a. Aim the antenna at a quiet spot in the sky.
Repeat step h above at 7950.000 MHz.
b. Remove the screw fasteners on the front panel
k. Disconnect the loop test cable from the power
of the upconverter drawer and pull the drawer forward
meter and connect it through the 14 db attenuator to the
on its slides.
c. Disconnect cable W5 going from the
Calculate and record the input levels for each
synthesizer of the upconverter at J2 on module A4 and
frequency by subtracting 14 dB from the measured levels
of steps h, i, and j above.
connect the cable to the hard limiter test assembly (SM-
A-934943) through the test cable assembly (SM-C-
m. Connect the power meter with the HP-8481A
935488-1), and the SMA adapter provided in the test kit.
head to the 70 MHz OUTPUT (J4) of the downconverter
d. Remove the screw fasteners on the front panel
to be measured.
n. Read and record the measured level. The
of the LNA control/translator drawer, and pull the
drawer forward on its slides.
level should be at least 60 dB above the level calculated
e. Disconnect the connector A2P53 going to
in step I above.
o. The output level may be adjusted if necessary
receptacle J8 (SHF OUT) at the rear of the LNA
control/translator drawer and connect it to the output of
at the 700/70 MHz mixer assembly, A3A2, in the
the hard limiter test assembly.
downconverter drawer, with the receiver gain adjustment
Configure the shelter for normal operation and
control R5 or MDL gain control R6.
p. The overall receiver gain may be measured for
turn the power ON. The power amplifiers are left on
receive frequencies of 7250 MHz and 7699 MHz by
g. At the antenna mounted assembly, disconnect
tuning the upconverter synthesizer to 7950 MHz and
the terminal loop test cable (W15P2) from the bulkhead
8399 MHz, respectively. Output levels should be at least
connector and connect the cable to the RF power meter
60 dB above input at bulkhead connector.
q. Repeat the above steps for all other
with low power head (HP-8484A) using a UG-29B/U
downconverters, as required.
h. Set the synthesizer to 8399.000 MHz and
Remove all test cables, and restore all normal
measure and record the signal level.
connections on the drawers to return the shelter to
Repeat step h above at 8200.000 MHz.