Would anyone consider using the transmission line loss of 1dB as the "output power of the transmitter" into the antenna? That would mean 475 watts carrier for symmetrical sinewave instead of the "understood" 375 limit. Just more fuel for the fire. Just have a power sensor at the antenna input terminal. Claim it's the final output of the station. Consider this: 1KW DC input. Transmitter is 70% eff at TEN METERS. 700 Watts out into the 1dB transmission line. That gets power down to 550 Watts carrier into the antenna which is .87 dB over the "spec" if considering symmetrical modulation. If one were to drop the audio gain by .87 dB, the station is in compliance with the 1500 Watts at the ANTENNA input terminal. Its all "fly doodoo" in the ocean as far as I'm concerned. I the end... most people see the potential 3000 Watts PEP (750 watts X4)old limit versus the 1500 Watt new limit as the 3 dB cut in power. Maybe, but it is only 1/2 S-unit using the worst case math loss. I include my PATH loss in the math loss to justify using my homebrew rig. Actually, the new rules give the SSB operators at least 300 watt more PEP. 2000 X 60% class B = 1200 watts old rules. My opinion is that there was no intention to reduce power, since it really didn't for the MAJORITY of the hams. Only a "convenient global" power measurement method was needed. The AMers (myself include) brought attention to the AM power issue). Maybe it was (and is) un-necessary. Lets not forget that the "DC input rule" change was also for SSB guys as well. Since the SSB manufacturers were not burdened to include both Plate voltage and Plate current on their linears (or rigs), The FCC did not want to dig into the final's circuitry to make the frivolous and dangerous measurement. These are the words (paraphrased) by Steven mendohlson, director of the Hudson division during those power struggle days. I think you are all loosing to much sleep over this... Just forget about it, use your rigs in a polite manner, operate and be happy. Nobody cares about a few dB anyway. 10 dB! yes of course. 1 to 3dB? be real. Most meters are 1dB best accuracy anyway. George AB2KC
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of John E. Coleman Sent: Sunday, September 29, 2002 11:32 PM To: AMRadio Subject: [AMRadio] New link to Info on AM and legal power limits. I've be working on a document that might be of interest to many folks. With the help of K4KVY, WA3WDR, W5TOB and a month or two of night work I've come up with something good I hope. Anyway here it is. http://www.qsl.net/wa5bxo/asyam/aam3.html I hope it is of some use to someone and encourages experimentation. John, WA5BXO _______________________________________________ AMRadio mailing list [email protected] http://mailman.qth.net/mailman/listinfo/amradio
