RFL Auxiliary Hybrid Chassis
RFL Electronics Inc.
March 29, 2005
3
(973) 334-3100
THEORY OF OPERATION
For this discussion, refer to the schematic diagram shown in Figure 3.
The X-Hybrid module is a transformer-type hybrid used to connect a transmitter and a receiver, or two
receivers, to a single line tuning unit. It provides impedance matching and signal separation, and
prevents mutual loading and interference. Signals can be accepted from an amplifier with a source
impedance of 50 Ohms with up to 10 Watts of output power.
The transmitted signals pass through a transformer hybrid formed from transformers L1 and L2. These
transformers each have two secondaries, interconnected so that the first secondary of one transformer
is in series with the second secondary of the other. One set of interconnected secondaries is connected
to the line tuning unit through edge connector A24/C24 (high) and A25/C25 (low). The other set of
secondaries is connected across balancing resistors R13/R14 which determine the amount of isolation
between four-wire ports.
The X hybrid can also be used to connect two transmitters to the same line tuning unit, resulting in
dual-channel transmission capabilities. In this application, one transmitter is connected across the
primary of L1 , and the other transmitter is connected across the primary of L2.
