Can multiple LNB's work with Channel master internet dish

burrenyoga

Hi,
I am a newbie, looking to buy Satellite dish equipment to pickup HD TV as it rolls out.

I have a 1 metre Channel Master dish which used to be used for internet connection.

I was told that i could use this to point at 1 satellite with 1 LNB.

But that it would not be good to use with 3 LNB's.

Something about it only being an uni-directional dish.

Can somebody give me some clarification of this, or is my supplier just trying to sell me another dish?

I am hoping to pickup Astra 2 (28E), Astra 1 (19E) & Hotbird (13E).

In case it matters, i am interested in getting setup for HD Transmissions as they roll out, and i will be using a HD receiver Technomate 6900 and from research on the internet new Titanium second edition 0.2dB LNBs.

Can this Channel Master dish be used with 3 LNB's ?

Thanks in advance,
Dave

pedro2000uk

Yes 3,4,5 LNBs ... - you need the right bracket or make or modify one.

Those are a very good 1m dish.. has it got a C120 & matched feed horn installed at the moment but in a 40mm holder with sleeves to take it up to 40mm? If it has the feed horn might get in the way/ the C120 might be the wrong frequency/band and you could get 3 LNBfs instead.

burrenyoga

Thanks for that Pedro.

I have no idea what a C120 or matched feedhorn is. It was used to receive and upload via Satellite to the internet.

It has quite a big rectangular unit with Giliat Transmitter written on it, with a circular front end pointing at the dish... in the place i would expect an LNB to be.

I guess i would need to remove this unit, and buy 3 new lnb's to go in it's place.

And source a bracket to hold the 3 LNB's.

Does anyone have advice where to source one of these brackets or which LNB's to use?

Thanks,
Dave

Jagcat

This may be of help to you

_http://www.intellectsystems.co.uk/epages/intellectsystems_co_uk.sf/en_GB/?ObjectPath=/Shops/intellectsystems.co.uk/Categories/Dishes/%22Channel%20Master%22

on that page is a bracket for such a thing-as requard the C120 just try a search on the net for C120 LNB and all will be revealed

pedro2000uk

need a picture of that to advise a bracket..

burrenyoga

Hi Jagcat,
Thanks for the url for the brackets.

Any advantage of getting the more expensive brackets of the two listed? I can't make out from photos, but it looks like the £70 is adjustable where the £15 is fixed.

I found a great article (probably old-hat news to you guys) on how to align 3 LNB's to Astra 2 (28E) Astra 1 (19E) & Hotbird (13E) at
_http://www.satcure.co.uk/tech/page9.htm with tips on bending the bracket to improve reception.

Does anyone know a specific model of C120 LNB that would work best with the 1.0 m Chanel Master ?

I read somewhere that one should use a feedhorn specifically made for a particular dish. Is that true?

Or do i have a feedhorm alreay that i can use? See photos.

I will attach a photo of the dish and current internet feedhorn-transmitter.

Thanks Guys again for you help. It's making this 'research into what is best' a lot less daunting being able to post questions here.

Dave

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burrenyoga

I contacted again the local Satellite guy who i was hoping would setup the Channel Master dish with 3 LNB's and he says that

"it is a prime focus dish and not suitable for 3 LNB's "

Can anyone else give me some definite feedback on this please.

Is there anyone out there picking up 13, 19 and 28 degrees east satellites on a 1.0 m Andrews Channel Master dish?

Please see photo of dish in above reply.

Dave

pedro2000uk

Obviously that feedhorn neck and rx/tx wave guides to the lnb & TXer are a bit different to modify to a 40mm LNBf neck and (3) multi lnbs, but it actually is an offset dish- prime focus is bang in the middle- that's low down = offset, just 100mm higher but the LNBs wont cast a shadow and the same basic rules apply.

The next thing is to modify it successfuly as a working and 100% efficient Channel Master 1m offset then add the 2 other LNBs... might need a bit of moding but you will/ can get far harder sats* than just 28e 19e 13e with that you know - I could get them on that dish with 3 absoluetely useless LNBf's and a bit of duck tape with pro signals on all three.

It's how you do it...

I'd remove the wave guides (square tubes going to the LNB & TX) and remove the LNB & TX- check the C120 you have got (the one nearest you when you took the photos- not the TX!!) It may be C120 - KU Universal (what was the sat/ service it was on?) and bolt that straight on if that is a C120 flange (looks like it is), line up on [EDITED...] 28e and just add 2 LNBfs at the 'right side (facing dish)' for 19e & 13e.. with a modified bracket.- getting past that feed horn might be a problem so I've said put 28.2/5e in the middle and 19.2e 13e on one side because the gap is bigger between 28.2/5e and 19.2e. If the C120 is not full KU then there has been some cheaper MTI C120 KY Uni's about that are adequate for that job.

Also the LNB holder might be 40mm with spacers onto that feed horn's wave guide (tube) so you might be able to remove that and the spacers and just put an LNB on straight away- then you can use 19.2e as the middle.

Have to get on with work but close ups of the neck of that feed horn and flange are useful..



EDIT.. *just seen you location... and 13e 19e 28e are still OK on that dish but your location can limit some weaker sats and C120 on 28e not 19e.

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CROSSBONES

im thinking of doing the same, but i am after a c120 adaptor for my feed

Channel master Vsat feed

Here`s a site selling the multi lnb arm.

-http://www.global-cm.net/multifeedsys.html

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burrenyoga

Hi Pedro,
I think the satellite guy is just trying to sell me his Triax dish with 3 LNB’s, and does not want to come here to simply instal my own dish.

My feeling at present is that i am going to try to do the modifications as you suggest, and try to set it up myself.

The Internet service and dish was provided by Digiweb Website _www digiweb ie

I checked the small rectangular box (nearest me in photo) and it says Low Noise Block, NF 1.0 db

I don’t see any label of C120 ?

Can i just remove the wave guides, feedhorn, and the Tx and the LNB, and use 3 universal LNBs such as Titanium single lnb .2db (Second Edition).

Would this be the easiest way to setup the dish?

I have ordered a magic multi lnb holder from the US. Same principle as Crossbones multi lnb, but looks different. I guess that i will have to somehow attach this to the central support arm coming from the dish, and then possibly attach the side arms to add strength and rigidity to the LNB setup.

And position the central LNB to be located somewhere near where the front of the feedhorn was ?

Am i getting this right?

Pedro, I did not follow.... do you want a closer up photo of the top of the wave guides?

Dave

rolfw

Well I would guess that what he really means is "You are probably not going to want to pay me enough to warrant the time I'm going to have to spend doctoring the non-standard fittings to get decent reception on all of the required satellites."

I have to confess that I wouldn't touch an installation like this with a bargepole, unless perhaps it was for a mate and I had the spare time to experiment.

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pedro2000uk

An average installer doesn't want bespoke stuff too much anyway because he's got to make a living and use what he knows he can just put up and it will work OK...
BTW.. I'd be tempted to try to find out what it's worth if it is all working that is..

I checked the small rectangular box (nearest me in photo) and it says Low Noise Block, NF 1.0 db
if it doesn't say the ku frequency/ range look for the voltage range 15v-24v = not a ku uni.. sorry I don't know what it is from that except no good for this I think .. except it should have a C120 flange that you can just put a C120 lnb on.

Can i just remove the wave guides, feedhorn, and the Tx and the LNB, and use 3 universal LNBs such as Titanium single lnb .2db (Second Edition). Would this be the easiest way to setup the dish?

It would be the easiest - depends if it has a 40mm neck, if the feed horn is in a 40mm neck and they've used spaces down to the feed horn. (Close up photo would help there) then just remove it and replace it all with a 40mm LNBf ... C120 + feedhorn & spacers to a 40mm LNB holder 290808a.jpg

I have ordered a magic multi lnb holder from the US. Same principle as Crossbones multi lnb, but looks different. I guess that i will have to somehow attach this to the central support arm coming from the dish, and then possibly attach the side arms to add strength and rigidity to the LNB setup. That LNB arm is very strong already.

And position the central LNB to be located somewhere near where the front of the feedhorn was ?

not the front of the feedhorn... on that... the LNBf's face on say a titanium can be 50mm back from where the feed horn face is now and if that is already on a 40mm LNB holder it will do it for you subject to a fine adjustment.

Pedro, I did not follow.... do you want a closer up photo of the top of the wave guides?

A close up on the feed horn where it's bolted/ screwed on to the end of the lnb arm(that is- is it already in a 40mm neck or not) and a close up photo where it is bolted/ screwed to the wave guide/s just to verify that's its a standard c120 flange (or one photo with both on)

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Jagcat

I suggest you try the extra LNB if the angle between the two satellites isn't to large - remember to point the dish at the weakest signal (for the original LNB) and extra LNB's at the stronger signals as they will not recieve the best signal strenth.

If it fails then at least you have the LNB ready for your 2nd dish!

burrenyoga

Thinking about even connecting the cable to the LNB's etc., i don't feel confident about trying to setup all these connections myself, so i may just opt for the installer to setup the Triax dish with 3 lnbs, and he says he will put 1 lnb on the Channel Master for Thor.

And after he goes, i may try to setup the multi lnb holder and 3 lnbs on the Channel Master myself.

The LNB unit says
Supply Voltage +15 to 24v DC
Model NJR2754H

Photos attached.

Guess that second dish might be setup sooner than i thought.

Thanks for the advice again.

Dave

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pedro2000uk

As I suspected the lnb's single voltage (15v-24v) says it's not a ku universal and not really any use here .. and the lnb neck (feed clamp) isn't 40mm as you can see from your close ups so you couldn't just bung a 40mm lnbf on it without modifying it, but it will allow you to put a very good C120 lnb on it by undoing the 4 small screws on the 1st (round) flange and removing all the tx/rx gear in one go and fitting an c120 (ku universal) as per my photo which is what he's going to do.
The channel master 1m with that feed horn and a C120 lnb should better than even a triax 1.1m for weak difficult satellites, if you go ahead with the triax with 3 lnbs he'll use a 4 way diseqc switch leaving one spare.... ... for the channel master.

Tip.... try to get the channel master on 26e!

I have to say - we routinely re-engineer satellite gear without a thought and that dish would have been modified to do the job (and tweaked to its peak) without a thought. The one thing I'm repeatedly guilty of is forgetting that, not everyone does that…. I think I’ll put a warning in mi signature.

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burrenyoga

Thanks Pedro.
I may ask him to put a 6 way diseqc and maybe supply 2 extra lnbs. And later i may try to setup 3 lnbs using an adjustable multi lnb holder.

Why do you suggest 26e ?

Any others which is should consider? Maybe you can suggest another part of the Forum which may make suggestions on this.

Btw, i am looking into using a patch on the technomate which seems to open up a world of other choices.

Best Wishes,
Dave

pedro2000uk

26e carries a lot of English fta including movie channels etc.. 28e 19e 13e & 26e is quite a nice setup.

For other satellites and the channels on them have a look at lyngsat.com (between about 45e to 45w) (or flysat.com or kingofsats.net) and most of the ones you can easily get in the UK listed on the strongest signals/ transponders lists elsewhere on this forum or check their footprints on the above sites that they actually come into or near the UK ... although you can only get so far apart on a dish.

diseqc switches come in 2s, 4s, 8s.. they do lose you a bit of signal though..

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