Re: Harmonics and Relay Replacement
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Kees, and others....
Blindly changing relays may fix the problem, but are we missing something here? What is the real problem with the original relays?? Is it capacitive coupling between
RF carrying parts and the activation conductors, or is it that the relay coils might
be acting as RF chokes and allowing RF to be coupled between relays via the
RF-isolated traces of DC relay control leads?? Has anyone measured how much
is being carried by the DC control leads?? Has anyone tried bypassing the relay
control leads for RF?
Arv _._
Thanks for dissecting an AXICOM relay and the pictures. The coil mounted over the contacts is a definite difference to the ones I dissected.
The other thing which may effect results is that most of the larger (16 pin) relays offer up to 4 different "coil sensitivity" options .....which will effect coil resistance and inductance. The resistance for a given 12V relay coil varies between about 960 ohms and about 320 ohms. That may well effect the coupling also.
I don't have enough different relays to compare but I do have some series inductors to evaluate. The thing to watch out for there is the inductor self resonance effect.
73 Kees K5BCQ
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