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Installation and Calibration
Caution
12
Coaxial Connectors
The IF INPUT and the IF OUTPUT on the front
panel, and the AUX IF OUT on the rear panel require
75
BNC male mating connectors compatible with the
speci cations of US MIL-C-39012.
IF Input Signal
The best Fader performance is found at IF INPUT levels
of 8 dBm. Performance is very good to 3 dBm. If
you have a more powerful signal use an attenuator before
inputting it to the IF Input of the Fader. If you have a
signal that is much weaker than 8 dBm, consider using
an ampli er.
Do not input power exceeding +20 dBm to the IF Input
of the Fader. This could damage the instrument.
Error Pulse Input
The error pulse input is internally con gurable to the
following:
ECL 75
(default)
TTL 75
TTL 10k
Variable threshold, -2 volt termination, 75
Variable threshold, 0 volt termination, 75
Variable threshold, 0 volt termination, 10k
To make the appropriate setting press the
key, and then press
485
displayed. Press
4
ENTER
the options listed above. Press
have the correct input for your radio.
After selecting one of the options listed above and
pressing
, the selection
4
5
ENTER
is displayed. Press
4
ENTER
4
RADIO SETUP
until
1 ERROR TERM
and use
to toggle through
5
485
again when you
4
5
ENTER
1.1 ERROR THR
and change the trigger
5
HP 11757B
5
is
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