Need help with feedhorn and F/D

koansrc

Regular Member
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My Satellite Setup
CM 3.0m @ 28.2 w PACE
My Location
Athens-Greece
#1
I've done my research, searched the threads, followed the links, looked at the pics, noted peoples comments, searched the net ... and now I have more information than I can handle :-wow ... please help.

I want to hook up a 2nd digibox and thus change my single lnb with a twin C120 type (and hopefully also see an improved signal)
Dish is 1.55mX1.35m, metal, noname and always at 28.2E
Currently signal is best when the lnb is pushed right back away from the dish.
Using the F/D calculator and measurements i just made (darkness!) i THINK my dish is f/d 0,48 (does that sound right?)

Looking at invertor or invacom, the specs for the invertor universal (e.g) read "F/D of feed 0.6-0.7". Does that mean it's not suitable for my dish ? or is it referring to the F/D needed from the feedhorn, in which case I have to find a feedhorn with an F/D of 0,48 ?

- The calculator I mention I linked to from this post :http://www.satellites.co.uk/satellite/fringe-reception-general/49990-gibertini-feedhorn-improving-reception-2.html#post270513
 

koansrc

Regular Member
Messages
315
Likes
0
My Satellite Setup
CM 3.0m @ 28.2 w PACE
My Location
Athens-Greece
#2
koansrc said:
I've done my research, searched the threads, followed the links, looked at the pics, noted peoples comments, searched the net ... and now I have more information than I can handle :-wow ... please help.

I want to hook up a 2nd digibox and thus change my single lnb with a twin C120 type (and hopefully also see an improved signal)
Dish is 1.55mX1.35m, metal, noname and always at 28.2E
Currently signal is best when the lnb is pushed right back away from the dish.
Using the F/D calculator and measurements i just made (darkness!) i THINK my dish is f/d 0,48 (does that sound right?)

Looking at invertor or invacom, the specs for the invertor universal (e.g) read "F/D of feed 0.6-0.7". Does that mean it's not suitable for my dish ? or is it referring to the F/D needed from the feedhorn, in which case I have to find a feedhorn with an F/D of 0,48 ?

- The calculator I mention I linked to from this post :http://www.satellites.co.uk/satellite/fringe-reception-general/49990-gibertini-feedhorn-improving-reception-2.html#post270513
Can't find the EDIT your post button, so these are the actual dimensions.
Dish is actually 138cmX122cm (live and learn I guess:mad: ), and I make the lnb distance 65cm. With these dimensions I now get an F/D of 0.50.
 

koansrc

Regular Member
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315
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My Satellite Setup
CM 3.0m @ 28.2 w PACE
My Location
Athens-Greece
#3
I've identified my dish! It appears I own a TECATEL AL-G135FNZ and found the specs ! I'm sure you are all dying to know :

Dimensions : 137 x 122
Gain at 12.5GHz : 43Db
Efficiency : 80%
Polarization : >35
Beamwidth : 1.10
F/D : 0.52

So does anyone know of a feedhorn with an F/D of 0.52 ???? and where to buy one ????
 

dxsat

Specialist Contributor
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My Satellite Setup
Snap's setup: (In Spain) Humax HDR, Prodelin 1.8m dish + Invacom QDF-031 + CM feed, (In UK) CallFlow VDSL + EE 4G, Sky Q, YouView HD, Mac OSX, iOS
My Location
UK: Tonbridge, Kent. Spain: Madrid.
#4
You have an offset dish. Tecatel no longer make this model.
It looks to me as if the F/D ratio you quote is too small, that is very unusual for an offset. Offset F/D is mostly around 0.6.
In one post your dimension is 1.55mX1.35m, the last you say 137 x 122. Which is correct? You can buy an offset feedhorn at HiSat in the UK for about £20, which has an F/D of 0.66, or a ChannelMaster offset feed from Satellite Superstore (again in UK) for about £65. This might be your better option.
The Inverto LNB you quote above will probably work OK. Which LNB do you currently use?
 

Llew

cerca trova...
Staff member
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My Satellite Setup
Triple Dragon, Dreambox 8000, Echostar AD3000ip, TBS6522,6925,6983 PCie cards.
Gibertini 1.25m motorised dish driven by the AD3000, with either Inverto BU Quad or Norsat / XMW Ka LNBs . SMW 1.05m + 3 other dishes. Speccy: Promax HD Ranger+
My Location
The Flatlands of East Anglia
#5
My Offset SMW dish has a F/D of 0.5...

Llew
 

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Llew

cerca trova...
Staff member
Messages
14,464
Likes
3,403
My Satellite Setup
Triple Dragon, Dreambox 8000, Echostar AD3000ip, TBS6522,6925,6983 PCie cards.
Gibertini 1.25m motorised dish driven by the AD3000, with either Inverto BU Quad or Norsat / XMW Ka LNBs . SMW 1.05m + 3 other dishes. Speccy: Promax HD Ranger+
My Location
The Flatlands of East Anglia
#6
The SMW 1.4M version is even tighter (0.45)

Llew
 

Likvid

ASBO Club Member - Persona non grata
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My Location
Stockholm, Sweden
#7
Do you have the SMW 1.4 as well?

The SMW dishes are the best plastic dishes as they are made in ABS, you can drive a truck over them and they still keep the shape, a SMC dish like Andrew would crack.
 

Llew

cerca trova...
Staff member
Messages
14,464
Likes
3,403
My Satellite Setup
Triple Dragon, Dreambox 8000, Echostar AD3000ip, TBS6522,6925,6983 PCie cards.
Gibertini 1.25m motorised dish driven by the AD3000, with either Inverto BU Quad or Norsat / XMW Ka LNBs . SMW 1.05m + 3 other dishes. Speccy: Promax HD Ranger+
My Location
The Flatlands of East Anglia
#8
No Likvid. Pockets not deep enough with the price they were :eek:

Llew
 

Likvid

ASBO Club Member - Persona non grata
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1,752
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My Location
Stockholm, Sweden
#9
Original SMW feedhorn and everything you got, nice dish.

Must perform very good.
 

Llew

cerca trova...
Staff member
Messages
14,464
Likes
3,403
My Satellite Setup
Triple Dragon, Dreambox 8000, Echostar AD3000ip, TBS6522,6925,6983 PCie cards.
Gibertini 1.25m motorised dish driven by the AD3000, with either Inverto BU Quad or Norsat / XMW Ka LNBs . SMW 1.05m + 3 other dishes. Speccy: Promax HD Ranger+
My Location
The Flatlands of East Anglia
#10
Been working faultlessly for close on 15 years (Arkivator actuator), only recently with an Invacom C120 - had the Invacom LNBF earlier.

Llew
 
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