8
Five single LED’s:
•
on air
•
ready
•
fault
•
overdrive warning
•
SWR cut-off indicator
ALC:
Negative going, adjustable output level.
EBS:
Electronic Bias Switch - automatically switches the standing current (about 0.75 A) to a lower ("pre-
bias") value - when there is no input drive.
PRE-BIAS:
A small current will flow in the tube when the amplifier is keyed on, but there is no modulation.
This will prevent a harsh sound at the beginning of each word, when the EBS is activated and the tube goes
through a non-linear zone, before reaching the correct initial bias.
QSK:
is a module that makes possible the antenna switching at very fast rate - typically 3ms switching time
in each direction. Fitted as standard in all DX-3’s.
SOFT START:
when switched on, the mains power is gradually applied to the transformer, over a period of
about 5 seconds, to avoid the high in-rush current typical for such high loads.
COOLING:
forced air cooling, two fans, two speeds, temperature controlled
OPERATING TEMPERATURE:
0 to 40° Celsius
FUSING:
Two 30A normal acting fuses on the rear panel
DIMENSIONS:
435mm wide, 190mm high, 465mm deep
WEIGHT
: 18 kg (40 lb) un Transformer 25 kg (56 lb) unpacked
3 UNPACKING
The DX-3 is packed in a heavy duty package easily sufficient to protect the amplifier during transportation,
even in case of fairly rough handling.
3.1 Opening the carton
When opening the packing, do not cut the carton. Save the packing material for possible further re-use.
Shipment of your DX-3 in other than factory packing may result in non-warranty damage.
3.2 Opening the DX-3 cover
An inspection of the interior of the amplifier should reveal no damage or adversely affected components.
Remove the 4 screws on each side and remove the cover. Should there be any form of problem, notify your
supplier immediately.
3.3 Installing the transformer
Make sure the transformer is wired for the nominal mains voltage in your area. See 7.4
Two people are needed to install the transformer. The best is to put the DX-3 on a flat, smooth surface such as
a bench or a table top, covered by a small carpet of a folded blanket, so that it can be moved by sliding it on
the table.
Remove the screws holding the base plate in the amplifier. Make sure the holes in the plate remain aligned
with the holes in the bottom of the chassis. Lift the transformer and lower it into the chassis, positioned with