Need help with feedhorn and F/D

koansrc

Regular Member
Joined
Nov 14, 2006
Messages
315
Reaction score
0
Points
0
Age
60
My Satellite Setup
CM 3.0m @ 28.2 w PACE
My Location
Athens-Greece
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
Joined
Nov 14, 2006
Messages
315
Reaction score
0
Points
0
Age
60
My Satellite Setup
CM 3.0m @ 28.2 w PACE
My Location
Athens-Greece
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
Joined
Nov 14, 2006
Messages
315
Reaction score
0
Points
0
Age
60
My Satellite Setup
CM 3.0m @ 28.2 w PACE
My Location
Athens-Greece
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

Regular Member
Joined
Jun 22, 2005
Messages
745
Reaction score
70
Points
28
Age
69
Website
skyinmadrid.com
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.
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
Joined
Jan 1, 2000
Messages
16,226
Reaction score
4,197
Points
113
Age
81
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
My Offset SMW dish has a F/D of 0.5...

Llew
 

Attachments

  • Relocated SMW Dish.jpg
    Relocated SMW Dish.jpg
    199 KB · Views: 116

Llew

cerca trova...
Staff member
Joined
Jan 1, 2000
Messages
16,226
Reaction score
4,197
Points
113
Age
81
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
The SMW 1.4M version is even tighter (0.45)

Llew
 

Likvid

ASBO Club Member - Persona non grata
Joined
Jul 30, 2003
Messages
1,752
Reaction score
5
Points
0
Age
53
My Location
Stockholm, Sweden
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
Joined
Jan 1, 2000
Messages
16,226
Reaction score
4,197
Points
113
Age
81
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
No Likvid. Pockets not deep enough with the price they were :eek:

Llew
 

Likvid

ASBO Club Member - Persona non grata
Joined
Jul 30, 2003
Messages
1,752
Reaction score
5
Points
0
Age
53
My Location
Stockholm, Sweden
Original SMW feedhorn and everything you got, nice dish.

Must perform very good.
 

Llew

cerca trova...
Staff member
Joined
Jan 1, 2000
Messages
16,226
Reaction score
4,197
Points
113
Age
81
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
Been working faultlessly for close on 15 years (Arkivator actuator), only recently with an Invacom C120 - had the Invacom LNBF earlier.

Llew
 
Top