d. The output of up to four upconverters may be
supply, which has complete fault and status monitoring
applied to the on-line amplifier/mixer.
amplifier/mixer, all incoming levels are balanced and
then applied to the input of the power amplifier. For
single channel operation the output of a single
upconverter is applied directly to the power amplifier.
e. The output of the on-line amplifier/mixer or
of voice frequency, teletype, and digital baseband
upconverter drives the on-line power amplifier. The
processing equipment. It interfaces the users to the
power amplifier contains a five-cavity klystron amplifier
terminal and is interfaced with the radio subsystem
tunable over the 500-MHz transmit band with five
through either 70-MHz or 700-MHz signal lines.
calibrated tuning adjustments available through the
access cover in the front panel. The output of the
frequency (VF) circuits (fig. 6-11) are fed from junction
boxes to the central distribution frame (CDF), through the
operated transmit waveguide switch in the shelter which
VF patch panel to the line conditioning equipment. The
selects either power amplifier as the online unit to drive
line conditioning equipment handles 4-wire circuits using
the antenna. The off-line or standby power amplifier is
1600-Hz and 2600-Hz in-band signaling, or 2-wire
terminated in a dummy load through the waveguide
circuits using 20-Hz ringdown. Signals from the line
switch, allowing the unit to be turned on and monitored or
conditioning equipment are routed to the AN/FCC-98
tested, as desired. Operating high voltage for each
multiplexer set which forms the mission bit stream.
power amplifier is provided by an associated power