Examples of "14V" radios using RD100HHF1 final transistors and delivering good & stable results:
ANAN 100,200 & 7000 series (w/o PureSignal) (3rd order IMD -30 dBc average (-36dB referred to one tone)); see AB4OJs test Kenwood TS 890S (3rd order IMD -32 dBc (-38 dB referred to one tone)) YAESU and ICOM are running the same transistors in some of their models. I am not promoting any brand but it is nothing "magic" or "bad" with MOSFETS being used at 14 V. Sure their advantage of having even better IMD characteristics at higher voltages cannot be used in a 14 V system. Roger/DL5RBW -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of ab2tc Sent: Sunday, January 06, 2019 1:42 AM To: [email protected] Subject: Re: [Elecraft] K3 power amp 2SC2782 Hi Wes, Agreed. In my view FETs are a mistake at the 14V level. The old K3 bipolar PA is much better (but still not good). Knut - AB2TC Wes Stewart-2 wrote > I have not observed a low power issue in my K3. OTOH, in my experience > the K3S PA has been a huge disappointment. One reason for buying a K3S > was a hope that the TX IMD would be improved with FETs. This would no > doubt have been true if Elecraft designed the radio for 50 VDC. > > Wes N7WS > > On 1/5/2019 3:16 PM, K9MA wrote: >> I've always felt that the KPA3 in my K3 was marginal. For example, >> I've never > <snip> -- Sent from: http://elecraft.365791.n2.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] ______________________________________________________________ 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]
