Instruction Manual

6.) The ALS-1406 power supply system is voltage regulated. You should see very

little change in HV1 and HV2 with amplifier power. Less than 3 volts change from

the 50Vdc nominal voltage is normal.

7.) The ALS-1406 has two power supply boards in the power supply. Exceeding safe

power supply current on any supply line will force the overloaded supply into

shutdown. Power Supply shutdown is reset by turning the main power switch off

for a brief time. If the power supply has a permanent overload or the supply has

failed, it will not reset.

Radio and Antenna Connections

WARNING: Forcing connector engagement can result in permanent connector damage.

Solder on the outside of center pins or bent pins are primary causes of female

connector damage. External solder or bent center pins will permanently damage the

female.

Do not use Line Isolators on amplifier RF cables. The chassis of the amplifier should be

at the same RF potential as all other desk equipment. Shield isolators allow equipment

to float to different RF chassis potentials. Different chassis potentials are exactly what

we do not want, and isolators on desk coaxial cables encourage different potentials. It

is better to cure RF problems outside the operating position whenever possible.

1.) RF connections are through standard UHF female connectors. Use good cables

with quality UHF male (PL259) connectors. The output cable must safely handle

at least 1200 watts.

2.) Look at the connectors. The amplifier‘s female connectors have notches on the

outer thread edge. The cable males should have protruding tabs on the inner

shell beyond the center pin insulator. These tabs and notches prevent unwanted

connector rotation. The male’s tab or tabs must be aligned with the female’s

notches. This interlocking prevents connector rotation.

3.) With a firm handgrip, gradually tighten RF connectors while making sure the

male tab interlocks with the amplifier’s female connector notch. Do not use

excessive force on connectors. Check for proper tightness and seating by

wiggling and flexing the cables near the connector and watching for any

indications of abnormal male connector movement, and by wiggling the cable

while hand tightening the male shell. If done properly, the connector will be

solidly locked without need for pliers or other tools

4.) ALC and Relay (keying) connectors are phono females. The phono males from

external cables should push directly in with a snug fit.

5.) The Relay line has low-voltage (<14 V) low current (<20 mA). Transmit is

enabled by pulling the Relay line to ground with a relay contact or transistor.

Read your radio manual. Unless you have a very unusual radio, your radio will

directly key the amplifier.

6.) The remote and radio band data connectors are specialized connections. They

are for use with Ameritron supplied cables only.