Page 14
VL-1000 Operating Manual
Operation
Linear Amplifier Operation
Although continuous full exciter power is re-
quired for accurate SWR measurement and
antenna matching, this will cause overheating
if transmitting for an extended period when
OPERATE switch is depressed (that is, when
the power amplifier section is on). So once
the antenna has been matched the first time,
reduce the setting of the exciter’s D
RIVE
or R
F
P
WR
control if you contemplate operation us-
ing a continuous-carrier operating mode (see
the guidelines below).
For SSB and CW operation, make sure to
adjust the M
IC
G
AIN
and/or D
RIVE
control on the
transceiver for proper ALC indication on the
transceiver ALC meter, as described in the
transceiver manual. Generally, for SSB, the
ALC meter indication should not deflect be-
yond a certain ALC limit (the “ALC” zone on
the transceiver’s meter) on voice peaks; on
CW, the ALC indication should be just enough
to cause slight meter deflection. Higher ALC
levels may produce distortion or key clicks,
without producing any additional power output.
For FM, SSTV, RTTY, AMTOR or packet,
press the LOW switch to select the LOW power
condition to prevent the overheating during
continuous operation for extended periods.
For AM operation, adjust the D
RIVE
or R
F
P
WR
control on the transceiver so that the AVG
power meter on the VL-1000 does not exceed
250 watts when transmitting a carrier. On voice
peaks, adjust the M
IC
G
AIN
control on the trans-
ceiver so that the PEAK power meter on the
VL-1000 does not exceed 1000 watts.
Operating Precautions
Summarized below are some precautions to adhere to in order to ensure long life and trouble-
free operation with the VL-1000.
r
Do not transmit, after changing bands, until “
COMPLETE
” appears on the display.
r
Do not transmit when turning the POWER switch or the ATT switch on or off.
r
When changing bands, always make certain that the VL-1000 is set for the same band as
the transceiver before transmitting, and that the proper antenna is connected. Remem-
ber that ANT 1 is automatically selected when the VL-1000 is switched off.
r
Reduce the drive power or shorten transmissions if Warning Message #1001 appears on
the display (see next page).
Beeper on/off
When you press a switch, the beeper pro-
vides useful audible feedback to confirm that
the switch was successfully activated.
If you want to turn the beeper off, first turn
the VL-1000 off, then
press and hold in the
DISPLAY 1 and DISPLAY 2 switches while you
turn the VL-1000 on. To turn the beeper back
on again, repeat this switch-on procedure.
Resetting the CPU
The VL-1000 can be reset so as to clear all
settings, display memories, and antenna tuner
data; these will be reset to their factory de-
faults.
To reset the microprocessor,
press and hold
in the OPERATE and DIM switches while you
turn the VL-1000 on.