Minelab Equinox 800 Frequency

[Mark-VA]

extensive study

Extensive study reveals Carl was right.

[Mark-VA]

This is what I see:

Park & Field: 7.8k + 39k
Beach: 7.8k + 18.2k
Gold: 40k + 5k (the 5k appears to be a useless amount, probably just to say it is "multifrequency")

I think I should leave my curiosity and desire to know the truth to Carl, the expert.
After years of storage it seems my oscilloscope has bit the dust.
I need to be satisfied with what I have, until 1st Texas can develop something that trumps the Equinox for fair ground and the TDI for the hot ground.

[ivconic]

If you want to keep it budget and yet to be able to do a lot; i can suggest you something like this:

https://www.poscope.com/product/poscope-mega50/

[ivconic]

Great video.
Very interesting, but I don't think it would help me measure detector frequencies.

Instead of suggested speaker (somewhere in the video) you can make and put any coil parallel (flat on) to coil you want to examine. (preferable resonant to the one you want to examine)
Follow the video procedure. Yes you can measure detector frequencies, of course.
Instead high end oscilloscope from video; you can use software based one. I think there is a plenty available on the net for downloading, including FFT and spectrum analyzer.

[Mark-VA]

Great video.
Very interesting, but I don't think it would help me measure detector frequencies.

[Mark-VA]

Thanks so much. It's quite obvious my scope is out dated.
I'll study the video tonight.

[ivconic]

[Mark-VA]

I just so happen to work for a pc board manufacturer and was wondering.
If the company I work for might happen to have a tester I could use to test my detectors?
What would be the easiest tester to use?

[ivconic]

... A 5:1 ratio is better... and what I expect from Minelab.

Precisely.

[Carl-NC]

Looking on a spectrum analyzer will show a lot of harmonic spurs that are just byproducts. You can see the see the same thing with DFX, V3, and BBS/FBS. I prefer to focus on the TX current waveform to see what makes sense.

In multifrequency, a 3:1 ratio barely gives you enough spread for target info, though it is sufficient for salt compensation (as is done in the CZ design). A 5:1 ratio is better. I would not expect the Eq to process additional intermediate frequencies when those would provide no additional useful information (as is with the V3's 7.5k). So my analysis is based on what I see in the waveform, what makes sense in processing, and what I expect from Minelab.

[Skippy]

That's curious, and seems to conflict with others observations, I must go and take another look at Chiv's scope traces and spectrum analysis.

I was pondering how you might work out if only two frequencies were processed, when three were transmitted.
If you deliberately created 'interference' at one of the freqs, and it had no discernable effect on performance, then it may be true to say that it's ignoring that particular freq in that operating mode. No guarantees, but it seems a viable experiment.

As the Nox seems capable of generating any reasonable arbitrary waveform, and processing said frequencies in a variety of ways, it's not unlikely that future software updates may result in new frequencies / ground-elimination strategies etc. And you wouldn't necessarily know about it, unless it was obviously advertised -- "New Meteorite 1,2 modes!" etc.

[Carl-NC]

To summarise: Park/Field/Gold : Multi-IQ = 7.8k, 18.2k, 39kHz
Beach multi-IQ :7.8k, 13k, 18.2k, 39kHz

This is what I see:

Park & Field: 7.8k + 39k
Beach: 7.8k + 18.2k
Gold: 40k + 5k (the 5k appears to be a useless amount, probably just to say it is "multifrequency")

[Skippy]

Cipher's posts seem to fit into the 'speculation' category, he's not basing his opinions on the facts, despite there being a link to another detectorprospector thread, where the frequencies actually used are presented:
https://www.detectorprospector.com/f...spectrum-test/

The most useful post in the original thread is this one by Dubious:
"Unless someone goes to the trouble to reverse engineer the hardware and software--and explains it all--we'll never know the details. But it shouldn't matter at all in terms of using the Nox effectively."

And regarding this:"I didn't think 7.8kHz was an option?"
You obviously haven't read the two threads on here that I linked to. 7.8kHz is NOT a single-frequency option, it IS one of the Multi-IQ frequencies.

To summarise: Park/Field/Gold : Multi-IQ = 7.8k, 18.2k, 39kHz
Beach multi-IQ :7.8k, 13k, 18.2k, 39kHz

[Danno]

Quote:"I did read somewhere ....."

In print, or online ? If it's online, can you please provide a link, so we can assess how valid it is. As you must realise, the internet is absolutely awash with ill-informed, fraudulent, speculative, biased, non-scientific hearsay about what detector xyz does or doesn't do.

How ML process the signals is all down to the machine's embedded software, so it would be very difficult to determine what they process, how, what decisions are made re: target/not. etc.

https://www.detectorprospector.com/f...-in-each-mode/

Post by cipher

[Danno]

n park & relic modes it runs 7.8kHz & 39kHz. In beach mode it runs 7.8kHz and kHz.

Didnt think 7.8khz was an option?
whats the other in beach as you haven’t put one?