Feedhorn Channel Master, Laminas, Invacom QDF

Eusebius Punz

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Hello!

I am searching for a Channel Master, Andrews or Raven Feedhorn
alternative a Laminas Feedhorn PO 40
and a Invacom Quad LNB flange QDF 031.
 

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I assume for an offset dish, Ku band.

Receive only or R/T ?

New / used ?
 

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Apologies, I didn't know Laminas did prime focus (or Raven for that matter )

I do have some (very) old p/f feeds in the box of bits, but from memory the clamping arrangement of the Channel Master is four arms, and I think the ones I have are triples only, IRTE style, though I do recall a couple of single clamp feeds from 90cm dishes I was selling a number of years back. All are four bolt connection to a polariser, so you would almost certainly have to adapt the bolt holes for attaching a universal LNB.

Which f/d are you looking for ?
 
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Apologies, I didn't know Laminas did prime focus (or Raven for that matter )

I do have some (very) old p/f feeds in the box of bits, but from memory the clamping arrangement of the Channel Master is four arms, and I think the ones I have are triples only, IRTE style, though I do recall a couple of single clamp feeds from 90cm dishes I was selling a number of years back. All are four bolt connection to a polariser, so you would almost certainly have to adapt the bolt holes for attaching a universal LNB.

Which f/d are you looking for ?
Ah! The title got me too... I was thinking Ku-band Rx-only or Rx/Tx feedhorns for offset dishes (f/D usually around 0.6).
But a CM Ku-band feedhorn for a PF dish... Hmmm.
Perhaps it would be more informative if OP shared the dish type and what bands he is looking for?
 

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The Laminas PO-40 feedhorn is also for offset dishes
 

Eusebius Punz

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I wanna pick up the uk-spot in Austria. Means i Need a dish with 2,4 m or more. The Laminas PO 40 feedhorn is for Offset dishes, yes.
I have buyed the dish used as a bargain and don´t know the manufacter. I used a old groves feedhorn, the invacom ADF 120 and the gibertini Feedhorn but get no good results. This feedhorn test on Forum.dxtv impressed me. DXtv.de | LNB allgemein | Test Feedhorn. Close to me someone get Signal with a 2,3 m PFA and invacom quad lnb.
 

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If the dish is bent, no feedhorn can help.

Invacom ADF would be OK then.
 

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I wanna pick up the uk-spot in Austria. Means i Need a dish with 2,4 m or more. The Laminas PO 40 feedhorn is for Offset dishes, yes.
I have buyed the dish used as a bargain and don´t know the manufacter. I used a old groves feedhorn, the invacom ADF 120 and the gibertini Feedhorn but get no good results. This feedhorn test on Forum.dxtv impressed me. DXtv.de | LNB allgemein | Test Feedhorn. Close to me someone get Signal with a 2,3 m PFA and invacom quad lnb.

What dish have you bought/installed? It isn't clear from your earlier post
 

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Exactly..... what is missing in this thread from very beginning, is bunch of pictures.
 
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Eusebius Punz

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I have buyed the dish used as a bargain and don´t know the manufacter. It´s a GFK dish with 2,4 m with no name on it and 3 feed arms. I´ve searched in the net but did not find anything about it. I get Signal on 10906, 10758 and 10729 from the uk-spotbeam.
 

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I have buyed the dish used as a bargain and don´t know the manufacter. It´s a GFK dish with 2,4 m with no name on it and 3 feed arms.
- used;
- bargain;
- no name;
- 3 feedarms
It is too general description of your dish. Couple of simple photos could potentially help to recognize your dish.
Did you do string-test to check whether your dish is warped or not? Did ypu measure it's diameter and depth?
 

Eusebius Punz

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No. I think this is the fortec star. Many write about the poor Quality. I´ve searched in the net multiply about my dish and did not find anything. I´ve Change the rusty feedarms against threads for better aligning. The dish have 2,4 m, deepth 31 cm, F/d was 116 cm. Thanks for your help. But this feedhorn test from Forum.dxtv.de impressing me.

an der Laminas AS 1800 auf Türksat
Messgerät
Laminas Feedhorn PO 40
Frequenz/MHz LNB Modus Modulation Symbolrate Pegel/dBμV SN/dB CBER VBER PER
East 11095,5 18V DVB-S 30000 74,0 12,9 8,85E-6 <1,00E-8
West 11774,5 14V/22kHz DVB-S2 8PSK 27500 82,0 12,8 2,68E-3 <1,00E-5
Channelmaster / Skyware Globale
Frequenz/MHz LNB Modus Modulation Symbolrate Pegel/dBμV SN/dB CBER VBER PER
East 11095,5 18V DVB-S 30000 74,0 12,8 9,98E-6 <1,00E-8
West 11774,5 14V/22kHz DVB-S2 8PSK 27500 82,5 12,9 2,44E-3 <1,00E-5
Gibertini
Frequenz/MHz LNB Modus Modulation Symbolrate Pegel/dBμV SN/dB CBER VBER PER
East 11095,5 18V DVB-S 30000 75,0 11,9 9,23E-5 <1,00E-8
West 11774,5 14V/22kHz DVB-S2 8PSK 27500 83,5 12,9 2,38E-3 <1,00E-5

This test was made on turksat but the lower frequency like on the astra 2e spotbeam tp. are much better with the laminas and channel master feedhorn.
 
A

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I have buyed the dish used as a bargain and don´t know the manufacter. It´s a GFK dish with 2,4 m with no name on it and 3 feed arms. I´ve searched in the net but did not find anything about it. I get Signal on 10906, 10758 and 10729 from the uk-spotbeam.
GFK (Glasfaser Verstärkter Kunststoff) == SMC.
OP has a plastic dish. Not a rustbucket... :)

Hate to repeat, but pictures says it all ;)

Edit:

1) If this is an old dish, you may find that it's a C-band dish, which is not so effective for Ku. But you should not stop trying, you have nothing to loose.
2) Quickest and cheapest first step is to get a Golden Interstar GI-209P, which is a Ku-band single LNB with PF feedhorn. @RimaNTSS have used this with good results - and they're quite cheap, at least a 1/6 of thr price of a Ku feedhorn + the Invacom LNB. Then you can decide if it's good enough, or to try and squeeze a little extra from using different feedhorn etc.
 
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Channel Hopper

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GFK (Glasfaser Verstärkter Kunststoff) == SMC.
OP has a plastic dish. Not a rustbucket... :)

Hate to repeat, but pictures says it all ;)

Now we are getting somewhere.

The only dish I know with three petals at that size, in SMC is the Prodelin 1252/3, but the f/d would be a fraction, not 116 cms ?

Nevermind

http://www.gdsatcom.com/vsat/Technical_Docs/geometry_drawings/4000-027.pdf

http://www.gdsatcom.com/vsat/Technical_Docs/geometry_drawings/4000-010.pdf

http://www.gdsatcom.com/vsat/Technical_Docs/assembly_manuals/4096-479.pdf


NB - the feed on Page 26

Note really well the feed on page 26
(reiterate)
Note REALLY WELL the feed design on Page 26
 
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Now we are getting somewhere.

The only dish I know with three petals at that size, in SMC is the Prodelin 1252/3, but the f/d would be a fraction, not 116 cms ?

Nevermind

http://www.gdsatcom.com/vsat/Technical_Docs/geometry_drawings/4000-027.pdf

http://www.gdsatcom.com/vsat/Technical_Docs/geometry_drawings/4000-010.pdf

http://www.gdsatcom.com/vsat/Technical_Docs/assembly_manuals/4096-479.pdf


NB - the feed on Page 26

Note really well the feed on page 26
(reiterate)
Note REALLY WELL the feed design on Page 26
Very good.
But OP says three feed-arms, not petals.
I would guess that this could be anything, including Eastern-block dishes from 80's?

picturespitcturespictures... ;)
 

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Very good.
But OP says three feed-arms, not petals.
I would guess that this could be anything, including Eastern-block dishes from 80's?

picturespitcturespictures... ;)

I don't know of any other plastic/fibre dish with three feed arms, regardless of the quantity of petals. All it does is eliminate the two/four/eight segmented models from the list of 2.4m/8' versions and there aren't too many of those either in non metal finish.
 
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