Feedhorn/Waveguide/Scalar Ring

Quote from esuo2

Warto wiedzieć, że odbierasz afrykański promień z Europy torrex12 qwer  satesco

Mam tu też inverto single, chcę wiedzieć, czy modyfikujesz swoje lnbs

I set the lnb specifically for Badr and Nilesat 201

Quote from esuo2

It is interesting to know you are receiving an African beam from Europe torrex12 qwer  satesco

I have inverto single here, too, I want to know if you do modify your lnbs

The only modification I made to the Inverto Black Ultra lnb was to fit a ring scalar, which I found at AliExpress years ago. The results were beyond my expectations, so even today, I use it in the Ku band even though I have many lnbs.

Here are some examples/comparisons:

Also using Inverto Black Ultra in my 3m. Offset feedhorn is removed with angle grinded.

It's usually best to use original feedforn.

Quote from satesco

The only modification I made to the Inverto Black Ultra lnb was to fit a ring scalar

...I did the same (scalar ring).

Quote from esuo2

Please can I see the back as well? Thanks!

Back side is just IBU without feedforn. Dish is here, maybe visible

Thread

3m/2.4m Finland

Software developer and satellitetv hobbyist from Finland.
My current setup:
3m 42E-8W, mainly used for Astra 2E/F/G UK
2.4m 57E-47.5W, also C-band possible. Plus other smaller..
Receivers:
Octagon SF4008, Uno4K, Zero4K, FreesatV7, Amiko minihd combo and Revez HDS615 for blindscan.
Pics and location bellow

ocean

July 3, 2018 at 5:18 PM

Hi, all!

I talked todays, my best mentor and friend DXBozóth.

DXBozóth say to me, that the satesco owned scalar ring, plastic design, with the metal boiled construction. DXBozoth have also this device, but to gave it loan to maybe the feci01. I tomorrow calling feci01, and questing the this devices parameters.

Best, regards,

SaTom

Now called in the phone me feci01, and sended me for pictures also, this device.

Now, saying to me feci01:

That the scalar ring, and the ring behind distance, same the Invacom ADF-120 feedhorn.

The waveguide distance other, 34mm.

The feedhorn inside excentric point diamaeter 18,5 mm outside the full scalar 69,9 mm. (Sames Invacom ADF)

The scalar ring space deeper to the Invacom, this is parameter not measured feci01.

The longest waveguide part section, with the distance 34mm, the ending simple pipe parts need puting int to the Inverto Black Ultra (Pic 4)

If you have questing, feel free to write.

Best, regards,

SaTom

FYI: I´ve merged above reports (from Badr-7 toppic) in this new toppic here.

where can I buy such device?

Quote from wellikan

where can I buy such device?

After I first posted the results at the reception with these scaling rings, many enthusiasts bought them, and AliExpress sold out. It was indeed cheap too. For this reason, when I was looking to buy more for a friend, I saw this info on their site.

They probably didn't expect such a good sale.

feed horn/waveguide Conical Scalar Ring for KU LNB with BRACKET/MOUNT/Holder:

feed horn/waveguide Conical Scalar Ring for KU LNB with BRACKET/MOUNT/Holder | eBay

Find many great new & used options and get the best deals for feed horn/waveguide Conical Scalar Ring for KU LNB with BRACKET/MOUNT/Holder at the best online…

www.ebay.com

Price: US $29.00

Located in: China

Da es sich nicht um ein Trichter Feed handelt, wäre ein Nachbau relativ einfach.

Schritt 1:

Man muss nur ALLE Grundmaße kennen. (Rillenabstand und Tiefe haben einen Zusammenhang zur Frequenz.)

Auch die Rückseite sollte passgenau sein und Schrauben nur zur Fixierung und nicht zum Spannen.

Meine Gedanken dazu richten sich auf die Gesamtlänge des Hohlleiters bis zur inneren Antenne. Ob hier 34 mm passen, hängt vom tatsächlichen Zusammenbau ab.

Schritt 2:

Jemand suchen, der das Teil fräst.

Eine Firma zu beauftragen in Lohnarbeit ist sicher teurer, als die ~75€ (29$+Versandkosten+Einfuhrumsatzsteuer) für das China-Teil, ist meinerseits auch so nicht gedacht.

Since it is not a funnel feed, replicating it would be relatively easy.

Step 1:

You just have to know ALL the basic dimensions. (Groove spacing and depth are related to frequency.)

The back should also be a perfect fit and screws should only be used for fixing and not for tensioning.

My thoughts on this are based on the total length of the waveguide up to the inner antenna. Whether 34 mm fits here depends on the actual assembly.

Step 2:

Find someone to mill the part.

Hiring a company to do wage work is certainly more expensive than the ~75€ ($29+shipping costs+import sales tax) for the China part, and I didn't think so.

Just to show my Ku skew setup incl. scalar, created by "pekaku" (former user on DXtv).

Wieviel Mehrgewinn hat denn das gebracht gegenüber dem originalen Kathreinfeedhorn?

Hallo Erdfunkstelle,

sorry, aber das kann ich dir leider nicht beantworten, da ich das originale Kathreinfeedhorn seit langer Zeit (wegen Skew-Cotroll) nicht mehr angebaut habe.