Has anybody tried to make a emi filter that goes in the coil lead of a pi detector

[6666]

Anybody tried to make a emi filter that goes in the coil lead of a PI detector, did it work for you ? I've been investigating it, but its not easy with out messing up the pulse and target signal.

[Carl-NC]

Commercially, the only thing that's ever done is a clamp-on ferrite choke.

[eclipse]

SD2200 has SMT ferrite bead in the RX soldered on the board.

[6666]

Commercially, the only thing that's ever done is a clamp-on ferrite choke.

Thanks, I have had a play with those clamp ons and had some positive results, there is a PI coil lead filter available here in Australia, but its expensive, would be interesting to see whats inside , my first guess is just a length of coax wrapped around a ferrite ring

[6666]

SD2200 has SMT ferrite bead in the RX soldered on the board.

Hi, thanks, would you know what part of the circuit they have added the bead ?

[eclipse]

There are 2 ferrite choke emi filters in the circuit (+2 more in the power supply).

[6666]

Thank you for posting the circuits .

[kt315]

first of all turn out your mobile smartphone in a time hunting. this will give you more effect than a choke using.