T/R switches
 

I'm looking for a passive T/R switch for a noise canceller project.
The idea is to BYPASS the noise canceller circuit AUTOMATICALLY and
IMMEDIATELY upon transmitting, even when the noise canceller is turned
off. This is VERY important, because transmitting power into the
noise canceller could fry some of its components.

Are there places to buy T/R switches? Or must I build one myself?

Jason Hsu, AG4DG