C Band Ku Band Details For CATV Headend

C Band Ku Band Details For CATV Headend

 

If you are a Headend Engineer or working for cable industry like Headend INFO then there is basic need for you to understand the phenomenon behind the C Band Ku Band system. These two things are most essential part of a headend weather it is Digital Headend or Analog Headend.

Satellite  Communication

There are lot of satellites are available in the orbit  which are responsible for the communication like TV Network , Satellite Phone , Military Services , Weather information and GPS (Global Positioning System).

Transmitter , Antenna , Power Generator and Amplifier are the equipments which we are using in the satellite communication. The Orbit is divided into two sections like

GSO

LEO

GSO

GSO stands for Geo Stationary Orbit. It is 35,786 Km above the earth equator and its rotation is synchronized with the earth’s equator. There are lot of satellites placed in the Geo stationary orbit because these are wider in size and cover lot of space with the high transmission power.

LEO

LEO stands for Lower Earth Orbit. LEO is 3000 Km above the earth equator. LEO satellites transmission power is not high as the the satellites are in the GSO also the satellites are not wider as compared to GSO.

C Band Ku Band Details For CATV Headend

Classification Of Bands:-

BANDS

RANGE

L-Band

1 – 2 GHz

S-Band

2 – 4 GHz

C-Band

4 – 8 GHz

X-Band

8 – 12 GHz

Ku-Band

12 – 18 GHz

K-Band

18 – 27 GHz

Ka-Band

27 – 40 GHz

V-Band

40 – 75 GHz

W-Band

75 – 110 GHz

L Band (1-2 Ghz)

image source google

 

L band space is very expensive because there is not much bandwidth available in the L band. Lower Earth Orbit Satellite uses the L Band. L Band beam is wider and RF equipment for this is not expensive. L Band equipments are easy to use because there is not need of accuracy of beam because of its wider beam.

Applications of L band

Miltary Satellites , GPS (ground positioning system) Satellites , Satellite Phones and WorldSpace satellite Radio.

C Band (4-8 GHz)

image source google

C Band satellite transmit approximately 6 Ghz and receive approximately 4 Ghz. We use large antenna for C band that is around 2.4 to 3.7 meter in size. At some particular location in the world the requirement of the C Band antenna size is 3 to 3.7 meter for proper reception of signals. The larger antenna size gives less interference.

Downlink frequency range for C Band is 3.7 to 4.2 Ghz while Uplink frequency range for C Band is 5.9 to 6.4 Ghz.

Ku Band (12-18 Ghz)

image source google

 

This is called the lower portion of the K Band because this letter connected “u” with K comes from the German word which means under.

As we know this is higher frequency range for this we need high accuracy of beam. Because beam is narrow for the Ku band. We use the small size dish for the reception of signal as compared to the C band. The size for the Ku band is around 1 meter of dish.

This is generally using for satellite TV and VSAT. There is one major problem with Ku Band is that signals are droped in rainy weather. But this prob

lem can be avoided by using high transmission power which cost you more. Also this problem can be avoided by using large diameter dish.

Ka Band (18-40 GHz)

image source google

 

The letter “a” connected with K comes from German word which means above. So this is called the above K-band.

This is extremely high frequency band and also it is expected that it will be using for future also. It is less expensive band. We need high accuracy for the Ka band due to its narrow beam for which we need to purchase high quality RF equipments which are expensive.

Ka Band is using for High Definition Satellite TV , Satellite Phone backhaul and also for Terrestrial VSAT.

 

 

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