[R-390] Unusual ? Front panel

[Gordon]

Tom,
   Since I don't read Italian, is there an English version that shows 
the modified Circuit for the add-on to the IF Module?

Thanks,
Gordon
N6WK


On 6/13/2013 6:08 PM, Tom Bridgers wrote:
>
>
> These panels are the result of Columbia Electronics work in
> updating and restoring R-390A's for certain 3-letter  US govt.
> agencies and for a few Latin American countries.  I have
> several of the Columbia Electronics nameplates that I
> purchased from Dick Walser who was the prime sub-
> contractor doing the work..
>   
> He and his business partner designed the module that is an
> add on to the IF deck which produces the capability to switch
> from Lower SSB and Upper SSB.  Somewhere in my files, I
> have a circuit drawn by Dick, but it is also available in PaoloViappani's book, R-390-URR - R390a-URR handbook.The book, written in Italian,  appears to be available from: Amazon.co.uk.
>   
> I also have one of the panels designed by Dick with the
> nomenclature you describe.
>   
> Dick Walser, in North Hollywood, CA, was the subcontractor
> in that work.  His company was named Airborne Electronics.
>   
> I visited Dick about 15 years ago, and spent a delightful two
> days with he and his lovely wife, Dede, talking about the old days and looking over his incredible collection of R-390A parts.
>   
> Until his death about 5 years later,  I was one the phone with
> Dick several times a month seeking his advice on this or that
> problem I was having trying to restore a R-390A.  He had an
> encyclopedic knowledge of the R-390 and R-390A, and was a genuine pleasure to have a conversation with.
>   
> Another person on this list had the great fortune of purchasing all
> of Dick's parts, most of which unfortunately were lost in a shipping
> disaster when they were shipped to his new home in Texas.
> Best,
> -Tom
>
>   
>> Date: Thu, 13 Jun 2013 18:46:37 -0400
>> From: k2cby at optonline.net
>> To: R-390 at Mailman.qth.net
>> Subject: [R-390] Unusual ? Front panel
>>
>> What R-390A version/contract had the words "UPPER"  "BFO"  "LOWER"
>> stenciled where the BFO frequency normally appears and the words "AM"  "CW -
>> SSB" stenciled where "BFO OFF-ON" normally appears on the front panel? Was
>> this an "after-market" conversion? Who were these units sold to? Foreign?
>> Spookdom? How many were produced? Does it indicate that the BFO was
>> crystal-controlled? Was there a product detector included? Has anybody got a
>> print?
>>
>>   
>>
>> Miles B. Anderson, K2CBY
>> 16 Round Pond Lane
>> Sag Harbor, NY 11963
>> Tel.: (631) 725-4400
>>
>> Fax.: (631) 725-2223
>> e-mail: k2cby at optonline.net
>>
>>   
>>
>>
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