OTHER Unknown Dish

[Hoops ❁]

Well, some of those Prodelin design do look a lot of prime focus dishes (nudge, nudge, do-you-remeber, eh?)

But it is definitely a 1251 offset dish. And I believe it's a 0.6 f/D one.
At least the reflector seemingly used to be part of a 1251 antenna.
(But the removal of the Prodeiln name and typenumber from the model designator make you wonder if it's actually a re-mould?)

The mount is not original (and note that it seems broken in th left-hand side).

That is not to say it won't do the job - if properly made, a re-enabling of a reflector will work fine. You just need to focus the LNB.

Follow instructions as above, then make feee-holding arms.
OR
If you want the "official way", make arms according to attached PDF.
Use the measurements of the 240cm 0.6 f/D Ku band specs.
Make arms that put the LNB in that position.

Thanks

 

[Hoops ❁]

Thanks everyone for taking time out to explain things to me, i found the attached image online yesterday, i would use it as a guide along with previous suggestions from you guys. Thanks again.

 

[st1]

Thanks everyone for taking time out to explain things to me, i found the attached image online yesterday, i would use it as a guide along with previous suggestions from you guys. Thanks again.

Ok.

But do note that the information in the file you found on the web is only half the story.
It correctly states the distance (58.52") to the focal point, but it does not tell you *where* it is. (You are missing the second co-ordinate.)

The measurements in the table of in the attachement I posted lists the (correct) distance from the top and bottom of the dish to the front of the feed-horn. This is also not necessarily the focal length of the dish (see a33's post above).

You need to use the measurements (A,B,C,D) to ensure that the feedhorn is indeed aligned with the focal point. And no, you don't need a Prodelin feehdhorn. Your feedhorn/LNB-holder just need to have the front plane aligned with the plane indicated by (A-B, C-D), and then have the possibility to move the LNBF back and forth along the central axis of the LNBF.

RimaNTSS is a specialist in making LNBF holders that allows for good adjustment - I'm sure he can fill in more details on how to do this simply and effectively.

 

[RimaNTSS]

specialist in making LNBF holders

Common st1 , do not make me shine. I just try to stick to the rule: "if you can not make it perfect, do it adjustable".

 

[st1]

Common st1 , do not make me shine. I just try to stick to the rule: "if you can not make it perfect, do it adjustable".

But you are - no-one does it like you do.
Not even the Chinese...

 

[stecle]

Working on getting the 2.4m Prodelin installed before winter. The polar mount is taking a lot of time and work. Will post some pictures when complete.

The plastic cover on the feed-horn is torn and I would like to repair it. Anyone know where I can purchase a replacement?

Thanks

 

[clucas]

My first C-Band only feedhorn (so many years ago) had styrofoam glued just inside the throat. I was thinking of trying this on a cracked Ku cover but haven’t yet.

 

[stecle]

My first C-Band only feedhorn (so many years ago) had styrofoam glued just inside the throat. I was thinking of trying this on a cracked Ku cover but haven’t yet.

That is a good suggestion. My Cal-Amp feed has Styrofoam in the throat too. I will give that a try until I can find the OEM replacement.

Thanks for the reply.