Auto GEB system

[golfnut]

Anyone got any ideas for tracking ground balance automatically?

I had a shocker in the summer on mineralised ground. I was only getting 3 1/2" inches.
When I accurately set GEB - this went to 9".


Prerequisites may be...

1) A long time constant, narrow filter in the GEB channel - in order to not respond to targets during sweep.

2)During cal/capture - holding a button would widen the filter response, speed system up - to make it faster to assess and track GND signal.

3)Post cal/capture - button release narrows the GEB ch filter to ~5-10 sec time constant to not "see" target response.



Thoughts - Block Diagrams , principles, architectures (not circuit diagrams) ?

S

[nejdet]

Hi there. I wanted to experiment with something. I have some ideas I want to share one of them with you

[Sergey_P]

http://www.md4u.ru/viewtopic.php?f=77&t=5408

[SGS]

The simplest variant is one microcontroller and one digital potentiometer. Also, you can adjust track speed

[Skippy]

In one of George Payne's tech articles, he mentions adding tracking GB to old Tek machines, what he did to overcome 'tracking off' over large targets etc, might be worth a read.

[satdaveuk]

Hi Golfnut
The auto GEB has always given problems in hi mineralised grounds such as the UK.
What happens is quite simply the GEB starts seeing the mineral as the ground hence why you were losing so much depth.
There nothing wrong with GEB if you reguarly reset on virgin ground, and thats where if your machine has a signa graph to display it comes into a world of it own because you can measure the mineral and have it as a constant indication
Ive found with the DFX if you groundbalance in the normal way, then slightly detune so you can acually hear the ground as a target you get better feedback to whats happening around you and know when its drifting out, but must bare in mind on the DFX theres a mutitude of setting that compensate this, actually 44 settings that relate to ground balance and overall machine performance and that doesnt incl the normal pre factory modes.

Regards

[golfnut]

I dont have Auto GEB and would like it

Sorry Dave, I wasnt clear, I dont have Auto GEB.


I was using my Geotech IDX - manual GEB.


I would maybe like to figure out a tracking balance to help things.

Steve

[ivconic]

Hi Golfnut
The auto GEB has always given problems in hi mineralised grounds such as the UK.
What happens is quite simply the GEB starts seeing the mineral as the ground hence why you were losing so much depth.
There nothing wrong with GEB if you reguarly reset on virgin ground, and thats where if your machine has a signa graph to display it comes into a world of it own because you can measure the mineral and have it as a constant indication
Ive found with the DFX if you groundbalance in the normal way, then slightly detune so you can acually hear the ground as a target you get better feedback to whats happening around you and know when its drifting out, but must bare in mind on the DFX theres a mutitude of setting that compensate this, actually 44 settings that relate to ground balance and overall machine performance and that doesnt incl the normal pre factory modes.

Regards

I see that you mastered DFX well! Same phylosophy is relevant for other White's machines from those series.
...
Auto Geb works splendid in theory, under some simulations etc...
But so far i haven't seen neither one machine to perform very well in Auto GEB (Autotrack) mode on real soil.
Not even his majesty the Deus.
Autotrack is usually too slow and most of the time restictive.
Experienced and succesful users are always working using manual GEB adjustments. Otherwise they are skipping many good targets.
I think that most interesting thing we can try to resolve here should not be Autotrack - but realtime and fast GEB monitoring; exactly the same as it is done at Deus.
I found it as most usefull and helpfull feature at Deus.
So; goal would be to design GEB monitoring circuitry which will constantly "read" ground signal and indicate it on LCD display using cyphers.
User than will observe those cyphers and if needed will manually readjust GEB knob to suit present soil conditions.
Such design can be made in manner of stand alone addition to already existing detectors, simillar to VDI we have here as project on forum.
Indication can be LCD with cyphers, symmetrical VU scale, additional background audio channel (low tone bellow zero, high tone above zero, adjustable zero width) etc...

[golfnut]

I see that you mastered DFX well! Same phylosophy is relevant for other White's machines from those series.
...
Auto Geb works splendid in theory, under some simulations etc...
But so far i haven't seen neither one machine to perform very well in Auto GEB (Autotrack) mode on real soil.
Not even his majesty the Deus.
Autotrack is usually too slow and most of the time restictive.
Experienced and succesful users are always working using manual GEB adjustments. Otherwise they are skipping many good targets.
I think that most interesting thing we can try to resolve here should not be Autotrack - but realtime and fast GEB monitoring; exactly the same as it is done at Deus.
I found it as most usefull and helpfull feature at Deus.
So; goal would be to design GEB monitoring circuitry which will constantly "read" ground signal and indicate it on LCD display using cyphers.
User than will observe those cyphers and if needed will manually readjust GEB knob to suit present soil conditions.
Such design can be made in manner of stand alone addition to already existing detectors, simillar to VDI we have here as project on forum.
Indication can be LCD with cyphers, symmetrical VU scale, additional background audio channel (low tone bellow zero, high tone above zero, adjustable zero width) etc...

Sorry Ivconic - your post appears to contradict itself ??

Auto GEB is not good, Auto GEB is actaully quite good..

I can imagine taking a long time average is the least useful as you are Geb is balance fram old history, not where your coil is!

So a real time system is favourable..


Any block diagrams - nice and simple like

S

[ivconic]

Sorry Ivconic - your post appears to contradict itself ??

Auto GEB is not good, Auto GEB is actaully quite good..

I can imagine taking a long time average is the least useful as you are Geb is balance fram old history, not where your coil is!

So a real time system is favourable..


Any block diagrams - nice and simple like

S

?? What is contradictory in my post?