighted. When either All Metal or Discrimination is highlighted, rotate the SETTINGS knob to move between the two categories."

You will find all metal to be smoother operating than the disc modes, another reason I preferred it personally.

If you are using 2F then your disc setting of 6 eliminates readings of 6 and under, but the tone break is set between 15 and 16 so you will get a low tone on targets from 6 - 15. The problem being fringe non-ferrous targets in difficult soil easily read down to about 6. So do you dig the low tones or don't you? That is the question with the F75 in any tone setting. They really need an adjustable ferrous tone break on the machine and unfortunately Dave Johnson told me it is not possible for some reason. The hard 15 break in coded in at a very low level. I ended up preferring the Gold Bug Pro/F19 for my purposes purely over the ferrous tone break being adjustable on those machines and the 19 kHz being less prone to calling non-ferrous targets as ferrous in bad ground.

I’m also confused on the DST on/off. Some say one thing, and another person says something different. I’m going tomorrow to that major Civil War relic hunt, and I want the machine to be at its best for depth, and target separation. I had planned on going all metal, will that change the VDI numbers any or will they still stay the same, as say I know what a bullet rings at as, would it change anything on that end or stay the same?

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It does not matter what people say. The detector in your hands is the only thing you should listen to. When you get where you are going, locate a target in the ground, and switch back and forth and play with the target to determine what setting you want to go with.

DST is a noise filter, nothing more, nothing less. If you have too much EMI noise employing it makes signals clearer. If you have no noise, employing a filter you do not need generally steals a little performance. Not enough to obsess over. There should be no effect on target id either way.

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1 hour ago, Relicrecoveryspecialist1 said:

I had planned on going all metal, will that change the VDI numbers any or will they still stay the same, as say I know what a bullet rings at as, would it change anything on that end or stay the same?

Just to add onto or clarify what Steve said above.  He keyed onto your DST question (bottom line, don't worry about it) but to answer your specific question regarding whether All Metal affects the VDI numbers, the answer is no.  They are consistent whether or not you are in all metal.  Liked the F75 but have since moved onto the Deus and Equinox for relic, beach, and coin detecting.  But I liked the F75 ergonomics and performance so much, I have hung onto it even though it mainly guards the garage for me now.  I relic hunt around the mid-Atlantic, primarily Virginia. Have a good outing and let us know how it turned out.

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What Chase said! :smile:

The BIG difference between all metal and disc is that all metal with reveal targets without a target id. The targets that do not show up in a disc mode. You get that faint whisper with no target id, you have to decide to dig or not. Those are the really deep ones only a PI can get.

Try disc mode out with an air test, target under the coil. Sharp hits in the axis of the coil. Now try all metal. All metal expands the area that will give a signal by a large factor, giving you more ability to pick up off center targets.

I love hunting with the F75 in all metal mode and just watching the numbers when I need to. Disc mode is more a cherry picking mode for me.

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1 hour ago, Chase Goldman said:

Just to add onto or clarify what Steve said above.  He keyed onto your DST question (bottom line, don't worry about it) but to answer your specific question regarding whether All Metal affects the VDI numbers, the answer is no.  They are consistent whether or not you are in all metal.  Liked the F75 but have since moved onto the Deus and Equinox for relic, beach, and coin detecting.  But I liked the F75 ergonomics and performance so much, I have hung onto it even though it mainly guards the garage for me now.  I relic hunt around the mid-Atlantic, primarily Virginia. Have a good outing and let us know how it turned out.

Thanks a bunch. My brother has the Equinox now, and I’ve got the F75, so we’re going to some virgin ground tomorrow to hit it to see what we get. I’ll be sure to film it, and put it up on the YouTube channel. 

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