Module Descriptions, RFL 9508D RF Section
7.4
BALANCE BOARD
HEAT SINK
R3
R4
T1
K1
K2
3 2 1 3 2 1
J2
J3
1
2 J4
3
Figure 7-9. Balance Board
7.4.1
DESCRIPTION
The RFL 9508D 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 in Figure 7-9. It plugs into the RF chassis
just to the right of the Tx Filter as shown in Figure 7-1.
The function of the Balance Board is to provide the capability of connecting two 50W Amplifiers
together for 100W applications. In the event that one of the 50W Amps fails, the remaining power amp
will continue to run, with half of the power reaching the line, and the other half dissipated by the
balance board. The jumpers are used to select 50W or 100W operation as described in paragraph
5.2.2.3.
7.5
EXTERNAL AMP CONNECTION BOARD
The RFL 9508D 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 7-5.
RFL 9508D UCC
RFL Electronics Inc.
December 1, 2010
7-11
(973) 334-3100