are there any better feedhorn then Invacom ADF-120 for 1.8 m prime focus

[samoloko]

Hi

I like to know your experience with Invacom ADF-120 feedhorn
are they really Improving performance
are there better feedhorns available
my dish has f/d 0,335 and I have cheap ring which I don't know how to position to get right
would anybody be so kind to explain how can be adjusted f/d using Invacom ADF-120

regards

 

[BGPv4]

As I said you need a Seavey feed, they are the only one that works with deep dishes like yours.

You need Seavey ESR-120

 

[samoloko]

thank you for reply but I can not find that feed anywhere
not only webshop but technical details
are there any feed that Is comparable with seavey

regards

 

[Low Profile]

For an f/d of 0.335 you need to set the ADF-120 to 5.5mm protrusion.

 

[Channel Hopper]

thank you for reply but I can not find that feed anywhere
not only webshop but technical details

The technical details are around. Seavey actually supplied a technical drawing with the product as well. You might be able to machine something similar using the diagram.

 

[samoloko]

thank you for reply

5,5 mm protrusion means that I have to move the rings 5,5 mm from dish focus point to LNB ?
well I could try machine but there are no values of distances
I am not 100 percent sure that ADF-120 rings are perfect Ku band machined

 

[Low Profile]

Yes, use a vernier gauge.
Or if you can find out the pitch of the thread then you could work out how many rotations of the corrugated feed.

 

[BGPv4]

thank you for reply but I can not find that feed anywhere
not only webshop but technical details
are there any feed that Is comparable with seavey

regards

You need to contact Seavey directly in USA, they ship worldwide but expect to pay $300 plus shipping for the feedhorn, i am NOT joking

 

[samoloko]

well that Is expensive
looking at diagram I can not understand why there Is a motor - It Is not for a polarotor
the other problem Is mounting

 

[BGPv4]

well that Is expensive
looking at diagram I can not understand why there Is a motor - It Is not for a polarotor
the other problem Is mounting

Because Seavey doesn't sell to end consumers, they sell to commercial systems that needs motor to control polarization, but you can remove the scalar from the motor as you can see in pic and attach a C120 LNB to it.

Mounting is easy as you can fabricate a metal plat if you have the skills.

The Invacom is not a feed suited for your dish as it misses two rings on the scalar to reject ground noise.

Too bad i didn't keep my Seavey feeds, i binned them when big dishes and sat-tv crashed in the mid 90's, i never thought anyone would have any use for them again, but i was wrong....

I found a pic

 

[Low Profile]

I think Big Nick was looking into getting some 108mm adjustable feed horns some time ago...............

http://www.satellites.co.uk/forums/...inge-reception-tech/89655-feedhorn-types.html

 

[samoloko]

hear how look mine
only 3 rings around waveguide
3 mm space between rings, 2 mm thick of ring, 11,2 mm height of the ring
It Is very different from this http://www.satellites.co.uk/forums/attachments/forum46/10228d1170264406-2-feeds-plan-jpg.att

do I need to add another 3 rings to mine or I have to change some sizes

regards