[Elecraft] [K3] RX Gain Calibration

[Edward R Cole]

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