Announcement

**mustefa ubram** · 08-03-2014, 06:54 PM

Originally posted by WM6 View Post

By controlling transmit power you imply mainly to induced amplitude in RX coil, but at the same time to damping useful signal too. So this is not real solution. But in principle we do not need big power too.

By adjusting RX coil (coil on ferrite rod) position in regard to TX coil position is right approach.

In fact you need to null out TX signal from your RX front-end (RX coil) much like we do in case of IB DD coils.

For better results RX windings on ferrite should not be to long. Ferrite centered to TX coil position. Best to make 2 or 3 TX coil with different diameter and chose combination with best results.

Your drawing is excellent basis to represent this nulling procedure:

tank you very much wm6
wm6 Require a specific frequency for finding non-magnetic metals?for example gold frq X or silver frq Y?Or with a frequency non-magnetic metals can be revealed?

**FrancoItaly** · 08-04-2014, 10:18 AM

Hi Mustefa
If I remember well the ferrite has 2 coils in series to get a null point.

Best Regards

**mustefa ubram** · 08-04-2014, 12:54 PM

Originally posted by FrancoItaly View Post

Hi Mustefa
If I remember well the ferrite has 2 coils in series to get a null point.

Best Regards

tank you franco
Can you explain a little more about it?
for example:» How is it possible to use two coils in nicolas circuit use of 2 coils in series to get a null point?
What is your mean?

Attached Files

**nelson** · 08-04-2014, 03:55 PM

To null two coils you need a passive receiver and also the transmitter.
The pdk schematic you show is from pdk passive receiver (one coil) The second coil is for the transmitter is not show in this schematic.

**mustefa ubram** · 08-04-2014, 06:09 PM

tank you freinds
one question :
Require a specific frequency for finding non-magnetic metals?for example gold frq X or silver frq Y?Or with a frequency non-magnetic metals can be revealed?

**WM6** · 08-04-2014, 06:49 PM

There is no such differentiating frequency.

**mustefa ubram** · 08-05-2014, 05:52 PM

Originally posted by WM6 View Post

There is no such differentiating frequency.

Today I built a passive receiver.I was able to reveal a gold ring at a distance of 10 cm.I could detect a iron the same frequency.What do you think?

**king40** · 08-05-2014, 06:05 PM

One question here is :
What is the relationship between tx and rx ?
Tx stage must generate special frequent until Rx works?

**WM6** · 08-05-2014, 09:50 PM

Originally posted by mustefa ubram View Post

Today I built a passive receiver.I was able to reveal a gold ring at a distance of 10 cm.I could detect a iron the same frequency.What do you think?

You successfully build IB detection prototype. There are always space for improvement.

**mustefa ubram** · 08-06-2014, 04:02 PM

Originally posted by WM6 View Post

You successfully build IB detection prototype. There are always space for improvement.

What I need to do is just practice for the detection of non-magnetic metals?
Whether need a certain frequency?
Please help me in this regard

**mustefa ubram** · 08-06-2014, 05:36 PM

What I need to do is just practice for the detection of non-magnetic metals?
Whether need a certain frequency?
Is my understanding of how it works of passive reciver and transmitter?(As shown in Figure)
Please help me in this regard

Attached Files

**anonymouse** · 08-07-2014, 05:44 AM

Hi Dear Mustefa

please share your passive detector information to all,

best regards

**Nicolas** · 08-08-2014, 04:35 PM

Hi dear Mustefa
If you need use an transmitter with the part of Alonso passive receiver.

I advice you to add the transmitter designed by our Colleagues Andreas in her Clone Alonso PD Is so better

Look in her Topic this

Real clone Alonso-PD - LongRangeLocators Forums

http://www.longrangelocators.com/forums/showthread.php?t=18956