Assembly Instructions Chapter 4

4-6 kW UHF Translator Chapter 4, Circuit Descriptions
837B, Rev. 0 4-38
Line 2 to Line 3, VR3 from Line 1 to
Line 3, VR4 from Line 1 to Ground, VR5
from Line 2 to Ground and VR6 from
Line 3 to Ground.
For single phase, connect Line 1 to
TB1-1A, Line 2 to TB1-3A and Ground
to TB1-4A. The AC Distribution Panel
contains Circuit Breakers that supply
the AC to the rest of the Amplifier
Assembly. The Input AC from TB1 is
connected to (CB1) the Main AC Circuit
Breaker (100 Amps) that distributes
the 220 VAC to the other circuit
breakers (CB2-CB9). The output of
CB1 has three MOVs, VR4 from Line 1
to Ground, VR6 from Line 2 to Ground
and VR3 connected across the legs.
The switched Input AC is wired through
six Circuit Breakers, CB2-CB7, to the
six UHF Amplifier Trays in the Amplifier
Array Cabinets. CB2 is a 20 Amp
Circuit Breaker that supplies the AC
voltage to the (A1) UHF Amplifier Tray.
CB3 is a 20 Amp Circuit Breaker that
supplies the AC voltage to the (A2) UHF
Amplifier Tray. CB4 is a 20 Amp Circuit
Breaker that supplies the AC voltage to
the (A3) UHF Amplifier Tray. CB5 is a
20 Amp Circuit Breaker that supplies
the AC voltage to the (A4) UHF
Amplifier Tray. In 5 & 6 kW, CB6 is a
20 Amp Circuit Breaker that supplies
the AC voltage to the (A5) UHF
Amplifier Tray. In 6 kW, CB7 is a 20
Amp Circuit Breaker that supplies the
AC voltage to the (A6) UHF Amplifier
Tray. CB8 and CB9 are 3 Amp circuit
breakers that supply AC to the two
cooling fans located in the Reject Load
Assembly.
When the Circuit Breaker CB1 on the
AC Distribution Assembly in the UHF
Exciter Assembly is switched On, +12
VDC from the Exciter is supplied to
each of the Amplifier Array Cabinets.
In the Amplifier Array, the +12 VDC is
split and connected to each of the UHF
Amplifier Trays for operation of the LED
Status Indicators in the Tray. +12 VDC
from the Exciter is also supplied to each
of the (Optional) External Exhaust Kits
in the Amplifier Array Cabinets for
operation of the isolation relays.
4.7 {A1, A2, A3, A4, A5(5&6kW) &
A6(6kW)} UHF Amplifier Trays,
LDMOS (1301560 low
band/1301561 mid band/1301562
high band; Appendix C)
The LDMOS amplifier tray, with an RF
input of approximately +3 dBm,
provides a maximum power level of
+57.8 dBm, 600W + sound. All the
amplifier modules are broadband in
nature and require no tuning.
4.7.1 (A2) Variable Gain/Phase
Board Enclosure (1301548;
Appendix D)
The variable gain/phase enclosure
assembly provides EMI and RFI
protection for the variable gain/phase
board (1301549) that is mounted
inside of the assembly.
The RF input to the assembly is at SMA
jack J1 and the RF output is at SMA
jack J2. There are two control inputs
that connect to the assembly: the
attenuator bias input and the phase
control input. The attenuator bias input
from the amplifier control board
connects to FL4 and FL5 on the
assembly and is wired to J5 on the
board. The phase control input from the
amplifier control board connects to FL2
and E1 on the assembly and is wired to
J4 on the board. The input fault to the
amplifier control board connects to FL3
on the assembly and is wired to J6-1 on
the board. Ground E1 on the assembly
connects to J3-4 on the board.
The +32 VDC needed to operate the
board connects to FL1 on the assembly
which is wired to J3-3 on the board.