Hi Francis,
In the case of my KWM-2A, I'm just going to to use the
BFO oscillator output and a quadrature hybrid to form
the 90 degree signals. The circuitry will be
amazingly simple. Take a look at KK7B's Binaural I-Q
Receiver circuit in the handbook. The detector is in
a schematic by itself, and I think that's all you'll
need if you have a BFO signal in your radio. You can
get information on making quadrature hybrids here:
http://www.seboldt.net/k0jd/phase_notes.html I will
also note that the DDS daughterboard (don't have link)
is almost a perfect match, but they don't bring out
the Q signal from the DDS chip.
Bob - AE6RV
--- FRANCIS CARCIA <[EMAIL PROTECTED]> wrote:
> Bob,
> I'm planning one myself for an interface to my
> Racal RA6830 455 KHz IF. I also did the same tests
> as you so can't wait to have the real interface. I
> noticed the color burst crystal divided by 8 gives
> you an IF of 8.44 KHz into the sound card. Then I
> noticed my 3725 KHz novice 80 meter crystal would
> also work. The Soft Rock 40 has a spare flip flop so
> that will be the oscillator chain. I'm debating the
> value of the double balanced Tayloe mixer. WA1GFZ
>
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/soft_radio/
<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
