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.
Summary of Contents for VL-1000
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Page 20: ...VL 1000 Technical Supplement Alignment Notes...
Page 21: ...VL 1000 Technical Supplement Block Diagram...
Page 22: ...VL 1000 Technical Supplement Interconnection Diagram...
Page 24: ...VL 1000 Technical Supplement CNTL Unit Notes...
Page 26: ...VL 1000 Technical Supplement CNTL Unit Chip Side...
Page 27: ...VL 1000 Technical Supplement CNTL Unit Lot 2 Circuit Diagram...
Page 28: ...VL 1000 Technical Supplement CNTL Unit Lot 2 Notes...
Page 30: ...VL 1000 Technical Supplement CNTL Unit Lot 2 Chip Side...
Page 37: ...VL 1000 Technical Supplement Tuner Unit Circuit Diagram...
Page 38: ...VL 1000 Technical Supplement Tuner Unit Notes...
Page 40: ...VL 1000 Technical Supplement Tuner Unit Chip Side...
Page 41: ...VL 1000 Technical Supplement Circuit Diagram Tuner Unit Lot 4...
Page 42: ...VL 1000 Technical Supplement Notes Tuner Unit Lot 4...
Page 44: ...VL 1000 Technical Supplement Chip Side Tuner Unit Lot 4...
Page 46: ...VL 1000 Technical Supplement Chip Side Tuner Unit Lot 7...
Page 50: ...VL 1000 Technical Supplement Tuner Unit Notes...
Page 51: ...VL 1000 Technical Supplement LPF Unit Circuit Diagram...
Page 52: ...VL 1000 Technical Supplement LPF Unit Notes...
Page 54: ...VL 1000 Technical Supplement LPF Unit Solder Side...
Page 55: ...VL 1000 Technical Supplement LPF Unit Lot 4 Circuit Diagram...
Page 56: ...VL 1000 Technical Supplement LPF Unit Lot 4 Notes...
Page 58: ...VL 1000 Technical Supplement LPF Unit Lot 4 Solder Side...
Page 63: ...VL 1000 Technical Supplement Divider Unit Circuit Diagram...
Page 64: ...VL 1000 Technical Supplement Divider Unit Notes...
Page 66: ...VL 1000 Technical Supplement Divider Unit Solder Side...
Page 67: ...VL 1000 Technical Supplement Circuit Diagram Divider Unit Lot 3...
Page 68: ...VL 1000 Technical Supplement Divider Unit Lot 3 Notes...
Page 70: ...VL 1000 Technical Supplement Solder Side Divider Unit Lot 3...
Page 74: ...VL 1000 Technical Supplement PA Unit Notes...
Page 76: ...VL 1000 Technical Supplement PA Unit Solder Side...
Page 77: ...VL 1000 Technical Supplement PA Unit Lot 5 Circuit Diagram...
Page 78: ...VL 1000 Technical Supplement PA Unit Lot 5 Notes...
Page 80: ...VL 1000 Technical Supplement PA Unit Lot 5 Solder Side...
Page 84: ...VL 1000 Technical Supplement PA Unit Notes...
Page 85: ...VL 1000 Technical Supplement Display Unit Circuit Diagram...
Page 86: ...VL 1000 Technical Supplement Display Unit Notes...
Page 92: ...VL 1000 Technical Supplement Display Unit Notes...
Page 93: ...VL 1000 Technical Supplement ANT SW Unit Circuit Diagram...
Page 94: ...VL 1000 Technical Supplement ANT SW Unit Notes...
Page 99: ...VL 1000 Technical Supplement Line Filter Unit Circuit Diagram...
Page 100: ...VL 1000 Technical Supplement Line Filter Unit Notes...
Page 102: ...VL 1000 Technical Supplement Line Filter Unit Notes...
Page 110: ...VL 1000 Technical Supplement Relay Unit Notes...
Page 112: ...VL 1000 Technical Supplement Filter Unit AC Power Supply VP 1000 Notes...
Page 114: ...VL 1000 Technical Supplement Filter Unit AC Power Supply VP 1000 Notes...
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