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.


35 posts

Geek


Topic # 87472 29-Jul-2011 16:32
Send private message

Hi there,

After some help if possible.  I have a roof mounted FM aerial with its cable running to a ground floor distribution box.  My question is is there a way to carry the FM signal over the cat5 cables that we have running from the distribution box to the lounge, where the stereo is?   Can this be done?  


Thanks,

Nick

Create new topic
3395 posts

Uber Geek
+1 received by user: 397

Trusted

  Reply # 499507 29-Jul-2011 17:18
Send private message

It may be possible but remember that cat5 isn't shielded.





606 posts

Ultimate Geek
+1 received by user: 38


  Reply # 499524 29-Jul-2011 18:29
Send private message

I take it that running a proper antenna feeder is not an simple task here? Not ideal, unshielded and impedance is a little way off what you want for balanced FM feed - you are replacing balanced feed I guess and not trying to use balanced UTP cable in place of 75 ohm coax? But if the signal level is decent, it's probably going to work well enough for FM (being reasonably narrow band) and most likely a better than an indoor antenna.


606 posts

Ultimate Geek
+1 received by user: 38


  Reply # 499536 29-Jul-2011 19:06
Send private message

alexx:
....and most likely a better than an indoor antenna.


That should read "most likely a better option than an indoor antenna".

Plus, it should be mentioned that 300 ohm ribbon cable (balanced) is unshielded. If the existing feeder from antenna to ground floor distribution box is 75 ohm coax, then perhaps a good idea to use a balun where you connect to the cat 5 cable.

If in doubt, use pins 4-5 for the FM signal.
http://en.wikipedia.org/wiki/Category_5_cable

You could even experiment with grounding the unused pins, to see if this helps provide some shielding effect (if needed).

Edit: fixing formatting.


6190 posts

Uber Geek
+1 received by user: 250

Trusted
Subscriber

  Reply # 499548 29-Jul-2011 19:32
Send private message

Hi, yes as mentioned cat5 is fine although the losses are somewhat greater than RG6 etc but in short lenths (<25m) should be fine, the big issue is lack of shielding as mentioned.

Cyril



35 posts

Geek


  Reply # 499691 30-Jul-2011 11:54
Send private message

 I have no training on this stuff but looking over the web I came across these baluns that sound like they might do the job?  One at each end of the cat5 run.  It's not that long actually - maybe 15 meters in total.
http://www.muxlab.com/products/ve_catv_balun.html
Not sure where I would get this type of thing in NZ.  Any ideas?


Thankss,

Nick 

6190 posts

Uber Geek
+1 received by user: 250

Trusted
Subscriber

  Reply # 499721 30-Jul-2011 13:26
Send private message

Hi, yes thats what you need, PDL's Lexcom range does have similar units, however they only come as complete panels and kits, I suggest for what you need get them from the states, with the $ the way it is should be easy, just shipping kills it.

Cyril

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 »

Microsoft Dynamics 365 Business Central launches
Posted 10-Jul-2018 10:40


Spark completes first milestone in voice platform upgrade
Posted 10-Jul-2018 09:36


Microsoft ices heated developers
Posted 6-Jul-2018 20:16


PB Technologies charged for its extended warranties and warned for bait advertising
Posted 3-Jul-2018 15:45


Almost 20,000 people claim credits from Spark
Posted 29-Jun-2018 10:40


Cove sells NZ's first insurance policy via chatbot
Posted 25-Jun-2018 10:04


N4L helping TAKA Trust bridge the digital divide for Lower Hutt students
Posted 18-Jun-2018 13:08


Winners Announced for 2018 CIO Awards
Posted 18-Jun-2018 13:03


Logitech Rally sets new standard for USB-connected video conference cameras
Posted 18-Jun-2018 09:27


Russell Stanners steps down as Vodafone NZ CEO
Posted 12-Jun-2018 09:13


Intergen recognised as 2018 Microsoft Country Partner of the Year for New Zealand
Posted 12-Jun-2018 08:00


Finalists Announced For Microsoft NZ Partner Awards
Posted 6-Jun-2018 15:12


Vocus Group and Vodafone announce joint venture to accelerate fibre innovation
Posted 5-Jun-2018 10:52


Kogan.com to launch Kogan Mobile in New Zealand
Posted 4-Jun-2018 14:34


Enable doubles fibre broadband speeds for its most popular wholesale service in Christchurch
Posted 2-Jun-2018 20:07



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.