RF trap

[Anonymous]

Does anyone put an RF trap between the coil and the clamp diodes? In looking at the amplifier output I see both RF and audio that has already been demodulated. I am assuming that the RF is partially demodulated by the clamp diodes. Some of the audio is going to be within a few Hz of the sampling frequency and therefore it cannot be filtered out by any method. It would be nice to get rid of it while it is still RF and before it becomes audio.
Robert

 

[Anonymous]

i have noticed broudcast band leekage in the past
and found a ferrite sleave or ring 5mm with 10 T 1mm wire {i just used hookup cable 1mm} was enough to attenuate it to the point it wasnt a problem i used a 1. mhz T type core {think was a t30-2 {30 mm 1mhz}
also in the past to wash it off