CT-SFMM - Cabletronix
INSTALLATION MANUAL
CT-SFMM
Fixed Channel Mono Audio/Video
Micro Modulator
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PACKAGE CONTENTS
This package contains:
One CT-SFMM mono Audio/Video Micro Modulator
One CT-SFMM Installation Manual
PRODUCT DESCRIPTION
The CT-SFMM is a professional quality, channelized, heterodyne audio/video SAW filtered micro
modulator The unit provides a mono audio and video modulated RF carrier output on any single
CATV channel from 2-13 & 14-88 (A-ZZZ). The CT-SFMM is ideal for placing audio and video onto
any unused CATV channel. Different standard audio/video sources, such as satellite receivers,
television cameras, video tape recorders, or television demodulators can be used. The CT-SFMM
takes baseband audio and video and modulates these signals onto the desired output channel. The
heterodyne conversion process used in the CT-SFMM employs a crystal referenced, PLL
synthesized local oscillator that guarantees a rock solid, no-drift output for the life of the modulator.
The CT-SFMM also meets FCC Docket 21006 aeronautical frequency offset requirements. The
modulator accepts standard composite video in the range of 0.7 to 2.5 V p-p.
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SPECIFICATIONS
CT-SFMM
Fixed channel mono Audio/Video Micro Modulator Specifications (Typical)
RF
1. Frequency Range
CATV Channels 2 – 88, fixed channel
2. Output Level
+45 dBmV
3. Output Level Adjust
0 ~ -10 dB
4. Aural/Visual Carrier Ratio
-9 ~ - 20 dB
5. Visual Carrier Frequency Tolerance
Standard Channels
±10kHz
FCC Aeronautical Channels
±5kHz
6. Aural Carrier Frequency
+4.5Mhz
7. Aural Carrier Accuracy, Settable
±1.5kHz
8. Spurious Outputs
-60 dBc
9. C/N Ration In Channel
60 dB typical
10. Broadband Noise
-90 dBc
11. Output Impedance
75 ohm
12. Output Return Loss
12 dB
VIDEO
1. Input Level
0.5 to 2.0 V p-p
2. Frequency Response
±1.0 dB
3. Differential Gain
±4%
4. Differential Phase
±2˚
5. Video SNR Weighted
60 dB typical
6. Input Impedance
75 Ohms
AUDIO
1. Input Impedance
5K Ohms
2. Baseband Input Level
0.5V p-p for 25kHz peak deviation
3. Preemphasis
75 microseconds
4. Flatness
1.5 dB max. 50 Hz to 15 kHz
5. Test Tone
Frequency
10.396kHz ±50Hz
Amplitude
0.5 V p-p ±10%
6. Pre-Emphasis Mono
75µs
Total Harmonic Distortion
1.00%
Input Impedance – Unbalanced
10kΩ
7. Sub-Carrier Audio
Frequency
4.5MHz
Stability
±5kHz typical
GENERAL
1. DC Input Power
+5VDC (35mA), +12VDC (35mA) maximum
2. Power
2.25 W maximum
2. Operating Temperature
32 ˚F ~ 122 ˚F
MECHANICAL
1. Dimensions
1.15”(W)” x 3.5” (H) x 10.25” (D)
2 .Weight
0.65 lbs.
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INSTALLATION AND OPERATION
NOTE TO SYSTEM INSTALLER
System installer must adhere to Article 820-40 of the NEC that
provides guidelines for proper grounding and specifies that the
cable ground shall be connected to the grounding system of the
building, as close to the point of cable entry as practical.
1. UNPACKING and HANDLING
Each unit is shipped assembled and factory tested.
Ensure that all accessories are removed from the container before discarding packing material
2. MECHANICAL INSPECTION
Inspect the front and rear of the equipment for shipping damage. Make sure the equipment is
clean, and no connectors are broken, damaged, or loose. If equipment appears to be damaged
or defective please contact your distributor or Cabletronix at 1-610-429-1511 for assistance.
3. THE USE OF RACK MOUNTABLE CHASSES AND POWER SUPPLIES
The CT-SFMM is designed to be mounted in a rack chassis designed for micro modulators, and
powered by power supplies intended for micro modulators and designed to fit in the micro
modulator rack chassis. The Cabletronix CTRC-12 12-unit rack chassis, and the Cabletronix
CTPS-12 single 12-unit power supply or Cabletronix CTPS-12DUAL redundant power supply
should be used with the CT-SFMM. Up to 12 CT-SFMMs can be configured into a single
CTRC-12.
Some chassis and power supplies from other vendors and distributors may also be used, but
actual configurations will vary by vendor. It is critical to note that (a) the power supply harness
being used MUST come from the vendor providing the power supply, (b) the power supply must
be designed for powering micro modulators and installation in a micro modulator rack chassis,
and (c) power supply harnesses and power supplies are NOT always interchangeable among
vendors. Using the wrong power supply harness and/or power supply can damage the
CT-SFMM. Contact your distributor for more information.
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4. PRODUCT DIAGRAM
FRONT and REAR PANELS
i
1
j
2
k
3
4
l
5
h
1
2
3
4
Audio Modulation Adjust
Video Modulation Adjust
Power Indicator Light
A/V Ratio
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RF Output Level
6
7
8
9
10
Fixed Channel Indicator
Video Input
Audio Input
Power
RF Output
Adjust aural carrier modulation (volume adjustment)
Adjust video carrier modulation (brightness adjustment)
Indicates when power is present
Adjust the amplitude of the aural RF carrier to change
the aural/visual ratio
Adjust the amplitude of aural and visual carriers to the
final drive amplifier
Indicates fixed channel for this modulator
F Type, female
RCA Type, female
3 Pin Locking Header
F Type, female
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5. HARDWARE CONNECTIONS
a. The CT-SFMM is designed for installation in a chassis designed for micro modulators.
Micro modulator chasses such as the Cabletronix CTRC-12 can be mounted in
standard 19” EIA racks.
b. The Cabletronix CTRC-12 12-unit rack chassis and Cabletronix CTPS-12 single
12-unit power supply or CTPS-12DUAL redundant power supply should be used with
the CT-SFMM.
Up to 12 CT-SFMMs can be configured into a single
CTRC-12/CTPS-12. Some chassis and power supplies from other vendors and
distributors may also be used, but actual configurations will vary by vendor. Contact
your distributor for more information.
c.
The CTRC-12 rack chassis can hold up to 12 CT-SFMMs and other micro modulators
and demodulators of the same size. However, note that some other products such as
the Cabletronix CT-AHP require two slots in a CTRC-12 resulting in the chassis
supporting 6 units instead of 12.
d. When configuring the CT-SFMM in the chassis and power supply it is critical that the
power harness being used is from the same vendor as the power supply, and is
designed for that specific supply. Power supply harnesses among vendors are not
interchangeable and can severely damage the CT-SFMM.
e. The use of a surge protector is highly recommended. Product warranty does not cover
surge damages.
f.
Connect a 75 ohm coaxial cable with proper connectors from the video source’s
Video Output port to the CT-SFMM’s Video Input port (F-female connector).
g. Connect a 75 ohm coaxial cable with proper connectors from the source’s Audio
Output port to the CT-SFMM’s Audio Input port (RCA female connector).
h. Connect a 75ohm coaxial cable with F-connectors from the CT-SFMM’s RF Output
port to the headend combiner or amplifier.
6. ADJUSTMENT
a. After installation and completing all hardware connections power the unit and wait 20
minutes before making the following adjustments.
b. For testing purposes no more than 15 dB from the RF Output should be going to a TV
or RF input monitor. Use an attenuator to reduce the signal level if testing with an RF
input monitor. Individual CT-SFMM setup and level settings can be performed from the
RF Output port. However, system level testing should be done from the combiner.
c.
With a nominal 1 V p-p video source connected, use the Video Modulation Adjust
control to adjust the video modulation level for correct percentage of modulation
(87.5%) if the video input is greater than 2.0 V p-p. If test equipment is not available
then adjust for proper picture contrast when viewed on a TV monitor and compare with
known Off-Air broadcast picture quality.
d. With the audio source connected, adjust the Audio Modulation Adjust control for
25kHz deviation. If you do not have an audio modulation meter and a precision
demodulator, use a TV set or a signal level meter with an audio speaker and adjust for
equal volume as compared to a known Off-Air broadcast. Monitor for a few minutes to
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assure the maximum volume does not over modulate, which can cause distortion.
e. To adjust the picture carrier to audio sub-carrier ration of the output signal, rotate the
A/V Ratio adjustment.
f.
To adjust the output, rotate the RF Output Level control.
7. TROUBLESHOOTING
a. Ensure you are using quality multiple shielded cables with quality radial or
compression F-connectors. It is recommended Belden 9167 cable be used to prevent
signal ingress or egress.
b. Ensure the cables’ center conductors are making solid contact with the CT-SFMM’s
Video Input, Audio Input, and RF Output ports.
c.
If the CT-SFMM is receiving power but no signal, check to be sure the video and/or
audio input cables are securely connected to their respective Video Output and Audio
Output ports on the video source, and the Video Input and Audio Input ports on the
CT-SFMM. Ensure the cable is securely connected at the CT-SFMM’s RF Output
port and the combiner’s input ports.
d. When taking measurements it is always best to use a quality signal level meter. For
individual CT-SFMM setup measurements may be taken from the unit’s RF Output
port. System level measurements, however, should be taken from the combiner’s
output.
e. If the CT-SFMM is not receiving power make sure the power cable is firmly connected.
Be sure the power source is properly rated to handle the CT-SFMM’s load especially if
other equipment is being powered by that same source.
f.
It is highly recommended the CT-FANRK 3-unit rack mountable fan be used as
significant heat reduction may double the CT-SFMM’s life span.
g. Further troubleshooting assistance can be found on-line at www.cabletronix.com in
addition to support from Cabletronix sales engineers at 1-610-429-1511.
This is a notice to inform you that content passing through this device may contain strong language
or depictions of violence, sex, or substance abuse. This unit contains no parental control features.
Parental discretion is advised.
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