Predistorsion properties are impressive. The following presentation http://users.burlingtontelecom.net/[email protected]/images/Eastern_VHF_UHF_Conf_2014.pdf
gives some information what is possible. In LDMOS amp with bias almost reduced to 0, IMD3/5 change from -22/-28db to -55/-63db. Also a crappy 13.8V CB amp with IMD3/5 of -18/-28 becomes -47/-53 after predistortion. Class AB amps have an efficiency of around 50%. B class amps (also in drivers) perhaps can raise it to 70%. 40% less input current and 55% less dissipation, all at excellent IMD. All for nothing, oops, for lots of programming if DSP is powerful enough. Perhaps in 10 years nearly all new rigs will have predistortion implemented. Probably K3/KX3 do not have powerful enough DSP to do it. For example, the biggest limit in KX3 on SSB is speech processor that is currently just a treble boost. 6db lost. The fact that it is not done means that it cannot be done easily. Ignacy, NO9E -- View this message in context: http://elecraft.365791.n2.nabble.com/PA-with-predistortion-tp7584706p7591098.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ 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]
