Distance between LNBs

[Pride Of Cucamonga]

Hi, I currently have a 120hx110w dish at 28.2 and considering adding this multi lnb holder to also get 19.2.

http://www.ebay.es/itm/Inverto-Mult...lite_LNBs&hash=item27cf538ae7&_uhb=1#shpCntId

I would keep 28.2 as the main focus, but does anyone good at maths know how far away the 19.2 lnb will need to be and whether i am buying the right multi lnb holder?

many thanks

 

[Analoguesat]

I use those here and they are great - easy to adjust and pretty firm as long as you do the bolts up tight

The only thing to watch is some lnbs dont have a long enough neck to allow those to attach once the lnb holder on the dish is on.

 

[timo_w2s]

I have the exact same LNB holder on a 90cm dish and it does about 12-14 degrees so it might just fit on a 1.1m, or it might not... either way it'll be close.

 

[Pride Of Cucamonga]

Cheers. I'll be using an Inverto permium and ultra (both dual feed). Is this model wide enough for 9 degrees?

 

[timo_w2s]

The LNBs will be at the opposite ends of the bar so any type of LNB would fit as long as there is enough neck to strap the holder to. The only question is if the bar is long enough for a 1.1m dish (the bigger the dish the further away the LNBs will need to be).

 

[Pride Of Cucamonga]

The LNBs will be at the opposite ends of the bar so any type of LNB would fit as long as there is enough neck to strap the holder to. The only question is if the bar is long enough for a 1.1m dish (the bigger the dish the further away the LNBs will need to be).

Anyone know how to calculate?

 

[Analoguesat]

For 7 quid just take the punt. It'll come in useful elsewhere at some point if it doesnt fit

 

[timo_w2s]

For 7 quid just take the punt. It'll come in useful elsewhere at some point if it doesnt fit

True, I have a couple of spares in the cupboard, just in case I need them...

 

[Fisty McB]

For 7 quid just take the punt. It'll come in useful elsewhere at some point if it doesnt fit

Or get a second, identical one and using two of the large securing nuts & bolts of one of the holders to join both brackets together to extend its range.

I remember seeing a video on YouTube from an Irish satellite dealer using such a bracket on either an 80cm or 90cm dish to get 28 East & 9 East for Saorsat and Freesat/UK FTA channels using two lnbs (Ka for Saorsat) so I'd say if that bracket can cover nearly 20 degrees on that size of dish, I don't think 9 degrees on a 1.1m dish should be a problem. But that's just an educated guess from myself.

Edit: YT video in question with 80cm dish...

 

[timo_w2s]

Or get a second, identical one and using two of the large securing nuts & bolts of one of the holders to join both brackets together to extend its range.

A good idea. These bars are fairly flexible too so you can carefully shape them to the right angle so the LNB looks at the centre of the dish.

 

[Pride Of Cucamonga]

Or get a second, identical one and using two of the large securing nuts & bolts of one of the holders to join both brackets together to extend its range.

I remember seeing a video on YouTube from an Irish satellite dealer using such a bracket on either an 80cm or 90cm dish to get 28 East & 9 East for Saorsat and Freesat/UK FTA channels using two lnbs (Ka for Saorsat) so I'd say if that bracket can cover nearly 20 degrees on that size of dish, I don't think 9 degrees on a 1.1m dish should be a problem. But that's just an educated guess from myself.

Edit: YT video in question with 80cm dish...

Cheers for this - that's a lot of degrees of separation!

 

[ched999uk]

Can't remember where I found it but:
Let L= dish focal length - if you don't know then use centre of dish to lnb
Let a = azimuth angular difference between offset sat and focal one.
Let d = spacing of LNB (from centres)

Equation:-

d= L x tan(a)

 

[Piltdownpaul]

Heres something i cooked up a year ago..........

http://www.flickr.com/photos/8269539@N04/8568673093/in/photostream

Notice these are narrow invertos, not standard size black ultras.

Bit older this one....

http://www.flickr.com/photos/8269539@N04/8688689307/in/photostream

 

[satelliteman]

Impressve stuff there.

 

[ched999uk]

Piltdownpaul: thanks very much for those images. I am only using zinwell quad and octo lnbs with 60mm caps but your images do convince me that I should be able to get 19.2 and 13 using my lnbs on a zone 2.

Thanks.