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put scope on the coil today and hard to tell if it transmit all frequency's at one hit or very close to each other, on multi frequency scope read 5.32, 10.2, 15.7, 20.1, 40khz and every now and then threw up 32.5khz but that could just be the scope. very square wave pattern, on single frequency mode depending on which frequency you pick that's is all you get. on beach mode-1 you only got 5,10,15khz. I did try and capture screen but , it did not save them for what ever reason so I will try and sort that and post pic up
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That is interesting, particularly the observation that beach-mode only uses the lowest freqs. There must be some benefit to dropping the highest freqs from the Transmit signal, if they are not needed by the Receive side.
Because of the 'square' waveform, your scope is likely to be identifying 3rd harmonics, hence the 32KHz (caused by the 10KHz). There may be a 45KHz hiding in there, too, to fool you.
Which model do you have, the 600 or the 800?Comment
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You need to look at the coil current, not the voltage.Comment
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does anyone know the muti frequencies coming out of the coil from each mode such as field 1=?,field 2=?, gold 1=?, gold 2=?, beach 1=?, beach 2=?....Comment
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Thank for that, well it gives me an idea of how it comes apart. HaroldComment
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Actually, using any kind of coil as a pickup will reveal what kind of voltage is applied to the coil. Pick any coil, even a makeshift, and connect it to a scope.Originally posted by Carl-NC View PostComment
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How's it going, Chiv ? Any update on your experiments?Comment
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have not done too much with the nox800 only the occasional beach swing, have been picking up the old 1 cent pieces that every one is missing, the machine dose struggle in very heavy mineral sands(have talked to minelab with their guru) and has given me some help but it still can get up set with the soil, even my barra struggles real bad on this particular beach, as for pulling this machine apart to see what's in side, I see that you most likely brake it as it been welded together apparently. throw away job if it craps it self, so I have been told, but hopefully it dose not happen. One the up side targets for coins and chains tend to be reliable numbers most time for id but I dig every thing just to check and clean the rubbish away, will be in the red dirt country in afew days to test it out. the misses and I have one each and it is very surprising how close we can work together on dry sand(with in a meter or so) but in wet sand I can get signal every now and then for 10meters away but most times 2meters apart will still be quite. still got a lot to learn about this machine, but there is afew flaws with the machine (loose shaft mounts feel in the swing, locking collars tend to flex if tighten up to much) finished product but nothing that a good operator can look after. All in all a real light machine to swing done afew 6 hour swing and the misses can keep up to, so happy with it so far for the price you pay for a commercial product, but it still not the same as using some thing you have built and find some thing with it
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plenty of stuff on this in dedicated forums for the exquinox seiresOriginally posted by erte123 View PostComment
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I will do this when I get back home from road trip, been away for abitOriginally posted by Davor View PostComment
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i was looking for these dedicated forums but can't find the specifics i'm looking for can you pm me the link...Originally posted by Chiv View Post
anyways wanted to know the specifics similar to how this whites detector was tested in this video:
https://www.youtube.com/watch?v=D1GCaNdGUWUComment
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https://www.minelab.com/__files/f/32...20800%20EN.pdfOriginally posted by erte123 View Post
page 28 will help you out.
Well found out to day the eq800 dose not like the barra with in 10meters of it as it went on a real song and dance, played some real interesting sounds. But the barra could handle it with in a 2meter zone. also if the phone is searching for a signal it up set the eq800 too, more stuff to look into
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ok put small coil on eq800 coil put on multi park setting and took pick but I not versed in what to look for
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All that sinusoidal ringing looks like a result of some low-pass filtering, with a steep cut-off. Are you using a Harbin "Instrustar" USB scope??
Are you using another detectors RX coil as your pick-up loop? I'm wondering if some resistive load on the coil's output may help.
IComment
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yep instrustar scope usb type, coil was and old bucking coil pulled out of a Chinese toy detector , I will work on getting a single 5kh sig down pat and then work on multi frequency pic later, have to happen next week as driving across paddock tomorrow so be 6days of driving before I get to play with detector againComment
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