12
The primary circuits are fuse by two fuses located on the back panel of the switching
power supply. The fuses are rated at 15 amps on 120 volts, or 8 amps on 240 volts.
Low Voltage Circuits
The low voltage power supply sections supply 14 volts positive at 2 amperes maximum
for control of lights, bias voltage regulator and the Bias/Wattmeter board in the ALS-600.
A separate 12 volts negative supply is used to operate inrush relay and the ALC circuit of
the ALS-600.
INSTALLATION
Amplifier Location
Do not locate this amplifier in excessively warm locations, near heating vents or near
radiators. Be sure that air can circulate freely around and through the amplifier cabinet.
Do not obstruct the air inlets at the rear of the amplifier and the outlet air holes on the
lower right side of the amplifier cabinet.
The best location for the amplifier is one that allows the meters to be easily read and the
controls accessed during operation. The length of interconnecting control cables are not
critical. The control leads should be made from good quality shielded cables. Low level
audio cables sold for use with stereo and VCR equipment are ideal. The RF cables
should be kept as short as possible.
Power Supply Location
The best location for this power supply is one that is away from devices that are sensitive
to magnetic fields. The meter and fuses should accessible for service. Do not obstruct
the air inlets at the rear of the power supply and the outlet air holes on the upper right
corner power supply cabinet.
Caution: The choke in the power supply emits strong magnetic fields. Never place
magnetic tapes, computer disks or other magnetic sensitive devices within 18
inches of the cabinet of the ALS-600PS.
Grounding
The station ground buss should be connected to a good earth and RF ground. Use the
heaviest and shortest connections possible. The best ground leads are smooth and have a
large surface area. Braiding (including standard coaxial cable shield) has a high RF
resistance and should be avoided unless the lead needs to flex. The best conductors for
ground connections are copper flashing or copper foil. Solid copper wire can be used and
will closely approximate copper flashing if multiple ground leads are used and separated
at least a few inches apart.
