And with imports aside, we have big output distortion problems with some rigs built here in the USA.
It is scary to think what many hams would see if they ran a two-tone signal into their SSB transceivers at full power with a supply voltage of say 11.0 Vdc? Since the semi manufactures stopped making Bipolar RF Power transistors in the middle of the last decade, most Ham HF transceiver manufactures were forced into using inferior so-called 12 Volt MOSFETs in their finals. And as a result, have had great difficulty in meeting even minimal Intermodulation Distortion (IMD) standards. Since the disappearance of Bipolar RF power transistors, many HF transceivers from very reputable manufactures have terrible distortion problems and if the supply voltage is allowed to drop even a volt or two, they can end-up splattering all over the band. Unfortunately, many hams don't have a spectrum analyzer or even the ability to monitor a two-tone output signal so they don't know they have a problem while the poor guy down the street is getting stepped on. So in reality, the responsibility of a clean output signal begins at home with the manufacture! Particularly here in the USA. ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
