Tue Jan 05, 2021 4:02 am
Yeah, this will not work.
What will happen is one of the radios will be transmitting while other one is receiving. They will probably survive this, but there is no amount of filtering on normal boards that can reject another transmitter on nearby frequency.
To combine multiple radios like this, you would have to use two band-pass filters, each selecting just a channel(s) where one specific radio operates. This is for example how Audience splits the 5G band into low and high portions, feeding each part into different radios.
And if you may ask how more complex radio systems like cellphone towers or satellite links can share same antenna:
They use device called "circulator", it works as a one-way splitter for microwave frequencies.
So you split antenna into separate TX and RX ports and then combine them separately so the radios can't see each other.
So yes, this problem is solvable, but not in that simple way...