Re: [Elecraft] KPA 500 - Can you use it on AM?
The peak of a 100%-modulated AM signal is twice the amplitude of the unmodulated carrier, or 4 times the power. So the keep the peak power below 500W, the carrier power should be no more than 500/4 = 125 watts. You might need to keep it somewhat below that if you make long transmissions. Just as a point of interest, with sine-wave audio at 100% modulation, each sideband has 1/4 the carrier power, so even though the peak power is 4x the carrier, the total *average* RF power is only 1.5x. Alan N1AL On 2/27/19 6:20 PM, Mike Lichtman via Elecraft wrote: I know the KPA 500 is designed for SSB and CW, but I have always wondered if you can use a KPA500 on AM and, if so, what would be the maximum wattage you should use? The manual doesn’t say anything about it. 73 Mike KF6KXG __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA 500 - Can you use it on AM?
Mike, You can use the KPA500 on AM at the full 500 watt rating. BUT remember that the power is Peak to Peak. So you will not get 500 watts of carrier and a total of 500 watts of sideband energy. You will get 250 watts of carrier and 125 watts of sideband energy in each sideband - for a total of 500 watts PEP. If you are long-winded on AM, you should reduce the power - check the temperature. 73, Don W3FPR On 2/27/2019 9:20 PM, Mike Lichtman via Elecraft wrote: I know the KPA 500 is designed for SSB and CW, but I have always wondered if you can use a KPA500 on AM and, if so, what would be the maximum wattage you should use? The manual doesn’t say anything about it. 73 Mike KF6KXG __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
Re: [Elecraft] KPA 500 - Can you use it on AM?
No reason why not. If it were me, I’d keep the unmodulated carrier out to around 90-100 W to allow for some headroom. There’s no reason to push it past that. Grant NQ5T K3 #2091 KX3 #8342 > On Feb 27, 2019, at 9:20 PM, Mike Lichtman via Elecraft > wrote: > > I know the KPA 500 is designed for SSB and CW, but I have always wondered if > you can use a KPA500 on AM and, if so, what would be the maximum wattage you > should use? The manual > doesn’t say anything about it. 73 Mike KF6KXG > __ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html __ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
