Minelab Equinox Challenge

[Mark-VA]

I guess I've over complicated the matter, after all we're only gathering radio waves.

[EL NINO]

..Coil with ferrite core .../Carl Moreland/ ...I used a practical similar solution to be an external ferrite AM antenna from receiving Tecsun Pl-365 ...

[Mark-VA]

In relations to antenna aperture, I have used 5 different devices to collect the output of my Equinox coil.
1. a small microphone
2. a large microphone
3. a White's TDI 350 Super Pulse mono coil
4. the 5" DD coil from my F75
5. a small set of headphones

Each could identify the frequencies transmitted
The microphones caused the least interference to the detector
The 350 coil caused the most interference to the detector
The F75 5" coil gave the best representation (according to the screen shot by Carl) of the frequency 5 but caused a lot of chatter from the machine.
I also have other coils I could try but I need to make an adapter so I can insert the feed wires to the coil plug. It's just to cumbersome to strip wires and insert into the coil plug and get a good connection.

F75 11 DD coil
White's 11" dual field coil
White's 6" dual field coil
11" DD SEF coil for the V3
Fisher F22 stock coil

No idea which would be the best receiving antenna to use.

But I'm open for comments.

[Mark-VA]

MarkG, for example, took your measurements at Park1 at -40khz is significantly lower than at Park1 -20kHz,[ATTACH]45172[/ATTACH] ..MarkG, for example, was interested in your measurements from Park1 aperture -40khz is considerably lower than at Park1 -20kHz, when I watched the equinox 800 tests done by colleague WM6-test on the mineralized substrate -Liapor -tam the 40khz sequence showed as much strong .. small things as compared to multifrequencies..To compare the Equinox 800 test - the 11 DD in the mineralized - from WM6 colleague, it is definitely an interesting comparison ...:[ATTACH]45173[/ATTACH]

Interesting, I'll check something else.

[EL NINO]

MarkG, for example, took your measurements at Park1 at -40khz is significantly lower than at Park1 -20kHz, ..MarkG, for example, was interested in your measurements from Park1 aperture -40khz is considerably lower than at Park1 -20kHz, when I watched the equinox 800 tests done by colleague WM6-test on the mineralized substrate -Liapor -tam the 40khz sequence showed as much strong .. small things as compared to multifrequencies..To compare the Equinox 800 test - the 11 DD in the mineralized - from WM6 colleague, it is definitely an interesting comparison ...:

[Mark-VA]

Sample Rate

Increased my sample rate close to double. It has made a huge difference. Comments welcome.

[waltr]

Valid point. It appears the graph at the bottom indicate the true frequency. I checked my F75 and it also indicated the correct frequency.
I got very accurate results when checking the single frequency choices on the Equinox too.
It's fun to say the least.

Yes, those captures are good enough to ID the Main Frequencies. It is just all the harmonics that are suspect.

[Mark-VA]

Valid point. It appears the graph at the bottom indicate the true frequency. I checked my F75 and it also indicated the correct frequency.
I got very accurate results when checking the single frequency choices on the Equinox too.
It's fun to say the least.

[waltr]

This is my scope capture of Park 1 multi.
Does this not plainly show multi frequencies being captured with the main frequency by 12kHz?
Or is that an average frequency?

By simply Eye-Balling the Time domain capture (scope) I can see at least two Frequencies.There are the larger amplitude wave forms with 10.5 displayed in 1.36 ms which calculates to about 7.7kH.
Then I count about 5 shorter period, lower amplitude wave forms riding along. So 7.7kHz time 5 is 38.6Hz.
The Spectral display confirms this.

There are also many Harmonics and mixing produces which also show in the spectral display. These may be REAL or can be Artifacts of digital sampling.
Since the time domain display does not show SMOOTH curves but is Jagged that shows the Sampling Rate could be much faster.
The Harmonics in the spectral display seem to be about 48kHz apart which would match the Sampling Rate/4.

[EL NINO]

This problem with setting only the Equnox multifrequency, eg Equinox on 1F works perfectly, I do not have any problem with other detectors ..
I believe that here finds someone .. how to set how to set it on multi TX at Equinox ..
At the beginning of the research of the Equinox multifrequency - this program showed the apartment very good ..
For some more accurate measurements, I will have to find some other more efficient and accurate alternative ...

[Mark-VA]

It's been fun but I think it is time for me to bow out of this feeble attempt to replicate Carl's scope analysis using the Visual Analyzer I presently have.

http://www.sillanumsoft.org/prod01.htm

If accuracy depends on correct settings, for each detector scanned, then my attempts will always fall short of providing me with the truth.
It is a useful tool with limited capabilities compared to some of the more expensive scopes used on this site.
It does provide a starting point for what is being analyzed but not professional enough to get in-depth and highly accurate readings.
I really enjoy this site and can say I've learned a lot over the years.

[EL NINO]

Markg should be the so-called TX multi. frequency repetition ... -but I'll get other values -22.5 kHz for Beach programs and 26kHz for other programs ...- I'm not sure about this, because the results are very dependent on the FFT setting, you set the FFT to 64,000, and I use 32,000 FFT in my measurements ... the highter value FFT-64000 - limits the range of the received frequency On the spectral analyzer to max 35khz ... what is a little...For example, the minelabs FBS has a recurrence frequency of around 14kHz...

[Mark-VA]

Park 1 Multi frequency

This is my scope capture of Park 1 multi.
Does this not plainly show multi frequencies being captured with the main frequency by 12kHz?
Or is that an average frequency?

[Mark-VA]

F Pulse frequency

How close to correct is this frequency capture of the Fisher F Pulse pin pointer?

[EL NINO]

Because the X-axis Log ON .. reduces Spectral Field Transparency...