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.




380 posts

Ultimate Geek
+1 received by user: 28


Topic # 145447 18-May-2014 12:03
Send private message

Hi

Looking at DVB-T from Mt Erin to Wairoa in Hawkes Bay.

What would be the feasibility and reliability be like?

Path is mostly over the sea.
Estimated distance 90km.
Mt Erin height 490m.
Receiver antenna height possibly 5m.
QSL line of sight calc shows approx 100km.

Going Digital report in 2011 says:
Viewers in Wairoa and Mahia whose aerials point south or southwest towards Mt Erin will be included in the Hawke’s Bay region.

Various Yagi gains look to be about 10 to 16dB.
Not sure if a good S/N would be available.

Anyone have experience with DVB-T over such large distances?

Thanks

Cheers

Gordon





Gordy

Create new topic
5759 posts

Uber Geek
+1 received by user: 818

Trusted
Subscriber

  Reply # 1047405 18-May-2014 12:11
Send private message

Whakatane is ~120 km from the nearest transmitter (Te Aroha) and most people have no problems with Freeview so long as they have a decent aerial (my parents have a 91 element and it works fine). Mt Erin apparently has a similar power output so as long as there is line of sight, I can't imagine that there would be any issues.

16944 posts

Uber Geek
+1 received by user: 2006

Trusted

  Reply # 1047420 18-May-2014 12:57
Send private message

Might depend on the weather or at least be affected by really bad weather

 
 
 
 


917 posts

Ultimate Geek
+1 received by user: 38


  Reply # 1047429 18-May-2014 13:30
Send private message

Kopukairua next to Tauranga is much closer than Te Aroha but lower powered.

If a 91 element aerial isn't enough there is always something like this
http://www.dtvs.co.nz/index.php?main_page=product_info&cPath=3&products_id=85

880 posts

Ultimate Geek
+1 received by user: 117


  Reply # 1048495 20-May-2014 03:59
Send private message

Most 91 elements out there are Wideband antennas, with the restacking of services recently what is preferable for weak signals is one optimized specifically for high gain in the Band 4

We use to get analogue VHF TV via Wharite over sea path into the Marlbourugh sounds. The signal fluctuated up and down and was pretty much unusable over 140K sea path. It would go from good to nothing within 10 minutes.

a 90k path on UHF might be ok but you might get dropouts!

Try it and see.




 


5759 posts

Uber Geek
+1 received by user: 818

Trusted
Subscriber

  Reply # 1048524 20-May-2014 07:49
Send private message

bfginger: Kopukairua next to Tauranga is much closer than Te Aroha but lower powered.

It doesn't appear to work at all from Whakatane. Even with the aerial vertical and pointed at Kopukairua, I still got a stronger signal from Te Aroha (horizontal). I suspect that there is a hill in the way of Kopukairua.

I misspoke when I said "closest" transmitter; I meant the only usable one :)

2373 posts

Uber Geek
+1 received by user: 406


  Reply # 1048533 20-May-2014 08:22
Send private message

Before Timaru got its own local freeview transmission I got it working at my parents house via Sugarloaf in Christchurch. 
Thats 160km.
It disappeared in bad weather and wasnt reliable.

Back in the early days of TV2 starting up (the mid 70s) many people in Timaru used to get quite a quite reliable feed from Christchurch.

The VHF analogue signal is a bit more forgiving and digital is either perfect or dead.

I would think 90km unobstructed should be ok - guess you just have to try it.




Nothing is impossible for the man who doesn't have to do it himself - A. H. Weiler

Onward
10918 posts

Uber Geek
+1 received by user: 4767

Trusted
Subscriber

  Reply # 1048535 20-May-2014 08:28
Send private message

At 90km over water it is going to be unpredictable and flaky.




Mike
Retired IT Manager. 
The views stated in my posts are my personal views and not that of any other organisation.

 

 It's our only home, lets clean it up then...

 

Take My Advice, Pull Down Your Pants And Slide On The Ice!

 

 




380 posts

Ultimate Geek
+1 received by user: 28


  Reply # 1048601 20-May-2014 10:08
Send private message

Thanks for the help so far.

I have seen a few aerials pointing in the direction I am thinking of.
When I get settled in Wairoa I might drop in to one or two of these places and ask what their DTT is like.

This enquiry was started because I am staying at my step son's place.
The satellite video on a 50 inch TV was terrible.
I discovered that he was using an old Sat receiver with composite video output.

Picked up a new el cheapo DishTV Sat receiver with HDMI output from Harvey Norman.
Even though the receiver HDMI is 576i output the picture quality is a vast improvement.

Cheers








Gordy

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 »

FUJIFILM introduces X-E3 mirrorless camera with wireless connectivity
Posted 18-Sep-2017 13:53


Vodafone announces new plans with bigger data bundles
Posted 15-Sep-2017 10:51


Skinny launches phone with support for te reo Maori
Posted 14-Sep-2017 08:39


If Vodafone dropping mail worries you, you’re doing online wrong
Posted 11-Sep-2017 13:54


Vodafone New Zealand deploy live 400 gigabit system
Posted 11-Sep-2017 11:07


OPPO camera phones now available at PB Tech
Posted 11-Sep-2017 09:56


Norton Wi-Fi Privacy — Easy, flawed VPN
Posted 11-Sep-2017 09:48


Lenovo reveals new ThinkPad A Series
Posted 8-Sep-2017 14:37


Huawei passes Apple for the first time to capture the second spot globally
Posted 8-Sep-2017 10:45


Vodafone initiative enhances te reo Maori pronunciation on Google Maps
Posted 8-Sep-2017 10:40


Voyager Internet expand local internet phone services company with Conversant acquisition
Posted 6-Sep-2017 18:27


NOW Expands in to Tauranga
Posted 5-Sep-2017 18:16


Windows 10 Fall Creators Update coming Oct. 17
Posted 4-Sep-2017 14:10


Garmin introduce Garmin vivoactive 3
Posted 1-Sep-2017 18:38


Kiwibank wastes $90 million on software – Reseller News
Posted 1-Sep-2017 13:45



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.