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An 8VSB SFN Distributed Translator System
Presented during the NAB 2010 Broadcast Engineering Conference on Apr 12, 2010, this paper discusses implementation of an 8VSB SFN DTV Translator System.
DTV Translator Implementation
Presented during the National Translator Association Convention on May 5, 2007, this paper discusses implementation of DTV Translators in the USA. Grant information from US Department of Commence (NTIA) is also provided.
Off-Air Reception of 8-VSB Signal for Digital CATV
This paper describes details about 8VSB reception, channel characteristics, and receiver performance requirements. Understanding of multi-path channel and understanding of 8VSB reception is a key for a successful deployment of HDTV service by CATV Head-Ends.
Digital On-Channel Booster for 8VSB
This paper reviews DTV translator technologies, discusses concerns and issues faced by today’s DTV broadcasters, and proposes a new 8-VSB Digital On-Channel translator concept.
A Revenue Opportunity for Digital Translators
TV Translators are the best way to provide the free over-the-air television services to rural households located in areas with geographic barriers. However, the current transition to Digital TV (DTV) may take a long time due to higher cost of ownership for both DTV Translator operators and the rural viewers. This paper proposes a possible business model for DTV Translator operators.
Frequently asked questions about the DVM-150E
The power meter measures a relative power and indicates in number of bars. 0 bar means that there is no signal. 6 bars mean that there is high power signal present at the RF input port.
It is recommended to set the RF power level between 3 bars and 5 bars. If too much power is present, then add 10 or 20 dB attenuator. If too small power is present, then add an LNA amplifier to increase power level.
The BER measures bit error rate. 1E-6 means 1 bit error that has occurred over 1 million bits. 1E-8 means 1 bit error that has occurred over 100 million bits.
The SNR measures Signal-to-Noise Ratio in dB after digital matched filtering operation inside the demodulator. For 8VSB, we consider any number greater than 20 dB is a good set up.
If SNR is less than 20 dB, then the unit is seeing too much noise, co-channel interference, or adjacent channel interference. If the noise is the issue, then add an LNA amplifier to increase power level. If co-channel interference is the issue, adjust antenna pointing to find a working case.
Check the power level, SNR, BER using the front panel menu keys.
There is SNR/BER select menu. This option will show Power Level, SNR or BER on the front panel.
• Make sure that not too much power is being inserted at the RF input port.
• If too hot, reduce the RF signal by 10 dB, or until you have a good signal input (-65dBm recommended)
• The Power level is good. But SNR is Bad. This means you may have Co-Channel Interference.
• Power level is good. SNR is good. BER is good. This should be normal mode of operation. Picture should not break at this time. But, if picture still breaks, then you have too much channel multi-path.
• Adjust antenna orientation.
• Power level is bad, SNR is bad, BER is bad. Increase power level by adjusting antenna or use an LNA to increase power
The DVM-150E is equipped with a contact relay to indicate that the 8VSB digital off-air signal or any of its input signals has gone bad. However, this option is not shipped with the unit since everyone does not need this option. Contact factory to receive the RELAY option.