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Page 13VL-1000 Operating Manual
PLAY 2 key (to decrease ALC voltage/in-
crease power output) until the power out-
put from the amplifier reaches 1000 Watts
(these tuning procedures should be as
short as possible).
8. Return the input transceiver to the receive
mode.
9. Press the LOW switch to select LOW
power operation.
10. Again transmit a carrier at full drive power;
press the DISPLAY 1 or the DISPLAY 2
key, as needed, until the power output from
the amplifier reaches 500 Watts. Now re-
turn the exciter to the receive mode.
11. Press and hold in the INPUT switch for ½
second to exit the ALC Alignment mode.
12. Press the TUNER switch to turn on the an-
tenna tuner (“TUNER” indicator will be ON).
13. Repeat steps 4 through 11.
14. You can align the ALC voltage of the trans-
ceiver that is connected to the INPUT 2
jack in the same way. First select “INPUT
2” via the front panel INPUT switch, then
follow the same procedure as described
above.
Initial Antenna Matching Procedure
Briefly key the transmitter, while watching
the SWR indicator in the display of the VL-
1000 (SWR calculation is automatic, so no
full-scale presetting is necessary).
If the SWR is above 1.5:1, activate the An-
tenna Tuning Unit to retune the impedance
presented by the antenna system, as follows;
Press the TUNER switch;
Press the TUNE switch;
Transmit a carrier from the exciter in the
CW or other continuous mode. Do not
attempt to perform antenna tuning by
whistling into the microphone in an SSB
mode, as the drive power delivered to
the antenna tuner’s microprocessor will
not be consistent.
During antenna tuning, a special Antenna
Tuning Meter display will be observed, show-
ing the progress of the SWR reduction as
well as showing a depiction of the relative
positions of the two Variable Capacitors in
the antenna tuner (VC-A and VC-B).
Operation
At the completion of the tuning process,
COMPLETECOMPLETE
COMPLETECOMPLETE
COMPLETE” will appear on the display.
Once tuning has been successfully com-
pleted, the display will shift to the Graphical
SWR Meter automatically. In this mode,
both the “before tuning” (THRU) and “after
tuning” (A/T) SWR conditions present at the
VL-1000’s current antenna jack will be
shown. As you move around the band, new
antenna tuning settings will be recorded on
the Graphical SWR Meter, giving you a clear
picture of the tuning action of the VL-1000’s
automatic antenna tuner.
If “
COMPLETECOMPLETE
COMPLETECOMPLETE
COMPLETE” does not appear, it means
that an excessively-high SWR exists on the
coaxial line; “
ERRORERROR
ERRORERROR
ERROR” will appear on the dis-
play, and either “
HI SWRHI SWR
HI SWRHI SWR
HI SWR” or “
PROTECTPROTECT
PROTECTPROTECT
PROTECT” will
come on to assist you in knowing the exact
nature of the fault. If either of these warn-
ing messages should appear on the display,
check the antenna, feedline, and antenna
connection.
If “
COMPLETECOMPLETE
COMPLETECOMPLETE
COMPLETE” appears after tuning, press
the OPERATE switch. The VL-1000 is now
ready for operation.
Note: During antenna tuning, the tuning car-
rier is passed through the power amplifier then
fed to a 20dB power attenuator circuit to mini-
mize interference to other operators; this power
reduction takes place even if the OPERATE
switch is on.
15


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