[R-390] General history on our website also updated

[Larry H]

I found a website that has a very nice write up about the history of the
R-390 and R-390A by *Luca Fusari*
<http://lucafusari.altervista.org/page9/AmericanRadio.html>.  There's a
link to it in the first entry of our 'history' section on our website,
r-390a.net.  Let me know what you think.

Regards, Larry