350-Watt Digital VHF LB Transmitter
Chapter 2, System Description, Maintenance &
Remote Control Connections
DT325B, Rev. 0
2-5
Table 2-7: VHF Amplifier Tray Switches
SWITCH
FUNCTION
CB1
On/Off Circuit Breaker
Switches 220 VAC through a 15-amp circuit breaker-type
protection device. The switch lights if AC is present. The
AC is applied to the switching power supply in the tray.
Selects the desired % Forward Output Power, % Reflected
Power reading, AGC Voltage, Power Supply Voltage, or
Current
With Switch S1 in
Position
Display
% Forward
Reads the % Forward Output
Power of the tray (100%= 375
watts DTV)
% Refl (Reflected)
Reads the % Reflected Output
Power (<5%)
AGC Voltage
Reads the AGC level of the tray
(1 to 3 VDC)
Power Supply
Reads the voltage from the
switching power supply
(+28 VDC)
S1
Switch, Meter
Current
Uses Switch S2 to indicate the
current of transistor devices
Selects the current of the transistor devices on the low band
amplifier boards. S1 must be in the Current position.
With Switch S2 in
Position
Display
I
1
Reads the current of (A3-A1)
the low band amplifier board
(idling current=1.8 amps and
operating current=12-13 amps,
black picture)
I
2
Reads the current of (A3-A2) the
low band amplifier board (idling
current=1.8 amps and operating
current=12-13 amps, black
picture)
I
3
Reads the current of (A3-A3)
the low band amplifier board
(idling current=1.8 amps and
operating current=12-13 amps,
black picture)
S2
Switch, Meter
I
D
Reads the current of (A2-A1) the
low band amplifier board (idling
current=3 amps and operating
current=3 amps, black picture)
