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Anonymous
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can anny one tell me what freq each of the 11 channels of the minelab xs transmit at ? thanks
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A
Anonymous
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Hi S Waite; Sometime ago, somewhere on this forum the following info was posted; (The 1st # is the channel # & the 2nd # is the # of freq. transmitted) 1/20; 2/18; 3/14; 4/14; 5/14; 6/16; 7/20; 8/20; 9/20; 10/17; 11/14. I have never seen exactly what frequencies are actually used on each channel. Perhaps an email to <IMG SRC="/forums/images/ml.gif" BORDER=0 ALT="m~"> would get that info for you, unless it's proprietary, which I doubt because if you have a field strength meter you could pick up the frequencies. Just as an aside, are you related to a person named Richard Waite? Anyway, I know this doesn't answer your question exactly but I hope it helps. HH Jim <IMG SRC="/forums/images/35stars.gif" BORDER=0 ALT=";;"> <IMG SRC="/forums/images/ml.gif" BORDER=0 ALT="m~">
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Anonymous
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using the figures you gave the explorer only uses 6 freq's. i thought it used 28.
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Anonymous
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he is saying the second nymber is the number of frequencies transmitted on that channel.. not the frequency itself.. however this is the first time I have exer seen this.. I was told it always transmits the same 28 frequencies on all 11 channels, but each channel shifts those frequencies by justr a little
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Anonymous
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I've read, can't remember where, that the Minelab transmits less frequencies on some channels than others. I'm guessing that this is because some of those frequencies would lie close to harmonics of 50 or 60 Hz, which is the AC power in US and overseas. Harmonics are multiples of the fundamental frequency. Sound right to anyone?
Chris
Chris
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Anonymous
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I asked minelab if they could tell me what the frequencies for each channel would be and they said that they couldn't give out that information because it was proprietary information so we still don't know.
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Anonymous
Guest
Hi Chris; you are quite correct in stating that some frequencies are harmonics of the fundamental frequency. However in this cse I'm beginning to think they might have some type of chip that is programmed as a frequency generator of specific frequencies because the <IMG SRC="/forums/images/ml.gif" BORDER=0 ALT="m~"> manual does state that it transmits 28 frequencies at the same time. If that 'chip' was programmed to generate frequencies in sequence, I guess it's plausable to call it simultaneous transmission even if there is a 1 or 2 microsecond delay between the transmission of each frequency. We would never be able to detect that delay unless we looked at the output on an oscilloscope.And the manual does say the freq. range is from 1.5 KHZ to 100 KHZ. If it operated on harmonics, which I doubt, the 100 KHZ signal would be so weak that it would simply be useless because as the harmonics increase, thier amplitude decreases. To add to the speculation, Andy Sabisch, in his book ' Mastering the <IMG SRC="/forums/images/ml.gif" BORDER=0 ALT="m~"> Explorer XS and S' states that "The FBS system has variable differences between the 28 frequencies. While the low end 1.5 KHZ and the high end 100KHZ are fixed, the actual frequencies between these two points vary depending on the Operating Channel selected." So he is essentially saying that all channels transmit 28 frequencies but each channel uses 26 frequencies that are unique to that channel plus the fixed 1.5KHZ and the 100KHZ. Well, go figure!!!! Now that I've added more confusion to the original question, I better get the heck out of here before all hxxl breaks loose toward me. In the meantime, HH no matter what frequency channel you pick. Jim <IMG SRC="/forums/images/35stars.gif" BORDER=0 ALT=";;"> <IMG SRC="/forums/images/ml.gif" BORDER=0 ALT="m~">
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Anonymous
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Hey Jim,
I didn't mean to say that the transmitted explorer frequencies are based on harmonics. If I understand correctly the explorer does operate on the frequencies you stated, nominally 1.5kHz to 100khz in 28 increments; when you noise cancel the explorer increments each frequency in this range by a set amount or percentage for each channel; if channel one used the base frequency of 1.5kHz for the first frequency, in channel two this is shifted to 1.8khz, (not sure what the real number is). Perhaps in channel three this is shifted to 2.1khz, etc. And all the other 28 operating frequencies are also shifted by a certain amount. What I mean by harmonics is harmonics of the 50 and 60 Hertz mains power used in the US(60hz) and many places overseas, most of Europe is (50hz). This kind of electrical noise would be found in almost all the places we hunt, except way out in the boonies. I'm speculating that if any of the frequencies for any one of the channels lands on or close to a power line harmonic frequency that minelab decided to not use that frequency because most likely it would pick up a lot of electrical noise from surrounding power lines. That may explain why some channels use more frequencies than others. I could be completely wrong about this, and would be curious to hear other theories.
By the way, I've found noise cancel to be pretty close to useless. I think it works well when you are trying to avoid a single specific frequency, like when working around another metal detector, but that most of the noise we encounter is pretty broadband in nature and the settings from one channel to another doesn't make much of a difference in most cases.
Chris
I didn't mean to say that the transmitted explorer frequencies are based on harmonics. If I understand correctly the explorer does operate on the frequencies you stated, nominally 1.5kHz to 100khz in 28 increments; when you noise cancel the explorer increments each frequency in this range by a set amount or percentage for each channel; if channel one used the base frequency of 1.5kHz for the first frequency, in channel two this is shifted to 1.8khz, (not sure what the real number is). Perhaps in channel three this is shifted to 2.1khz, etc. And all the other 28 operating frequencies are also shifted by a certain amount. What I mean by harmonics is harmonics of the 50 and 60 Hertz mains power used in the US(60hz) and many places overseas, most of Europe is (50hz). This kind of electrical noise would be found in almost all the places we hunt, except way out in the boonies. I'm speculating that if any of the frequencies for any one of the channels lands on or close to a power line harmonic frequency that minelab decided to not use that frequency because most likely it would pick up a lot of electrical noise from surrounding power lines. That may explain why some channels use more frequencies than others. I could be completely wrong about this, and would be curious to hear other theories.
By the way, I've found noise cancel to be pretty close to useless. I think it works well when you are trying to avoid a single specific frequency, like when working around another metal detector, but that most of the noise we encounter is pretty broadband in nature and the settings from one channel to another doesn't make much of a difference in most cases.
Chris
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Anonymous
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is willing to give out the info all of us would like to know, I guess all we can do in the meantime is keep on swinging and finding the good stuff others leave behind. Haven't really had occasion to use Noise Cancel for interference but always run through it before starting a detecting session. I usually detect alone so cross-talk from other detectors is not a problem for me. Perhaps there are others on this forum who have some insight about the operating frequencies/channel and would be willing to share. Until something definitive shows up, I wish you Happy Hunting and it's getting close enough to Thanksgiving to wish you a happy holiday. Jim <IMG SRC="/forums/images/35stars.gif" BORDER=0 ALT=";;"> <IMG SRC="/forums/images/ml.gif" BORDER=0 ALT="m~">
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Anonymous
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Hey Jim,
Wish the minelab folks would chime in more often. They do once in a while, but I suspect that that might involve giving away some secrets. Some day will glom onto an oscilloscope and play. Here's an entertainment value... Next time you noise cancel put the coil next to your headphone; while you are wearing them, you can hear the pitch change. Great fun.
happy hunting
Chris
Wish the minelab folks would chime in more often. They do once in a while, but I suspect that that might involve giving away some secrets. Some day will glom onto an oscilloscope and play. Here's an entertainment value... Next time you noise cancel put the coil next to your headphone; while you are wearing them, you can hear the pitch change. Great fun.
happy hunting
Chris
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Anonymous
Guest
I have on at my shop if I can remeber to take the detector with me.