Return Amplifiers
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Return amplifiers combine return
trunk and feeder signals, amplify
them, and route them in the return
direction back toward the headend.
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T R U N K AM P M O DE L
8 -T 5 50
COMPLETE
CONTROL
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BRIDGER
MODEL:
6 - B5 50
Manual gain and slope controls
are accessible through the front
cover.
Compatible with all existing
Magnavox mainstations.
C om bin e
5 -R T C * /15 On ly
C has s is
D ebu m pe r
G
T
T ru nk
Inp ut
T herm a l C able
C ont ro l (plug-in)
P os tA mp
Pre-A m p
A ux
S lo pe
G ain
Low Pas s
F ilter
O utpu t
9-A Fe ede r
Att enua tor
(plu g-in )
F eed er
Pre-A m p
5-RT */15 and
5-RTC */15
F eed er Inp ut
The return amplifier accepts return
signals from the trunk and feeder
lines, combines and amplifies
these signals, and directs them
toward the headend along the
trunk path. Mounted on a die-cast
aluminum base, the module’s
circuitry lets you control slope and
gain manually or automatically.
The 5-RTC series modules come
with a plug-in board that provides
thermal compensation protection.
Read the return amplifiers
Ordering Information to determine
if you need to order and install
plug-in circuits for your return trunk
amplifier modules.
On the 5-RT 26, you control gain
and slope manually by adjusting
controls that are easily accessible
through the module’s cover. In
addition to this manual type of
control, the 5-RT 33/15 and the
5-RT 50/15 also offer an automatic
gain and slope control option.
8-1-96
RF Amplifiers-145
Mainstations
P
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Spectrum 2000
5-RT Series
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Return Amplifiers
Station Performance*
5-RT 26/15
5-RT 33/15
Notes & 5-RTC 26/15 & 5-RTC 33/15
Performance Measured in a 7-MC-2 */* Chassis
Technology
Bandwidth
Response Flatness
@ rated gain and slope (trunk/feeder)
a
Minimum Full Gain (trunk/feeder)
33/50
42/54
50/70
Push-Pull
Push-Pull
Push-Pull
Push-Pull
5 - 26
5 - 33
5 - 40
5 - 50
MHz
± 0.25/± 0.5
± 0.25/± 0.5
± 0.5/± 0.7
±0.25/±0.5
dB
16/16
16/16
15/15
16/16
dB
10
10
10
10
dB
0 - 7 @ 33
0 - 8 @ 40 MHz
MHz
0 - 9 @ 50 MHz
dB
0 - 6 @ 26 MHz
Return Loss (75-ohm ref. @ rated gain and slope)
Distortion at Rated Input Level (per NCTA test methods)
Units
26/45
Gain Control Range
Slope Control Range (cable)
5-RT 50/15
5-RT 40/15 & 5-RTC 50/15
16
16
16
16
dB
20
20
20
20
dBmV
b
Rated Input Level
Number of Analog Channels
4
4
4
7
Rated Operating Gain (trunk/feeder)
15/15
15/15
15/15
15/15
dB
Composite Triple Beat (trunk/feeder)
-88/-84
-88/-84
-83/-79
-88/-84
dB
Cross Modulation (trunk/feeder)
-80/-76
-80/-76
-77/-73
-80/-76
dB
Second Order (trunk/feeder)
-80/-72
-80/-72
-80/-72
-80/-72
dB
13/12.5
13/12.5
13/12.5
13/12.5
dB
Hum Modulation (at 8 amps maximum operating current)
-65
-65
-65
-65
dB
24 Volt DC Load Current (maximum)
320
320
320
320
mA
52 @ 550 MHz
52 @ 550 MHz
N/A
52 @ 550 MHz
dB
Length
6.2 (15.7)
6.2 (15.7)
6.2 (15.7)
6.2 (15.7) in. (cm)
Width
1.7 (4.4)
1.7 (4.4)
1.7 (4.4)
1.7 (4.4) in. (cm)
3.2 (8.1)
3.2 (8.1)
Noise Figure (trunk/feeder)
Cable Compensation—Thermal (RTC units only)
Mechanical Dimensions
Height
3.2 (8.1)
Weight
14.3 (405.4)
Plug-In Circuits (Required
Optional
Feeder Input Attenuator
14.3 (405.4) 14.3 (405.4)
3.2 (8.1) in. (cm)
14.3 (405.4)
)
9-A
9-A
9-A
9-A
*All specifications are subject to change without notice. Measured at 70° F ambient. Measured in a 9-TH housing and 7-MC-2 */* chassis.
9/30/94
Notes:
a. For models 5-RT 33/15, 5-RTC 33/15, 5-RT 50/15, and 5-RTC 50/15, measured with a 9-A-9 attenuator in the feeder leg.
b. Distortion specifications are worst case for system performance calculations; individual module performance may vary.
RF Amplifiers-146
8-1-96
oz (g)
Return Amplifiers
Ordering Information
To order, call your sales representative at 1-800-448-5171 (in NY State 1-800-522-7464).
Mainstations
The 5-RT series return amplifiers are available in several models, as indicated below.
5-RT _/D S S A _ _/_ _
C = T h e m a l C o m p e n sa tio n
2 6 /1 5 = 5 to 2 6 M H z (o rd e r 9 -A a tte n u a to rs s e p a ra te ly)
3 3 /1 5 = 5 to 3 3 M H z (o rd e r 9 -A a tte n u a to rs s e p a ra te ly)
5 0 /1 5 = 5 to 5 0 M H z (o rd e r 9 -A a tte n u a to rs s e p a ra te ly)
Model
Description
5-RT Series
Return Amplifiers
Push-pull return amplifiers with manual gain and slope controls. Available for different return
bandwidths:
5-RT 26/15
5-RT 33/15
5-RT 50/15
5-RTC Series
Return Amplifiers
Return bandwidth is 5 - 26 MHz.
Return bandwidth is 5 - 33 MHz.
Return bandwidth is 5 - 50 MHz.
Push-pull return amplifiers with manual gain and slope controls and a factory-installed thermal
compensation board. Available for different return bandwidths:
5-RTC 26/15
5-RTC 33/15
5-RTC 50/15
Return bandwidth is 5 - 26 MHz.
Return bandwidth is 5 - 33 MHz.
Return bandwidth is 5 - 50 MHz.
8-1-96
RF Amplifiers-147
Return Amplifiers
Ordering Information
To order, call your sales representative at 1-800-448-5171 (in NY State 1-800-522-7464).
Plug-in Circuits
The 5-RT series return amplifier accepts an optional 9-A series plug-in attenuator, as shown below.
R eturn A m p
5R T * /*
9 -A F e ed er
A tte nua tor
(un de r the co v er)
S lo p e
G a in
M a d e in U S A
Model
Description
Optional 9-A
Series
Attenuators
All 5-RT and 5-RTC series return amplifiers accept an optional 9-A series attenuator. This
circuit plugs into the module’s main circuit board and is used to attenuate the feeder input to
the return module.
The 9-A series attenuators are available in 0.5 dB steps from 0 to 26 dB.
To find the value of feeder input attenuator needed, subtract the loss (in dB) of the bridger
splitter (feedermaker) from nine.
dB value of feeder input attenuator ( in dB)
RF Amplifiers-148
8-1-96
=
9
−
loss of feedermaker (in dB)