Revision 2
15
Amplifier Rear Panel
50VDC The power supply should be unplugged before installing or removing this
connector. This connector is indexed by a slight vertical offset in the two round
index pins. Mate the round pins and holes. Seat the male plug fully onto the
amplifier rear panel male connector pins. After seating, the power supply can be
plugged into the AC mains outlet.
ALC Optional connection. Connects to radio ALC input.
RELAY Connect to radio amplifier keying line. Radio must pull this line below 2 volts to
transmit.
KEY LOOP Output for remote tuner use.
KEY LOOP Switch Switch to turn on and off the KEY LOOP function.
GND Connect to station ground buss, 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.
RF OUT To 50-ohm antenna, antenna tuner, power meter. This is the high power output.
50-ohm coaxial cable and system beyond must safely handle at least 1200-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. It provides access to controls, including most
metering functions.
1.) If you use a desktop grounding buss system, connect the station ground buss 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.
2.) Connect the power supply to the amplifier.
3.) 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. Relay
control voltage from the ALS-1306 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.
4.) 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 1500-watt rated
Power/SWR meter, antenna, or antenna matching device. Good quality Mini-8 or RG-8X
cables are acceptable for anything but RTTY use, although larger RG-8 style cables are
normally preferred. Your antenna matching system, or antenna tuner, must connect to
this port.
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