Yaesu VL-1000, Техническое дополнение

Страница: 18 / 132

VL-1000 Technical Supplement
Alignment
VR1002: Reverse ALC (Slight power turn-down into 75
Ω
dummy load)
VR1001: Forward ALC (High Power)
(PO=1000 W on AVG PWR meter)
CNTL Unit Alignment Points
power are obtained, the FT-920 transceiver’s ALC
meter should have
six bars
illuminated. Other
transceivers should show mid-scale indication on
their ALC meter.
Ì
Unkey the transmitter when adjustment is suc-
cessful. Now press and hold in the INPUT switch
on the VL-1000 front panel for ½ second to exit
the ALC alignment mode.
Ì
If your VL-1000 is after prod. lot 002, key the
transmitter with the DRIVE or RF PWR con-
trol fully clockwise, adjust VR2001 for 1000 Watts
on the AVG PWR meter.
Forward ALC Adjustment (Low Power)
Ì
The transceiver should be left at 50.100 MHz in
the FM mode, with the transceiver’s DRIVE or
RF PWR control fully clockwise.
Ì
Press the LOW switch on the front panel of the
VL-1000. Now press and hold in the INPUT
switch for ½ second so as to enter the “ALC Align-
ment” mode once again.
Ì
Key the transmitter, and press the DISPLAY 1
(to increase the power) or the DISPLAY 2 key
(to decrease the power) so as to achieve 500
Watts output power as displayed on the AVG
PWR meter.
Ì
Return the transceiver to the receive mode. Press
and hold in the INPUT switch for ½ second to
exit the ALC Alignment mode.
Reverse ALC Adjustment
Ì
Press the ANT switch on the front panel to select
ANTENNA 2 (to which the 75
Ω
dummy load is
connected).
Ì
With the transceiver still set to 50.100 MHz in
the FM mode, set the DRIVE or RF PWR con-
trol of the transceiver fully clockwise. If neces-
sary, press the LOW switch to select high power
operation.
Ì
Press and hold in the INPUT switch for ½ sec-
ond to enter the “ALC Alignment” mode.