Well, I shielded the Coil, besides the Cable.
Board Shield Pin -to- Cable shield -to- Coil Shield.
But its still Chattering like Morse code: beep beeeppp beep beep beeeep ...
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I think the Shields can Touch - without any problem - because they are bothy still tied to GND.
But, I think there needs to be a Shield Between the TX and RX signal Wires.
I have the RX Wires Shielded, but the TX Wires Cable are not.Leave a comment:
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The Tesoro Bandito I just bought uses a cable with 2 conductors and sheild and another 2 conductors and shield but
the shields are touching in the cable and they use the sheilds for one side of the TX thus the RX has the TX energy
all around it! It seems they should have used 2 sheilded conductors for TX and 2 for RX and a seperate chassis ground
for the shield....Leave a comment:
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I am saying TX should be shielded isolated from RX, otherwise there wil be crosstalk - I assume.
That is my point - I think it should be (2) Shielded Cables - one shielded cable for TX pair , and one shielded casble for RX pair.Leave a comment:
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Just a thought....
My apologies, Iam sort of butting in here, I do not have an IDX-Pro machine....Originally posted by ampirate View Post
Is it possible to change from possibly 4 wires in a single shielded cable, to 2 x 2 wires in two shielded cables and test the difference, WITHOUT MAKING ANY OTHER CHANGES? Maybe that will help to quieten things down?
Also connecting shields only once at the electronics end, not twice (at both ends for example).....
As the shields may touch IN the search head, then both should be connected only once to the same shield I feel, no ground loops, though the next time I make a coil (IGSL), I will make sure that the coil shields do not touch and connect each one to the same shield as the coil its feeding.....next winter I expect, once I have made the "Davor" changes as well.....
Just a thought, what happens if the coil shields are "cross" connected.....I would expect problems, but am I right!!!
Regards
Andy.
PS. All wires separately shielded?Leave a comment:
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Okay,
I found a stupid little problem , I found with the Oscilliscope.
I had made a new set of Coils and wired them backwards yesterday.
So coil TX went to board RX , and coil RX to board TX.
Still gave half reasonable responses though ...
Rewired that and I am back to 16V p2p TX, and 1V p2p RX at about 6.3khz,
but still have a chatter problem - though.
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Chatter problem :
1. Sensitivity and Threshold do Not seem to affect the Chatter , but they do affect the Target Range
2. The Project plastic Box does seem to have some effect - chatter changes if I raise the board from the box - capacitance ?
Is a Metal Project Box needed ?
3. Caps of 2mf across the TX Coil does Not remove the Chatter.
4. Low Pwr Voltage causes Chatter like 9V source is not enough.
5. Chatter is not immediate, starts after half minute of warmup after power on.
6. Chatter is random like: click click hiss buzzz click buzzz hisspause ... ,
but once in the while comes out like a constant beat of buzzes - buzzz pause buzzz pause buzzz ...Leave a comment:
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I am confused with this persistent Chirping problem.
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I do find an odd situation that I want to Question though ...
Why does the COIL and CABLE Instructions specify to have the TX Wires directly adjacent to the RX Wires within the SAME Shielded Cable ?
Why Shield the TX and RX lines if they are Not Shielded from EACH other ?
Doesn't this provide an obvious and Direct Interference crossover Problem ?
I pulled the TX lines out from the Shielded Cable - leaving ONLY the RX Wires within the Shielded Cable.
And, this got rid of a LOT of the Chatter !
I have been wondering why this Chattering problem seemed to start - after I added the Shielded USB Cable Solution ...
Maybe this is a cable problem to keep in mind ... ?
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I tried adding a second Cap to the TX Coil, giving 2mF on there now.
Got rid of a little more noise and increased the range a little.
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Still debugging though...Leave a comment:
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ampirate, add extra cap to you tx to go to about 7k and see if any better.. may need to tweak rx cap for some sense,, then try reject ferrite,, take vdi off for this.
get you coils sheilded etc to move forward..Leave a comment:
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Now I try to attach the ground wire the better, but to me is that every so often does make the false signal.
Leave a comment:
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to me by some false signal, I tried to turn up the ground but I can not solve, however I work I always sensitivity 'maximumLeave a comment:
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I already have the Lf347 chip in the project. So that is not the problem.
It likes to go off into chattering modes.
Even targets do more than a Chirp - often a target sweep causes a half or one second chatter.Leave a comment:
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LF347. more sensitive better, I do not understand geotech 100 paguinas idx pro and even you have not settled
Leave a comment:
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Thanks, I'll try replacing the Lmc6484 with a Lf347 tomorrow.
Below is example of results at the moment, after rewiring the Gnd :
- As you can see, the chatter is horrible.
- The VDI=0=88 etc - is (2) equations;
- - first is the Average of all individual Slopes=R/X,
- - second is the Slope of the Averages Ravg and Xavg so VDI=Ravg/Xavg. sounds same, but different results.
No Target :
X=9.72,R=10.84,VDI=86=88,Quarter
X=7.62,R=10.12,VDI=86=86,Quarter
X=4.91,R=5.46,VDI=0=88,Null
X=5.46,R=7.94,VDI=83=85,Dime
X=3.65,R=10.26,VDI=0=71,Null
X=24.71,R=4.80,VDI=0=98,Null
X=7.52,R=9.12,VDI=0=87,
X=6.09,R=6.24,VDI=89=89,Quarter
X=3.58,R=8.11,VDI=0=77,Null
X=5.55,R=8.61,VDI=82=84,Dime
X=11.75,R=4.62,VDI=0=96,Null
X=9.72,R=9.52,VDI=89=90,Quarter
X=1.58,R=4.42,VDI=0=71,Null
X=4.47,R=2.61,VDI=0=94,Null
Steel Scissors :
X=8.14,R=10.61,VDI=86=86,Quarter
X=4.66,R=8.98,VDI=0=80,Null
X=10.25,R=12.85,VDI=86=87,Quarter
X=1.02,R=15.81,VDI=0=-54,Null
X=9.47,R=30.53,VDI=67=67,?
X=12.93,R=18.05,VDI=86=86,Quarter
X=21.00,R=42.52,VDI=74=79,Penny
X=30.95,R=32.07,VDI=89=89,Quarter
X=10.64,R=3.19,VDI=0=97,Null
X=11.19,R=13.33,VDI=88=88,Quarter
X=6.96,R=22.27,VDI=62=68,?
X=15.89,R=3.20,VDI=0=97,Null
X=8.72,R=27.01,VDI=68=69,?
X=21.67,R=17.60,VDI=0=91,
X=4.82,R=17.61,VDI=50=63,Null
X=10.01,R=28.96,VDI=69=71,?
X=15.36,R=5.09,VDI=0=96,
X=5.81,R=10.08,VDI=0=82,
X=3.95,R=5.45,VDI=0=86,Null
X=3.86,R=4.13,VDI=0=89,Null
Steel Washer :
X=6.65,R=13.35,VDI=77=79,Penny
X=1.14,R=7.06,VDI=0=38,Null
X=6.20,R=11.53,VDI=0=81,
X=14.08,R=14.07,VDI=90=90,Quarter
X=3.68,R=4.82,VDI=0=86,Null
X=7.54,R=8.05,VDI=88=89,Quarter
X=3.25,R=7.42,VDI=0=77,Null
X=5.47,R=8.84,VDI=82=83,Dime
X=2.53,R=8.01,VDI=0=68,Null
X=8.76,R=7.85,VDI=90=91,Quarter
X=18.60,R=6.13,VDI=0=96,
X=6.01,R=7.29,VDI=0=87,
X=4.73,R=7.16,VDI=0=84,Null
X=10.73,R=14.34,VDI=0=86,
X=8.68,R=8.80,VDI=88=89,Quarter
X=4.60,R=4.04,VDI=0=91,Null
Iron Screw :
X=9.00,R=22.25,VDI=74=75,Penny
X=10.53,R=5.12,VDI=0=95,
X=6.71,R=22.35,VDI=66=66,?
X=13.84,R=30.54,VDI=76=77,Penny
X=12.96,R=12.59,VDI=90=90,Quarter
X=9.86,R=8.89,VDI=91=90,Quarter
X=5.47,R=5.20,VDI=0=90,
X=8.04,R=12.16,VDI=84=84,Dime
X=8.61,R=7.84,VDI=89=90,Quarter
Aluminum Tube :
X=3.89,R=12.69,VDI=0=67,Null
X=16.66,R=6.52,VDI=0=96,
X=17.72,R=10.66,VDI=91=93,Quarter
X=97.96,R=11.26,VDI=0=98,
X=59.12,R=8.25,VDI=97=98,Quarter
X=39.15,R=9.27,VDI=0=97,
X=21.04,R=6.80,VDI=95=96,Quarter
X=46.93,R=16.20,VDI=94=96,Quarter
X=3.00,R=5.96,VDI=0=80,Null
X=8.13,R=5.79,VDI=89=92,Quarter
X=2.36,R=3.05,VDI=0=87,Null
X=46.72,R=12.60,VDI=96=97,Quarter
X=7.76,R=4.36,VDI=0=94,Null
X=8.79,R=5.21,VDI=0=94,
Aluminum Foil :
X=7.96,R=5.75,VDI=0=92,
X=13.93,R=11.19,VDI=0=91,
X=28.92,R=5.71,VDI=0=98,
X=14.38,R=13.29,VDI=0=90,
X=3.04,R=3.02,VDI=0=90,Null
X=10.96,R=12.20,VDI=0=88,
X=8.72,R=9.66,VDI=0=88,
X=24.49,R=4.86,VDI=0=98,Null
X=7.89,R=10.06,VDI=0=87,
Aluminum Wire :
X=7.96,R=5.75,VDI=0=92,
X=13.93,R=11.19,VDI=0=91,
X=28.92,R=5.71,VDI=0=98,
X=14.38,R=13.29,VDI=0=90,
X=3.04,R=3.02,VDI=0=90,Null
X=10.96,R=12.20,VDI=0=88,
X=8.72,R=9.66,VDI=0=88,
X=24.49,R=4.86,VDI=0=98,Null
X=7.89,R=10.06,VDI=0=87,
X=17.60,R=10.11,VDI=94=94,Quarter
X=2.86,R=1.02,VDI=0=96,Null
X=8.11,R=3.15,VDI=0=96,Null
Brass Foil :
X=3.56,R=4.45,VDI=84=87,Null
X=44.40,R=6.25,VDI=0=98,
X=8.47,R=6.44,VDI=0=92,
X=19.64,R=4.32,VDI=0=97,Null
X=1.96,R=2.96,VDI=0=84,Null
X=5.45,R=3.96,VDI=0=92,Null
X=13.40,R=4.81,VDI=96=96,Null
X=2.20,R=12.89,VDI=0=41,Null
X=17.98,R=4.35,VDI=97=97,Null
X=4.71,R=3.02,VDI=0=93,Null
X=4.07,R=1.04,VDI=0=97,Null
X=4.92,R=9.84,VDI=0=80,NullLeave a comment:
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