And while we're on the subject... the correct unit is dB, not dBm. Remember that dB is a relative term. In the case of amplifier gain, this is relative. The unit dBm is an absolute unit relative to 1 milliWatt. When the amplifier is finally built, it will have 50 dBm of output power (assuming it is driven with enough input signal) and will have 13 dB of gain.
Al. ----- Original Message ----- From: "S55M" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]>; <[EMAIL PROTECTED]>; <elecraft@mailman.qth.net> Sent: Wednesday, March 30, 2005 12:41 PM Subject: Re: [Elecraft] OT: math question > dBm's > > Just remember this (no maths:))) : > Every 3dB increase is power multiplied by 2 times (1W to 2W is 30dBm to > 33dBm) > So 1W+3dB (1x2=2) is 2W+3dB (2x2=4)4W+3dB(4x2=8)8W and so on. > Every 10dB increase is power multiplied by 10 (1W to 10W is 30dBm to 40dBm > 100W to 1KW is 50 dBm to 60 dBm the easy one HI) > And dont care abt digits on calcullator (try to see 0,5dB on Your S-meter or > ask someone on the band to change the power from 100W to 50W or from 10W to > 5W (3dB) You will see practically no difference. > Why dBm? Because dBm is power related to 1mW=0dBm . > > S55M-Adi > _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
