Real clone Alonso-PD

[Dubulumach]

WoW .... nice photo .
It taken exactly before 16 years, November 2007
Years gone....

Hi Geo
Make new photo with lrl. Nowdays.

[Geo]

I went for T.H 3 days ago but forgot to take some photos. Next time

[Pahom]

With ferrite "out" of coil is more easy to null the signal of passive receiver. But original Alonso;s PD is different.

What is the difference?

[Geo]

Inside the circle of coil is vedry very difficult to null the signal. If u have n't a very good null then u have saturation on receiver.... This is the big problem.

[Pahom]

Inside the circle of coil is vedry very difficult to null the signal. If u have n't a very good null then u have saturation on receiver.... This is the big problem.

Are you talking about zeroing the Tx signal relative to the Rx coils of the metal detector?

[Geo]

No, zeroing the Rx signal of passive receiver that becoming from Tx .

[Pahom]

No, zeroing the Rx signal of passive receiver that becoming from Tx .

Got it! Thanks Geo. It turns out that with such a system in a passive receiver you need to put transistors with h21 with a very high gain. In the Franco Italy scheme, it is recommended to put h21 not lower than h21-500. With what minimum gain do you use in the passive receiver Alonso or when using a stimulator, it is enough not lower than h21-500.