INVACOM 0.3db LNB in Gran Canaria

[Corrigapp]

You must have done something wrong...There is absolutely nothing wrong with C120 flange fitting to C120 type LNB's...ALL the screws SHOULD align without a problem if you fit it correctly...
Can you post a jpg of your feed+LNB setup please?

One last point....is your feed manufactured by Channel Master or a feed "suitable for CM dish"??

iceman

Two of the holes *don't* match up, I have exactly the same problem and yes my feed is made by CM.

Corrigap

 

[iceman]

Two of the holes *don't* match up, I have exactly the same problem and yes my feed is made by CM.

looks like i willl have to climb on to the roof to take some JPG's of my setup to prove you guys wrong!!

iceman

 

[iceman]

@corrigap & @BLUEPLATINUM
Attached is a jpg of my setup taken few mins ago (although only three screws are visible on the photo) i can assure you all four screws are in place.. ;)

Can you please post a jpg of your setup so that we can see what is different on yours?

iceman

 

[puffin]

Are there slightly different versions of feed?
I also have a CM feed with 8 holes. 4 screws fits without any problems. The rest is very hard to fit though. 4 screws should be quite enough to secure a waterproof LNB.

Cheers
Huffin the Puffin

 

[BLUEPLATINUM]

According to the supplier of the feedhorn (which is second hand and doesn't have any packaging) it IS a genuine CM one.

Having looked at the photo above, I have obviously made a major c*ck up anyway. The black collar which comes in two parts I have positioned around the long thin bit of the feedhorn - obviously wrong assuming the photo above is correct. I am going back up on the roof to fiddle with it again.

Thnaks guys ......

 

[Corrigapp]

@corrigap & @BLUEPLATINUM
Attached is a jpg of my setup taken few mins ago (although only three screws are visible on the photo) i can assure you all four screws are in place.. ;)

Can you please post a jpg of your setup so that we can see what is different on yours?

iceman

Here is a jpeg of my LNB/feedhorn. As you can see the screws at 12, 3, 6 and 9 o'clock all fit ok, but the other 4 screws (I mistakenly wrote 2 in my previous post) don't match. It was the same with the LNB that I had before, an MTI. I didn't try to force them as they were quite clearly not going to go in without a fight, so I put silicon in the remaining holes to waterproof them and left it at that. It seems to be a solid fit even though I'm only using half the screws.


Corrigap

 

[Likvid]

Huge feed mismatch in the picture, you must be losing quite much signal.

That's why you need a C120 adapter between the LNB and CM feedhorn.

You would need this one http://www.smw.se/products/adapterc120.pdf

They have two different models, i really don't know the difference as the other one says it's for Prodelin dishes.

That will take care of the mismatch you are having and the C120 holes will line up perfectly.

Here is a jpeg of my LNB/feedhorn. As you can see the screws at 12, 3, 6 and 9 o'clock all fit ok, but the other 4 screws (I mistakenly wrote 2 in my previous post) don't match. It was the same with the LNB that I had before, an MTI. I didn't try to force them as they were quite clearly not going to go in without a fight, so I put silicon in the remaining holes to waterproof them and left it at that. It seems to be a solid fit even though I'm only using half the screws.


Corrigap

 

[Corrigapp]

Huge feed mismatch in the picture, you must be losing quite much signal.

That's why you need a C120 adapter between the LNB and CM feedhorn.

You would need this one http://www.smw.se/products/adapterc120.pdf

They have two different models, i really don't know the difference as the other one says it's for Prodelin dishes.

That will take care of the mismatch you are having and the C120 holes will line up perfectly.

Hi Likvid,

I can understand the bit about the holes lining up but the rest doesn't make any sense to my amateur brain.

Looking at iceman's rig, it doesn't look as if he has anything between his LNB and the CM feedhorn, or am I mistaken?

Are you sure I need this? Sorry to be a 'doubting Thomas'!

Corrigap

 

[iceman]

Looking at iceman's rig, it doesn't look as if he has anything between his LNB and the CM feedhorn, or am I mistaken?

You are correct,there is no spacer between my LNB & CM feed..I do not belive you need one either.
By the looks of it your feed is not exactly same as mine...the only difference seems to be lack of screw holes necessary for attaching the LNB.
I have an easy solution for you if you have drill..u just need to drill a few holes on the feed.
The shiny aluminium flange on the LNB comes off if you twist it.
Take it off & place it on the feed to mark out the exact locations of the holes...or even better,clamp them together and use the holes on the flange as a guide for your drill bit...
Just make sure you align the flange on the center of the feed before you clamp & start drilling. ;)

iceman

 

[Likvid]

If the C120 hole on the feed is not perfectly lined up with C120 hole on the LNB you will get a mismatch.

According to your picture the LNB seems to be pushed over the feedplate edge on one side and inside on the other side.

Only thing you could do is to remove the weather cap in front of the feedhorn and look straigt into and see if both C120 holes are lined up.

Hi Likvid,

I can understand the bit about the holes lining up but the rest doesn't make any sense to my amateur brain.

Looking at iceman's rig, it doesn't look as if he has anything between his LNB and the CM feedhorn, or am I mistaken?

Are you sure I need this? Sorry to be a 'doubting Thomas'!

Corrigap

 

[iceman]

According to your picture the LNB seems to be pushed over the feedplate edge on one side and inside on the other side..

I agree with you Likvid...looking at the picture,one can see the feed & LNB holes are not aligned..I belive my simple solution will sort his problem without the need for an adapter.What is your oppinion?

iceman

 

[Likvid]

Yes as long as the C120 holes are in line with each other i won't see any problems.

I agree with you Likvid...looking at the picture,one can see the feed & LNB holes are not aligned..I belive my simple solution will sort his problem without the need for an adapter.What is your oppinion?

iceman

 

[Corrigapp]

@ likvid @ iceman

Thanks for your input guys.

Having checked over my LNB/feed very carefully, I can tell you that the waveguide apertures in the LNB and feed are lined up exactly. I entered this thread regarding the position of 4 of the screw holes not matching in the interface between the LNB and feed. It would seem there must be more than one type of CM feedhorn. On my rig, the screws at 12, 3, 6 and 9 o'clock match up with no problem. But that leaves the other holes at approximately 2, 4, 8 and 10 o'clock out of true. What you can see in my previous picture is probably an 'optical illusion' of some sort.

I also enclose a picture of the CM polar rotator which came along with the feedhorn. It shows how the screw holes are arranged so that they will match up with the feedhorn perfectly. If you look closely, you will see that the holes that should have been at 2 and 10 o'clock are slightly closer to the 12 o'clock hole and the ones that should have been at 4 and 8 o'clock are slightly closer to the 6 o'clock hole. I say 'should' in the sense in order to match the holes on the Invacom and MTI LNBs perfectly.

Corrigap

 

[iceman]

@corrigap
Attached is the drawing of the SMW C120-C120 adapter and its measurments.
If you check you will see that the C120 holes match the ones on your Invacom.
The jpg Likvid has posted is the adapter suitable for Prodelin feed...
See them both here >> _http://www.smw.se/products/feed2.htm

By the looks of the last jpg you posted,your rig seems to be as it should.
From the angle you took the pic i can see three three screws in place...what exactly is your problem.?

iceman

 

[Corrigapp]

@corrigap
Attached is the drawing of the SMW C120-C120 adapter and its measurments.
If you check you will see that the C120 holes match the ones on your Invacom.
The jpg Likvid has posted is the adapter suitable for Prodelin feed...
See them both here >> _http://www.smw.se/products/feed2.htm

By the looks of the last jpg you posted,your rig seems to be as it should.
From the angle you took the pic i can see three three screws in place...what exactly is your problem.?

iceman

@iceman

I joined this thread to say that Blueplatimum wasn't the only person unable to align *all* the screw holes correctly, Puffin also said more or less the same thing. That's all.

Corrigap

 

[trigger]

Blueplatinum
My name is Dez and am based in Lanzarote and have recently been installing 3.1M dishes here with no signal problems on 2D. I would be interested in talking to you but I cannot send you an email.