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RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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about link budget - RF Cafe Forums

RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media platforms dominating public commenting venues. RF Cafe Forums began sometime around August of 2003 and was quite well-attended for many years. By 2010, Facebook and Twitter were overwhelmingly dominating online personal interaction, and RF Cafe Forums activity dropped off precipitously. Regardless, there are still lots of great posts in the archive that ware worth looking at. Below are the old forum threads, including responses to the original posts.

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esampathj
 Post subject: about link budget
Posted: Fri Dec 01, 2006 10:32 pm 
 
Captain

Joined: Fri Dec 01, 2006 12:38 pm

Posts: 8

i tried to slove this. but i couldent. can anyone?

the uplink of a satellite system has the following parameters.

earth station saturated power output 32dBW

earth station branching losses 2.83dB

earth station back off losses 4.4dB

earth station antenn gain 62dB

atmospheric losses 0.6dB

free space path losses 205.3dB

satellite receiver G/Te ratio 5.1dB/K

bit rate 120Mbits/s

the modulation scheme is 8psk and the satellite receiver noise bandwidth is equil to the minimum noise bandwidth, calculate the

EIRP of the earth station

carrier power density at the satellite antenna.

carrier to noise power density at the satellite

energy per bit density ratio

wideband carrier to noise ratio

U are doing a great help for me. coz i dont have anyone to ask about this. bye.

thx


 
   
 
esampathj
 Post subject: ?????????/
Posted: Fri Dec 01, 2006 11:23 pm 
 
Captain

Joined: Fri Dec 01, 2006 12:38 pm

Posts: 8

hi

i dont want the whole calculation.

please anyone can send the formulas.

and what is the important of the modulation scheme. 8psk?

thx


 
   
 
nubbage
 Post subject:
Posted: Mon Dec 04, 2006 7:23 am 
 
General
User avatar

Joined: Fri Feb 17, 2006 12:07 pm

Posts: 268

Location: London UK

Hi

Try the following page

http://www.satsig.net/linkbugt.htm

It is an on-line calculator. Enter your data and see if it gives a useful result.

You can find Satellite Link Budget freeware using those 3 search words in Google.

8 psk is just the modulation encoding that enables the bandwidth for a certain information rate on the serial datastream to be calculated. It effects the Bit Error Ratio for a particular value of Carrier Power/Noise Power and convolutional coding/forward error correction. Ignore it for now.

Any problems, just let us know.


 
   
 
sm7ovk
 Post subject:
Posted: Thu Jan 11, 2007 2:20 pm 
 
Captain
User avatar

Joined: Thu Jan 11, 2007 12:59 pm

Posts: 16

hi,

some examples can be found here; http://www.producon.com/sm7ovk/linkbudget.html

it's for VHF but you could check your other calculations accordingly.

Regards

Jens

Posted  11/12/2012


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