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4 INSTALLATION ENVIRONMENT
4.1 Required environment
The DX-1d amplifier can be operated at an ambient temperature between 0 and 40° Celsius. It should be
installed in a place with good ventilation and protected from the direct sunlight. At least 5 cm of free space
must be left at the left and right of the amplifier for ventilation. Do not place any object on top of the
amplifier, especially above the ventilation opening.
An environment free of dust, smoke and high humidity is required, as for any high powered RF amplifier.
Dust or particles resulting from burning fire wood or coal could be responsible for sparks or electrical
discharges between the capacitor plates, or in other parts of the RF section.
4.2
Power requirements
When operating at full power, up to 9A from the 240 VAC mains is required. Ensure that the AC supply you
intend to use is fully rated and properly fused. The Emtron "soft start" circuitry ensures that there are no
momentary surges of current at power-up, therefore the fuse does not need to be over-rated. However, the
wiring of the mains supply for the amplifier should be able to handle the power at full load with minimal drop
in the voltage, to insure the performance of your DX-1d does not suffer.
5 REAR PANEL
The following connectors and controls are present on the rear panel
5.1 Power / Earth connections
A wing-nut Earth connection is provided at the rear of DX-1d. A good Earth link must be provided here.
Connect this first, before making any other connection to the amplifier. Two fuse holders are fitted along with
15A, normal acting fuses.
5.2 RF connections
RF INPUT
The RF input is an SO-239 female connector. A 50 ohm coaxial cable line of good quality terminated with a
PL-259 coaxial connector is required to connect the transceiver or exciter output to the input connector of
your DX-1d amplifier.
RF OUTPUT
The RF output is also a female SO-239 connector. The use of a high quality RG-8A/U, RG-213 or similar 50
ohm coaxial cable line terminated with a ‘VHF’ type PL-259 connector is essential. Similarly, a VSWR of
2.6: 1 or better is mandatory. Remember too, that the EMTRON DX-1d amplifier can deliver 750 W
continuously and up to 1 kW PEP in the SSB mode. Not all antennas can handle such power.
5.3 Transceiver control
ALC
The ALC output is via a black female RCA connector.
This is an ALC system for use with transceivers or transmitters having a negative-going ALC system and
possessing an external ALC input jack. A shielded patch lead with an appropriate connector at one end and a
male RCA connector for the DX-1d at the other end is required. Check the specifications of your transceiver
for a suitable connection.
PTT
