[Boatanchors] DDS VFO

[Ed - K9EW]

Hi Lee,

I'm not sure if this is what you're looking for, but I have been using
an FCC-1/2 as a DDS VFO for several of my BA rigs for the past couple
of years.  The only thing I had to add was a transformer to get the
higher voltage needed by the Oscillator tube.  I've used this with a
DX-60B, CE-20A, and an Adventurer.  It sure is nice to set the
frequency and not hear any drift.  The transformer is 16 turns of #28
(not critical) bifilar, on a T68-6 core.  The two wires are connected
as follows: wire 1-A (to FCC-1/2), wire 1-B (to ground), wire 2-A (to
BA), wire 2-B (to ground).  I programmed an offset into the FCC-1/2 so
that it isn't in the way during the Receive Mode.  When I go into the
Transmit Mode, the FCC-1/2 is right on the desired frequency.  Note
that this requires an additional switch to put the FCC-1/2 into the
Transmit Mode.  I've used a footswitch, or another set of contacts
that close in the Transmit Mode.  You can also key the FCC-1/2, but
that got kinda complicated.  A Spot Switch is used for tuning the
FCC-1/2 to match the received signal's frequency.

Hope this helps.

73,
ed - k9ew
www.k9ew.us

On Wed, Apr 29, 2009 at 11:11 AM, Lee Buller <k0wa at swbell.net> wrote:
>
> Is anyone out there developed a DDS VFO for use with BA Tranmitters and Receivers?
>
> Lee - K0WA
>
>
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