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Page 14 VL-1000 Operating Manual
Operation
Linear Amplifier Operation
Although continuous full exciter power is re-
quired for accurate SWR measurement and an-
tenna matching, this will cause overheating if
transmitting for an extended period when OP-
ERATE switch is depressed (that is, when the
power amplifier section is on). So once the
antenna has been matched the first time, re-
duce the setting of the exciter’s D
RIVE or RF
PWR 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 GAIN and/or DRIVE 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 beyond
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 lev-
els may produce distortion or key clicks, with-
out 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 RF
PWR 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 GAIN 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.
Do not transmit, after changing bands, until “
COMPLETECOMPLETE
COMPLETECOMPLETE
COMPLETE” appears on the display.
Do not transmit when turning the POWER switch or the ATT switch on or off.
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.
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 defaults.
To reset the microprocessor, press and hold
in the OPERATE and DIM switches while you
turn the VL-1000 on.
16


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