Antenna Diameters

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The diameter of an antenna to be used for watching TV broadcasts varies according to regions. Radiation powers of Türksat satellites varying according to regions can be found on the coverage range maps in our web site. The approximate antenna diameters required according to these radiation powers are given in the following table. The significant factors in determining antenna diameter are listed below:

  • Since the signal quality would rise as the Noise Figure of LNB gets lower, this parameter affects the antenna diameter. The antenna diameters required for LNB's NF intervals of 0.6-0.7 dB and 0.8-1.0 dB are given separately. 
  • The precipitation regime of the region is a very important factor in determining the antenna diameter. Rain weakens significantly the microwave signals used in satellite communication. For getting a lower impact of rain within extremely wet regions, antenna diameters corresponding to 3 dB or a weaker EIRP level can be preferred. Some instantaneous interruptions may be experienced during very heavy rain even with large antennas.
  • Poor-quality, worn, divided and multiplexed, or very long cables would expose an attenuation impact, so these factors must be taken into consideration while determining the antenna diameter. For cables longer than 20-30 m or of poor quality, an antenna diameter corresponding to an EIRP level 1-3 dB lower than the EIRP level of the region compared to cable distance.

EIRP-Antenna Diameter

EIRP

LNB NF (dB)

 

0.6 - 0.7

0.8 - 1.0

55 dBW

50 cm

50 cm

54 dBW

50 cm

55 cm

53 dBW

55 cm

60 cm

52 dBW

60 cm

60 cm

51 dBW

60 cm

75 cm

50 dBW

60 cm

75 cm

49 dBW

75 cm

90 cm

48 dBW

80 cm

90 cm

47 dBW

90 cm

100 cm

46 dBW

90 cm

100 cm

45 dBW

100 cm

110 cm

44 dBW

110 cm

120 cm

43 dBW

120 cm

120 cm

42 dBW

120 cm

135 cm

41 dBW

135 cm

150 cm

40 dBW

150 cm

180 cm

39 dBW

180 cm

240 cm

38 dBW

240 cm

300 cm

37 dBW

300 cm

360 cm