12
7 ELECTRICAL CONNECTIONS
7.1
Connections to Transceiver / Exciter
Signal connections
Before making any connections, ensure that DX-3 is not connected to AC power, and the transceiver is not
transmitting. Connect the antenna first to the DX-3 output. Then connect the transceiver output to the DX-3
RF input. Plug the PTT lead into the RCA socket marked PTT on the rear panel. If required, connect the
ALC. (In most cases there is no need for ALC –
see 10.2
)
The most appropriate interconnection layout is shown in Figure 2 below. In this set-up, the transmit/receive
relays in the DX-3 are controlled directly by the transceiver or exciter.
Figure 2.
Connections between DX-3 and Station Transceiver
7.2
Earth and mains connections
Power connections
Before connecting any power to the amplifier, make a good Earth connection to the screw with wing nut at
the rear of DX-3. Make sure the POWER switch on the front panel is in the OFF position. Then plug the
power cable into the power outlet.
7.3
Terminating the power cable (export version)
As different countries have different standards for their power connections, the DX-3 amplifiers exported
from Australia are supplied with an un-terminated power cable.
The
green / yellow wire
is connected to the amplifier chassis and MUST be connected to the
safety ground
of the AC mains supply. It must NEVER be connected to one of the AC “hot” wires. The Brown and Blue
wires connect to the mains transformer inputs.
The brown wire is “active”
or “live”. The
blue wire
is the
mains
neutral.
Both wires are fused.
7.4 Operation at 230V, 220V, 200V (export version)
The Emtron DX-3 will normally arrive pre-set for the power source of the country the amplifier has been sold
to. However if operation to another mains voltage is required, the appropriate connection changes will be
needed.
Figure 3 shows the transformer connections for 200V, 220V, 230V and 240V operation. If a change is
required, this should be done only by a qualified technician, after taking all the necessary safety precautions.
See CAUTION on page
1.
PLEASE NOTE:
The DX-3 should not be connected to a mains supply of less than 200VAC!
EMTRON
DX-3
Station
Transceiver
PTT
Relay
Input
ALC
PTT
Relay
Output
ALC
(Optional
)
RF
OUT
RF
IN
RF
OUT
TO
ANTENNA