AL-800H Instruction Manual
14
3. Shielded audio type cable with a standard male phono plug should be used to connect to the
"RLY"
jack on the AL-800H. This jack has positive 12 Vdc open circuit and supplies 100 mA of current
when pulled to ground. The relay circuit has an internal back pulse canceling diode to protect sensitive
exciter circuits from damage.
4. Connect a short, wide, and smooth ground lead from a good earth and RF ground to the rear panel
"GND"
terminal. Avoid using braided conductors for ground leads.
5. The
"12 V"
connection on the rear panel provides 12 Vdc at 200 mA maximum to operate external
dial lamps or accessories such as the ATR-15 Antenna Tuner.
6. Connect the
"ALC"
jack to the ALC input of the exciter with a shielded cable and a phono plug. The
proper connection point on the exciter should be indicated in the exciter's manual. The AL-800H ALC
will operate with any exciter that uses a negative-going ALC voltage of up to 10 volts.
Note: Transceiver ALC response times and ALC voltage requirements vary with different
manufacturers. The ALC section describes adjustment of this circuit in detail.
Operating Instructions And Guidelines
Front Panel Controls
"MULTIMETER" Switch
This four position switch selects either the plate voltage (HV) of 0-3500 volts, the reflected peak envelope
power (REF) of 0-500 watts, the ALC detector output voltage (ALC) of 0-35 volts, or the approximate ALC
grid current threshold (ALC SET) of 0-175 mA. See the METERS
section on page 6 for more details.
"OFF-ON" Switch
This switch turns the main power off and on. When this switch is placed in the
"ON"
position the blower
should start, the right-hand meter should be illuminated, and high voltage should appear. The left-hand
meter should illuminate and the amplifier should operate after three minutes.
"STBY-OPR" Switch
This switch disables the amplifier's internal antenna relay and resets the grid protection circuit. In the
"STBY"
position the amplifier is bypassed without turning the tube's heater or the power supply off.
This switch will also reset the grid protection circuit if the
"OL"
LED is illuminated. The overload circuit
is automatically reset whenever this switch is placed in the
"STBY"
position and returned to the operate
position.
