Determining satellite power output?

[L.J.Tibbs]

Homework Statement

The question wants us to determine what the power output of a 2.32 GHz geosynchronous satellite that has an antenna gain of 18 dB be for a mobile receiver that is operating with an effective antenna gain of 3 dB in order to achieve the FM threshold (6 dB).

Homework Equations

Not sure

The Attempt at a Solution

I'm not certain what to do with this problem at all. I know the altitude is about 36,000 km above the equator. I'm thinking of doing something with EIRP, but we don't have transmit power. I believe that the FM threshold of 6 dB is the C/N, but I'm not certain of that. It seems like we're missing info, but I was told that everything we need to solve the problem is given.

What I really need is a boost in the right direction! If someone could give me a hint to help me get started, I'd be appreciative!

 

[KataKoniK]

Hi there,

To solve this problem, you will need to use the equation for link budget, which is used to calculate the power budget for a communication link. The equation is as follows:

Power received = Power transmitted + Gains - Losses

In this case, the power received is the FM threshold of 6 dB, and the power transmitted is what we are trying to find. The gains are the antenna gains of the satellite and the mobile receiver, and the losses are any losses in the signal due to atmospheric effects or other factors.

To start, you will need to convert the antenna gain of 18 dB to a linear scale. This can be done using the equation:

Antenna gain (linear) = 10^(antenna gain (dB)/10)

Once you have this value, you can plug it into the equation for link budget, along with the given values for the satellite's frequency and altitude, to solve for the transmitted power.

I hope this helps get you started! Let me know if you need any further assistance.