Topband: CY9C

[Jim Brown]

On 9/7/2024 11:17 AM, Rudy Bakalov wrote:
> How does this work? IF this is indeed the case, this would be a great solution for multi-op contest stations.

Very careful design of both RX and TX antennas and their matching 
networks, physical separation of RX and TX antennas, combined with very 
careful design of very narrow-band pass and reject filters for RX, and 
combiner networks for TX that prevent each TX from seeing the other. 
Combining networks for TV and FM broadcast transmitters have been in 
common use in major cities for more than half a century at sites like 
the Empire State Building, the World Trade Center, Chicago's Hancock 
Building and Sears Tower, and mountaintop sites in the West.

Very complex design of both the system and individual components. As one 
of my old EE profs would say, "non-trivial!"  Uses everything I learned 
in EE 60+ years, and at a much higher level than I ever did anything. :)

73, Jim K9YC