Instruction manual

AL-800 Instruction Manual
14
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-800 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 850 watts of continuous RTTY, FSK, FM or CW power output when the amplifier is
properly tuned. The blower in the AL-800 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-800 is supplied with a NEMA 5-15P plug for 120 Vac operation. The
Transformer
Connections
section on page 15 show the correct wiring for various supply voltages.
This amplifier has a current demand of approximately 16 amperes at 120 Vac with 1200 watts of
carrier output and an absolute maximum draw of 20 amperes under severe operating conditions.
The average power line current during voice peaks on SSB will be approximately 6 amperes at 1200
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 life of the amplifier components if the fully loaded high voltage
remains above 2000 volts. 240 volt operation will help improve performance if the power wiring is
marginal.