8
•
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 0.3 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 an option that makes possible the antenna switching at very fast rate - typically 3ms switching time
in each direction. FACTORY INSTALLED ONLY.
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.
OPERATING TEMPERATURE:
0 to 40° Celsius
FUSING:
Two 15A normal acting fuses on the rear panel
DIMENSIONS:
380mm wide, 180mm high, 380mm deep
WEIGHT
: 20kg (44 lb) unpacked
3 UNPACKING
The DX-1d is packed in a heavy duty package easily sufficient to protect the amplifier during transportation,
even in case of fairly rough handling. The weight of the commercially rated mains transformer does mean,
however, that dropping the amplifier would without doubt result in some damage.
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-1d in other than factory packing may result in non-warranty damage.
3.2 Opening the DX-1d 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 Removing the packing block
Assuming all is well, remove the block of foam from the amplifier bay and check that the amplifier tube is
firmly pressed home.
Make sure the temperature sensor above the tube is in horizontal position or
slightly up position.
If the sensor is bent down and touches the tube or if comes too close to the tube, the
plate high voltage will be shorted and damage could occur. Replace the cover and secure all four screws that
hold the cover in place.
