Specifications

4-8. Audio Adjustment.
A. Connect a high impedance AC Voltmeter across the T and R terminals for the appropriate
channel at the rear of the unit under test. The audio equipment that will normally be
connected to these points should remain connected while performing this measurement.
B. Have a 450 transmitter site send a continuous tone of 1 kHz at Peak Program Level.
C. Use the AUDIO screwdriver control on the front panel to adjust the receiver output to Peak
Program Level.
D. Do this for both channels.
4-9. TRANSMITTER INTERNAL OPTIONS.
The internal options are selected with jumper plugs on the internal printed circuit board, and require
removal of the top cover plate of the units.
___________
_ WARNING _
___________
Unplug the power cord from the equipment before removing any cover
plates. Failure to do so could result in a hazardous electrical shock, and/or
damage to the equipment. Replace all cover plates prior to restoring power to
the equipment.
The top cover plate is held in place by 11 flat head phillips machine screws, 2 of which pass
through the top edge of the front panel. After removing these screws, carefully remove the top
cover plate by tilting the rear edge up slightly and sliding it out from under the top edge of the front
panel.
Refer to Figure 4-1 for the locations of the jumper blocks described in the following sections.
450 Operation Manual Rev A Page 27 8/26/99