Hi Bret; That could be because the ratio of 25 watts to 100 watts is 4, an increase of 6 dB, while the ratio of 300 to 500 is 1.7, an increase of 2.2 dB and 300 to 600 is a ratio of 2 or 3 dB.
73, Ed Richards K6UUZ On Tue, 28 Sep 2004 08:14:24 -0400 Brett gazdzinski <[EMAIL PROTECTED]> writes: > I know about the DB thing, but people running a bit of power always > seem much stronger than the guys running 25 or 50 watts. > > I cant say why, but in a qso with a bunch of people, the guys > running 200 to 300 watts are always much stronger on the meter, and > sounding, > than the 50 watt guys. > > For some reason, the biggest jump seems to be between about 25 watts > and 100 watts. > I don't think you HEAR as much change between say 300 and 500 watts, > or even 300 and 600 watts, but go between 25 and 100 watts and it > seems very > noticeable at the other end. > > Maybe the losses in the antenna circuit are a much bigger percentage > of the power out when running 25 or 50 watts? > > You can see the difference in signal strength when someone turns up > the > power, > and it seems to track with the DB rule, but there still seems to be > some threshold effect in most cases. > With 25 watts, its hard to get clearly above the noise floor in many > cases, while 100 watts and up does it easy in clear band conditions. > > Most times, on clear conditions on 40 meters, the guy running the > rice box at 25 watts is just above the noise floor at about 1 s > unit. > He may run between s1 and s3. > The guy running 100 watts will run s6 to s9 or higher, and be > arm chair copy. That FIRST 3 to 6 db boost seems to be the most > critical. > > And I have NEVER heard someone running 25 watts and a REALLY good > antenna > out strapping a 500 watt rig into a regular antenna. > > > And, although its easy to run an amp and boost power a little, it > seems crazy to run a pair of heavy tubes and get 300 watts out, > when a pair of 813 tubes plate modulated will do 700 watts > of carrier easy, and well over 2000 watts pep! > > A pair of 812a's will give 300 watts carrier without trouble! > > > Brett > N2DTS > > > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of RJ Mattson > Sent: Monday, September 27, 2004 7:07 PM > To: Discussion of AM Radio > Subject: Re: [AMRadio] WTB SB-220 > > > Again, It would be an S1 signal above a s9/30db level noise - a > barely > perceivable difference. You would have to go from 100 to ~ 6,400 > watts to > get an S3 signal above that noise level. bob...w2ami > www.qrz.com/callsign/w2ami > > > ----- Original Message ----- > From: "George Pritchard" <[EMAIL PROTECTED]> > To: "'Discussion of AM Radio'" <amradio@mailman.qth.net> > Sent: Monday, September 27, 2004 9:38 AM > Subject: RE: [AMRadio] WTB SB-220 > > > > When the interference is also at 30 over S9(even if it's static > > crashes) a 36 dB over signal using the 400 watts helps. First put > up > > the best ant... Then crank-it with juice!!! George AB2KC > > 1KW 4X1 lives > > > > -----Original Message----- > > From: [EMAIL PROTECTED] > > [mailto:[EMAIL PROTECTED] On Behalf Of RJ Mattson > > Sent: Monday, September 27, 2004 9:27 AM > > To: Discussion of AM Radio > > Subject: Re: [AMRadio] WTB SB-220 > > > > > > No matter what the spin, 100 to 400 watts is only 1 s-unit and > barely > > perceptible at the receiver. A 30db/s9 signal is from a good > antenna > > not from 100 or 400 watts. > > bob...w2ami > > www.qrz.com/callsign/w2ami > > > > > > ----- Original Message ----- > > From: "Jim Candela" <[EMAIL PROTECTED]> > > To: <amradio@mailman.qth.net> > > Sent: Sunday, September 26, 2004 10:47 PM > > Subject: Re: [AMRadio] WTB SB-220 > > > > > > Hmmm, the boys on 3878 are running 1500 watts pep plus > > > on USB, and there is a 100 watt AM'er calling CQ on > > > 3880. How much of an antenna would the AM'er need to overcome > the > > > S/N ratio? I think Astabula Bill, W8VYZ says it all: > > > > > > http://www.amwindow.org/audio/mov/w8vyz.mov > > > > > > Ever hear Bill running 100 watts? When Bill and Less > > > K6HQI (sk) were regulars on 14286 they had to run > > > heavy iron to hold the frequency. A 100 watt rig was > > > seldom heard whereas a 500 watt rig (that 6db again) > > > was often armchair copy, and sometimes often drive the > > > QRM away. > > > > > > Regards, > > > Jim > > > > > > RJ Mattson <[EMAIL PROTECTED]> wrote: > > > If you can't get out consistantly with a Viking II, > > > you need an antenna - > > > not an amp. > > > bob...w2ami > > > www.qrz.com/callsign/w2ami > > > > > > ______________________________________________________________ > > AMRadio mailing list > > Home: http://mailman.qth.net/mailman/listinfo/amradio > > Help: http://mailman.qth.net/mmfaq.html > > Post: mailto:AMRadio@mailman.qth.net > > > > ______________________________________________________________ > > AMRadio mailing list > > Home: http://mailman.qth.net/mailman/listinfo/amradio > > Help: http://mailman.qth.net/mmfaq.html > > Post: mailto:AMRadio@mailman.qth.net > > > > > ______________________________________________________________ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net > > ______________________________________________________________ > AMRadio mailing list > Home: http://mailman.qth.net/mailman/listinfo/amradio > Help: http://mailman.qth.net/mmfaq.html > Post: mailto:AMRadio@mailman.qth.net >
