AMERITRON AL-1500 Buku Petunjuk - Halaman 9

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LOCATION

-Do not operate the Amplifier in excessively warm locations

or near heating vents or radiators. Be sure air can circulate

freely around and through the Amplifier cabinet. Provide an

unobstructed air inlet for the blower. Do NOT place anything

that will impede the free flow of air within 2 inches of the

cabinet ventilation holes.

VENTILATION

The AL-1500 ventilation system has been designed and

tested to maintain tube seal temperature safely below the

tube manufacturer's rating at 1500 watts output with a 100%

duty cycle when properly tuned. The blower in the AL-1500

is a permanently lubricated type that requires no main-

tainence in normal operation. To insure proper ventilation in

your installation, observe the following:

1. Do not block or unduly restrict the ventilation holes in

the cover. Be sure that the amplifier is located in an area

so the vent holes have open air circulation.

2. The exhaust air flow is over 30 CFM. Do not "assist" the

air flow unless the fan exceeds the AL-1500 blower

CFM by a factor of 2:1.

3. Do not mount additional fans on the AL-1500 cabinet.

4. The exhaust air will become quite warm at higher power

levels. Do not place any heat sensitive objects in the

exhaust air stream.

Proper tuning of a grounded grid linear amplifier is best

accomplished with an understanding of what each control

does and what the meters are telling the operator about the

condition of TUNE.

The tuning controls function as follows:

PLATE: This control tunes the amplifier output circuit to the

operating frequency. It should always be adjusted for

maximum output power or maximum grid current. Due to

interaction with the ''LOAD" control, a "touch-up" should be

performed after any load adjustments.

LOAD: This control adjusts the coupling of amplifier to the

antenna or load. It should be adjusted to keep the grid

current in the proper operating range. As the loading

capacitance is reduced (by rotating the control to a higher

front panel number), the coupling is increased. An increase

in coupling will reduce grid current and increase the amount

of drive the amplifier will accept without component

damage.

A common mistake in tuning is to adjust the "LOAD"

control at low drive powers and apply more drive dur

INSTALLATION Cont.

POWER CONNECTIONS

The AL-1500 is supplied with a NEMA 6-15P plug for 240V

AC operation. Operation with power main voltages below

200 volt is not recommended. Special transformers are re-

quired for 200V, 50/60 Hz operation (see NOTE on page 1).

Refer to the "Transformer Installation" section on pages 4

and 5 for the correct wiring for 220 to 240 volt operation.

NEVER REWIRE THE POWER SUPPLY TO BOOST

THE HIGH VOLTAGE ABOVE 3700 VOLTS.

The wiring between the fuse box and the amplifier AC outlet

must be No. 12 gauge or larger in order to supply the current

required (13 amperes) without a significant drop in the line

voltage. The outlet should be fused for 20 amperes.

GROUNDING

Connect a good RF and earth or water pipe ground to the

ground post on the rear panel of the Amplifier. Use the

heaviest and shortest connection possible.

Before you use a water pipe ground, inspect the connections

around the water meter and make sure that no plastic or rub-

ber hose connections are used. These connections interrupt

electrical continuity to the water supply line. Install a jumper

around any insulating water connections you may find. Use

heavy copper wire and pipe clamps. It is best to ground all

equipment to one point at the operating position and then

ground this point as described above.

TUNING INSTRUCTIONS

ing operation. Excessive grid current, distortion on SSB or

arcing in the tank components occurs when full drive power

is applied to the amplifier without the "LOAD"' set for

enough clockwise (higher loading).

It is important to remember the loading must be set properly

for the PEAK power the amplifier is expected to develop. 50

watts PEP will be the maximum drive the amplifier will

safely handle if the output of the amplifier is tuned with 50

watts of carrier drive. Any attempt to go beyond the amount

of drive power the amplifier was originally tuned at will

result in a rapid increase in grid current, splatter and even

damage to components.

The "LOAD" control should be adjusted for maximum

output power without exceeding the recommended grid

current. DO NOT USE THE LOAD CONTROL TO

REDUCE POWER IN A GROUNDED GRID AMPLIFIER.

The drive from the exciter should be reduced if the amplifier

plate current or output power is excessive. The "LOAD"

setting should be increased if grid current is excessive. Any

errors in adjusting this control should be made in favor of a

higher load setting (clockwise).