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# How do you find EIRP in this question

Posted on 2009-05-12
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Where does EIRP 60 dBm come from in the solution to the question below
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Question by:jtiernan2008
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Expert Comment

ID: 24371311
hi jtiernan2008,

.
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Author Comment

ID: 24371323
hi :)
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Expert Comment

ID: 24371354
The 60dbm comes from the 1 KW power of the transmitter mentioned in the problem statement.
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Author Comment

ID: 24371359
What is the 1KW power to do with the EIRP?
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Expert Comment

ID: 24371374
The problem says that the EIRP of the transmitter was 1 KW. The equation with the 60DBM was sritten for a transmitter with much less power. The 60 dbm makes the equation good for a 1 KW transmitter
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Author Comment

ID: 24371376
so is 60 just an arbitrary number?
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Accepted Solution

aburr earned 2000 total points
ID: 24371398
no. Look up where the equation first appears in your notes. There it will tell what power the transmitter should have. It will not be 1 kw. The 60 db steps up the output power required by the equation to the 1 kw level.
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