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.




3135 posts

Uber Geek
+1 received by user: 1166


Topic # 144134 8-May-2014 12:57
Send private message

I am using this entry level UHF antenna.

http://www.dicksmith.co.nz/antennas/dick-smith-hd-uhf-outdoor-antenna-pack-dsnz-l4735

DSE told me it would be OK for our location (The Wood, Nelson).  But If the weather is poor - rain or even a lot of cloud on Mt Campbell where the transmitter is, the picture breaks up.  This is worse on Choice, Prime, Maori etc.

Our house is about 40km horizontal distance from the Freeview UHF transmitter, with about 1,200m altitude difference. 

The current antenna has clear line of sight and it pointing right at the transmitter tower (Mt Campbell) which I can see on good day.  The rotation of the antenna is correct.  I have quality RG6 cable and good F-Type crimped, sealed connections.

Advice appreciated.  Specifically should I try a different antenna and what sort?






Mike

Filter this topic showing only the reply marked as answer View this topic in a long page with up to 500 replies per page Create new topic
 1 | 2 | 3
Fully Operational
3343 posts

Uber Geek
+1 received by user: 1088

Trusted
Vocus
Subscriber

  Reply # 1038983 8-May-2014 13:15
Send private message

You may need a masthead amplifier, from a bit of research there aren't many antennae out there with more gain than the one you've got (assuming the figure is accurate of course).

579 posts

Ultimate Geek
+1 received by user: 27

Trusted

  Reply # 1039037 8-May-2014 14:20
Send private message

Better to try & see if you can find a better location on your roof first.
If you have someone that can help , bring up the diagnostics on the set , ie S & Q , first of all move the aerial up/down the mast,
if not enough improvement " take it for a walk on the roof " Perpendicular to the Tx is where you would normally find the greatest variation.
You would probably need to make up an extension cable.


 
 
 
 


718 posts

Ultimate Geek
+1 received by user: 96

Subscriber

  Reply # 1039070 8-May-2014 14:23
Send private message

I'd say get a bloke in.

You could spend money fiddling about, and still have the picture break up. Then you'd be back to square one, still not knowing whether you have the alignment absolutely right etc.

The bloke will be more money up front, but at least you know it isn't wasted money, and you know the picture is as good as it possibly can be.




HTPC: Antec NSK2480B case, AMD A4-5300 CPU, Asus F2A85-M LE mobo, WD Caviar Green 64Mb 2TB HDD, HD Homerun, Win7 Home Premium, RAM 1600Mhz 4Gb.
iPad air 2


718 posts

Ultimate Geek
+1 received by user: 96

Subscriber

  Reply # 1039072 8-May-2014 14:23
Send private message

I'd say get a bloke in.

You could spend money fiddling about, and still have the picture break up. Then you'd be back to square one, still not knowing whether you have the alignment absolutely right etc.

The bloke will be more money up front, but at least you know it isn't wasted money, and you know the picture is as good as it possibly can be.




HTPC: Antec NSK2480B case, AMD A4-5300 CPU, Asus F2A85-M LE mobo, WD Caviar Green 64Mb 2TB HDD, HD Homerun, Win7 Home Premium, RAM 1600Mhz 4Gb.
iPad air 2


718 posts

Ultimate Geek
+1 received by user: 96

Subscriber

  Reply # 1039086 8-May-2014 14:25
Send private message

If it's worth saying once, it's worth saying twice!

Or three times @Brunzy




HTPC: Antec NSK2480B case, AMD A4-5300 CPU, Asus F2A85-M LE mobo, WD Caviar Green 64Mb 2TB HDD, HD Homerun, Win7 Home Premium, RAM 1600Mhz 4Gb.
iPad air 2


2226 posts

Uber Geek
+1 received by user: 222


  Reply # 1039133 8-May-2014 14:51
Send private message

ubergeeknz: You may need a masthead amplifier, from a bit of research there aren't many antennae out there with more gain than the one you've got (assuming the figure is accurate of course).


The DSE aerial "Antenna gain: up to 14dB" yet it is recommended for "broadcasts in prime areas". DSE don't seem very confident. I have a similar looking aerial of unknown brand that has no problems getting Wharite Peak near Palmerston North from 60km away

A Freeview Shop 91 element aerial for fringe areas is rated 14-16dB.

1867 posts

Uber Geek
+1 received by user: 113


  Reply # 1039181 8-May-2014 15:34
Send private message

Judging from the Freeview coverage maps you should get a solid signal from Mt Campbell or Kaka Hill.
I would seriously inspect your antenna system for bad joints or water ingress before going for a new antenna.
You say the antenna rotation is correct. I presume you mean polarity is vertical?

3691 posts

Uber Geek
+1 received by user: 1769

Subscriber

  Reply # 1039183 8-May-2014 15:35
Send private message

The DSE aerial is entry-level and is recommended for "broadcasts in prime areas".
I don't think that the OP is in a "prime area".
Get a man in before wasting any more money.




Sideface


933 posts

Ultimate Geek
+1 received by user: 121


  Reply # 1040464 9-May-2014 02:51
One person supports this post
Send private message

Why are you using MT Campbell? surely KAKA Hill is much much closer and would have a better signal?

Can you confirm in your tuner settings, which frequencys you are actually getting.  CH numbers.

It could be that you have actually tuned into the KAKA Hill transmitter off the back or side of your antenna.

Are you also getting Mainland tv on Channel 26 or 27?




 




3135 posts

Uber Geek
+1 received by user: 1166


  Reply # 1040711 9-May-2014 10:49
Send private message

Kaka hill is closer but our house is up against the range of hills Kaka is part of and it is round a bluff in that range so we are obscured from it.  If you look at the coverage maps you will see a few little dead spots close to the hills where there is no coverage from Kaka Hill.  We are in one of those pockets - right below "The Wood" on the freeview coverage map.

No Mainland Channels.  According to mainland they broadcast from Observatory Hill,  which is in a different direction, to Mt Campbell (edit: Observatory Hill is also horizontal polarity, where as my antenna is set to vertical for Mt Campbell).


I'll check the frequencies tonight.




Mike

1867 posts

Uber Geek
+1 received by user: 113


  Reply # 1040729 9-May-2014 11:17
Send private message

Have you removed any old VHF or other antennae that may be close to your UHF?



3135 posts

Uber Geek
+1 received by user: 1166


  Reply # 1040764 9-May-2014 12:30
Send private message

B1GGLZ: Have you removed any old VHF or other antennae that may be close to your UHF?


Yes I removed it when I installed the UHF antenna.  Cut the old cable back to very near roof level.  No other antennae on our roof and we are above all our neighbours.

The antenna is on the ridge line.  I'm 6'1" and it's at chest height when I stand next to it.  As per earlier post clear line of sight to transmitter verified with a high magnification rifle scope and clear day last week.

I whipped home at lunch time and check the TV info.

I am picking up UHF channels 31, 37 & 39 .

The TV (Sony Bravia) shows the signal as 'strong' and displays a green 100% signal bar for TVNZ and TV3 channels.  For Choice, Prime et al it is 'good', yellow and a 75% signal bar.  So the signal getting to the TV is actually pretty good.

I've been doing some reading and it seems quite a few people have intermittent trouble with Mt Campbell signal breaking up.  It's possible that this is just how it is and it may be the relay of the signal to Mt Campbell that is the problem.




Mike

1867 posts

Uber Geek
+1 received by user: 113


  Reply # 1040797 9-May-2014 13:05
Send private message

MikeAqua:

I am picking up UHF channels 31, 37 & 39 .

The TV (Sony Bravia) shows the signal as 'strong' and displays a green 100% signal bar for TVNZ and TV3 channels.  For Choice, Prime et al it is 'good', yellow and a 75% signal bar.  So the signal getting to the TV is actually pretty good.

I've been doing some reading and it seems quite a few people have intermittent trouble with Mt Campbell signal breaking up.  It's possible that this is just how it is and it may be the relay of the signal to Mt Campbell that is the problem.

OK
According to this chart you should be getting 33, 35, 37.
http://www.rsm.govt.nz/cms/tools-and-services/publications/broadcasting/digital-television-channel-usage
I'd try manual tuning these channels.
Ch31 is Igloo which your TV shouldn't receive as it's DVB-T2. It's tuner is not DVB-T2 capable. My Sony doesn't find Igloo.
If all else fails I'd suggest try another antenna.
Some good info here
http://www.freeviewshop.co.nz/information/technical/aerial-guide-i-49.html

6502 posts

Uber Geek
+1 received by user: 517

Trusted

  Reply # 1040808 9-May-2014 13:13
One person supports this post
Send private message

MikeAqua:

The rotation of the antenna is correct.  I have quality RG6 cable and good F-Type crimped, sealed connections.


Who did the crimping, and what type did they use?

It only takes a small mistake to make a huge difference to the signal degradation.

Does the cable run anywhere else in the building, to a splitter perhaps or to multiple room outlets etc?

Ideally you want to strip it right back to a single run from the aerial to the TV and then start re introducing side branches etc from there.



3135 posts

Uber Geek
+1 received by user: 1166


  Reply # 1040934 9-May-2014 16:57
Send private message

Oops, I was looking at the wrong piece of paper in my earlier post. 

The programme sorting function on my TV shows the following channels and services:

33: TV3, FOUR, C4, Al Jazzera, The Shopping Channel, Te Reo,
41: ONE, 2, ONE+1, 2+1
47: Maori, Prime, Trackside, Choice TV, Sommet Sports, TVSN Shopping, First Light 

Manual Tuning doesn't find anything at all 35 or 37.  My manual tuning function is limited.  I can't force it to a particular channel.  All I can do is enter a start channel and a search direction.




Mike

 1 | 2 | 3
Filter this topic showing only the reply marked as answer View this topic in a long page with up to 500 replies per page 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 »

Netatmo launches smart home products in New Zealand
Posted 20-Nov-2017 20:06


Huawei Mate 10: Punchy, long battery life, artificial intelligence
Posted 20-Nov-2017 16:30


Propel launch Disney Star Wars Laser Battle Drones
Posted 19-Nov-2017 21:26


UFB killer app: Speed
Posted 17-Nov-2017 17:01


The case for RSS — MacSparky
Posted 13-Nov-2017 14:35


WordPress and Indieweb: Take control of your online presence — 6:30 GridAKL Nov 30
Posted 11-Nov-2017 13:43


Chorus reveals technology upgrade for schools, students
Posted 10-Nov-2017 10:28


Vodafone says Internet of Things (IoT) crucial for digital transformation
Posted 10-Nov-2017 10:06


Police and Facebook launch AMBER Alerts system in NZ
Posted 9-Nov-2017 10:49


Amazon debuts Fire TV Stick Basic Edition in over 100 new countries
Posted 8-Nov-2017 05:34


Vodafone VoIP transition to start this month
Posted 7-Nov-2017 12:33


Spark enhances IoT network capability
Posted 7-Nov-2017 11:33


Vocus NZ sale and broadband competition
Posted 6-Nov-2017 14:36


Hawaiki reaches key milestone in landmark deep-sea fibre project
Posted 4-Nov-2017 13:53


Countdown launches new proximity online shopping app
Posted 4-Nov-2017 13:50



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.