BK sent as a procedural .... was originally brought about by the conversion of 
stations to automatic control of changeover from xmit to rx... with seperate 
rx/tx and no controling assistance, it took some time to cut the high voltage 
from the tx, change the antenna feed to the rx, and unmute the rx. Then when 
the other fellow was done, and sent his "k", the reverse had to be done... the 
prosign "BK" was used to let the other station know that you had fast 
changeover and he could start talking right away... rather than wait until he 
figured the changeover had been made.   That one prosign speeded up 
converstaions a whole lot.  Now.. no one needs use it.. as everyone but the 
brave, have xceivers that changeover very fast. Have a great day, 

--...   ...--
Dale - WC7S in Wy
                                          
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