ON7UI/Etienne wrote:
> Using Terman's approximitation (*) minimum bandwith = 2(23+68.4)= 182.8 Hz
> Decreasing the baudrate would decrease the bandwith.
> * F.E. Terman ,Radio Engineering, 3rd ed, Mcgraw-Hill. p486.
I just posted the computed spectrum (again, averaged over the equivalent
of 45 minutes of real time) of 22.725 Hz shift RTTY (I suspect they may be
using a shift that is synchronous to the baud rate of 45.45 baud).
Posted at:
http://homepage.mac.com/chen/.Public/RTTY/rtty23.pdf
Curious you should cite Terman. Fred Terman was still alive and very
active as Dean of Engineering when I was at Stanford. He was my advisor's
advisor's Professor :-). I am too many generations removed to have
inherited any knowledge from him :-).
I think Terman considered himself a "Radio Engineer." I was in the
Radar Astronomy group -- but don't ask me anything about Radar or
about Astronomy :-).
73
Chen, AA6TY
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