[R-390] SSB for the R-390A

[Bob Camp]

Hi

Pictures got stripped off somewhere along the way.

One of the gotcha’s with SSB on the 390 is the way the filters are set up. USB isn’t the same for any two filters. These days a cheap little DDS chip would take care of that pretty quick. With crystals, you have a lot of them to cover every combination (some of which admittedly aren’t much use …).  Fixed injection frequencies do make things a bit easier no matter how you do it ….

Bob

On Feb 12, 2014, at 7:02 PM, Pete Williams <jupete at internode.on.net> wrote:

>   Feeling  a bit  adventurous  after  adding the  Treetops Circuits  SSB
> module  to my  R-390A  I felt that  using the   pair of  BFO
> xtals  I had would be a useful addition for  selecting  either  sideband as
> well as using the  inbuilt  BFO in the
> receiver.
> The  accompanying photos  and  circuit  description  -in the  pdf  tells
> the  story of  adding the  switchable  xtal  and
> interconnections. Non of the  alterations involve major  circuit  changes
> and  completely reversible.
> 
> I'm happy to  supply  any words of  encouragement and /or clarification as
> required.
> 
> Pete  VK3IZ
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