[digitalradio] added comment

[Edward]

google or search "spread spectrum". the term speaks for it self. FREQUENCY 
hopping several times per second. the receiver tracks it. specially built 
radios. military first used it to foil the enemy on eaves dropping. now it is 
used commercially. ham radio freq does not change, just the mode of operation. 
how wide? i don't know. that's why i'd like to know the freqs so i can listen 
and come to my own opinion.
ed-ki4urn