Geotech

kac, I don't see what you think you see. Furthermore, if someone wanted to counterfeit coins I think a BU 1943 quarter would be a poor choice. If you really think it's a fake then buy it, and then shut the guy down.

Looks legit. You can look at the sellers "sold" items and see they have sold a boatload of coins in a variety of conditions, and the selling prices reflect reality. Here is just the 1943 quarters they've sold: 1943 quarters If they all looked exactly the same then I would suspect funny business, but they all have slight variations. Counterfeiters mostly target high-grade or rarer coins, not mundane quarters. I own a counterfeit bust dollar and trade dollar, bought at a flea market. The seller said up-front, "These are fake."

Sometimes it's more fun not knowing ☺️

Chilean 5 pesos

In the US, the Moss-Magnuson Act allows the end-user to do their own repairs, and forbids the manufacturer from voiding the warranty when they do. The exception is if the manufacturer offers to do the repair for free. In fact, the "warraty void if seal is broken" label is technically illegal under the MM Act. Yes, it was simply a case of "do what they did."

Most brand-name batteries have a leak warranty, they will repair/replace a device damaged by leaky batteries.

Management was gun-shy to do anything differently than what others (Garrett, Minelab) were doing. I wanted AA because I personally don't like 9V batteries.

When I designed the TRX, management wanted 9V, I wanted 2-AA, so I designed it for both. It quickly became obvious that 2-AA was the right answer, so when I designed the F-Pulse it was 2-AA all the way. I won't design for 9V again unless a gun to the head is involved. Even AA seems to be endangered, as more & more designs are moving to rechargeable lithium, many with no dead-battery backup option. Not sure how I feel about that.

99% odds it's a fake. Looks to be cast, not struck. The goldish tint is probably what's left of the "gold" plating. Most likely some kid got it at a souvenir shop and lost it playing soccer.

A few of the stories were true. Some were based on a grain of truth with a heaping helping of fluff. And quite a lot were completely fabricated, start to finish.

That's disappointing to hear. I assumed it was written by marketing.

I think all of the companies have waded into the Marketing Malarkey at one time or another. White's once advertised the DFX as running 6 frequencies. Garrett once claimed the Infinium was 99 frequencies, though that one gave me a chuckle as it was clearly a tongue-in-cheek poke at Minelab. Recently, FTP marketing was wanting to make some kind of weird technical claim about the upcoming Impulse/Manta, but (hopefully) I shot that one down. If a product is good, you shouldn't have to lie about it. And if you do have to lie about a product, it means a lot of other things have gone wrong.

Rudder is often stuck or unresponsive. But I see a lighthouse, hope it's the port and not the rocks.

If you want to understand frequency content, TX current gives a much clearer picture than TX voltage.

The RX coil in a detector is almost* always used in voltage mode, so that the magnetic field induces a voltage (EMF) across the coil, not a current through it. See Faraday's Law. Mags may or may not use an RX coil in a similar manner, and may otherwise have similarities (some mags are designed in a similar way as a PI detector), but they are really different animals. * At least I've never seen an RX coil set up in current mode, outside of stuff I've done.

It's nether radio-like nor magnetometer-like. It's transformer-like. It's complicated. With a sinusoid TX (most SF-VLFs) the return signal from eddy current targets (non-ferrous) is a sinusoid at the same frequency. No distortion, no harmonics. Ferrous targets can distort the signal according to their B-H curves, but a SF-VLF doesn't consider the distortion. MF detectors don't use sinusoids, they transmit triangle/ramp looking waveforms which have a lot of harmonics. Non-ferrous eddy responses are exponentials which also have harmonics, and ferrous responses are distorted triangle/ramps. These can be processed in the raw (time-domain: BBS/FBS) or filtered (freq domain: CZ, DFX, V3). Equinox is direct-sampling so it's hard to say which method is used, but freq domain seems easier. Not sure what else you're asking. If you're using an oscope, then this is a triggering issue. MF waveforms are difficult to trigger on. Also, it's critical to look at the current waveform, not the voltage.

I also don't pay any attention to social media, but you & I are in the minority. That's where the younguns hang out.

Probably White's, like FTP, has recognized that the majority of the action has moved from forums to social media. I think the heyday of the forum is behind us. No point in paying for vanishing returns, especially when social media is free.

That's how BBS/FBS works. A single 3.125kHz cycle, followed by a burst of (8) 25kHz cycles. Repeat. Equinox does both frequencies at the same time, same as DFX & V3. Either way, you are dividing the TX power amongst frequencies, whether in amplitude or time.

Aww c'mon, I would never do that. Not even for a steak dinner.

Building a 5-frequency metal detector would not be difficult, and there are plenty of processors with more than enough horsepower. But the transmit power gets divided amongst each frequency so you lose depth. There are tangible benefits to 2 frequencies. There are additional tangible benefits to 3 frequencies. There are almost no tangible benefits to more than 3 frequencies. That is a correct assumption.

That is a fair statement, and if what I have to compete with is performance, I am happy to do so. But some people buy into the gee-whiz factor more so, and if I come out with a 3-frequency detector they're gonna ask why I couldn't do 5, or 17, or 28 frequencies. Things no one else has done, either. The only way I can compete with false claims is to trump them with more false claims of my own, something that never benefits the end-users, and personally offends my sense of ethics besides. Instead, I'll just state the truth and do the best I can.

Yes. I used a magnetic field probe I designed & built. There are at least 2 threads on Geotech discussing all this, including scope pics.

El Nino, looking at the TX voltage on an MF detector is next to useless, you gotta look at the TX current to see what is going on.

And that's what I've done.