[Elecraft] KX3-2M module?

[David Anderson]

I wouldn't be doing that for a couple reasons Stewart. I was advised not to by Elecraft in previous discussions.

1.Wideband transmitted Noise. Under driving the radio PA stageswhile they still have the same gain means that the S/N of the transmitted signal is reduced considerably, a bad thing especially if a high power amplifier is planned on the VHF and above bands where band noise is low and transmitter wideband noise will be heard over a wide area.

2. There are some gotchas with the KX3 and setting the output to a low value in the transverter menus. I have mentioned these before, but the ATU Tune button is dangerous as it will put out a lot more power than what is set in the transverter power setting in the settings! Danger Will Robinson! 

So, the only sensible and safe way to wire into an external transverter is to use normal HF power output and attenuate with a power attenuator it before the input of the transverter, wasteful in power and heat, but...

So aftermarket KX3 PA heatsink and copper heatspreader for SI570 and extra calibration for VFO temperature may be essential for the highest frequency stability.

73

David Anderson GM4JJJ



> On 9 Apr 2014, at 08:24, "Stewart at g3ysx.org.uk" <stewart at g3ysx.org.uk> wrote:
> 
> When driving a transverter presumably you will be running at 0dbm rather than at 5W. I wonder if the KX3 still experience thermal drift due to PA heating at very low power?
> 
> Stewart/G3YSX
> Sent from my iPad
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