(2) The 700-MHz channel module performs a
double conversion techniques. It can also accept , a
frequency conversion from the 7250to 7750-MHz receive
700-MHz (auxiliary) IF and convert it to SHF by a single
band to an IF output of 700 MHz. Conversion is from
conversion. Its output may be fed directly to the power
SHF to 700 MHz for any multiple of l-kHz in the SHF
amplifier (PA) or to an amplifier/mixer unit which feeds
band. This is accomplished in an SHF mixer, using the
LO-1 output of the frequency synthesizer. Further
(1) The upconverter unit consists of seven
conversion to 70 MHz is accomplished by a 70-MHz
mixer in the channel module, using the LO-2 output of
the frequency synthesizer. When used in conjunction
Frequency synthesizer, A1.
with the 700-MHz wide-band filter, FL1, the 700-MHz
channel will supply a wideband 700-MHz 62.5 MHz
output to the user.
Delay equalizer, A3.
e. Upconverter. The upconverter is the first unit
IF amplifier (700/SHF), A4.
in the transmit chain of the radio subsystem. It accepts a
SHF filter monitor/IPA, A5.
70-MHz modulated IF signal from a modem in the
700 MHz bandpass filter, FL1.
Power supply, PS1.
and translates it to the final SHF output frequency, using