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.




2 posts

Wannabe Geek


Topic # 53866 14-Dec-2009 23:06
Send private message

Hi to all - I am a new immigrant to New Zealand and trying to put a TV Sat / Freeview combination together. I have bought a DS200 receiver and am now looking to find what the pros & Cons are for the dish sets. Namely: Should I buy a single 11.300GHz LO Frequency LNB or an aluminum Ku Band LNB 1075MHz? Or anything better? I know nothing about the matching and need advice. I will be using the system in my caravan for touring NZ and will eventually want to add it to my house when I settle down afterwards.
Thanks to anyone who can steer me in the right direction.
Ivor




Create new topic
147 posts

Master Geek
+1 received by user: 2


  Reply # 282877 15-Dec-2009 19:39
Send private message

You might be interested in this auction, http://www.trademe.co.nz/Browse/Listing.aspx?id=259642165 which may suit your needs. I am the vendor in this instance so I am obviously biased but i have had positive response from all who have purchased.

1677 posts

Uber Geek
+1 received by user: 7

Trusted

  Reply # 282884 15-Dec-2009 19:51
Send private message

if you have a choice between a 10750 and an 11300 LNB, take the 10750, it's got better frequency range.

 
 
 
 




2 posts

Wannabe Geek


  Reply # 282900 15-Dec-2009 20:34
Send private message

Thank you for your advice. I hear that a 60cm dish is optimum for weather / rain fade?

147 posts

Master Geek
+1 received by user: 2


  Reply # 282950 15-Dec-2009 22:14
Send private message

I can guarantee that a 45 cm dish is more than enough for the NZ beam from Optus D1. If you take a look at this footprint map, http://www.lyngsat-maps.com/maps/optusd1_nzb.html , we should all be wearing hats, but as is indicated in the side bar, a good 45 cm dish is all that is required.

One obvious benefit is the wider beam width of the smaller dish, allowing faster acquisition of the satellite, very important for travellers.

Fine tuning to a weaker channel such as SBS guarantees no rain fade on all the NZ services.

Sometimes bigger is not necessarily better.

6501 posts

Uber Geek
+1 received by user: 517

Trusted

  Reply # 283034 16-Dec-2009 09:39
Send private message

kiwisat: Fine tuning to a weaker channel such as SBS guarantees no rain fade on all the NZ services.


Could you elaborate on this please?
I would have initially thought a bigger dish would catch more of the incoming signal, so would be more tolerant of a less than perfect aligment?

147 posts

Master Geek
+1 received by user: 2


  Reply # 283085 16-Dec-2009 12:37
Send private message

Basically the SBS signal is carried on a NZ and Australia beam of the satellite and is polarized Vertical.
Reception of this signal requires the LNB skew to be fine tuned and this in turn ensures the dish is targeting the satellite perfectly hence the NZ beam will also be perfectly aligned. Many Sky installs have not had their skew adjusted for the vertical beam hence rain fade on the larger Sky dishes.

Hope this helps.

6501 posts

Uber Geek
+1 received by user: 517

Trusted

  Reply # 283089 16-Dec-2009 12:52
Send private message

Sorry, crap I highlighted the wrong line.  I get the use of SBS to fine tune, it's a bloody good idea given the signals are weaker than the main freeview broadcasts off D1.

No, was meaning the other bit, could you clarify this please:

One obvious benefit is the wider beam width of the smaller dish, allowing faster acquisition of the satellite, very important for travellers.

1677 posts

Uber Geek
+1 received by user: 7

Trusted

  Reply # 283092 16-Dec-2009 13:13
Send private message

buy as big a dish as is practical. smaller dishes are prone to rain fade, and also have trouble picking up the weaker channels. SBS is significantly weaker than Freeview, with it dropping out for me when it's really cloudy or bucketing down.

147 posts

Master Geek
+1 received by user: 2


  Reply # 283210 16-Dec-2009 20:01
Send private message

"One obvious benefit is the wider beam width of the smaller dish, allowing faster acquisition of the satellite, very important for travellers".

Essentially, the bigger the dish, the narrower the beam width. The higher the frequency and the larger the antenna, the more narrow the beamwidth, so therefore a 2 metre reflector will have one half the beamwidth of a 1 metre reflector. Without wishing to confuse the issue here, it also follows that a Ku band antenna will have one third the beamwidth of a C band antenna, because the Ku band frequencies are 3 times higher.

A minimum 2 degree separation between satellites is maintained to avoid interference from one satellite to another. As it stands now, there is very little adjustment required to move from Optus D1 to Optus C1, which are 4 degrees apart.

I only lose SBS when is is bucketing down, but still hold Freeview.


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 »

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


Nokia 3310 to be available through Spark New Zealand
Posted 4-Nov-2017 13:31


Nest launches in New Zealand
Posted 4-Nov-2017 12:31


Active wholesale as Chorus tackles wireless challenge
Posted 3-Nov-2017 10:55



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.