Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.




6231 posts

Uber Geek
+1 received by user: 2934

Subscriber

Topic # 225798 6-Dec-2017 09:52
Send private message quote this post

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. 

 

 





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


Create new topic
390 posts

Ultimate Geek
+1 received by user: 252


  Reply # 1913748 6-Dec-2017 10:11
One person supports this post
Send private message quote this post

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.




6231 posts

Uber Geek
+1 received by user: 2934

Subscriber

  Reply # 1913762 6-Dec-2017 10:29
Send private message quote this post

Thank you very much for that. It is exactly what I wanted to know.

 

 





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


Create new topic



Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Spark doubles down on wireless broadband
Posted 24-Jan-2018 15:44


New Zealand's IT industry in 2018 and beyond
Posted 22-Jan-2018 12:50


Introducing your new workplace headache: Gen Z
Posted 22-Jan-2018 12:45


Jucy set to introduce electric campervan fleet
Posted 22-Jan-2018 12:41


Hawaiki cable system will be ready for service in June 2018
Posted 22-Jan-2018 12:32


New Zealand hits peak broadband data
Posted 18-Jan-2018 12:21


Amazon Echo devices coming to New Zealand early February 2018
Posted 18-Jan-2018 10:53


$3.74 million for new electric vehicles in New Zealand
Posted 17-Jan-2018 11:27


Nova 2i: Value, not excitement from Huawei
Posted 17-Jan-2018 09:02


Less news in Facebook News Feed revamp
Posted 15-Jan-2018 13:15


Australian Government contract awarded to Datacom Connect
Posted 11-Jan-2018 08:37


Why New Zealand needs a chief technology officer
Posted 6-Jan-2018 13:59


Amazon release Silk Browser and Firefox for Fire TV
Posted 21-Dec-2017 13:42


New Chief Technology Officer role created
Posted 19-Dec-2017 22:18


All I want for Christmas is a new EV
Posted 19-Dec-2017 19:54



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.