Did BFO can ???

[GOLDENSKULL]

Hi,

I want design one BFO MD with Micro,
but i can some question?

Did BFO MD can detect in depth 2-3 meter with 1*1 or 2*2 search coil?
Did we can trust on this device to find metals in these depth?
I also want add discrimination to my design and have some idea...
what is your idea?

thanks...

[Geo]

I don't believe that you can take this depth even you will use 2x2m coil. Why you don't try a PI with a big coil???

[aft_72005]

Hi,

I want design one BFO MD with Micro,
but i can some question?

Did BFO MD can detect in depth 2-3 meter with 1*1 or 2*2 search coil?
Did we can trust on this device to find metals in these depth?
I also want add discrimination to my design and have some idea...
what is your idea?

thanks...

Hi GULDEN SKULL
Bfo with large coil doesn't perfect at the deep you said .also has poor discriminating .
If your decided, build professional detector , Don’t waste your time with bfo .
But maybe exercise with micro , it is good ,

[GOLDENSKULL]

I don't believe that you can take this depth even you will use 2x2m coil. Why you don't try a PI with a big coil???

Hi Geo, why we can not reach to this depth with one BFO ?
What is your argument ?

Hi GULDEN SKULL
Bfo with large coil doesn't perfect at the deep you said .also has poor discriminating .
If your decided, build professional detector , Don’t waste your time with bfo .
But maybe exercise with micro , it is good ,

Hi aft_72005, we know that inductance one BFO MD change by near a metal object, if i say correct, ferrous metals decrease BFO circuit frequency and none ferrous increase BFO circuit frequency,with programing a micro we can reach to many benefits, ever we can add ground balance feature to this device, but the problem is that in what distance a medium size of metal can effect to search coil? and what modification in one schematic BFO is needs to reach to this purpose ???
I have some idea to improve BFO MD...
Did you any experience with BFO search coil section ?
Have you any good idea ???

[aft_72005]

Yes, with micro you can build detector sensitive to any small frequency changes
Also around some HZ . but is not reason , we saying , reach to maximum deep .
This detector doesn't work at practice on the ground . it will be with full false
Signal .
About bfo coil , surely it need good faraday shied. Assumed ,how can you doing
In large scale?
Yes, I had experiment and practice with BFO, my first bfo was build approximately
20 years ago . my good idea , only it is early , good for beginners . Doesn't perfect
For professional .

[GOLDENSKULL]

Yes, with micro you can build detector sensitive to any small frequency changes
Also around some HZ . but is not reason , we saying , reach to maximum deep .
This detector doesn't work at practice on the ground . it will be with full false
Signal .
About bfo coil , surely it need good faraday shied. Assumed ,how can you doing
In large scale?
Yes, I had experiment and practice with BFO, my first bfo was build approximately
20 years ago . my good idea , only it is early , good for beginners . Doesn't perfect
For professional .

Hi aft_72005,
Thus you say BFO is not good MD for building and experience?

what is your idea to make what kind of MD to reach at least 2-3 meter depth ? T/R ? PI ? or ...?

[aft_72005]

No, bfo is good . but about deeper and discrimination detector , never compare it with other type . for good discrimination ,VLF and deeper detectors PI and TR
In the matter pi or t/r can be good choose

[GOLDENSKULL]

No, bfo is good . but about deeper and discrimination detector , never compare it with other type . for good discrimination ,VLF and deeper detectors PI and TR
In the matter pi or t/r can be good choose

I design one oscillator to get test it with a coil as BFO MD... I told you results later...

for building good PI MD, what MD is better for build, white surfmaster pi or any other better PI for choice ?

what is best T/R MD for building?

[Carl-NC]

BFO has no ability to ignore mineralization. As you make the coil bigger and try to go deeper, the ground causes more problems.

[detectoman]

bfo is great auxilar, excellent for ignore little object, trash, but whit coil regular, i spoke of bfo whit bc548, not bfo whit t, jfet

[aft_72005]

I design one oscillator to get test it with a coil as BFO MD... I told you results later...

for building good PI MD, what MD is better for build, white surfmaster pi or any other better PI for choice ?

what is best T/R MD for building?

Hi GULDEN SKULL
There are many circuit at this forum about pi or tr .
I cannot say you " which of them , the best"
You should select from what's your requirement
Best regards.

[GOLDENSKULL]

Hi GULDEN SKULL
There are many circuit at this forum about pi or tr .
I cannot say you " which of them , the best"
You should select from what's your requirement
Best regards.

Thanks aft_72005,

Did anyone know, that white's surfmaster pi with large coil is good deep MD for building?

[WM6]

Thanks aft_72005,

Did anyone know, that white's surfmaster pi with large coil is good deep MD for building?

Sure it is good deep MD.

How deep are you willing to dig?

[GOLDENSKULL]

Sure it is good deep MD.

How deep are you willing to dig?

Hi WM6,

I want to dig at least 2-3 meter...
Did white surfmaster pi can detect a medium metal object in 2-3 meter
depth ?

[Geo]

Hi WM6,

I want to dig at least 2-3 meter...
Did white surfmaster pi can detect a medium metal object in 2-3 meter
depth ?

For big coil construct the Delta Pulse with a 1x1 or 2x2 m coil.
Very good and stable detector for large objects at big depth. Also you can Try the (PS-G lite clone) from Georgi Zhelev, it has one kind of discrimination and it has designed better for big objects at big depth.