Power Line Carrier ____________________________________________________________________
RF-MCGARDPRO
Hubbell Power Systems, Inc.
–
RFL™
Products
July 1, 2022
©2022 Hubbell Incorporated
5-62
5.6.4 Balance Board and External Amp Connection Board
The Balance Board plugs into the RF chassis to the right of the TX Filter and is shown below.
HEAT SINK
R3
R4
T1
K1
K2
3 2 1 3 2 1
J2
J3
1
2
J4
3
Figure 5-39. 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.
The HPS/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
Balance Board Jumper Settings
The Balance Board has three jumpers J2, J3 and J4 that must be set for proper system operation.
The jumper settings select either 50W or 100W operation and must be set in accordance with the