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.


chrisbaby

26 posts

Geek


#116789 9-May-2013 23:48
Send private message

As you may know after Christmas you will no longer be able to receive satellite TV from Australia because the broadcasters are moving to a new system called vast. The new vast system will have a guaranteed 17 free to air channels plus if you can get a modified card it will increase to around 40 channels the signal will be very week in fact it will only be what is known as spill.

Never the less a 5 or 6 MT dish should give you a pretty good signal all thro there will be rain fade from time to time.

To by a dish commercial one can cost as much as $20,000 but I have the skills to make one using colour steel and light weight box section

I have no idea how to work out the parabolic reflector and that is where I need help

Create new topic
grant_k
3539 posts

Uber Geek

Trusted

  #814936 10-May-2013 00:13
Send private message

I hope you are living on a block of land somewhere, well out of sight of a public road.  If so, no problem, but if you are in a city, this size of dish will run foul of city council bylaws.

Sky dishes use an "Offset Feed" as shown in this Wikipedia article:

https://en.wikipedia.org/wiki/Parabolic_antenna

This webpage could be useful for you in working out the profile needed:

http://mscir.tripod.com/parabola/





chrisbaby

26 posts

Geek


  #814942 10-May-2013 01:10
Send private message

no i live in town but have a nice hidden place so no on will see it and there is good line of site to the satellite
and i wont tell if you wont tell lol

 
 
 
 


hdinsider
551 posts

Ultimate Geek


  #814963 10-May-2013 07:30

If anyone asks just say it's a sculpture!

For Ku band reception you will need the dish to be really accurate in shape- that's why the real ones cost so much.




don't mess with me.... i'm the hd insider....

chrisbaby

26 posts

Geek


  #815968 11-May-2013 22:21
Send private message

Yes from what i have found out I may well be wasting my time

grant_k
3539 posts

Uber Geek

Trusted

  #815969 11-May-2013 22:28
Send private message

chrisbaby: Yes from what i have found out I may well be wasting my time

Could be very difficult to do it by hand I think.  With a CNC machine and and some fancy metal bending machinery it would no doubt be possible, but not really feasible for a one-off.

Now if you could do it with a 3D printer and then paint the plastic with some metallic paint, that would be interesting...





SATTV
1071 posts

Uber Geek


  #815972 11-May-2013 22:37
Send private message

Back in 1986 or so, I saw plans on how to build your own prime focus dish.
You need to calculate the radius and the parobla.
See this site.
http://www.nairaland.com/657626/diy-design-fabricate-own-satellite
Cut out a piece of ply to the 1/2 parabola
Scribe it around a large amount of sand.
Once you are happy with your sandcastle, pour resin over the mound and wait for it to set.
Viloa you are done.
You could use this as a plug to make a steel one.
20k sounds a bit high for a 6m dish, I can understans if solid being that price but you should be able to get big petals cheaper than that.

I never built one but was very keen to do so, You should use moulding sand as it is a lot finer.

Back then, satelite dishes were only C band and were illegal in NZ belive it or not.

Cheers
John




I know enough to be dangerous


nickb800
2475 posts

Uber Geek

Trusted

  #815974 11-May-2013 22:42
Send private message

hdinsider: If anyone asks just say it's a sculpture!



Sounds legit, corrugated iron passes for art in this country!

 
 
 
 


chrisbaby

26 posts

Geek


  #817127 14-May-2013 00:27
Send private message

I spoke to an expert who told me he tried making them about ten years ago using tig wielding and a custom made roller.
They could not get it good enough there was still too much signal loss

Also the moulded sand system works very well making boat hulls and such but is not good enough for my needs.
It looks like I might have to go fibre optic with a vpn and use net flicks
or some other provider.

Create new topic





News »

Nanoleaf enhances lighting line with launch of Triangles and Mini Triangles
Posted 17-Oct-2020 20:18


Synology unveils DS16211+
Posted 17-Oct-2020 20:12


Ingram Micro introduces FootfallCam to New Zealand channel
Posted 17-Oct-2020 20:06


Dropbox adopts Virtual First working policy
Posted 17-Oct-2020 19:47


OPPO announces Reno4 Series 5G line-up in NZ
Posted 16-Oct-2020 08:52


Microsoft Highway to a Hundred expands to Asia Pacific
Posted 14-Oct-2020 09:34


Spark turns on 5G in Auckland
Posted 14-Oct-2020 09:29


AMD Launches AMD Ryzen 5000 Series Desktop Processors
Posted 9-Oct-2020 10:13


Teletrac Navman launches integrated multi-camera solution for transport and logistics industry
Posted 8-Oct-2020 10:57


Farmside hits 10,000 RBI customers
Posted 7-Oct-2020 15:32


NordVPN starts deploying colocated servers
Posted 7-Oct-2020 09:00


Google introduces Nest Wifi routers in New Zealand
Posted 7-Oct-2020 05:00


Orcon to bundle Google Nest Wifi router with new accounts
Posted 7-Oct-2020 05:00


Epay and Centrapay partner to create digital gift cards
Posted 2-Oct-2020 17:34


Inseego launches 5G MiFi M2000 mobile hotspot
Posted 2-Oct-2020 14:53









Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.


Support Geekzone »

Our community of supporters help make Geekzone possible. Click the button below to join them.

Support Geezone on PressPatron



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.