8
METERING:
The front panel moving LED display systems indicate:
“Moving light” LED indicators:
•
output power
•
reflected power
•
screen grid current (positive / negative)
•
plate voltage
•
plate current
Five single LED’s:
•
on air
•
ready
•
fault
•
overdrive warning
•
SWR cut-off indicator
EBS:
Electronic Bias Switch - automatically switches the standing current (about 0.5 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.
The nominal Pre-Bias current is 40 mA (30 to 60 mA, not critical).
QSK:
makes possible the antenna switching at very fast rate - typically 3ms switching time in each direction.
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.
Typical voltage drop on the triac: 1 V when not transmitting, <2 V at full power.
PTT Switching:
Open circuit v6 VDC. Ground to key (6 mA to ground).
COOLING:
Two speed forced air cooling.
OPERATING TEMPERATURE:
0 to 40° Celsius
FUSING:
Two 40 A normal acting fuses in each mains line on the rear panel.
OPERATING MAINS VOLTAGE:
200 to 240 V, Single Phase (Transformer taps: 200, 220, 230, 240 V).
Optional 400V, power between 2 mains phases.
CURRENT CONSUMPTION:
about 35 A
RMS
when transmitting full power at 240 V mains.
DIMENSIONS:
470 mm wide, 250 mm high, 470 mm deep (18.5” x 10” x 18.5”)
WEIGHT
: 55 kg (120 lb) unpacked (with the transformer installed)
TRANSFORMER:
shipped separately in a wooden box approx. 310 x 250 x 260 mm
(12” x 10” x 10.25”),
30 kg (66 lb).
