Module Descriptions, RFL 9508D RF Section
7.3
TX FILTER
CONNECTOR
(Plugs Into Mother Board)
PC BOARD
107828-2
PC BOARD
107828-1
AIR CORE
INDUCTOR
L2
AIR CORE
INDUCTOR
L1
COIL LOCKING SCREWS
Figure 7-8. Tx Filter, Top View
7.3.1
DESCRIPTION
The RFL 9508D Tx Filter is a plug-in module consisting of two PC boards and two air core inductors. It
plugs into the left side of the RF chassis as shown in Figure 7-1.
The primary function of the Tx Filter is to filter out harmonics that are out of the bandwidth of the filter.
The bandwidth of the filter can be set to either 8kHz or 16kHz using two programmable jumpers, J1 and
J45. The filter center frequency is tunable from 24kHz to 496kHz using programmable jumpers. The outer
edges are 20kHz and 500kHz. The 8kHz bandwidth is used for one or two RF channel operation and the
16kHz bandwidth is used for three for four RF channel operation.
The secondary function of the Tx Filter is to allow parallel connection of additional PLC terminals by
providing a high impedance to RF frequencies that are out of band.
RFL 9508D UCC
RFL Electronics Inc.
December 1, 2010
7-10
(973) 334-3100