[R-390] Re: EAC R-390 factory modification that incorporates USB/CW/LSB

[W. Li]

Fellows:

A few years back this issue was raised. I have scanned
the archives and came up with these msg's, that might
help you out finding the schematic.
.......................................
Date: Thu, 10 Jul 2003 23:24:49 -0700
From: David Ross <ross at hypertools.com>
Subject: Re: [R-390] SSB-Modified R-390A

Does this describe the LSB-USB-AM-CW mod for the
R-390A?

"Mounted on a small L-bracket chassis, it consisted of
circuitry featuring a 6U8 tube with two crystals and a
USB/LSB selector switch. The original BFO switch was
removed and the new assembly installed in it's place. 
A short cable fit into an 8-pin connector added near
the front of the IF deck for power and signal output. 
The front panel was refinished, repainted and silk
screened with new lettering for the USB/LSB switch"
  This is from the February 2003 issue of Electric
Radio, page 32, article titled "Dick Walser
Remembered".  Dick is apparently the fellow who came
up with this SSB mod.  The article mentions Dick's
company, Airborne Electronics and further states: "In
all, Airborne remanufactured about one thousand
R-390As.  A large number of them were shipped to radio
dealers in the (Los Angeles/North Hollywood) area. 
Not all of them went to the dealers.  Todd Shipyards
purchased ten radios that were to be installed in five
destroyer escorts being built in the 1970's, and in
the 1980's a mysterious Japanese entrepreneur
purchased twenty R-390A's for his well-heeled clients
in Tokyo.  Most of their rebuilt radios were shipped
to well-known 3-letter Government agencies.  Some were
shipped to countries in South America. R-390As that
were under contract to Columbia Electronics received a
new nameplate that reflected 'Columbia Electronics' as
the manufacturer."  Columbia Electronics does show up
as an R-390A manufacturer on an R-390A FAQ at: 
	http://www.r-390a.net/faq-manuf.htm
------------------------------
From: Llgpt1 at aol.com
Date: Sat, 19 Jul 2003 21:19:11 EDT
Subject: Re: [R-390] SSB Conversion Photos

That is basically the same conversion as pictured in
Paolo Viappiani's R-390 - R-390A Handbook. The
Schematic is printed in it also, schematic is in
English, noted as an EAC conversion.
---------------------------------------------------
From: "federico" <federico at dottorbaldi.it>
Date: Mon, 21 Jul 2003 22:04:17 +0100
Subject: [R-390] SSB Conversion Scheme

Hi to all friends, I succeed to put the scheme of SSB
EAC Mod, please follow the link :      
www.dottorbaldi.it/militaryradio            and there
you shall find the scheme and some photo of my shack. 
Let me know if there are any problem.
----------------------------------------------------------------------------
W. Li
Mercer Island, WA


       
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