13
7 ELECTRICAL CONNECTIONS
7.1
Connections to Transceiver / Exciter
Signal connections
Before making any connections, ensure that DX-3SP is not connected to AC power, and the transceiver is not
transmitting. Connect the antenna first to the DX-3SP output. Then connect the transceiver output to the DX-
3SP RF input. Plug the PTT lead into the RCA socket marked PTT on the rear panel.
The most appropriate interconnection layout is shown in Figure 5 below. In this set-up, the transmit/receive
relays in the DX-3SP are controlled directly by the transceiver or exciter.
Figure
5
Connections between DX-3SP 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-3SP. Terminate the power cable if necessary (export versions). Check that the transformer tap
corresponds to the nominal local mains voltage. 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-3SP 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 or to the Neutral wire.
IN THE U.S.: The Brown and Blue wires connect to the mains transformer inputs. Brown wire is to be
connected to AC line 1 and Blue wire to AC line 2. Both lines are fused
.
IN OTHER COUNTRIES: The brown wire is to be connected to the LIVE or ACTIVE line. The blue wire is
to be connected to NEUTRAL.
7.4 Operation at 240V, 230V, 220V, 200V (export version)
The Emtron DX-3SP 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 7 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 5.
To change the transformer tap, a single brown wire has to be unsoldered and moved to the new tap.
See below
EMTRON
DX-3SP
Station
Transceiver
PTT
Relay
Input
ALC
PTT
Relay
Output
ALC
(Optional
)
RF
OUT
RF
IN
RF
OUT
TO
ANTENNA
