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.




204 posts

Master Geek
+1 received by user: 5


Topic # 113137 7-Jan-2013 19:21
Send private message

Any fellow GZers able to help with antenna issues?

Have a V/U antenna in the roofspace (not on roof)
This is cabled up to a central "splitter / amplifier" and then distributed through to 3 points.
There is only 1 TV connected.

Crystal HD reception with annoying rabbit ears, yet no / very poor reception with the antenna.

Any suggestions please?
Don't want to spend a fortune fixing, but it sucks having no TV!!




I would love to change the world, but they won't give me the source code

#BOFH

Create new topic
Talk DIrtY to me
4247 posts

Uber Geek
+1 received by user: 2271

Trusted
Subscriber

  Reply # 741242 7-Jan-2013 19:27
Send private message

Do you get a poor reception on all 3 of the TV sockets? Try them all and see.




Whatifthespacekeyhadneverbeeninvented?


147 posts

Master Geek
+1 received by user: 2


  Reply # 741262 7-Jan-2013 19:53
Send private message

The amplifier box needs power. Are you supplying power to it ?

 
 
 
 


Try Wrike: fast, easy, and efficient project collaboration software


204 posts

Master Geek
+1 received by user: 5


  Reply # 741264 7-Jan-2013 19:56
Send private message

DarthKermit: Do you get a poor reception on all 3 of the TV sockets? Try them all and see.


TV3 digital I assume you're asking.

With the rabbit ears = no issues TV3 (DTV)

With the roofspace antenna, no reception on TV3, just TV1 and TV2.






I would love to change the world, but they won't give me the source code

#BOFH

850 posts

Ultimate Geek
+1 received by user: 125

Trusted

  Reply # 741291 7-Jan-2013 21:01
Send private message

quandum:

TV3 digital I assume you're asking.

With the rabbit ears = no issues TV3 (DTV)

With the roofspace antenna, no reception on TV3, just TV1 and TV2.




Freeview terrestrial is delivered only via UHF in multiplexs, so you should get blocks of channels. If you can go from the UHF aerial direct to one tv and that works, then it points to your splitter / amplifier unit. I think the previous poster talking about power might be a very good place to start



204 posts

Master Geek
+1 received by user: 5


  Reply # 741567 8-Jan-2013 12:49
Send private message

kiwisat: The amplifier box needs power. Are you supplying power to it ?


Yes it is plugged in, and there is a red LED lit up on the box, so I'm assuming that its working.

(Not being pedantic, but the LED might be on, but box busted...etc)




I would love to change the world, but they won't give me the source code

#BOFH

1911 posts

Uber Geek
+1 received by user: 122


  Reply # 741582 8-Jan-2013 13:15
Send private message

quandum:

Yes it is plugged in, and there is a red LED lit up on the box, so I'm assuming that its working.

(Not being pedantic, but the LED might be on, but box busted...etc)


OK. As you say, doesn't mean the power is getting to the amp.
If you get a perfect signal with rabbit's ears then you probably don't need the amplifier.
Try plugging the TV into each of the 3 outlets in turn and see if any of them produce a suitablesignal. Be aware unused outlets should in theory be terminated with a 50 ohm terminating plug.
If that fails then bypass the splitter/amp and run direct from antenna to the outlet where the TV is plugged in.
If that fails dump the antenna (lots of Freeview device don't like any VHF input) and install a new UHF only antenna with new co-ax (around $40 at Tricky Dicky) direct to the TV.
Then consider putting in a new splitter if you really need to use the other outlets.
You may also consider an amplified indoor panel antenna which looks much nicer than rabbit's ears and could even be located in the roof space.
Also -
How is the antenna mounted in the roofspace?
Is it pointing the right way?
What is the condition of the co-ax (old, corroded etc)?
Are all the connections OK?
What type of splitter/amp is it?
How is the power supply connected to it?
All this info might help us advise provide a positive solution.
Can you provide photos or a diagram?

1926 posts

Uber Geek
+1 received by user: 296

Lifetime subscriber

  Reply # 741604 8-Jan-2013 13:33
Send private message

75 ohm terminator.




Ross

 

Spark FibreMAX using Mikrotik CCR1009-8G-1S-1S+

 


Speed Test


1911 posts

Uber Geek
+1 received by user: 122


  Reply # 741698 8-Jan-2013 15:24
Send private message

Spyware: 75 ohm terminator.


Oops. Yes, 75 ohm.
I was thinking in Ham Radio mode, not TV mode.



204 posts

Master Geek
+1 received by user: 5


  Reply # 742009 9-Jan-2013 00:25
Send private message

B1GGLZ: OK. As you say, doesn't mean the power is getting to the amp.
If you get a perfect signal with rabbit's ears then you probably don't need the amplifier.
Try plugging the TV into each of the 3 outlets in turn and see if any of them produce a suitablesignal. Be aware unused outlets should in theory be terminated with a 50 ohm terminating plug.
If that fails then bypass the splitter/amp and run direct from antenna to the outlet where the TV is plugged in.
If that fails dump the antenna (lots of Freeview device don't like any VHF input) and install a new UHF only antenna with new co-ax (around $40 at Tricky Dicky) direct to the TV.
Then consider putting in a new splitter if you really need to use the other outlets.
You may also consider an amplified indoor panel antenna which looks much nicer than rabbit's ears and could even be located in the roof space.
Also -
How is the antenna mounted in the roofspace?
Is it pointing the right way?
What is the condition of the co-ax (old, corroded etc)?
Are all the connections OK?
What type of splitter/amp is it?
How is the power supply connected to it?
All this info might help us advise provide a positive solution.
Can you provide photos or a diagram?


Wow, firstly, thanks for the comprehensive response.

Edit : 75 ohm, not 50ohm terminator - currently not present - will see if I can get this sorted.
I'm thinking the bypass is going to be easier to try first. If that works, doubt I'll need to the other sockets (only have the 1 telly).

Afaik, the antenna in the roofspace is just "lying" there (not sure who/how/why anyone would do that instead of a clean mount...anyway..)
Coax is about 10+years old at best guesstimate.

I'll try and head into the roofspace and grab photos.
The amp is easier to take pics of thankfully as it sits in a cupboard.
Power is supplied via a standard power socket / plug. Switch off = power off.

Are all the connections ok - I'm a bit of a n00b with TV stuff, so I'm assuming connections are ok - they are plugged in to the amp, but no idea if shorting etc etc.

Do you think I could use a multimeter to test any of the connections - what reading expected if so?




I would love to change the world, but they won't give me the source code

#BOFH

1911 posts

Uber Geek
+1 received by user: 122


  Reply # 742049 9-Jan-2013 08:32
Send private message

quandum:

Wow, firstly, thanks for the comprehensive response.

Edit : 75 ohm, not 50ohm terminator - currently not present - will see if I can get this sorted.
I'm thinking the bypass is going to be easier to try first. If that works, doubt I'll need to the other sockets (only have the 1 telly).

Afaik, the antenna in the roofspace is just "lying" there (not sure who/how/why anyone would do that instead of a clean mount...anyway..)
Coax is about 10+years old at best guesstimate.

Do you think I could use a multimeter to test any of the connections - what reading expected if so?


Suggest try the bypass first which is the easiest and cheapest option.
However, given the age of the antenna and co-ax I'd suggest best option is to head off to Dick Smith and grab their UHF antenna pack fo $50. It includes everything needed for installing. Preferably install on the outside of the house but could also be installed in the roof space. Run the single co-ax direct to the TV. That should solve the problem. No need then for terminators which are not essential but might help. Dump the old antenna and amp. Multimeter could be used but you need to know what you are doing.
An antenna just "lying there" is not the best sort of install. It should be mounted clear of any structure. Any nearby metal (nails, reinforcing. bracing, etc) can affect reception.

1911 posts

Uber Geek
+1 received by user: 122


  Reply # 742051 9-Jan-2013 08:36
Send private message

One of these is also an option.
http://www.freeviewshop.co.nz/digital-terrestrial/terrestrial-aerials-c-11/flat-panel-aerials.html
Make sure you can return it for refund if it doesnt work though.
Nothing beats and external UHF antenna installation.



204 posts

Master Geek
+1 received by user: 5


  Reply # 750442 24-Jan-2013 21:55
Send private message

B1GGLZ:
quandum:

Wow, firstly, thanks for the comprehensive response.

Edit : 75 ohm, not 50ohm terminator - currently not present - will see if I can get this sorted.
I'm thinking the bypass is going to be easier to try first. If that works, doubt I'll need to the other sockets (only have the 1 telly).

Afaik, the antenna in the roofspace is just "lying" there (not sure who/how/why anyone would do that instead of a clean mount...anyway..)
Coax is about 10+years old at best guesstimate.

Do you think I could use a multimeter to test any of the connections - what reading expected if so?


Suggest try the bypass first which is the easiest and cheapest option.
However, given the age of the antenna and co-ax I'd suggest best option is to head off to Dick Smith and grab their UHF antenna pack fo $50. It includes everything needed for installing. Preferably install on the outside of the house but could also be installed in the roof space. Run the single co-ax direct to the TV. That should solve the problem. No need then for terminators which are not essential but might help. Dump the old antenna and amp. Multimeter could be used but you need to know what you are doing.
An antenna just "lying there" is not the best sort of install. It should be mounted clear of any structure. Any nearby metal (nails, reinforcing. bracing, etc) can affect reception.



Apologies for the late reply!
And thank you for your help guys....

Crystal picture from socket 2. and with terminators.

Still don't quite understand how the terminators work....but I am assuming its like a COAX terminator used on the old COAX cable ethernets..




I would love to change the world, but they won't give me the source code

#BOFH

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 »

IBM leads Call for Code to use cloud, data, AI, blockchain for natural disaster relief
Posted 25-May-2018 14:12


New FUJIFILM X-T100 aims to do better job than smartphones
Posted 24-May-2018 20:17


Stuff takes 100% ownership of Stuff Fibre
Posted 24-May-2018 19:41


Exhibition to showcase digital artwork from across the globe
Posted 23-May-2018 16:44


Auckland tops list of most vulnerable cities in a zombie apocalypse
Posted 23-May-2018 12:52


ASB first bank in New Zealand to step out with Garmin Pay
Posted 23-May-2018 00:10


Umbrellar becomes Microsoft Cloud Solution Provider
Posted 22-May-2018 15:43


Three New Zealand projects shortlisted in IDC Asia Pacific Smart Cities Awards
Posted 22-May-2018 15:14


UpStarters - the New Zealand tech and innovation story
Posted 21-May-2018 09:55


Lightbox updates platform with new streaming options
Posted 17-May-2018 13:09


Norton Core router launches with high-performance, IoT security in New Zealand
Posted 16-May-2018 02:00


D-Link ANZ launches new 4G LTE Dual SIM M2M VPN Router
Posted 15-May-2018 19:30


New Panasonic LUMIX FT7 ideal for outdoor: waterproof, dustproof
Posted 15-May-2018 19:17


Ryanair Goes All-In on AWS
Posted 15-May-2018 19:14


Te Papa and EQC Minecraft Mod shakes up earthquake education
Posted 15-May-2018 19:12



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.