RFL 9780 Installation and user guide

RFL Auxiliary Hybrid Chassis RFL Electronics Inc.
March 29, 2005 1 [phone]
RFL Electronics Inc.
I N S T R U C T I O N D A T A
RFL 9780/9785
Auxiliary Hybrid Chassis
Figure 1. RFL 9780/85 Auxiliary Hybrid Chassis, front view
DESCRIPTION
Hybrids are optional modules for the RFL Powerline Carrier equipment. They may be used to combine
combinations of transmitters and receivers to a single port for connection to line tuning units. There is
an X-Hybrid Module and a Skewed Hybrid Module available. Each of these modules uses the same
basic printed circuit board.
The Auxiliary Hybrid Chassis shown in Figure 1 is used to add X-Hybrid modules or Skewed Hybrid
modules to RFL Powerline Carrier systems. Each Auxiliary Hybrid is contained in a 19-inch chassis
that occupies less than one rack unit of vertical rack space (1.718 inches, or 4.4 cm). Each chassis can
accommodate three Hybrid modules and three Hybrid I/O modules. The Hybrid modules are mounted
in the front of the chassis, and the Hybrid I/O modules are mounted at the rear of the chassis. In a
given chassis the Hybrid modules can be a mix of any combination of X-Hybrid modules or Skewed
Hybrid modules.
A
UXILIARY HYBRID CHASSI
S
RFL Electronics Inc.

RFL Auxiliary Hybrid Chassis RFL Electronics Inc.
March 29, 2005 2 [phone]
X HYBRID MODULE
The X-Hybrid Module is a transformer-type hybrid typically used to combine the outputs of two
transmitters. The X-Hybrid provides the required impedance matching and signal separation, and
prevents mutual loading of the two transmitters. The impedance characteristics of the two types of X-
Hybrid modules is shown in the table below.
Assembly Number Receive Send Line
106630-1 50 Ohms 50 Ohms 50 Ohms
106630-2 50 Ohms 50 Ohms 75 Ohms
SPECIFICATIONS
As of the date this manual was published, the following specifications apply to all X-Hybrid Modules,
except where indicated. Because all RFL products undergo constant refinement and improvement,
these specifications are subject to change without notice.
Insertion Loss:
Approximately 3.5 dB, either input port to line output port.
Transhybrid Loss:
Greater than 25 dB, from 60 to 500 kHz, when operating with the specified termination
impedances.
Power Capacity:
10 Watts rms.
Two-Wire Line Impedance:
50 Ohms standard; other impedances are available on special order.
Second Harmonic Distortion:
At least 80 dB below the fundamental frequency.
Third Order Intermodulation Products:
At least 60 dB below the fundamental frequency.

RFL Auxiliary Hybrid Chassis RFL Electronics Inc.
March 29, 2005 3 [phone]
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.

RFL Auxiliary Hybrid Chassis RFL Electronics Inc.
March 29, 2005 4 [phone]
CONTROLS AND INDICATORS
Figure 2 shows the location of all controls, indicators and components on the X-Hybrid Module. The
controls and indicators are described in Table 1. Only TP5, TP6, TP7 and TP8 are accessible with the
X-Hybrid Module installed in the chassis. All others are accessible when the module is removed from
the chassis or is on a card extender.
P1
L2
TP4
J1
R14 R13
F1
L1
TP3
TP5
TP6
TP7 TP8
9780/85 HYBRID ECB NO. 106623 REV-A
DUAL SINGLE
2000 RFL ELECTRONICS INC., BOONTON, NJ, U.S.A.
TX1 RXTX2
E C N A L A B
HI LOLOLO HIHI
B A
32
AC 1
1
1
1
1
Figure 2. Controls, indicators, and component locations, X-Hybrid Module
TP8
TP7
J1
TP6
TP5
TP4
TP3

RFL Auxiliary Hybrid Chassis RFL Electronics Inc.
March 29, 2005 5 [phone]
Table 1. Controls and indicators, X-Hybrid Module
Component
Designator
Name/Description Function
J1 Jumper Should always be in the A position.
TP3 Test point Line High (orange)
TP4 Test point Line Low (orange)
TP5 Test point Receive High (green)
TP6 Test point Receive low (yellow)
TP7 Test point Send High (red)
TP8 Test point Send Low (white)
Table 2. Replaceable parts, X-Hybrid module
Assembly No. 106630-1 and –2
Circuit Symbol
(Figs. 2 & 3)
Description Part
Number
F1
J1
L1
L2
P1
R13, 14
TP3, 4
TP5
TP6
TP7
TP8
MISCELLANEOUS COMPONENTS
Fuse, SLO-BLO, 10A, 32V, 3AG
Connector, header, single, 3CKT
Transformer, hybrid, 50 ohm, XMIT
106630-1
106630-2
Transformer, hybrid, 50 ohm, XMIT
106630-1
106630-2
Connector, JK, male, 64 contact, DIN
Resistor, wirewound, 100Ω, 5%, 10W
Test point terminal, orange
Test point, green
Test point, yellow
Test point, red
Test point, white
10758
32802 3
55768
55768
55768
55769
98457
100 795
98441 3
38116 5
38116 8
38116 2
38116 1

RFL Auxiliary Hybrid Chassis RFL Electronics Inc.
March 29, 2005 6 [phone]
1
3
4
6
7
9
12
C28
A27
C17
1
3
4
6
7
9
12
A24
A25
A22
A21
C31
C20
1
3
4
6
7
9
12
C19
A18
C24
C25
C18
A19
C30
1
3
4
6
7
9
12
C27
C21
C22
C23
C26
C29
C32
A32
A29
A26
A23
A20
A17
1
2
3
A28
A30
A31
L1
L4
TP4
SW1
R15R16TP2
J2
TP1
TP10
J1
TP5 TP6
J3
R6
R1
R3
L2
R5
TP3
TP8
F1
R10
R11
R7
R8
R9
TP9
TP7
R2
CR1
R14
R13
L3
R4
J5 J4
1
2
3
4
5
6
10W
100
10W
100
5W
50
1w
100
1W
100
2.5W
50
10A
.5W
12.1
.5W
12.1
2.5W
12
2.5W
12
.5W
12.1
1W
100
PO800EA
10W
100
10W
100
100
2W
CW
(SEECHART)
(SEECHART)
55769
55768
55768
55768
50-50-75
50-50-50
TX1-TX2-LINE
X-HYBRID#L2
L1
IMPEDANCE(OHMS)
-2
-1
NOT
INSTAL
LED
INPLACEOFJ2
INSTALLWIREJUMPER
NOTINSTALLED
NOTINSTALLED
TX
SINGLE
DUAL
SINGLE
DUAL
TX2
TX1
YEL
GRN
WHT
RED
HI
LO
LO
LO
HI
HI
TOLINE
AINT
EXTB
BALANCENETWOR
K
BALANCENETWORK
RX
I-LIMIT
TERM.
OUT
IN
OUT
IN
TOOPTIONALPRECISIO
N
CW
LO
HI
LO
HI
YEL
GRN
LO
HI
LO
HI
CHASSIS
Figure 3. Schematic, RFL 9780/85 X-Hybrid (D-106634-A)

RFL Auxiliary Hybrid Chassis RFL Electronics Inc.
March 29, 2005 7 [phone]
SKEWED HYBRID MODULE
The Skewed Hybrid Module uses two hybrid transformers to connect a transmitter and receiver to a
single line tuning port. The Skewed 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 two types of Skewed-
Hybrid modules is shown in the table below.
Assembly Number Receive Send Line
106625-1 50 Ohms 50 Ohms 50 Ohms
106625-2 50 Ohms 50 Ohms 75 Ohms
SPECIFICATIONS
As of the date this manual was published, the following specifications apply to all Skewed 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 0.3 dB.
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:
50 Ohms standard; other impedances are available on special order.
Second Harmonic Distortion:
At least 80 dB below the fundamental frequency.
Third Order Intermodulation Products:
At least 60 dB below the fundamental frequency.

RFL Auxiliary Hybrid Chassis RFL Electronics Inc.
March 29, 2005 8 [phone]
THEORY OF OPERATION
For this discussion, refer to the schematic diagram shown in Figure 5.
The Skewed Hybrid Module uses two hybrid transformers to couple signals between a transmitter, a
receiver, and a 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 and received signal passes through a 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). This
allows both the transmitter and the receiver to be coupled to the line tuning unit. The other set of
secondaries is connected across the internal balancing network formed by resistors R4 through R11.
The coarse balance switch SW1 and fine balance potentiometer R4 can be adjusted to vary the
resistance across the transformer secondaries, which determines the amount of transhybrid loss.
The transmitter output is connected across the primary of L1, and the receiver input is connected
across the primary of L2. Transmitter output signals are coupled through L1 to the line tuning unit, and
incoming signals detected by the line tuning unit are coupled through L2 to the receiver. Transmitted
signals are attenuated by about 0.3 dB as they pass through the Skewed Hybrid module, and received
signals are attenuated by about 12.5 dB. Because both the received signal and its noise content are
attenuated equally, signal-to-noise ratios are unaffected.

RFL Auxiliary Hybrid Chassis RFL Electronics Inc.
March 29, 2005 9 [phone]
CONTROLS AND INDICATORS
Figure 4 shows the location of all controls, indicators and components on the Skewed Hybrid module.
The controls and indicators are described in Table 3. Only TP5, TP6, TP7, TP8, SW1 and R4 are
accessible with the Skewed Hybrid Module installed in the chassis. All others are accessible when the
module is removed from the chassis or is on a card extender.
Figure 4. Controls, indicators, and component locations, Skewed Hybrid Module
TP6
TP5
TP8
TP7
TP4
TP3
R4
SW1
J1
J3
J2

RFL Auxiliary Hybrid Chassis RFL Electronics Inc.
March 29, 2005 10 [phone]
Table 3. Controls and indicators, Skewed Hybrid Module
Component
Designator
Name/Description Function
J1 Jumper Should always be in the A position
J2 Jumper Enables the protection circuit with current limiting. The “IN” position enables
current limiting. The “OUT” position disables current limiting.
J3 Jumper Enables 50 Ohm termination. The “IN” position enables the termination. The
“OUT” position disables the termination.
SW1 Switch Coarse adjustment for balancing network
R4 Potentiometer Fine adjustment for balancing network
TP3 Test point Line High (orange)
TP4 Test point Line Low (orange)
TP5 Test point Receive High (green)
TP6 Test point Receive low (yellow)
TP7 Test point Send High (red)
TP8 Test point Send Low (white)
SELECTING RECEIVE PORT PROTECTION AND TERMINATION
The receive port of the hybrid contains protection circuitry for the receiver’s front-end, and line
termination resistance. These features are similar to those used in the RF Line I/O, and may be
individually selected by using jumpers J2 and J3 as described in Table 3. Transient suppressor CR1
limits the voltage to the receiver and resistor R1 limits the current. Jumper J2 is used to bypass R1
when current limiting is not desired. J3 is used to enable the 50 Ohm termination resistance. The power
dissipated by the termination should be limited to 1W.
The protection circuit should be placed as close as possible to the receiver and the termination should
be placed at the end of the signal path. In a chassis with a single rear UHF connector, the termination
and protection should be enabled (“IN”) on the hybrid. The received signal is then wired directly to the
receiver circuits.
If the received signal is sent to a UHF connector on the line I/O (e.g. to go to another receiver), both
the termination and protection should be omitted from the hybrid (“OUT”). The received signal out of
the hybrid is sent to the line I/O’s UHF connector. Following the connector is the termination resistor.
If this is the last, or only receiver using this signal, the termination on the I/O should be enabled. The
protection circuit is always enabled on the I/O when connected to the local receiver, to protect the
local receiver. This configuration protects the receiver from line disturbances passed through the
hybrid and also protects against any transients applied to the UHF connector.
The termination must never follow any current limit resistance. The signal should be wired directly
from the protection circuit to the receiver, and each receiver should have protection.