Can we have a good in depth talk about frequency?

[calabash digger]

Let me state first off that I'm coming at this from a relic hunter view point first. Has anybody ever relic hunted on this forum with 28 kh ,54 kh, or 74kh? I know those are gold freqs. About six months ago I guess Deus released the hf coils. I was told they wouldn't help us in the relic game because they ran such high freqs. So I ran mine in 14 kh and left 28kh and 54 kh alone. TNSHARPSHOOTER and others over on another forum kept telling me you need to run the higher freqs back over you iron loaded sites. Well I finally did. It didn't take long to realize after pulling 20 to 25 non ferrous targets from a small area loaded with iron that we pounded with 7kh and 14 kh that something was going on. Some will say your only going to dig small targets with those freqs. that's not entirely true you also dig buttons. giant dandy buttons all the way to cuffs that were masked and the 14 kh couldn't see them. Out of the 20 to 25 targets I dug above 3 or 4 were buttons including a script a war of 1812 button. I have been using this technique for months now and it works . Its a NEW way to relic hunt and it works . I have tested targets and 14 kh might see or 54 kh might see it but one or the other wont see it. Some low conductive buttons hiding in the iron can be ran with over with the deus in 14 kh and will not even peep on it. Switch it to 54 kh and it smacks it. Or vice versa 54 kh might not see it but 14 kh smacks it. How many of you guys have ever tried this?? How many of you guys have even ever heard of this? It works and I know quite a few people who are doing this and making banner finds on other forums doing so. You can take a beat up iron loaded civil war site and go back over it in a higher freq and find targets others detectors just couldn't see in 14kh, 15kh, 17 kh etc.. So now that you know where I'm coming from. This is why the Nox is such a big deal for us. We are now able to hunt with a machine that can run those different freqs at one time and unlock targets that a single freq just cant unlock. I'm not going to say your going to load a 5 gallon bucket up every time using this technique but you will pull a few relics from a beat up site that quit producing long ago doing this. I found a piece of colonial gold in iron in 54 kh doing this on a colonial site that's hard to dig a bb off of. It was only 2 inchs deep. Why had no one found it? It was laying in a spot with dig holes all around. Go check out the video of the deus and nox where I put that gold piece in iron.. Deus cant see it in 14kh , nor can the F75 or the AT GOLD. Deus will hit in 54 kh .... That's where I'm coming from guys...

 

[halfstep]

I agree about the frequencies. With iron and or trash, I think some frequencies will get a response on targets that other frequencies miss. I can see why the nox 800 is getting great reviews finding targets that other detectors have missed. In theory, it should cover a wider range of targets in a wider range of conditions and in reality, it seems to be the case. I am on the waiting list for one and hope it comes in soon. It will be for my wife but I will use it some as well. I have a ctx and really like it. It is great machine and I am finding lots of stuff. I have watched some of your vids and see the effort you give to provide usable info that, if a person pays attention, they can save themselves a lot of time and get more out of their detector. Knowing what your detector can do is important but knowing what it can't do is equally important.

 

[vlad]

VLFS: Frequency can be a funny thing. The closer you get to 0 the less the ground effect, including wet salt (some early Garrett operated at 1 kHz). Silver seems to respond strongest at 2.75 kHz (1280X and Headhunters.) And small/thin gold rings will hit, but only shallowly. Iron is also hit hard and discrimination is not as efficient (and hitting conductors in iron may be difficult-at best.)
Take a gold detector that gets great response on low conductors, and put it in medium/harsh mineral added to wet salt. and the depth may be so slight that its not an effective choice.
It seems the smaller the gold (#6 and up birdshot sized nuggets) the harder the hit with the higher frequencies-but depth is limited; the worse the mineral up to a certain point and they may have no penetration. I've seem ground so bad a 100kHz unit would not hit a coin on the bare ground-yet in moderate mineral they will hit a coin with several nails above/around it. Size is everything too-a big enough target probably responds to most any frequency. I saw a story where a person using an Ace-250 (not exactly a deep seeker or a gold detector) hit a gold nugget of several pounds.
Also had some very extreme depth on silver dimes/pennies with units between 12-15 kHz which hits hard on low to medium conductors, and apparently high also-in light to medium mineral.
(It seems this range may be more efficient on the total range of coins and jewelry-as a compromise, but not the optimum for either high or low conductors.) I was hunting a field with a
Compass X-100 (13.77 kHz) and got a good solid hit at nickel; tried my Mk-1 (6.592 kHz) and when it would hit (not every sweep) it registered low foil. The item was a dime sized alloy bar token. The same Compass (16" loop) brought up a woman's 1929 class ring, lost that year, 60 years later at 11" with a reading of square tab. (I use a double ground balance when possible; balance the all metal mode,
then I add just a small amount of discrimination for mineral to the disc. side-well below nail.)
Something else to note is that the higher frequencies with more energy fill the Q of the loop easier and do it with less power needed from the batteries.
Then there are the dual/multis maybe the best units for all targets (above tiny nuggets) and in bad ground and salt (until you hit black sand.) But the slower recovery needed for the units to process
limits them more when multiple targets are in proximity-could they operate with a faster speed-probably, but the efficiency might be much less.
Is EQ Multi-IQ actually a new generation; since Whites first made the DFX many years ago, and V3(i) later, what do the new ML's do differently than the Whites (and how much is ad copy?)
WHAT would really be interesting is to test for various targets especially in size, in the different single frequencies in pinpoint and stat modes, and see how high conductors respond to high frequencies,
and low conductors to the lowest frequencies-and at what point targets drop out (if there is a TID what it registers,)
The ONLY way you will get every goodie, is to dig everything. (PI's operate over a wide frequency range with up to 10X the power of a constant transmission VLF, but only have-for most-shallow iron i.d.)
EDIT