CW also requires a highly stable ALC system, without unwanted dynamics, to preserve ideal envelope shaping. This is lacking on some all-mode rigs that pay little attention to CW.
Wayne N6KR On Jul 26, 2015, at 9:32 PM, Alan <[email protected]> wrote: > > > CW would be another mode that would not need a linear amp I think. > > No, CW requires a linear amplifier. CW is not constant-amplitude - the > amplitude changes every time you open or close the key. A class-C amplifier > would mess up the key shaping, causing key clicks. > > Any true FSK or MSK signal should not be bothered by a non-linear amplifier. > The only caveat I can think of is that the amplitude of an AFSK signal may > have some ripple on it to the extent that the passband of the transmit > crystal filter is not flat. But I doubt that's a significant issue. > > Alan N1AL > > > > On 07/26/2015 06:57 PM, Tom Azlin W7SUA wrote: >> Hi Don and Alan, >> >> I was thinking one of the slow multi tone FSK modes that are a single >> tone at a time. WSQ is in the same class. >> >> http://www.qsl.net/zl1bpu/SOFT/WSQ.htm >> >> CW would be another mode that would not need a linear amp I think. >> >> On the other hand PSK31 would require a linear amp. >> >> 73, tom w7sua >> >> On 7/26/2015 5:43 PM, Alan wrote: >>> On 07/26/2015 05:32 PM, Don Wilhelm wrote: >>> >>>> Soundcard sourced digital modes are really SSB signals and need a linear >>>> amplifier. >>> >>> The one exception might be FSK. It is constant-amplitude so a class C >>> amplifier should be fine. >>> >>> FSK modes include RTTY and I believe WSPR and WSJT. >>> >>> Alan N1AL >>> ______________________________________________________________ >>> Elecraft mailing list >>> Home: http://mailman.qth.net/mailman/listinfo/elecraft >>> Help: http://mailman.qth.net/mmfaq.htm >>> Post: mailto:[email protected] >>> >>> This list hosted by: http://www.qsl.net >>> Please help support this email list: http://www.qsl.net/donate.html >>> Message delivered to [email protected] >>> >>> >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [email protected] >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
