Rule is:
dBm = log10 (mW)*10 or: mW = 10^(dBm/10)
Which means: 0 dBm = 1 mW 10 dBm = 10 mW 14 dBm = 25 mW 15 dBm = 32 mW 16 dBm = 40 mW 17 dBm = 50 mW 20 dBm = 100 mW 30 dBm = 1000 mW = 1W
If you remember that +3db = *2, -3db = /2, and +10db = *10 you can do all kinds of quick in-your-head calculations.
+3db = *2 +6db = *4 (2*2) +7db = *5 (+10db-3db = 10/2) +4db = *2.5 (+10db-6db = 10/4) +1db = *1.25 (+4db-3db)
--
Brian Lloyd 6501 Red Hook Plaza, Suite 201 [EMAIL PROTECTED] St. Thomas, VI 00802 +1.340.998.9447 - voice +1.360.838.9669 - fax GMT-4
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