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6861 posts

Uber Geek
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Topic # 225798 6-Dec-2017 09:52
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I am experimenting with a masthead amp to improve UHF reception. I have a Sony TV with built-in UHF digital tuner and an old Chinese digital UHF box that I am using for tests. For some reason the antenna power on the Chinese box does not seem to work. The TV also doesn't have it. So I have made my own power injector using a piece of coax and a 9 volt battery. This seems to be working on the Chinese box.


Before I attempt a permanent solution on the TV, I need to know if putting 5-12 volts across the antenna cable can damage anything in the TV, or if I need to add a protective diode, and if I do, will that affect the RF signal? Answers to these questions would be much appreciated. 



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500 posts

Ultimate Geek
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  Reply # 1913748 6-Dec-2017 10:11
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Technically speaking you should really use a capacitor to block the DC but let the AC radio signal pass. A diode will block the DC ok, but can clip the AC and scramble the AC signal.


Google it for details.

6861 posts

Uber Geek
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  Reply # 1913762 6-Dec-2017 10:29
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Thank you very much for that. It is exactly what I wanted to know.



I reject your reality and substitute my own. - Adam Savage

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