This discussion prompts me to make the comparisons on my K3 (4340)
and KX3 (475). I have an XG3 which I have installed in a diecast
aluminum box (Hammond Box) so it is able to produce signals down to
-155 dBm using external attenuators and double-shielded coax cables.
I calibrate the XG3 at 0-dBm with my mw power meter (HP432A) and it
is within a dB accurate. Above 200-MHz harmonics are used so one
cannot measure output without using a bw filter, since the
fundamental freq and harmonics add to total power.
One should note measurements with preamp on/off and what bandwidth
they are made. I believe all Elecraft specs are made at 500-KHz bw.
May be a few days until I get the results to post, but I love both
these radios for their differences, as well.
73, Ed - KL7UW
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