Johan: We know the higher the frequency the less efficient the amplifier /oscillator so what I think you are seeing is the effect of self heating. 3 degrees c seems like a reasonable number. I think you will see even more heating in transmit. That's why an oscillator with a low temperature coefficient is important.
73 Fred, AE6QL -----Original Message----- >From: on4iq <[email protected]> >Sent: Aug 20, 2014 11:50 AM >To: [email protected] >Subject: [Elecraft] KX3 oscillator temperature > >I recently started extensive temperature testing on the KX3 to get more data >on dissipation and stability. >For starters stability in RX. KX3 in original setup. Serial below #2000 >I noticed that for a steady ambient temperature the oscillator temperature >varies with frequency used. >Has anyone else similar observations? Temp taken after long (2h) warm up >For example: >50MHz: 39°C >28MHz: 37°C > 7MHz: 36°C > >PA in RX remains 28°C >Any feedback is welcome. >73 Johan > > > > >-- >View this message in context: >http://elecraft.365791.n2.nabble.com/KX3-oscillator-temperature-tp7592410.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] ______________________________________________________________ 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]
