Definitely the easiest solution ... it's easy to generate a quadrature with simple L-C networks at IF because the BFO frequency is more or less fixed or limited in range ... it's wideband LOs that need a digital divider quad generator
JR --- In [email protected], Bob Stewart <[EMAIL PROTECTED]> wrote: > > 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/
