AMERITRON ALS-500M Gebruiksaanwijzing - Pagina 6

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ALS-500M

Instruction Manual

Written assistance is also available. Due to time delays in processing mail, please allow a minimum of

three weeks for a written reply. Send questions to: Ameritron, 116 Willow Road, Starkville, MS

39759

Export Modifications

A simple modification will allow operation on frequencies above 22 MHz. A parts kit to make this

modification is available by sending a written request for an MOD-10M export modification kit along

with a copy of your valid amateur license to the Ameritron. There is a charge for this kit. Export

models are shipped with this modification installed and have an "X" following the serial number.

INSTALLATION

Location

Do not locate this amplifier in excessively warm locations, near heater vents, or in unventilated areas

with ambient temperatures exceeding 120 degrees Fahrenheit. Be sure that air can circulate freely

around and through the amplifier cabinet. Do not obstruct the air inlet at the right front side of the

amplifier or the outlet air holes on the lower left side of the amplifier.

When not using the ALS-500M remote control head the best location for this amplifier is one that

allows the meter to be easily read and the controls accessed during operation. The length of each 13.8

volt high current cable is very important. Every consideration should be given to keeping the high

current battery lead lengths as short as practical. This includes the ground leads to the battery and the

ground lead to the vehicle's chassis.

The lengths of the remaining low current power and control cables are not critical. The relay control

lead can be made from any good quality two wire cable. Low level audio type cables sold for stereo

and VCR use are ideal for the relay connection. The RF cables should be kept as short as practical.

Power Requirements

This amplifier requires 11-18 volts positive at low current (less than 4 amperes) for the control and

bias circuits. This is a non-critical voltage. The voltage applied to the low current control line will not

affect the performance of the amplifier if it is within the specified range. The control line is the small

red wire that connects between pin 10 of the power connector and the 5 ampere fuse.

The heavy RED conductors and the black battery return and chassis ground conductors must carry the

full peak current of the amplifier. This current can reach 80 amperes on voice peaks or 40 amperes of

average current. This large current is split between the two large RED wires leaving pins 3 and 4 of the

power connector. The ground connections from pins 11 and 12 must also carry this current. It is

extremely important to minimize the voltage drop across these conductors. For maximum performance,

all of the high current leads (including the ground leads) must be kept as short as possible.

The following chart gives the approximate peak voltage drop in volts per foot of a single supply wire

with 40 amperes of current. Remember the ground wires also carry high current. This chart assumes

that the chassis ground of the vehicle has negligible resistance, and that the negative lead to the battery

is the same wire gauge as the positive supply leads. The chart on page 5 indicates the maximum length

of each individual wire for full performance: