[R-390] SSB-Modified R-390A - factory or not ?

Thu, 10 Jul 2003 21:44:29 -0700 (PDT)

I recently aquired a National HRO-Senior, it has 'factory' installed a minature tube for the
Oscillator, and a Collins filter (2.1kHz)in place of the 1st IF can. It is so neatly done,
soldering, components, mounting etc. if it wasn't factory it sure does look as good as.

Very good on CW/SSB but too narrow for BC listening. Am looking to 'retro' the original IF can
back in, anyone out there with a HRO IF can, T2 to be exact. Circuit is pretty simple, maybe a
change over switch Collins Mechanical Filter / IF filter.

Rodney
VK2KTZ

--- federico <[email protected]> wrote:
> Hi Jim and friends,
>                    very interesting. I agree with you that a MOD done (well 
> done) by factory or from Army Lab can add value to the receiver in the same 
> way of some strange contracts (for example I have a 51J-4 manufactured from 
> Collins for Yougoslavian Press Agency TANJUG silkscreened in yougoslavian 
> language). Can you put on the web (or send by mail) a photo of your R-
> 390A/URR for a better evaluatiun.
> 
> 73 de Federico IZ1FID
> 
>  
> On Thu, 10 Jul 2003 08:30:40 -0400, Jim DiMauro wrote
> > Hi All:
> > 
> > I have a Collins-made R-390A S/N 756 from the very first contract
> > 
> > (14214-PH-51).  It was modified to add SSB capability.  The BFO 
> > switch was changed from the "Off-On" to "LO-UP-AM-BFO" and the dial 
> > lock was removed and replaced with a "VFO Vernier" control.  The mod 
> > was very nicely done and works well, with screened lettering on the 
> > front panel, and there are no immediately obvious circuit additions 
> > from looking at the top of the chassis.  I don't know exactly what 
> > type of mod was done, but it's certainly not a typical hack job 
> > normally assosciated with military radio conversions by amateurs.
> > 
> > I have three questions: where can I find a list and descriptions of known
> > SSB
> > conversions for the '390A so I can identify the mod?  Also, were 
> > there commercial conversions done by/for the government?  This radio 
> > came from an estate which included equipment from a US Army 
> > experimental SSB station AN/GRC-108 XC-1, so perhaps this radio was 
> > modified for the Army and not by a ham. Finally, does a 
> > "professional" SSB conversion add to or lessen the radio's value?  I 
> > guess it depends on the type of mod and who did it, but some 
> > thoughts along those lines would be appreciated.
> > 
> > Thanx & 73,
> > Jim
> > WA2MER
> > 
> > _______________________________________________
> > R-390 mailing list
> > [email protected]
> > http://mailman.qth.net/mailman/listinfo/r-390
> 
> 
> 
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