The satellites commonly known in Brazil as "Bolinha" are the satellites
North American military geostatistics denominated like FleetSatCom or UHF
SatCom. These satellites were developed by RCA American Communications
(AmericCA RCA) and were launched between 1975 and 1992. Since 1986, they have been
controlled by General Electric American Communications (GE Americom) and from
2001 by SES Americom.
Contrary to many people's beliefs, these satellites are not "abandoned",
still very active, with intense use.
What happens is that by using linear transponders (enters FM, exits FM;
digital signals, digital signals; enter SSB, exit SSB), most
official communications are used in encrypted digital modes,
with minimal official activities in analogue modes (AM, FM, SSB). But
in August 2007, the space shuttle Endeavor used the frequency of 259,700 in
AM. There are also British, Italian and Russian military satellites (called Gonets)
also in this range.
The SatCom military operations manual, with the last edition in 2004, is on the following link: j.gs/8631141/ma...
The "Radio Revolucionaria Nueva Fraternidad de Guatemala" also broadcasts
frequencies of the SatCom (until recently it was at 261,800 Mhz), but there is
"fixed" frequencies, since the US military carries out a "
jammer ", ie retransmit FSK digital signals overmodulating the audio of these
stations, as they can render the satellite
intensive use.
"Radio Colombia Libre", also radiated on the satellite because most of the
of the narco-guerrillas of the Colombian factions "migrated" to the 6 GHz satellites.
Therefore, if you have equipment that can TRANSMIT in this range, take absolute
Watch out ! Do not fall into the "temptation" to make some contact, for the consequences
can be very serious, problematic and complicated.
However, listening to radio broadcasts is not a crime, and for those who
"corujar" these frequencies.
To make it easier to locate the satellite, leave the receiver
frequency of 244.125 MHz, where there is a beacon, or 250.550 MHz, where there is a
continuous telemetry signal.
It should be taken into account that because it is emission from a satellite, the signals are very weak,
therefore use the shortest possible length of coaxial cable between the receiver and the
antenna!
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