> The quadrature hybrid itself should only be 3 dB theoretically, > typically around 3.2 dB in the real world. It's the external > circulators that need to be added to get the necessary isolation > that bumps it up to around 4 dB.
Yep, the overall package has much resultant baggage. > You can do productive things with the hybrid's reject port power; > it doesn't have to be connected to a dummy load. You can put an > isolator on it (to guarantee a good match to keep the hybrid's > isolation up), and feed the output to another antenna, such as > a corner reflector on the back-side of the tower to fill in the > nulls of your side-mounted omni. Waste not, want Now that's a neat idea... I'll file that in my head and claim local credit for it when no one here is paying close attention. Unless someone is really trying or just gets really lucky... it's my opinion the nulls from a side mounted omni shouldn't be that deep if it's properly offset from the tower/pole. Yeah... there would be viable applications where the main tx uses a corner reflector or similar directive antenna system and the otherwise wasted hybrid port power could be used to feed something directional the other direction. > not like my grandmother used to say. But make sure the IM > products are suitably attenuated; ferrites are non-linear devices > so they will create IM when passing two high-level signals. Quality bandpass cavities with sometimes optional harmonic filters are the bacon saving hardware. > Or, you can connect the reject port to a dump load to make a > nice warm place for mice to build a nest :-) > --- Jeff That's what the old user installed Tripp Lite Power Supply is for. How much crap can a mouse stuff into it before it fails. cheers Jeff, skipp
