disisku_22 said:I know that increase in frequency will decrease the range(R=k*Pt/(Pr*f)). But how can satellites communicate with base station, operating at higher frequency....
As I have mentioned in my first reply: With the frequency the gain of both receive and transmit antennas increase as well and - more or less (neglecting some parasitic influences) cancels the increased "free space loss". A calculation of the link budget considers all losses, gains, bandwidths and noise sources and arrives at a minimum power to be transmitted to the spacecraft.disisku_22 said:.........if we increase the frequency the distance will decreases correct.., so how can satellite(which uses high freq in order of GHz) is communicating with the base station which is very far range/distance. Is Tx power is play major role here.........?
Azulykit said:this is a common belief, namely that there is some magic that causes space loss to increase with increasing frequency........ In this case "space loss" increases with increasing frequency. This is really due to a decrease in transmitting and receiving aperture size with increasing frequency and not an increase in the insertion loss associated with propagation.
Well that is a missword....No frequency travel better than any other....All traveldisisku_22 said:hi
.................Which is reinforced for the fact that short wavelength travel
Longer distances.................
What is the relation between the wavelength and the distances.......... can you more brief on this
Thanks
kumar
Azulykit said:Another concept (associated with this subject) is effective radiated power ERP (sometimes also effective isotropic radiated power EIRP). It is just power dinto the antenna times the gain......
...................................
"Physically, it is not a "gain" since the transmitted power never is higher than the power fed into the antenna."
Be careful here, the power density at a distance from a high gain antenna will be higher than one would see from an omni. It looks just like more power was being radiated than was input to the antenna port. If we are not using an antenna to create higher power densities then why bother with high gain antennas?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?