
MSG LEFT BY: SYSTEM OPERATOR
DATE POSTED: 

OK,HERE TIS SOME BASIC SATELITE TELCO
TUTORIALS NEVER BEFORE WRITTEN!
 
FIRST OF ALL EVERY SATELITE HAS 24
TRANSPONDERS EACH 36 MHZ WIDE.
INDIVIDUAL TELCO CARRIERS ARE 4KHZ
WIDE.THE VOICE/DATA CARRIER IS USED
TO MODULATE A DOUBLE BALANCED MODULATOR
WHERE ONE OF THE 2 SIDEBANDS TIS ELIMIN
ATED WITH A FILTER.THE REMAINING SIDE
BAND SIGNAL IS APPLIED TO ANOTHER
CARRIER FREQUENCY BETWEEN 64-108 KHZ.
 THESE CARRIERS ARE THEN MULTIPLEXED
TOGETHER IN GROUPS OF 12.SUPERGROUPS
CONTAIN 5 GROUPS AND MASTERGROUPS
CONTAIN 5 SUPERGROUPS.(300 CARRIERS)
 THESE ARE THEN SENT VIA SATELITE IN
"PACKETS" CONTAINING EITHER GROUPS,
SUPERGROUPS,OR MASTERGROUPS IN THE
0 TO 10.75 MHZ RANGE ON A TRANSPONDER.
MASTERGROUPS ARE 5 SUPERGROUPS MULTIPLE
XED AND 1 MIXING CARRIER PER SUPERGROUP
 WHICH ARE UPLINKED BY THE TOC(TOLL
OPERATIONS CENTER) LOCATED IN VARIOUS
AREAS OF THE U.S.
 BLOCK CONVERSION IS USED TO EXTRACT
GROUPS DURING DOWNLINKING.
 
CONTINUED NEXT MSG
