9.2.4
BALANCE BOARD
HEAT SINK
R3
R4
T1
K1
K2
3 2 1 3 2 1
J2
J3
1
2 J4
3
Figure 9-8. Balance Board
9.2.4.1
DESCRIPTION
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 in Figure 9-8. It plugs into the RF chassis just to the
right of the Tx Filter as shown in Figure 9-2.
The function of the Balance Board is to provide the capability of connecting two 50W Amplifiers in
parallel 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 paragraph 9.6.3.
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 9-15.
RFL 9785
RFL Electronics Inc.
May 16, 2011
9-10
(973) 334-3100