E-trac Channels.....Whats the difference??

[gregliss]

What is the difference between the different channels on the e-trac?

In another post, another member mentioned that the explorer has a better chance of finding gold in channels 1 to 3. So I'm just interested to see which channels on the E-trac, in a hypothetical interference free world, would be best suited to say gold or silver targets.

Does anyone have any technical data on the difference between the different channels?

Cheers,
Greg

 

[Neil]

like has he found soome smaller gold that wont come in on the channels and so forth. Never heard of this method but sure am open to suggestions

Neil

 

[BountyHunter]

For exactitudes' sake please take good note that we are talking about the "Noise Channel".

Why I point this out is because there is also other kinds of channels mentionned in the Minelab E-Trac owners manual (in page 54-55 / pdf page 29).
This is the sensitivity section.

Please have a looky at FMDF, look for thread "Finding small gold with Minelab Explorer SE"

 

[Neil]

I just ran searches for this thread by BounyHunter and cannot locate it and would like to see his findings.
Thank you,
Neil

 

[Chris(SoCenWI)]

Yes,

Some frequencies are better than others for certain items.

But...

The explorer transmits and receives several frequencies over a fairly wide range. The channels on the Explorers just shift all the frequencies by a small amount. Say if one of the frequencies was 10 kilohertz, channel change might go 10.1, 10.2, etc. Not enough to make a difference.

It isn't like a White's or other machine where you have two different frequencies spaced quite a distance apart.

 

[Diggler]

Thanks BountyHunter - I copied this info from his thread.

If anyone is still interested in trying to replicate his results or use them in the field here it is:

I have gold samples in the sizes of 1 grain, 2 grain and 3 grain.

I always figured that my Minelab Explorer SE wasn't using the 100KHz frequency all the time; this depending on wich channel it was when we noise cancel automatically or manually.

I have therefore made some tests playing with the channels and looking at the most sensitive one.
I also established that Ferrous rejection could only be set at 31 at most to obtain a reading of my small samples, Conductivity readings were in the 00 to 05 range.

It was mandatory that I set the DEEP option to ON for any detection sensitivity and consistency

UPDATE: I forgot to mention that I have tested with the default 10.5 inches SlimLine coil and it was not as good as my 4.5" x 7" DD Excelerator coil. All tests below and their results are reflecting the use of this small DD Excelerator coil

1- I started with my 3 grain sample and sensitivity at default of 22 and channel default #5.
--> Result: the sample was not detected

2- I then changed channel to #1 and kept same sentivity of 22
-->Result: 3 grain gold sample was Detected with some intermittence

3- I set sensitivity to 23, nothing else changed.
--> Result: The sample was detected with consistency

4- I tried now with channel #2, 3 grain sample, sensitivity 23.
-->Result: the sample was detected with some loss of consistency

5- I tried now with channel #3, 3 grain sample, sensitivity 23.
-->Result: the sample was detected with intermittence.

6- I tried now with channel #4, 3 grain sample, sensitivity 23.
-->Result: the sample was not detected

7- I reverted to channel #1, used the 2 grain sample, sensitivity 23.
--> Result: the 2 grain sample was not detected

8- Still on channel #1, 2 grain sample, sensitivity now at 25.
--> Result: the 2 grain sample was detected

Conclusions:

-Any channel above #3(three) wasn't sensitive to small gold.
-Sensitivity needs to be at minimum set at 23 on most sensitive channel.
-You need to be in "All Metal" with "Iron Mask" set at 32. At 31 it will detect also but less consistently.
-Deep option(in Recovery sub-menu) needs to be set to ON
-Detection of the sample is most sensitive within 2 inches of ends of the DD coils' center blade.
-these findings are also verifiable with the Sunray inline probe fitted on my Explorer SE

So it appears we are using these gold sensitive high frequencies only on channel #1 to #3.

-Also, I will need to obtain small gold ear pins to verify their coordinates as to the Fer-Cond numbers, to see if one can set more Ferrous rejection than 31 with these targets
UPDATE: I obtained small gold ear pins and they were reading often at 31 of Ferrous content! So do not discriminate out 31 if you want every bit of small gold.

I hope this thread will catch on with current users and others. I'm hoping this will have people report that they have found something golden that they know they wouldn't have in the past

Lets say you find a medal and before this knowledge, it was almost assured an Explorer user wouldn't find the small chain. But now with this new knowledge, the person succeeds in finding the small chain to the medal, this would now be awesome!

Enjoy!

Thanks again Bounty Hunter


These settings with a smaller coil would really be interesting...

 

[Larry (IL)]

Minelab is utilising FBS technology with simultaneous frequencies ranging from 1.5kHz - 100kHz, the signal received from the detectors coil is analysed from a wide range of responses. ( not frequencies )

Minelab claims many frequencies are transmitted but they make no claim that any more than one or two of those are received and processed. The channels used are more likely to be frequency offsets from the primary frequency in use like other high end detectors. To assume that Minelab is processing frequencies up to 100 kHZ would likely be a poor assumption. IMHO

 

[Ray-Mo.]

n/t

 

[Diggler]

Yes let us know the results either way. Even if it doesn't make sense, if it works it is useful information.