OK, HERE IS SOME BASIC SATELLITE TELCO TUTORIALS.
 
First of all every satellite has 24 transponders each 36 mhz wide. Individual 
TELCO carriers are 4 khz wide. The voice/data carrier is used to modulate a 
double balanced modulator where one of the 2 sidebands limited 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 
containing 5 groups and mastergroups containing 5 supergroups. (300 
carriers).

These are then sent via satellite in "packets" containing either groups, 
supergroups, or mastergroups in the 0 to 10.75 mhz range on a transponder. 
Mastergroups are 5 supergroups multiplexed 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. Then the group is 
microwaved via terrestial microwave circuit to thedestination TOC which 
demodulates the group using a lower sideband receiver. The carriers are then 
sent to their final destination via leased TELCO line or radio circuit. SCPC 
(single channel per carrier) may operate by themselves or by slotted next to 
groups. These are 60 khz wide within 65 to 85 mhz.

As small as a 4.5 meter dish with 30-100 watts power will achieve uplink 
capabilities. TVRO receives 3.7-4.2 ghz and downconverts to some IF (such as 
70mhz (baseband). If you own a TVRO-Run video/demodulated/baseband output of 
the receiver to a ham receiver (such as an ICON R-71A) to tune in the
0-10.75 mhz range of the satellite of choice. Now you have to find where to 
look for TELCO transponders. Below is the main satellite/TELCO information.


SATELITE       TELCO TRANSPONDERS
 
SATCOM V       3-5-7-11-17-13
SATCOM IR      5-7-9-10-17-23
COMSTAR IV     1-3-4-6-7-15-16-19-22-23
WESTAR IV      14-20-24
TELSTAR IIIA   ALL
COMSTAR III    2-5-7-9-14-15-16
               18-20-21-22-23
WESTAR II      1-4-5-8-9
GALAXY II      12 CI TRANSPONDERS HERE
COMSTAR 01/02  ALL
SATCOM IIR     3-4-7-19-21-22-23-24 

Remember each carrier may use up to 2700 voice channels with numbers growing. 
Duplex FM or SSB/SCPC carriers.


Donated by Dr Rajha for your interest and education.