K.I.S.S. 10db = 10 times 3db = 2 times
Add Products. Guess anything else. No calculators. The original question, 5:100: 5:10 = 2x = 3db 10:100 = 10x = 10db Sum: 13db. Example: 25w up to 600. 3db is 50w 13db is 500w 600 is a little bit more. Call it 14db. Example: 12W to 80W 24 is 3db 48 is 6db 96 is 9db. So 8 is a fine guess. Dan / WG4S / K2 #2456 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED] Sent: Wednesday, March 30, 2005 2:21 PM To: S55M; [EMAIL PROTECTED]; [EMAIL PROTECTED]; elecraft@mailman.qth.net Subject: Re: [Elecraft] OT: math question Im with Adi on this one..i.e NO MATH!. Although I'm 100% certain Don is correct, my "fingers" came with *about* a 12.6 dB increase. (I never did understand those loggers) Tom WB2QDG K2 1103 -------------- Original message ---------------------- From: "S55M" <[EMAIL PROTECTED]> > 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 > > > ----- Original Message ----- > From: "W3FPR - Don Wilhelm" <[EMAIL PROTECTED]> > To: <[EMAIL PROTECTED]>; <elecraft@mailman.qth.net> > Sent: Wednesday, March 30, 2005 8:23 PM > Subject: RE: [Elecraft] OT: math question > > > > dB = 10 log (P2/P1) > > For your example of 5 watts to 100 watts, is an increase of 13.01029996 > dB - > > pardon the rounding but that is all the digits my calculator shows :>). > > > > 73, > > Don W3FPR > > > > > -----Original Message----- > > > > > > How would one calculate the amplifier gain (in dB) required to go > > > from one > > > power level to another? For example from 5W to 100W. > > > > > > K3UJ > > > > > > _______________________________________________ > > 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 > > _______________________________________________ > 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 _______________________________________________ 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 _______________________________________________ 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
