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Connect the RF output of the transmitter or transceiver to

the RF IN connector on the rear of the AL-811H with 50

ohm coax. Use any 50 ohm cable (RG-58 is fine) with PL-

259 plugs.

Connect the existing station antenna system to the RF OUT

connector on the AL-811H with any 50 ohm coaxial cable

capable of carrying 650 watts.

Use shielded audio type cable with standard male phono

plugs to connect the RELAY jack on the AL-811H to the

exciter's normally-open amplifier keying circuit.

keying circuit in the AL-811H has a positive 12 VDC open

circuit and it provides 100mA of current when connected to

ground. The AL-811H has an internal back-pulse canceling

diode across the relay coil.

FUSES

12A 120V

8A 240V

FAN

INTERCONNECTIONS

The

TO ANTENNA

OR ANTENNA TUNER

AMERITRON

AL-811H

GND

A.C. POWER

PLUG

RF OUT

ALC

RELAY

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.

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.

30/20

160 ALC

ADJ

ALC OUT

AUX

RELAY

15/17

RF OUT

RF IN

GND

TRANSMITTER OR

TRANSCEIVER

TO EARTH

GROUND