[R-390] R-390A dB meter as as "S" meter

[frankshughes at aim.com]

Hi,
I will soon embark on my first HAM communication! (goal=2010) 
- license = General, KJ4OLL
- receiver = R-390A & Alpha-Delta DX-Ultra
- transmitter = Collins 32S-3

- still looking for a microphone, transmit antenna, SWR meter/tuner

I have been listening to the bands for almost a year to learn, and just realized that
there is no meter to provide a signal report.  
5/9 on an R-390A dB meter?

Where is the "S" meter on this critter anyhow;)

Is there any way to equate R-390A dB readings to numeric values on an S-Meter?

I guess if the R-390A dB meter peaks over 50% and copy is clear to my ancient auditory ossicles,
I'll just say 5/9, rather than try to explain that I like using boatanchors......

73 and Happy Thanksgiving!
Frank
KJ4OLL