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10 Common Problems Associated with Modulation
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- TV on wrong frequency. Modulator set on UB/Catv TV on UHF or vise versa.
- Variable gain turned down to low to compensate for splitter loss, cable length.
- Multiple input modulators set on the same channel example 2 input mod channel set on 65 and 65. Channel must be at least 1 channel apart.
- Using the wrong low pass filter or no low pass filter.
- Installing a low pass filter post amp instead of pre-amp. Installation note: the dBmv level should exceed 5 dBmv and should not go below 5 dBmv at any frequency.
- The difference in dB level between Catv and modulation is greater that 10 dB causing cross talk.
- Unused channels on modulator set below the frequency of low pass filter.
- Difference in ground potential between Catv ground and modulators grounded AC plug.
- Modulated channel not programmed into TV - add the channel.
- And last, but not least, FITTINGS. Bad fittings can make or break an entire system.
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The Smartest DIY Home Improvements
