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Explorer SE Pro Frequency Questions

C

ColonelKyle

New member
Does anyone know the frequency ranges associated with the Noise Cancel channels on the Explorer SE Pro? I ask for two reasons. The first is that whenever I Noise Cancel and the machine settles on channel 6 my Garrett Pro Pointer interferes with my detector to the point where it is useless. I now have to initially noise cancel with my Pro Pointer on and thus have eliminated the use of channel 6. The second question is: has anyone purposely selected certain channels, based on their specific frequencies, to hunt more effectively based on what they are hunting for i.e. higher frequencies for gold vs. lower to middle frequencies for coins (assuming no interference)? I know that the manual says to let the machine pick the best frequency. Any info here would be appreciated.
 
Check out this blog. It concerns the ETrac but it shares the FBS technology with the SE. It's all about Auto or Manual Noise Cancel and how using lower Noise Cancel numbers can enhance performance:
http://www.minelab.com/usa/treasure-talk/e-trac-manual-versus-auto-features-for-expert-users
 
Yeasty said:
Check out this blog. It concerns the ETrac but it shares the FBS technology with the SE. It's all about Auto or Manual Noise Cancel and how using lower Noise Cancel numbers can enhance performance:
http://www.minelab.com/usa/treasure-talk/e-trac-manual-versus-auto-features-for-expert-users
Click to expand...

Great post!
 
Colenel,

I'm pretty sure it really doesn't make a difference which channel the machine selects in regards to sensitivity to certain targets. The explorer transmits square waves of two different frequencies and uses these to create multiple frequencies on the receive side; I believe it monitors frequencies from around 1.5 khz to about 100 khz, with up to 26 frequencies in between. I know some channels monitor less frequencies, I believe it ignores frequencies that are very near power line harmonics, because these would generally be to noisy to be usable. When you noise cancel you are slightly changing the frequency of one of transmitted square waves, which in turn slightly changes the receive frequencies. Hold the search coil near you head phones when you hit noise cancel, the coil will induce a signal in the headphones and you can actually hear the machine shift through the channels.

It is true that a low frequency say 1.5 khz would be better suited to detecting certain objects than a 100 khz signal, and and visa versa for other objects. This is why single frequency machines need to find a compromise frequency that does reasonably well for many objects. With the FBS technology the detector is monitoring frequencies across the entire spectrum. The amount of shift from channel to channel is quite small. If channel 1 is 1.5 khz to 100 khz, channel 2 may be 1.51 khz to 100.1 khz; channel 9 1.59 khz to 100.9 khz. These are just made up numbers but the idea is that at any given noise channel you are still monitoring across a wide range of frequencies.

Comprende?

Chris
 
Chris, your understanding of FBS is very close to mine.
Here's another excellent bit of info from MineLab. Check out Section 2.9. The entire article is pretty deep in theory.

http://www.minelab.com/__files/f/11043/METAL%20DETECTOR%20BASICS%20AND%20THEORY.pdf
 
I agree with Chris on this........

Even though you are shifting the freq. it is in such small amounts(.01) just enough to run smoothly.

I would say, Keep doing what you are doing......Probe on, then detector. This will reduce the issue. With little to no sacrafice.

You could always change to a Sun Ray X-1 probe. That would eliminate the issue.

Just my opinion......
 
Interesting thread bud. Good info here.
 
I tend to agree with you also Chris about there only being a slight change in freq. The 1.5 kHz would be on key with the Sov.... which is SET at 1.5 kHz increments.... ie 1.5, 3, 4.5 kHz for BBS. You mentioned square waves...... ive heard that before by an overseas detector guru. That would make it like he said .... a hybread PI format. I found it interesting we know about the Sov settings being fixed, but have little info on the Exp. channels. I have NO DOUBT Gordon has a lot of info we dont and wont get from ML. Hes one guy id take advise from in a heart beat. He appears to be saying.... high channels consist of higher freqs ok for EMI but a killer for depth. Ive looked at the patent as well. Looks like it uses the 2 BEST responses and uses one for ground. I dont see why its such a ML secret when several machines use freq shifts to adapt to noise/EMI.

Dew
 
I'm able to use channel 6 on my Etrac and my Garret Pro pinpointer with no interference problems. Wonder why you do have problem?? My doing a noise cancel picks either 6, 9, 10, 11 most all times here. I don't think I have ever seen any other different number ever just those.
 
Some people noise cancel at different heights..... on the ground, normal swing height, or knee height that might affect the channel chosen as does your setting. The heigher the sensitivity, gain or other setting that allow the detector to HEAR more also will affect the setting. Mine normally chooses 5, but on a beach i do much better in 6 manually.

Dew
 
Here is a video of a guy wanding (frequency range tester) the different channels. And they do vary pretty greatly. At least I always set mine manual religiously. 1 is high freq and drops into the lower frequencies up to channel. So basically when I go for gold jewelry I run channel 1, silver I run 8-11 general hunting I run the standard 5. I find my fair share of silver and gold hopefully this will help you guys out on this subject.

http://www.youtube.com/watch?v=xcChyUlgPIs

HH,

Tom
 
As in multiple frequency's vs. One? Either way talking about it is pure speculation (if it was fact based minelab would have released it to the public)., this however is just one little piece of the puzzle.

The finding are also in line with the above links. The software algorithm is something we are not privy to, and how it sorts and process multiple frequency. However the guy in the video is at least attempting to do something tangible, which wins my respect either way. I definitely support and condone this behavior. Most scientific break throughs come from basic analysis/test just like this. Maybe it will provide a spark for someone to crack the FBS code that we would all love to understand that much better. Or minelab could just fess up :poke:
 
as my colleague said "tumble weed rolls by" :biggrin:

blank planet
 
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