[R-390] SSB R390A on eBay

[Barry]

I think the labeling is understandable.  Whoever did this substituted a
4-position switch and added LSB and BFO to the left and right of the
existing lettering (perhaps because it is an engraved panel?).  I would
guess that "LSB" is just that, "ON" is USB and "BFO" is "regular" bfo
operation.

Just a guess, though.  Either way, it's too rich for my blood.

Barry - N4BUQ

----- Original Message -----
From: "Dennis Wade" <sacramento.cyclist at gmail.com>
To: "Cecil Acuff" <chacuff at cableone.net>
Cc: <r-390 at mailman.qth.net>
Sent: Saturday, March 18, 2006 11:53 AM
Subject: Re: [R-390] SSB R390A on eBay


Well I missed that connector on the front of the IF deck.  Now I think
its pretty likely there is a product detector mod somewhere in that
radio.

That BFO switch labeling still throws me however.  Odd.

As far as a schematic Cecil...there is a discussion (in Italian) and a
diagram in the book written by a gentleman whose name escapes me at
the moment (also Italian).  Someone was kind enough to copy the
diagram and send it to me.  I will see if I can scan it into a PDF and
send it to you.

       Dennis

On 3/18/06, Cecil Acuff <chacuff at cableone.net> wrote:
> If it's not factory who ever did it did a pretty good job.  Used a PTO
type
> connector to interface with the IF deck as seen in one of the photos
showing
> that area.  I would guess that's not a 3TF7 in the socket to the right of
it
> either....
>
> Is the schematic of the factory mod documented anywhere?  I wouldn't mind
> taking a look at what was done.
>
> Cecil....
> ----- Original Message -----
> From: "Dennis Wade" <sacramento.cyclist at gmail.com>
> To: <r-390 at mailman.qth.net>
> Sent: Saturday, March 18, 2006 11:06 AM
> Subject: Re: [R-390] SSB R390A on eBay
>
>
> Something strikes me odd here about the mod...I don't think its
> original or factory.
>
> Why would the BFO switch be labeled "LSB OFF ON BFO"?   Strange..did
> they decide to crystal control/fix the LSB side but let the operator
> hunt for the USB side?
>
> I think this is a fixed (sorta) frequency BFO mod..not necessarily a
> SSB mod.  For it to be a SSB mod it needs to have (IMHO) the extra
> module between the front panel and audio deck with a 6U8 or 6EA8
> product detector (or modern equivalent of course), and the associated
> switching to preserve the AM/CW modes.  My Motorola has this extra
> module.  The pics don't give a clear view so I can't say for sure, but
> I think we just have a BFO mod here.
>
> Chuck Rippel says the extra module is quite rare...I've seen/heard of
> a few...I don't have a feel for how rare they actually are.  Comments?
>
> Seems to be in reasonable physical shape though.
>
>           Dennis
>
> On 3/17/06, Barry <n4buq at knology.net> wrote:
> > 5880089680
> >
> > Barry - N4BUQ
> >
> > ----- Original Message -----
> > From: "Francesco Ledda" <frledda at verizon.net>
> > To: <DJED1 at aol.com>; <n4buq at knology.net>; <r-390 at mailman.qth.net>
> > Sent: Friday, March 17, 2006 4:32 PM
> > Subject: RE: [R-390] SSB R390A on eBay
> >
> >
> > > What is the e*** number?
> > >
> > > -----Original Message-----
> > > From: r-390-bounces at mailman.qth.net
> > [mailto:r-390-bounces at mailman.qth.net]On
> > > Behalf Of DJED1 at aol.com
> > > Sent: Friday, March 17, 2006 4:01 PM
> > > To: n4buq at knology.net; r-390 at mailman.qth.net
> > > Subject: Re: [R-390] SSB R390A on eBay
> > >
> > >
> > > I did notice it- I thought it was strange that the sideband selector
> > > only
> > > has USB and not LSB.  I assumed it was homebrew, but I could be
wrong.
> > > Ed
> > > _____________________________________________________________
> > > R-390 mailing list
> > > Home: http://mailman.qth.net/mailman/listinfo/r-390
> > > Help: http://mailman.qth.net/faq.htm
> > > Post: mailto:R-390 at mailman.qth.net
> > > Unsubscribe: http://mailman.qth.net/mailman/options/r-390
> > > --
> > > Internal Virus Database is out-of-date.
> > > Checked by AVG Free Edition.
> > > Version: 7.1.375 / Virus Database: 268.2.1/279 - Release Date:
3/10/2006
> > >
> > > --
> > > Internal Virus Database is out-of-date.
> > > Checked by AVG Free Edition.
> > > Version: 7.1.375 / Virus Database: 268.2.1/279 - Release Date:
3/10/2006
> > >
> > >
> >
> > _____________________________________________________________
> > R-390 mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/r-390
> > Help: http://mailman.qth.net/faq.htm
> > Post: mailto:R-390 at mailman.qth.net
> > Unsubscribe: http://mailman.qth.net/mailman/options/r-390
> >
>
>
> --
> Dennis L. Wade
> KG6ZI
> Carmichael, CA
> _____________________________________________________________
> R-390 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/r-390
> Help: http://mailman.qth.net/faq.htm
> Post: mailto:R-390 at mailman.qth.net
> Unsubscribe: http://mailman.qth.net/mailman/options/r-390
>
>
>


--
Dennis L. Wade
KG6ZI
Carmichael, CA
_____________________________________________________________
R-390 mailing list
Home: http://mailman.qth.net/mailman/listinfo/r-390
Help: http://mailman.qth.net/faq.htm
Post: mailto:R-390 at mailman.qth.net
Unsubscribe: http://mailman.qth.net/mailman/options/r-390