Fibo Gregorian Dual Reflector Antenna Information

Updated 19 November 2017

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The Fibo antennas was developed by Telenor Research and Development (at that time called Norwegian Telecom Research) in co-operation with Fibo-StÝp.
There is an article about "gregorian" offsetantennas in Telektronikk 4 1992

More Telektronikk issues can be found on http://www.telenor.com/telektronikk

Fibo Antenna Assembly Instruction page1 Fibo Antenna Assembly Instruction page2 Fibo Antenna Assembly Instruction page3

55cm 90cm 120cm Motor Polarmountlock  H-H polarmounts       

55x60cm

Fibo 55cm without LNB

Antenna Diameter 55x60cm
Frequency range 10,95-12,75GHz
Antenna Gain@11.7GHz 35,6dB
Antenna Offset 23.5  degrees (theoretical)
VSWR <=-1,2
Cross polarisation isolation <=-35dB
Antenna Efficiency 80% (based on 55cm apperature diameter)
73.3%(based on real surface)
See Offset antenna efficiency calculator
Antenna Beamwidth@11.7GHz N/A - 3,3 degrees theoretical
Antenna Offset N/A
Waveguide Flange C120
Reflector type Gregorian offset - two reflectors
Antenna Material Aluminium
Antenna surface Epoxy
Polarmount +/-60 degrees
Weight 8 kg
Elevation range 30-75 degrees
Declination range 30-75 degrees
Wind speed limit 45 m/s
Suited LNBs Invacom C120 Single,Twin,Quad etc.
LNBs that does NOT fit Digistar TC-22,Digistar SC-1,MTI AP8-TW,MTI AP82-TW,MTI-AP84-TW

 

90x99cm

Fibo 90cm subreflector with Invacom SNF-031 LNB

Polarmount for 90cm antenna Drawings&Pictures

Antenna Diameter 90x99cm
Frequency range 10,75-12,75GHz
Antenna Gain@11.7GHz 40,0dB
Antenna Offset 24.6 degrees (theoretical)
VSWR <=-1,2
Cross polarisation isolation <=-35dB
Antenna Efficiency 82% (based on 90cm apprature diameter)
74.8% (based on real surface)
See Offset antenna efficiency calculator
Antenna Beamwidth@11.7GHz N/A - 2,0 degrees theoretical
Antenna Offset 15 degrees
Waveguide Flange C120
Reflector type Gregorian offset - two reflectors
Antenna Material Aluminium
Antenna surface Epoxy
Polarmount +/-60 degrees
Weight 11 kg
Elevation range 30-75 degrees
Declination range 30-75 degrees
Wind speed limit 45 m/s
Pipe for Polarmount 76mm X 5mm
Bolts on reflector M8
Distance between bolts 60x116
Suited LNBs Invacom C120 Single,Twin,Quad etc., MTI AP8-TW,Digistar SC-1
LNBs that does NOT fit Digistar TC-22,MTI AP82-TW,MTI-AP84-TW

120x135cm

Fibo 120cm with north/south tracking actuator

Fibo 120cm subreflector with MTI AP8-TW LNB

(MTI Twin and Digistar Twin does not fit on this antenna)

Fibo HH Jaeger style polarmount welded onto an old Channel Master polarmount in order to obtain north/south inclined orbit tracking with dedicated actuator

Antenna Diameter 120x135cm
Frequency range 10,95-14,5GHz
Antenna Gain@11.7GHz 42,4dB
Antenna Offset 27.3 degrees (theoretical)
VSWR <=-1,2
Cross polarisation isolation <=-35dB
Antenna Efficiency 80%(based on 120cm apperature diamemter)
71.5% (based on real surface)
See Offset antenna efficiency calculator
Antenna Beamwidth@11.7GHz 1,45 degrees - 1,5 degrees theoretical
Antenna Offset 18 degrees
Waveguide Flange C120
Reflector type Gregorian offset - two reflectors
Antenna Material Aluminium
Antenna surface & feedsupport Crom & epoxy
Polarmount +/-90 degrees
Weight 11 kg
Elevation range 30-75 degrees
Declination range 30-75 degrees
Wind speed limit  
Pipe for Polarmount/Fixed mount 76mm X 5mm
Bolts on reflector M8
Distance between bolts 205x170
Suited LNBs Invacom C120 Single,Twin,Quad etc., MTI AP8-TW,Digistar SC-1
LNBs that does NOT fit Digistar TC-22,MTI AP82-TW,MTI-AP84-TW

120cm antenna assembly

 

Polarmount for 120cm antenna (old  version - later changed to the far better Jaeger style H-H mount)

Fixed mount for 120cm antenna

Motor Information

Pulse circuit for polarmountmotors.
(There are two different pulse circuits depending on how old the motor is)

 

Spec optical switch H22B1 :
www.fairchildsemi.com/ds/H2/H22B1.pdf

Mount Lock

H-H polarmounts

If you dont have the orginal Fibo polarmount for your 90cm or 120cm Fibo I recommend H-H mounts from Jaeger.  Some of this polarmounts even supports actuator for tracking.  It should not be to difficult fitting a Fibo on this mounts.

See also: 
  http://www.globalsources.com/si/AS/Jaeger-Industrial/6008800230826/pdtl/Horizon-to-Horizon-Mount/1077258011.htm

The best C120 LNB I have tested on the  Fibo is the MTI AP8-TW with a claimed nf=0.4dB (typ) compared with Invacom SNF-031 0.3dB (typ) and Digistar/Digiality SC-1 0.7dB (typ) on Astra 2D. MTI LNB's does not fit on the Fibo55cm but the Invacom SNF-031 fits wery well onto the 55cm

MTI has stopped production of AP8-TW but there is a replacement LNB called MTI AP8-STW

I get a lot of mail about spare parts and where to buy theese antennas. Unfortunatly  the  company that manufactured this antennas (Fibo-StÝp) does not exist and have not  since  the mid 90's.  It is almost  impossible to  get spareparts now.  


Satmueller.de sell Fibo antenna under the Master Focus name. Satmueller also have spare parts.

 

20©04 Jens T. Satre