AL-800H Instruction Manual
11
Installation Guidelines and Suggestions
Location Of The Amplifier
Do not install 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 cold air inlet for the
amplifier.
DO
NOT
place any books, magazines or equipment that will impede the free flow of air near or
on the cabinet ventilation holes.
Ventilation
The AL-800H ventilation system has been designed and tested to maintain tube seal temperatures safely
below the tube manufacturer's rating at 1200 watts of continuous two tone test SSB PEP output, or 1500
watts of continuous two-tone or CW power output when the amplifier is properly tuned. The blower in the
AL-800H is a permanently lubricated type that requires no maintenance in normal operation. To insure
adequate cooling in your installation, please 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 ventilation holes have open air circulation. It is particularly important to avoid
restricting the air inlet.
2.
The exhaust airflow is over 30 CFM. Do not "assist" the exhaust airflow with cabinet mounted fans.
3.
The most efficient way to improve airflow is to pressurize the air
inlet
area. Be sure that any fan used
to assist the inlet airflow has
at least
a 60 CFM rating.
4.
The exhaust air will become quite warm at high power levels. Do not place any heat sensitive objects
in the exhaust air stream.
Power Connections
The AL-800H is supplied with a NEMA 6-15P plug for 240 Vac operation. Full duty cycle operation with
ac supply voltages below 200 volts is not recommended. The
TRANSFORMER CONNECTIONS section
on page 13 show the correct wiring for various supply voltages.
This amplifier has a current demand of approximately 14 amperes at 240 Vac with 1500 watts of RF carrier
output. The average power line current during voice peaks on SSB will be approximately 9 amperes at
1500 watts PEP output. Most normal residential power lines and house-wiring should meet this demand for
current.
If the power mains have excessive resistance, the high voltage may sag to less than 2200 volts under load.
Voltage sag will not hurt the amplifier if the fully loaded high voltage remains above 2000 volts.
CAUTION:
Never allow the high voltage to exceed 2700 volts under any condition.
For 240 volt operation, the wiring between the fuse box and the amplifier ac outlet must be number 14
gauge (or larger) in order to supply the current required (14 A) without a significant drop in the line voltage.
The 240 volt outlet should be fused 20 amperes.
