[R-390] Best approach for SSB mod on R-390A

[Dan Merz]

Hi,  I would ask myself which of these detectors has any gain control built
into it so you're not fussing with the rf control manually on strong
signals.  As far as I was concerned,  this was the main reason for going
beyond the 2-diode approach.  I'm pretty sure the Skirrow kit doesn't ,  and
looking at the SE-3 and PD-2  I see no specification that addresses this
issue so I assume they don't either.  Maybe someone with experience with
these latter two detectors could clarify that point.  But if  fussing with
the rf gain manually doesn't bother you,  then take your pick for all the
other features offered,  or just stick with the 2-diode fix.  The outboard
detector that Ed mentioned and the one that I built provide a line back to
the agc for gain control based on level at the detector and use a product
detector.   Dan. 

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Cecil Acuff
Sent: Tuesday, December 22, 2009 7:01 AM
To: Tom Frobase; R-390 at mailman.qth.net
Subject: Re: [R-390] Best approach for SSB mod on R-390A

Top of the heap....Sherwood SE-3.  Treat yourself...

www.sherweng.com

Next in line....PD-2

http://electronicspecialtyproducts.com/

Also there was a VE making a kit...Jan Skirrow, think he was a member here
for quite some time.  External Syncro/product detector.  Worked real well as
I understand.

http://skirrow.org/Boatanchors/TechTalk10.pdf

Then there are the various mods you've read about that utilize the BFO to do
SSB that are slight improvements on just using the radio as is.

You will no doubt get many emails telling you it works fine just like it
is...and in a fashion it does...it you desensitize the radio by backing down
on the RF gain and what not...

It works but really...the radio was never designed to do SSB.

There are also a few product detector mods which are probably worth looking
into further.  Problem is they are radio specific.  You mod that radio and
that radio alone works...but if you have several radio's the external
approach is a better choice.  (SE-3 or PD-2)

Just my opinion though...

Merry Christmas and Happy New Years to the group!

Cecil Acuff
K5DL
----- Original Message -----
From: "Tom Frobase" <tfrobase at gmail.com>
To: <R-390 at mailman.qth.net>
Sent: Monday, December 21, 2009 7:20 PM
Subject: [R-390] Best approach for SSB mod on R-390A


> What is the suggested approach for SSB modification for the R-390A.
>
> Is the 2 diode modification worth attempting?   I know it has been
> covered here more than once just wanted to solicit the current thinking
> on the matter ... thank you ... tom, N3LLL
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