Is there interference suppression filter scheme?

[refref]

Do you have a pulse induction devices Noise filter scheme?

[Davor]

Doing what exactly?

[kt315]

learn Double D coil, for using in PI systems. use SEARCH engine of this forum for looking of the matter threads.

[refref]

There are fluctuations in the signal.

[DOOLEY]

Are the " fluctuations " as regular as clockwork ????
Say,
At one second intervals ???

Been mentioned on here before about testing inside ,
Interference from other electronic equipment.

Anything from quartz controlled clocks nearby to boiler clocks,
Or just plain old house wiring 50 / 60 Hz " beating " against you're pi's
Pulse frequency.

Alter pulse frequency,
See if it changes............

[kt315]

what detector? what frequency (PPS)? you do not wish to say full info and think pollution extrasencories around you everywhere.