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Hello,
I have been beating my head trying to figure out why the MDS on my K3 (serial 2002) was so poor. I've been using the receiver sensitivity test plan from the Elecraft XG2 RECEIVER TEST OSCILLATOR, and getting a (preamp ON) MDS of -123dBm.
Tonight I decided to run this to ground to see why If could figure out why my radio's performance was so poor. After checking the obvious things like the XG2, cable, and power supply, I decided to look at the speaker terminal voltage on an oscilloscope. During the tests I had both AF and RF gain at maximum. What I discovered is that the speaker signal actually clips at that gain level. I backed off the AF gain until I got a nice looking sine-wave, and recalculated the MDS. -134.5dBm -- as advertised.
I thought this might be of interest of others who might be testing their unit's receiver sensitivity.
Rob
K6RFH
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