ection 1
Direct readout ground station components
polar-orbiting system requires a personal computer and a receiver connected to
an antenna by coaxial cable
geostationary system requires a personal computer, a receiver, feedhorn, down-
converter and a parabolic dish connected by coaxial cable
dual system may require all of the above, although the basic set-up varies
among manufacturers
figure 59.
GR O U N D STAT I O N
CO N F I G U R AT I O N
1691 MHz to 137–138 MHz
downconverter
(th e quadr ifila r helix antenna
shown is an example of an
omnidirectional antenna )
antenna
coaxial cable
such as Belden 9913 or 9311
feedhor n
level
adjust
box
A-B
Switch Box
for dual system only
receiver
137–138 MHz
12 volt
power supply
audio
cable
exterior components
interior components
S
