RFL 9780 RFL Electronics Inc.
September 8, 2001 18-17 (973) 334-3100
18.4 DUAL HYBRID MODULE
The RFL 9780 Dual Hybrid Module uses four hybrid transformers to connect a transmitter and receiver to a
single line tuning port. The Dual Hybrid provides a high degree of signal separation by isolating the local
transmitter signal from the local received signal and preventing the input impedance of the receiver from
loading the transmitter. The impedance characteristics of the three types of Dual Hybrid modules is shown
in the table below.
Assembly
Number
Receive Port Send Port 1 Send Port 2 Line Output Port
106620-1 50 Ohms 50 Ohms 50 Ohms 50 Ohms
106620-2 50 Ohms 50 Ohms 50 Ohms 75 Ohms
106620-3 75 Ohms 50 Ohms 50 Ohms 75 Ohms
18.4.1 SPECIFICATIONS
As of the date this manual was published, the following specifications apply to all RFL 9780 Dual
Hybrid Modules, except where indicated. Because all RFL products undergo constant refinement and
improvement, these specifications are subject to change without notice.
Insertion Loss (60 to 500 kHz):
Transmitting: Approximately 3.8 dB from either input port to line output port.
Receiving: Approximately 12.5 dB.
Transhybrid Loss (60 to 500 kHz):
Greater than 40 dB when operating with the specified termination impedance.
Internal Balance Range:
0.5 to 1.95 times the specified two-wire impedance.
Power Capacity:
10 Watts rms.
Two-Wire Line Impedance:
106620-1: 50 Ohms.
106620-2: 75 Ohms.
106620-3: 75 Ohms.
Second Harmonic Distortion:
At least 80 dB below the fundamental frequency.
Third Order Intermodulation Products:
At least 60 dB below the fundamental frequency.
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