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Reg. Transmit & Receive power - RF Cafe Forums
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| gopi80in
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Post subject: Reg. Transmit & Receive power
Posted: Fri Dec 22, 2006 7:27 am
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Joined: Fri Dec 22, 2006
6:44 am
Posts: 1
Location: INDIA
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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
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sm7ovk |
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Post subject:
Posted: Thu Jan 11, 2007 1:19 pm
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| Captain |
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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
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nubbage |
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Post subject:
Posted: Fri Jan 12, 2007 4:35 am
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| General |
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Joined: Fri Feb 17, 2006
12:07 pm
Posts: 268
Location: London UK
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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.
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Posted 11/12/2012
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