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frequency?:ausflag:
- Thread starter emubob
- Start date
thats been up for debate for a while, ive read various posts where people claim that certain channels are more sensitive to this or that......i cant remember any specifics though and i would have, i want to maximize my finds just like anyone else.....
i just noise cancel occasionally but my etrac always seems to choose 6 or 9 or sometimes 11 usually. i think its on channel 6 right now. i dont normally noise cancel as part of my start up routine. i just do it if i feel like it, like if im getting very erratic behavior out of my etrac. i figure that the channel with the least interference would probably be that best channel. whatever channel has the least interference, then crank the sensitivity up.
on the other hand, what do i know.
i just noise cancel occasionally but my etrac always seems to choose 6 or 9 or sometimes 11 usually. i think its on channel 6 right now. i dont normally noise cancel as part of my start up routine. i just do it if i feel like it, like if im getting very erratic behavior out of my etrac. i figure that the channel with the least interference would probably be that best channel. whatever channel has the least interference, then crank the sensitivity up.
on the other hand, what do i know.
Its unclear to me whether the noise cancelling channels are shifting transmit frequency bandwidths or shifting the receive frequency bandwidths of filtering algorithms.
If anyone knows for sure please comment! My guess, its a shifting DSP noise filtering algorithm.
Anyhow, if in one of those rare areas with absolutely NO EMI radiation from power lines, radio/cell towers, other detectors, etc. and the ground is pristine neutral, say a deserted beach area for example with neutral soil...go ahead and choose any channel you want but make sure its the quietest one.
However for most areas, the most efficient quietest noise channel is the best and is typically chosen by using auto noise cancel feature.
Especially true with larger coils which are prone to receiving more eletro-magnetic energy, they're basically a larger receive antenna.
It all boils down to the best signal/noise ratio, basically the channel with the lowest noise floor.
The more EMI etc. noise allowed by manually choosing an incorrect noise channel, the more erratic and less depth capability your detector will have.
Having said all this, there are some who swear channel 11 is the deepest seeking channel. But most of them are beach hunters and could have the luxury of neutral soil and no EMI interference.
There were a few instances when i was detecting under or around high voltage power lines and manually scanned the channels to find one a little quieter.
Sometimes that worked just a little and sometimes it didn't work any better than the auto noise cancel feature.
If anyone knows for sure please comment! My guess, its a shifting DSP noise filtering algorithm.
Anyhow, if in one of those rare areas with absolutely NO EMI radiation from power lines, radio/cell towers, other detectors, etc. and the ground is pristine neutral, say a deserted beach area for example with neutral soil...go ahead and choose any channel you want but make sure its the quietest one.
However for most areas, the most efficient quietest noise channel is the best and is typically chosen by using auto noise cancel feature.
Especially true with larger coils which are prone to receiving more eletro-magnetic energy, they're basically a larger receive antenna.
It all boils down to the best signal/noise ratio, basically the channel with the lowest noise floor.
The more EMI etc. noise allowed by manually choosing an incorrect noise channel, the more erratic and less depth capability your detector will have.
Having said all this, there are some who swear channel 11 is the deepest seeking channel. But most of them are beach hunters and could have the luxury of neutral soil and no EMI interference.
There were a few instances when i was detecting under or around high voltage power lines and manually scanned the channels to find one a little quieter.
Sometimes that worked just a little and sometimes it didn't work any better than the auto noise cancel feature.
When I go beach detecting I leave my ET on 1 to 3 for coin hunting or channels 7 to 11 for the Gold hunting , I feel that the high channels are to do with the high Freqs the ET has and the lower ones for the low freqs.
As for the best freq for finding targets , if a target is found the ET will use which ever freq works best for that target . I have been told that the ET although has 28 freq's is punching them out 1 at a time but in a very quick order so looks like its multi, how true I don't know .
The Whites V3i has 3 and can use all three but again I am not sure.
Still the ET/Explorer/CTX and so on are the Bee's Knee's what evers true.
As for the best freq for finding targets , if a target is found the ET will use which ever freq works best for that target . I have been told that the ET although has 28 freq's is punching them out 1 at a time but in a very quick order so looks like its multi, how true I don't know .
The Whites V3i has 3 and can use all three but again I am not sure.
Still the ET/Explorer/CTX and so on are the Bee's Knee's what evers true.
I like to do it exactly the way the book says too when I begin a hunt, then I do it again as I get some distance from that area. If I overload on something, I do it again. I don't have any particular reason for doing it then, but it can't hurt. It's a computer after all, they like being reloaded/rebooted/refreshed every once in a while.
surfchunker
New member
on the 705 the noise cancelation has a minor shift in Freq. less than .02 kHz per channel shift with the middle 0 channel being exact and lower channels lessens it and higher channels raise it but it is very minute. Don't know about the ETrac
emubob said:
I don't think there is "one best" frequency for any one particular type of metal. Much of how a target responds to a specific frequency depends on mineralization and site conditions.... not just operational frequency. With that in mind, we do know that, lower conductive targets respond more readily to higher frequencies. And higher conductive targets respond more readily to lower frequencies. I've read where small silver and copper coins respond best in the range of 2.5kHz - 3kHz. Larger silver coins respond to regressively lower freqs. On the other hand, US nickels respond best around 17kHz. Gold jewelry items respond better to frequencies in that range and higher, depending on the size, shape and alloy. If you take a look at some of the better "raw gold" VLF detectors, their operating frequency surpasses 50kHz. Your ETRAC transmits multiple frequencies from 1.5kHz to 100kHz. So, you have all the bases covered. But, you can't chose which one to use, individually.
To address your question as to which frequency finds the most targets......it will depend on the types of targets in the area you are hunting. If you are hunting around an old homesite that is loaded with nails, chances are you will detect more nails than anything else. On the other hand, if you are hunting a yard that has not been littered with modern trash, you might be lucky and find more silver and copper coins than anything else. Frankly, just about any frequency on a modern metal detector will find anything metal. With the implementation of discrimination, you are just able to ignore some of it. .
If you have some time, do an online search for metal detecting articles by George Payne. His research and knowledge on how frequencies interact with metal detector technology is some of the best information you can read. JMHO HH Randy
i wish minelab would just tell us what the different channels TRULY change and operate. i know its probably proprietary so they wont, but wow it would sure help. its like some "great mystery" and should it really be that difficult??? Im going to leave mine set to channel 6 forever and take my chances. its right in the middle of all the frequencies.....or is it??? (just kidding, sort of)
Digger I love your tag line....i need to frame that and hang it on the wall. ive got about 30 years in now myself off and on.
(just kidding, sort of)Digger I love your tag line....i need to frame that and hang it on the wall. ive got about 30 years in now myself off and on.
In my initial response, I was referring to the operating frequencies. If we are talking how the Noise Cancel channels might affect performance, and how it correlates to Sensitivity, Volume Gain and Volume Limit, here is the link to an excellent article written by Gordon Heritage of the UK, one of MInelab's TreasureTalk blog posters.
http://www.minelab.com/treasure-talk/e-trac-manual-versus-auto-features-for-expert-users
http://www.minelab.com/treasure-talk/e-trac-manual-versus-auto-features-for-expert-users