[R-390] carrier meter

[DJED1@aol.com]

The meter is supposed to read in dB relative to 1 microvolt.  The curve in 
the manual (TM-856A) shows 10 microvolts at 20 dB, increasing 20 dB for every 
10X increase in voltage, up to 100,000 microvolts at 100 dB.  I haven't found 
it to be very linear in dB, and you can vary the scale substantially by 
setting the IF gain at different levels.  If set as intended, I usually 
assume "S9" is at the 40 dB mark.
Ed  WB2LHI