Instruction manual

5
INTERCONNECTIONS
1. Connect the RF output of the transmitter or transceiver to
the RF IN connector on the rear of the AL-811HD with 50
ohm coax. Use any 50 ohm cable (RG-58 is fine) with PL-
259 plugs.
2. Connect the existing station antenna system to the RF OUT
connector on the AL-811HD with any 50 ohm coaxial cable
capable of carrying 650 watts.
3. Use shielded audio type cable with standard male phono
plugs to connect the RELAY jack on the AL-811HD to the
exciter's normally-open amplifier keying circuit. The
keying circuit in the AL-811HD has a positive 12 VDC
open circuit and it provides 100mA of current when
connected to ground. The AL-811HD has an internal back-
pulse canceling diode across the relay coil.
4. Connect the shortest possible ground lead from a good
earth ground to the GND terminal. The best leads are solid
(instead of stranded or braided) copper. It is also best to
use a common ground point for all the equipment in the
station.
5. Use a shielded audio cable with standard male phono plugs
to connect the ALC out jack on the back of the amplifier to
the negative going ALC input jack on the exciter. Do not
connect this line until you have read and understand the
function of the ALC circuit. Exciters with output powers
below 70 watts do not normally require this connection. If
this jack is connected without adjusting the ALC control,
the exciter may not develop any drive power.
FUSES
12A 120V
8A 240V
FAN
AMERITRON
AL-811HD
30/20
80
AUX
15/17
40
160
ALC
ADJ
ALC OUT
RELAY
RF OUT
RF IN
GND
A.C. POWER
PLUG
RF OUT
ALC RELAY
GND
TO EARTH
GROUND
TRANSMITTER OR
TRANSCEIVER
TO ANTENNA
OR ANTENNA TUNER