Hi Frank, I would not expect the waterfalls for the JT modes to change because the JT modes transmit only one tone at a time. Apart from turning the tx on and off, the amplitude of the signal does not change. Therfore there is no source for IMD that could result in a broader signal or splatter. You could even use a class C amplifier like you could for a fm transmitter.
Greetings Ralf, DL6OAP Am 19.07.2013 um 00:55 schrieb Frank Precissi <vad...@gmail.com>: > I think the best solution would be to try it both ways and see what kind of > signal report you get. I'd be interested to see the two JT waterfalls > compared side by side. > > 73, > > Frank KG6EYC > > > On Thu, Jul 18, 2013 at 3:47 PM, Ron D'Eau Claire <r...@cobi.biz> wrote: > >> I think it's a good question, but I cannot answer it. >> >> Most amps produce more distortion the more power they run. >> >> The question is whether the sum of distortion from both amps at lower power >> is less than one amp running at higher power. >> >> 73, Ron AC7AC >> >> -----Original Message----- >> >> >> On 7/18/2013 3:08 PM, Chris Johnson wrote: >>> I love my KPA500. I don't use it enough because of all the low power >>> digital I do. I was wondering if the quality of my signal would >>> better if I let the KPA500 produce the output even if the wattage is >>> 50 or less watts. If I drive it with 1 to 5 watts, it produces 10 >>> to 50 watts. I like the thought of offloading the thermal load of >>> my long JT65 & JT9 duty cycles onto the KPA rather than my main rig >>> which is a Flex 6700. >> >> You're likely to stimulate more replies than the "Why is aeronautical VHF >> comm still AM?" did. :-) >> >> I don't know anything about a Flex <anything> but, all amplifiers have >> non-zero distortion figures. Putting two "in series" will add up at least >> some if not all of them. The amp in your Flex followed by the >> KPA500 will most likely produce a poorer signal quality than just your Flex >> for the same power output. >> >> Secondly, the KPA500 was designed to produce several hundred watts with a >> few tens of watts drive [500W on any band for me takes between 25 and >> 30 watts drive]. That's probably the optimum operating point. Driving it >> with 5 watts should produce somewhere in the 50+ watts output range. >> >> 73, >> >> Fred K6DGW >> - Northern California Contest Club >> - CU in the 2013 Cal QSO Party 5-6 Oct 2013 >> - www.cqp.org >> >> ______________________________________________________________ >> 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 >> > > > > -- > FHC #4224 | 30MDG #6370 | DMC #5698 > NAQCC #6554 | SKCC #10435 | FISTS #16155 > ______________________________________________________________ > 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
