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Listen before transmitting?



The Weekly Satellite Report under AO7 says:

Listen before transmitting!

Is there some kind of "listening" one should be aware of??.

We learned that 80 years ago in ham radio....That applies to any 
am/ssb/cw/fm modes, even if transmitting "in the blind" in an emergency....

All sorts of weird ideas floating around now???



            73, Dave, WB6LLO
                dguimon1@san.rr.com

                    Disagree: I learn....

               Pulling for P3E... 

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