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For satellite communication, the downlink frequency is lower

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showyda

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For satellite communication, the downlink frequency is lower ?

Why ?
 

wicked

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Re: For satellite communication, the downlink frequency is l

Heres a guess, power transmission, I think that if you transmit a lower freq it carries longer distance with less power.

Does this sound correct, if so then a sattelite will have limited power compared to a ground station.

I would like to know if this is correct?
 

DonJ

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Re: For satellite communication, the downlink frequency is l

It's correct. The resources on the comm. satellite are scarce so saving power by transmitting at the lower freq is the standard choice.
Good guess :D
 

g86

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Re: For satellite communication, the downlink frequency is l

wicked said:
Heres a guess, power transmission, I think that if you transmit a lower freq it carries longer distance with less power.

Does this sound correct, if so then a sattelite will have limited power compared to a ground station.

I would like to know if this is correct?
Just another guess..similar size antenna with lower frequency means lower gain and so wide coverage.

:!::?::idea:
 

Dr_mas

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Re: For satellite communication, the downlink frequency is l

as we know the radiated power from the antenna at a distance r is inversely proportional to f² (f=frequency) and this is in any medium.
so as f increases the attenuation of the power will increase. so we need to increase the power from the source.
as there is a frequence for uplink and one for downlink so we choose the high f for the uplink because we can increase the sending power of the earth station which is difficult to make with the satellite because it has a certain amount of power to use it in the communications and to be in its orbit.
 

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