Advice Needed Best single LNB on a motorized 1m20 Channel Master ?

zorrin

zorrin

Specialised contributor
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france
Hi everyone,
I need your feedback about LNB for my motorized 1m20 CM.
i allready have an original C120 Channel Master feedhorn + INVERTO IDLP-SINF02-OOPRO-OPP
i think about an INVERTO IDLB-SINL40-ULTRA-OPP or a classic one like the INVERTO IDLP-SNL410-PREMU-OPN

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zorrin said:
Hi everyone,
I need your feedback about LNB for my motorized 1m20 CM.
i allready have an original C120 Channel Master feedhorn + INVERTO IDLP-SINF02-OOPRO-OPP
i think about an INVERTO IDLB-SINL40-ULTRA-OPP or a classic one like the INVERTO IDLP-SNL410-PREMU-OPN

​

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The Ultra would be my choice ... I don,t think gains would be that much over what you already have .. they are not expensive though to buy and compare .. i found the Ultra had a slight edge on some (but not all) transponders.
 
The Black Ultra Twin IDLB-TWNL40-ULTRA-OPP has been the best LNB on my 1.2M CM. My Black Ultra Singles give a tiny bit more signal but for some reason are very picky about how tightly the F-connector is screwed on.

Both Ultras comfortably beat the INVERTO IDLP-SNL410-PREMU-OPN on a 1.2M CM - the neck isn't long enough.

I've only used the CM feed horn with SMW singles and have never had good results compared to the Black Ultra LNBs.
 
I'm not focused on Inverto, it's just that it seems to me that it's a "real" brand and not too expensive.
 
With Channel Master dishes the long 'neck' of the Black Ultras helps a lot, there aren't many other LNBs with that feature. I do wish they'd make an IBU with a 4G filter - if 4G is a problem for you a Black Ultra may not be the best choice.
 
ozumo said:
the long 'neck' of the Black Ultras helps a lot
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Yes, it helps move LNB closer/further to the dish, but does not eliminate the basic issue - original feedarms and LNB-holder do not place LNB in the proper position, so the LNB's phase center will never be co-located with the antenna's focal point.
 
RimaNTSS said:
original feedarms and LNB-holder do not place LNB in the proper position, so the LNB's phase center will never be co-located with the antenna's focal point.
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I have one of your LNB holders but I'm using it with a C-band LNB. I'll make a cardboard template from your dimensions and try it with a Ku LNB :)

54.9E 11265V 30000 will be my test transponder as here it is right on the edge of lock with 1.2M + original arms/holder & IBU single.
 
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The best way to adjust the position of the LNB, IMHO, is to measure the leaning of the dish face by using digital protractor.
 
RimaNTSS said:
Yes, it helps move LNB closer/further to the dish, but does not eliminate the basic issue - original feedarms and LNB-holder do not place LNB in the proper position, so the LNB's phase center will never be co-located with the antenna's focal point.
Click to expand...
is there a way to fudge it?
 
I have 130 cm offset dish with inverto lnb. how i can increase signal for some frequencies which arenot stable?is there any way while i cannot buy big dish..does newest inverto lnb work fine for fringe reception?
 
@italy2006 I am sorry, but you do not have 130 cm dish, most likely it is only 120 cm one :(. Secondly, it will give you very little, or even no gain if you use other LNB. If you can not get bigger dish you can try better adjusting existing LNB, making sure LNB is pointed to the proper point on the surface of the dish and LNB's phase center is co-located with the antenna's focal point.
 
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italy2006 said:
I have 130 cm offset dish with inverto lnb. how i can increase signal for some frequencies which arenot stable?is there any way while i cannot buy big dish..does newest inverto lnb work fine for fringe reception?
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A tuned narrow band feed and dedicated polarity system may assist, but really you need to put a larger dish up, or move house.
 
italy2006 said:
it is 130 cm.
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How did you measure it?
italy2006 said:
wgich type of feedhorn help to incerase signal for offset dish and ku satellite?
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It is hard to say as you did not show any pictures of your antenna. But, if you wish to go "the feedhorn and flange LNB" way then you better make sure that the illumination angle of the feedhorn is matching the opening angle of the antenna.
 
ozumo said:
I have one of your LNB holders but I'm using it with a C-band LNB. I'll make a cardboard template from your dimensions and try it with a Ku LNB :)

54.9E 11265V 30000 will be my test transponder as here it is right on the edge of lock with 1.2M + original arms/holder & IBU single.
Click to expand...
What you mean by you have one of is lnb holder ?
it look like i missed something about @RimaNTSS
 
Channel Hopper said:
A tuned narrow band feed and dedicated polarity system may assist, but really you need to put a larger dish up, or move house.
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Do you have an example of this feed ?
I mean at an acceptable price.
More than just a good LNB, for me push my CM dish to it best this is what we want in fact.
 
zorrin said:
What you mean by you have one of is lnb holder ?
it look like i missed something about @RimaNTSS
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In the thread below post #25 shows the holder & post #26 has an image of the calculated correct dimensions for location of the LNB:

Pimp up Channel Master

Plate which is installed now has 120mm between horizontal holes. Of course, it is possible to make wider plate but then system will become less stable. And, anyway, multifeed-rail should be somehow connected to the plate.
www.satellites.co.uk www.satellites.co.uk
 
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RimaNTSS said:
How did you measure it?

It is hard to say as you did not show any pictures of your antenna. But, if you wish to go "the feedhorn and flange LNB" way then you better make sure that the illumination angle of the feedhorn is maIMG_20210601_122016.webptching the opening angle of the antenna.
Click to expand...
 
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