[Elecraft] KX3 oscillator temperature

[Fred Townsend]

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 <on4iq at telenet.be>
>Sent: Aug 20, 2014 11:50 AM
>To: elecraft at mailman.qth.net
>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
>
>
>
>
>--
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