Instruction Manual

11
Installation
Please look your amplifier and power supply over carefully. Observe the air inlet and
outlet ventilation holes. Facing the amplifier front panel, the cooling air inlets are on the
top left and lower right side, including the right bottom. The warm air outlet is on the
lower left side of the cabinet as viewed from the normal operating position (front view).
While outlet air will not be particularly warm, it is never a good idea to have warm air
blow into heat sensitive equipment, such as transceivers or other power amplifiers.
Have the same consideration for your new amplifier and power supply. Be sure the air
inlet temperature is not substantially above normal room temperature. Ideally, the air
inlet temperatures should be below 32° C or 90° F, although temperatures up to 41° C
or 106° F are permissible. If ambient temperatures exceed these limits it might become
necessary to reduce duty cycle or power.
Warning: Do not block cooling air inlets and outlets!
Never expose the amplifier to water or mist.
Installation Clearances
The amplifier must have a clear area to the bottom, both sides, and top for proper
airflow, and to the rear for interconnection wiring. It is especially important to avoid
obstructions that block the air inlet on the top left, as well as both lower sides. Two
inches clearance is normally adequate for full ventilation. Keep any papers or loose
objects that might impede airflow away from the air inlets and outlets.
Locate the amplifier and power supply away from sensitive equipment such as
microphones, audio processing equipment, or low level audio or radio frequency
amplifiers. Generally, the best location for the power supply is below the operating desk
and away from antenna feed lines. This will keep fan noise and any RF coupling to a
minimum.
The power supply has an air inlet at the rear, and air outlets on the top. The highly
efficient power supply produces very little heat, but the inlet and outlet must remain
open to normal room temperature air.
Installation Warnings
Accessory Equipment and Devices
One of the most common causes of amplifier failures or erratic fault protection alarms is
installation of antenna switches, lightning protection devices, or baluns with lightning
spark gaps in high SWR lines. If your antenna system has an SWR high enough to
require an antenna tuner, do not use 50-ohm lightning protection devices after the tuner.
Installation, Wiring, and Connections
The power supply is factory wired for 200 to 260 Vac. It uses a standard NEMA-6-15P
15-ampere 240-volt plug. The round center pin is the safety ground. Do not remove the
safety ground.
CAUTION! Before connecting the power supply to an electrical outlet, always be sure
you have completed the following four steps:
1. Insert the 15-ampere 250V fuses into the two black fuse caps.