Hi Joe, Generally for 100% positive modulation, 1500W PEP translates into a 375Watt carrier. (These are output levels.) But in the real work=ld, this ain't necessarily so... Check WA5BXO's website, there is some interesting reading on AM power regarding carrier and modulation vs. PEP.
http://www.qsl.net/wa5bxo/ In particular on John's WA5BXO site, check AM Tech Page, Natural Asymmetrical Modulation, and Amplitude Modulation and PEP. Bacon, WA3WDR ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[email protected]> Sent: Sunday, May 18, 2003 1:14 PM Subject: [AMRadio] AM Power Level > I'm a new subscriber to the list, and I have not discovered the way to do a search > through the old archives. Forgive me if this has already been covered. > > I'm currently in the process of collecting the parts to build a Class-E Am transmitter > and Class-H modulator for 75 meters. (I was quite surprised at the relative > simplicity of the circuit!) While I have been a boatanchor collector for years, and > also an on-and-off-again Electric radio subscriber (though I have every issue) I have > never yet been on the air in AM mode. Listening on 75 off and on over the years > has me itching to finally change that. > > I'm interested to know if I understand the newer FCC power guidelines correctly and > how peak power on AM is measured. The FCC now stipulates 1500 watts peak > output. Am I correct in understanding that in AM, the peak output at 100% > modulation is four times the carrier level? Does this mean that if one is to be strictly > within the FCC rules, you can have a carrier of only 375 watts in the AM mode? > > My proposed transmitter will be capable of a unmodulated 600 watt carrier. > Fortunately, it appears to be a simple matter to reduce power in a Class-E amp just > by lowering the supply / modulation voltage to the MOSFET drains. > > Any help in furthering my understanding is appreciated. > > Thanks! > > 73, > Joe > N6DGY > > > _______________________________________________ > AMRadio mailing list > [email protected] > http://mailman.qth.net/mailman/listinfo/amradio
