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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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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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gopi80in
 Post subject: Reg. Transmit & Receive power
Posted: Fri Dec 22, 2006 7:27 am 
 
Lieutenant

Joined: Fri Dec 22, 2006 6:44 am

Posts: 1

Location: INDIA

Can any one tell me the reson for changing the BTS transmit power in +ve value( dBm or Wtts) while the Mobile receiving power is -ve value.

look forward for your reply


 
   
 
sm7ovk
 Post subject:
Posted: Thu Jan 11, 2007 1:19 pm 
 
Captain
User avatar

Joined: Thu Jan 11, 2007 12:59 pm

Posts: 16

Not sure if I understand you right, but I assume that you mean that output power is mentioned for an example as +20dBm, ie 100mW. A reciever will only recieve a fraction of this and according to the logarithmics it'll be for an example -60dBm, ie one millionth of a mW.

Some more information at www.producon.com/sm7ovk/dbformula.html

Regards

Jens


 
   
 
nubbage
 Post subject:
Posted: Fri Jan 12, 2007 4:35 am 
 
General
User avatar

Joined: Fri Feb 17, 2006 12:07 pm

Posts: 268

Location: London UK

If the power at the input to a Black Box 2 port device is +N dBm and the attenuation through the Black Box is greater than N dB, then the output expressed as dBm will be a negative value, because you have used up all the +N decibels and the "Bank Account" goes into negative territory.

Your question, as Jens implies, was rather cryptic. Some more details would help us explain better.


Posted  11/12/2012

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