Labgear MOD221 RF Modulator Owner’s Manual
- September 14, 2024
- Labgear
Table of Contents
Labgear MOD221 RF Modulator
Introduction
Easy set-up analogue modulator pre-configured f or UK TV integration. With
clear LED channel display, auto recovery, PLL controlled frequency and
adjustable RF, video and audio levels.
The MOD221 takes an additional audio/ audio video signal from a variety of analogue sources (e.g. DVD player, CCTV) and moves the signal to whatever TV channel you select to display it on. The modulator connects to the analogue source via the stereo audio and video phono connectors and to your TV via the standard RF aerial input, adding the additional signal and retaining the off- air channels from your existing RF feed (cable or aerial).
Main features
- Easy set-up – Pre-configured for UK TV integration
- Clear readout – 2 digit LED display shows selected channel number
- Highly adaptable – Can operate on cable TV networks
- Auto recovery – returns to selected channel after a power-cut
- PLL controlled frequency for rock-solid stability
- RF Output level adjustment – increase for longer cable runs
- Video and audio brightness and volume control
- Double side-band modulation for non-adjacent channels only
Signal sources
Any analogue AV signal source can be converted and distributed via the MOD221
including older CCTV equipment and other AV sources.
Compatible Displays
Please note you will need a TV with a built in analogue tuner to view the out
put of the MOD221.
Safety
- Do not connect the device to the power if the power cord is damaged
- Do not connect the unit to the mains until all cables have been connected correctly
- Do not cover the ventilation slots, the recommended clearances and other precautions given in these instructions must be observed to prevent overheating. In addition, units should not be positioned where they are likely to become covered by curtains, fabric or insulating material. The unit should not be left resting on a carpet
- This appliance is not waterproof, it is intended for indoor use only and must not be positioned where they could be exposed to dripping or splashing water. Objects containing liquids should not be placed on or near the modulator.
- To prevent fire, make sure the unit and attached cabling is kept well away from heat sources
- If the unit has been stored in cold conditions allow it to warm to room temperature before connecting to the mains
NOTE : Multi dwelling systems must be earth bonded using a minimum 4mm2 copper cable in accordance with the CAI Standard.
Making the connections
- Connect your source audio and video signals to the 3-inputs (2 audio and 1 video)
- Connect the RF OUT to your TV or your TV signal distribution system.
- If you are combining the new signal with off-air terrestrial signals connect your aerial to the ANT input
- Plug the Modulator into the power supply
Setting the TV Channel Number
- Before you start, if you are combining the modulated signal with off-air broadcasts check which channels are being used locally and try to add the new channel in a space with at least one empty channel on either side.
- In TV Mode the display will show the Channel number selected automatically. To change the output channel of your new modulated signal, press the UP or DOWN buttons until you reach the desired channel number.
Altering the Audio Subcarrier
Using the MODE selection button select AV and the display will show the
sub-carrier bandwidth (5.5 represents 5.5MHz). Use the UP or DOWN buttons to
select the desired frequency.
Note : After 3 seconds the display will revert to show the Channel number. Note: PAL-I (UK) uses 6.0MHz for audio, PAL-B/G uses 5.5MHz.
Setting a CATV Channel number
- Cable TV uses a different numbering convention so if you are combining this signal into a CATV network use the MODE selection button to select option 01.
- In CATV Mode the display will show the Channel Number. To change the output channel of your new modulated signal, press the UP or DOWN buttons until you reach the desired channel number.
Locking your selected settings
Just press the LOCK button once and all other function buttons will be
disabled (L displays for a few seconds to confirm). Pressing the Lock button
again enables the function buttons and allows changes to be made.
Adjusting levels
If required it is possible to adjust the input levels of the Audio or Video
signal or the output level of the RF signal using the 3 adjusters under the
display. Use a small slot screwdriver and take extreme care to avoid breaking
these delicate components.
Features and Controls
- Audio Input Right
- Audio Input Left
- Video Input
- RF Input (Aerial)
- LED Channel Display
- RF Output
- RF Output Level Adjustment
- Video Brightness Adjustment
- Audio Volume Adjustment
- Channel Up
- Channel Down
- Channel Lock
- Mode selection – (channel group/audio subcarrier)
Technical Specifications
| Frequency Range | 47-870MHz |
|---|---|
| Output Level | 90dBµV |
| Input Level | 0.8Vp-p for 80% ± 10% modulation |
| Input Level Addition | 0.4Vp-p ~ 0.8Vp-p |
| S/N Ratio | 55dB |
| A/V Ratio | -15 ± 2dB |
| Frequency Response | ± 2.5dB (50Hz – 4.2 MHz) |
| Visual Carrier Freq. Accuracy | ± 5KHz |
| Output Return Loss | 14dB |
| Spurious Rejection | 50dB |
| Audio Carrier Deviation | ±50KHz |
| Audio Carrier Response | ±2dB |
| Output Impedance | 75Ω |
| AC Power Input | 220-240V~50/60Hz |
| Maximum Power Consumption | 2W |
Modulator Channels Allocation Table
Waste electrical and electronic products should not be disposed of with household waste. Please recycle where facilities exist. Check with your Local Authority for recycling advice.
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