Space Television MOD-SCM08 User manual

HELPLINE 0861 40 41 42 • www.spacetv.co.za
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TV ModulaTor
MOD-SCM08
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directive 2002/96/EC.
According to the directive, waste electrical and electronic equipment may not be treated as municipal
waste, but should be delivered to a specialized collection point for processing and recycling.
Suitable handling of wast equipment prevents potential negative consequences for the environment
and human health.
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MOD-SCM08 TECHNICAL SPECIFICATIONS
Video input
Frequency range 100 Hz-6 MHz
Input level/ impedance 1,0V / 75Ω
Input level adjustment 0…-20dB
Audio input
Frequency range 20 Hz-15 kHz
Input level/ impedance 0,7V RMS/1kΩ/50kHz
Input level adjustment 0…-20dB
RF output
Output level/ impedance 85dBmV/75Ω
Output level adjustment 0…-20dB
Channel / frequency range PAL I South Africa*:
S3-S41, ch4-ch12, ch21-ch69:
111,25...855,25 MHz
B/G CCIR*:
S1-S41, ch5-ch12; ch21-ch69:
105,25...855,25 MHz
Frequency stability ±50kHz
Audio carrier frequency 6,0 MHz (I South Africa); 5,50 MHz (B/G)
Attenuation RF input / RF
output
3dB ±1,5dB
Frequency range for RF
input
47-1000 MHz
A/V carrier ratio 13dB
Audio modulation depth 83%
Power supply +12V/250mA
Operating temperature
range
10°C… +55°C
Dimensions 94x88x24mm
Weight 0,3kg
* Due to the integrated circuit used in the MOD-SCM08, the modulation of TV signal in channels ch12, 13 and S14 - S17 in the PAL I South Africa
standard and in channels S4, S5 and S12 - S19 in the PAL B/G standard is blocked.
Fig. 3. Typical modulator connection with
power inserter and summing of the signal
from TV antenna and cooperation with a
camera supplied from the modulator.

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Sample modulator settings: ch.56, standard I, TEST signal o:
Fig. 2. Typical modulator connection with power inserter and summing of the signal from TV antenna.
TYPICAL APPLICATION OF THE MODSCM08 MODULATOR
INTENDED USE AND FEATURES OF THE MODULATOR
MOD-SCM08 is a mono, double side band (DSB) TV modulator designed to operate with A/V
household devices – video recorders, DVD players, satellite receivers, CCTV camera, etc. The TV
modulator converts low frequency signal (Audio and Video) from A/V devices into high-frequency
signal in TV channel range. Modulated signal may be transmitted for long distances thorough
a coaxial cable, connected to the antenna input or split into a few TV sets with a splitter. The
modulator also makes it possible to sum its high-frequency signal and other HF signals (eg from a
TV antenna). Signal summing eected in the RF input. MOD-SCM08 may operate as stand-alone
device or in SCM08 mini headend station. In the standalone conguration modulator may be
supplied locally from +12V/250 mA external power supply. In the other case, the modulator uses
the SCM08 power supply. The power is supplied through the DC IN port or the RF output using a
coaxial cable and a power inserter. Then, the power is also supplied to the DC port from which a
CCTV can also be supplied.
MOD-SCM08 can operate in the frequency range from channel S3 to ch69 (I South Africa standard)
or from channel S1 to ch69 (B/G standard). It is possible to enable the TEST signal which facilitates
programming of the selected TV signal in a TV set. Modulator programming involves putting the
keys of 10-segment switch in required position. Audio and Video inputs and RF output have the
gain control of respectively, input and output signal. The POWER LED signals the modulator status:
 •continuouslylit–correctoperatingparameters
 •fastashing-incorrectoperatingparameters
 •slowashing–testsignalon
INSTALLATION OF THE MODULATOR
• Setrequiredoperatingparameters(TVstandard,outputchannel,testsignal)
• IftheRFoutputisnotused,connecttoita75Wload(resistorisincludedintheset).
• Fixametalbracket,ifthemodulatorismountedonawallorotherat(non-combustible)
surface.
• Connectaudioandvideosignaltorelevantinputs(Audio,Video)usingsuitablecables;connect
a TV set to the RF output.
• Connecta+12VDCpowersupplytotheDCINport(thepowersupplyisnotincludedinthe
modulator set).
SETTING THE MODULATOR PARAMETERS AND PROGRAMMING THE OUTPUT CHANNEL
10-segment switch is used to set the following modulator parameters.
1. BG/ I – set modulator operation standard (PAL I – South Africa)
2. CH/S – set channel type “S”– special channels: S1-S41, CH – channels: ch4-ch12; ch21-ch69
3. TEST – TEST signal on/o
4. +40 – switch for programming the received channel
5. +20 – switch for programming the received channel
6. +10 – switch for programming the received channel
7. +8 – switch for programming the received channel
8. +4 – switch for programming the received channel
9. +2 – switch for programming the received channel
10. +1 – switch for programming the received channel
Fig. 1. Typical modulator connection with summing of the signal from TV antenna