Download SKS-8 TV System

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Twin VSB stereo modulator
User Manual
RF-Tuote Oy, Telakkatie 25, 25570 Teijo, tel. +358-2736 6360, fax. +358-2-736 6360, [email protected],
1. Purpose of use
RFT-801 is designed for a modulating two video and audio signals into standard CCIR channels. RFT801 is supplied with extra video filter for unclear video source (like PC). A2 stereo, dual and
multistandard mono audio functions are available. Adjacent channels (VSB modulation) from S 2 to E69
can be used.
2. Installation
The connections and indications are shown in Fig 1.
1. Control switch to program channel 1 (left) or
channel 2 (right). The switch must be set to middle
position when programming is ready
2. Channel number ( CCIR) or TV standard.
3. Cable-TV S channel
4. The signal led shows that the unit is powered or
modulator set-up is activated
5. RF OUT + DC IN in RFT-800 frame installation
6. DC IN (only in stand-alone installation)
7. DC OUT for next RFT-801 unit
8. VIDEO/AUDIO connectors
Fig 1.
RFT-801 can be mounted either to RFT-800 frame (RFT-800 User Manual) or stand-alone.
When RFT-801 is mounted for RFT-800 frame, the power voltage is supplied through active output
combiner. When RFT-801 is mounted stand-alone, power supply unit must be mounted to the left side of
RFT-801 due to the ventilation. DC connector is connected to left side of DC connector at the bottom of
unit (6). You can loop-through DC from the right side DC connector (7) to next unit with the DC cable.
Maximum 8 RFT-801 units in chain can be supplied with one power supply (RFP-804) in stand-alone
Audio and video are connected to VIDEO/AUDIO connectors (8).
When RFT-801 is mounted for RFT-800 frame, cable to network is connected to active output
combiner. When RFT-801 is mounted stand-alone, RF OUT (5) is connected to cable network via
external RF combiner.
RF-Tuote Oy, Telakkatie 25, 25570 Teijo, tel. +358-2736 6360, fax. +358-2-736 6360, [email protected],
3. Programming
The receivers and modulators are simple to program with the remote control unit (RCU). The main
functions of RCU are shown in Fig 2.
1. OK
2. VOL <
3. VOL >
5. SYS
6. ∧∧
7. ∨∨
8. CH ∧
9. CH ∨
10. UHF
save setting
fine tune output frequency
fine tune output frequency
cancel the selection
set TV standard
set output level
set output level
change the output channel
change the output channel
to activate modulator set-up
Fig 2.
3.1 Power-up and first time set-up
On front panel display selected output channels are displayed.
To control modulator first slide front panel switch to left or right position to control modulator 1 or 2
respectively. Press UHF key on the remote. On selected output channel display a dot is lit on right lower
corner. This indicates that modulator set-up is activated. Test pattern and test sound are switched on.
To change output channel press up or down CH keys to scroll through available channels. Cable TV Schannels are indicated with a dot between digits. The selectable channels are S02 - S10, 5 - 12, S11 - S41
and 21 – 69 (CCIR).
To change TV standard press SYS key repeatedly until required standard name I, DK (d), L, MN (nn) or BG
is displayed.
You can fine tune output frequency when using different channel grid than CCIR. Adjustment is done using
left and right arrow keys in steps of 250 kHz. Adjustment range is +- 4 MHz. Frequency offset from the
CCIR channel frequency is shown on all four digits of the unit.
To adjust modulator output attenuation use double arrow keys.
Audio output for BG standard can be adjusted pressing Audio key repeatedly. “Mono (nn)” is standard
audio. “Stereo (St)” and “Dual (du)” use dual tone coding system to transmit two audio channels. For
standards other than BG only mono can be used.
NOTE! The stereo or dual audio will actually work only when front panel switch is in center position.
To save modulator settings press OK key. To cancel selection, press EXIT key. Modulator set-up will be
exited and test pattern and test sound will be switched off in both cases.
When you are done with setting up the modulator, please slide the front panel switch to center position. This
will prevent accidental changes to be made while controlling other units.
RF-Tuote Oy, Telakkatie 25, 25570 Teijo, tel. +358-2736 6360, fax. +358-2-736 6360, [email protected],
4. Technical specification
Number of modulators
Output frequency range
112,25 MHz - 855,25 MHz
AM, VSB, A2 stereo, mono
Transmission standard
B/G, D/K, I, L, M/N
Output level
85 - 105 dBuV
Spurious products
< 60 dBc
S/N weighted
55 dB
Nominal input level
1,0 Vpp
Input impedance
75 ohm
Nominal input level
0,3 Vrms
Input impedance
75 ohm
AV connectors
RCA-female 75 ohm
Output connectors
F-male 75 ohm
Power consumption
RFT-800 rack or stand alone
This symbol on the product or on its packing means that within the European Union the product must be
taken to separate collection at the product-end-of life.
Do not dispose of these products as unsorted municipal waste.
Fore more information about where you can drop off your waste equipment for recycling, please contact
your local city office, your house disposal service or the ship where you purchased the product.
RF-Tuote Oy, Telakkatie 25, 25570 Teijo, tel. +358-2736 6360, fax. +358-2-736 6360, [email protected],