AMERITRON ALS-606, Instruction Manual

Page: 24 / 44

Version 0A 24
RELAY
Connect to radio amplifier keying line. Radio must pull this 12-volt 15mA line
below 2 volts to transmit.
GND
Connect to station ground bus, if available. This connection is primarily for extra
safety.
RF IN
Connect through good 50-ohm coaxial cable of any reasonable length to radio’s
antenna output connector. This can be a smaller cable, such as RG-58/U, and
should not be needlessly long.
RF OUT
To 50-ohm antenna, antenna tuner, or power meter. This is the high power
output. 50-ohm coaxial cable and system beyond this connector must safely
handle at least 600-watts.
RADIO INTERFACE
This connector is for use with Ameritron radio interface cables. It allows
automatic band selection (following the radio). It also provides amplifier actuation
in transmit mode with some radios.
REMOTE
These RJ45 connectors are for an Ameritron remote control head, or remote
operation with an interface box. They provide access to controls, including most
metering functions.
KEY LOOP
Key loop switch and jack are for use with certain automatic antenna tuners.
Instructions will be in tuner manual. Key Loop switch must be off when using
remote cable unless using this jack.
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If you use a desktop grounding bus system, connect the station ground bus to the
amplifier rear panel wing nut. National safety codes require the station ground
electrically bond to the power mains safety ground at the building entrance. Do
not connect the amplifier to its own isolated ground rod or ground system.
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Connect the power supply to the amplifier.
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Connect the RELAY line to the transceiver’s amplifier control port. This port is
usually described or defined in the amplifier interfacing section of the radio or
transceiver manual. This port must pull low for transmit, and be open circuit when
receiving. Nominal relay control voltage from the ALS-606 is 12 volts positive with
only 15 mA current. You should always check your transceiver’s manual, but
almost any standard transceiver directly interfaces with this amplifier.
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Connect the RF OUT (output) port to the appropriate point in your station. This is
the high power RF output cable. This connection would go to your (minimum)