[R-390] R-390A sensitivity measurements

[DJED1 at aol.com]

I agree with John about not aligning the radio to the antenna- too much 
variation in impedance over the band.   I use an antenna tuner on my wire antenna 
and logged the settings for each frequency of interest using an MFJ antenna 
analyzer.   The tuner settings show a LOT of antenna impedance variation, 
especially below 4 MHz.   Of course, the radio is now looking into 50 ohms, but it's 
close enough for Guvm't work.   Certainly, for those of us in noisy suburban 
locations, a tuned antenna provides a high enough noise level that I don't 
worry about that last 0.5 dB of sensitivity.   That's what I did today- put the 
signal generators away and tuned up the radio to some interesting SWBC.
Ed