IDX-PRO+VDI

[Koala]

home made coil 27 cm

it tuned only with 33nf if i swapped TX wire very deep result for coin 45 cm but cannot reject frite
what is the correct connecting for coil?

Doughnut shape ferrite can't be used for testing. Solid rod or small fragment work well. I get just under 40 cm air test with a 27cm DD but that's unstable when tested over real soil. Better slightly less depth but stable in use.

[golfnut]

Minor typo in Dons post..

"36uF max" should read 36nF S

[golfnut]

1 If you can now reject ferrite using GEB control.
2 Then Try small clean iron - reject this with Disc.

3 Now try gold bronze silver etc

If all good then your done.

If you don't have the depth you require


Move the Rx cap value up or down . Now you have better air test RE DO 1,2,3 to confirm whether the phasing is still good.


If you have a pcscope you can SEE where the signals are IN TIME and the Tx signal and the preamp out signal should be 180deg out of phase wrt to each other.


You should build as design and get initial phasing right by moving Rx Tx coil in the housing

[ossamaussama]

my own board

[paku]

you make your one board you buy from silverdog

[ossamaussama]

home made coil 27 cm

it tuned only with 33nf if i swapped TX wire very deep result for coin 45 cm but cannot reject frite
what is the correct connecting for coil?

[paku]

what coil your ar using

[ossamaussama]

mu idx is tuned by 18 nf capacitor so it can reject frite ? why when i use 30--32 nf get good depth but cannot reject frite

[paku]

Get a board from silverdog, it will save some of your life

(facebook) Like

[golfnut]

Get a board from silverdog, it will save some of your life

[paku]

ok is that final version i download from here
hahaha

[Koala]

It is the pull up resistor for the mos switch for the PP .

Dont know what layout version that is, the 100k used to be next to the two PP wire holes and the resistor had to be mounted vertically to fit in. S

It's a very early board.

The resistor under the socket was moved in post 10

Without read through the thread again can't think of any other changes to the layout until the recent ones.

[golfnut]

It is the pull up resistor for the mos switch for the PP .

Dont know what layout version that is, the 100k used to be next to the two PP wire holes and the resistor had to be mounted vertically to fit in. S

[Thomas]

It would go on the bottom side and it is connected.

[paku]

hi can any one explain what is goin on this board have 100k but not connected