Coin on edge problem discussion

[bklein]

I’m seeing a big problem with my EQ800 and coins on edge with the new firmware (might have been there with the old fw too). Videos show that this code seemed to have fixed this problem. But not my machine. What should I expect?
is this a problem with double-D coils or detectors in general?

[Carl-NC]

What's the problem?

[waltr]

I believe the problem is either no or very weak detection of coin on edge.

I have experimented with this with my Mod'ed HH PI detector using an 8inch concentric coil.
The received signal is much less with a coin on edge (surface perpendicular to coil) than when coin is parallel to coil. Same with a 6 gram 14K gold ring.

I think this is simply due to the Physics of the orientation of magnetic field to the target so would happen with ALL detectors.

[kt315]

coin on edge is like orthogonal coils placement in two-box design. you do not need tune nulling of rx signal because there is not signal.
but a way exists. its recall HALLO effect. when a coin gives some region of soil conductivity around in wet environment. this region will gives the reply in RX coil.
small but better than nothing.

[Andi68]

This problem has always existed and miracle detectors have never been.

Actually, if you compare both surfaces, coin is horizontal, coin vertical

[kt315]

some people are very hoping if they paid big money for 'newest duper puper code' that will change something maybe the depth on coin on edge.
not naive, but ML does his gescheft everywhere he just only can. good capitalistic way to do marzha on bare naked place.

[bklein]

Air test here: https://m.youtube.com/watch?v=JAuWhIYyw64
Two other vids on channel similar - on beach sand and one on dirt lot. The ground does bring up some signal.
Other peoples videos show before after new code on equinox it seems to detect ok, but not on mine. They say the ID goes up into the 30’s but it drops to 10 on mine if seen at all. I tried my CTX and it worked great to start then died off after 5 seconds or so of waving the coin. Weird!

Here’s a video of the two firmware versions compared: https://www.youtube.com/watch?v=5xnm8SANn28&t=41s
(that’s not me..)

[Andi68]

I would try a smaller coil.

And somehow I think the old boxes can do something too

[EL NINO]

I have done several tests on different detectors, the coil DD is the most sensitive to such a coin position on the edge-at the ends of the coil-in the place where I crunch Tx and Rx bits of the coil-range more than even 2X over the center of the coil .. so good it is advisable to sweep the coil with 50% over ... it also explains why sometimes you find the most distant signal outside the center of the coil ... Even smaLL DD coils have such a scarcity, but that less sensitive place is smaller ...

[Andi68]

Now the question is - how many coins stand upright in the ground?
or
what do you do with a weak Signal?

[bklein]

Yeah. Guys were arguing that this is not a problem on another forum - that you catch the weaker signal on the edge of the coil and overlap sweep to get the target. But as in my video you never hear the target you never know you missed it. This is true for rings too - so I'm wondering if a non uniform weighted ring like women's wedding rings where stone and mount weigh more, might tend to settle vertically in beach sand. Never read anything about the idea...

[Qiaozhi]

If you picture the magnetic flux lines around the coil and the way they cut through the coin, you can readily understand why the signal is much weaker when the coin is on edge.

[Andi68]

@ bklein-Maybe or not, how do you want to find out?

[kt315]

If you picture the magnetic flux lines around the coil and the way they cut through the coin, you can readily understand why the signal is much weaker when the coin is on edge.

thats why U or V form coil has to seek a coin on edge.

[Andi68]

Do you have a picture example of such coils, kt?