[BC] What brought me into radio

[Gary Peterson]

I recall asking someone that had worked in military HF communications about those strange sounding signals.  He told me that it was "mux."  Something like 24 encrypted teletype channels multiplexed together.
 
Gary

 
"I thought I was the only one to hear multi-engine planes running with 
open mikes.   They couldn't even get those engines in sync with each 
other.
Don R"
 
>> My biggest curiosity was the airplanes, which there were several 
> across the bands. Obviously they were airplanes, because you could 
> hear the sound of the engines, but only the sound of the engines.