Power Line Carrier
GARD 8000 SYS RFL Electronics
April 23, 2015 10-24 973.334.3100
10.8.4 BALANCE BOARD AND EXTERNAL AMP CONNECTION BOARD
The RFL 9508 Balance Board is a plug-in module consisting of a PC board, a transformer, two power
resistors, two relays, three jumpers (J2, J3 and J4) and various other components. It has an aluminum
heat sink covering a portion of the board as shown below. It plugs into the RF chassis, just to the right
of the Tx Filter as shown in Figure 10-8.
Figure 10-15. Balance Board
The function of the Balance Board is to provide the capability of connecting two 50W Amplifiers
together for 100W applications. In the event of one of the 50W Amps failing, it sinks half of the power
output of the remaining Power Amp. The jumpers are used to select 50W or 100W operation as
described in Section 10.8.13.3
The RFL 9508 External Amp Connection Board is a plug-in module consisting of a PC board with
wire jumpers only and uses the same PC board as the Attenuator Board. It is used in place of the
Balance Board in the external RF Chassis for 100W applications as shown in Figure 10-23.
2 J4
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