At 03:40 PM 6/30/2007, you wrote:
>Thanks for all the good info Cecil. Those AD9834 parts may have less
>of a spur problem since they are such low power. That's also the
>part the FCC-1 / FCC-2 use which is nice because with a x4
>ICS501/601 up and a /4 QSD down you see the correct LO frequency in
>With a 50% duty cycle and a CLK and /CLK output from the ICS601 and
>2 FFs you have all the quadrature clocks needed.
>How about another possibility of getting a really good high
>frequency low jitter Osc (like the Valpey Fisher VP161) at 128Mhz
>and add a programmable/selectable divider. These SDR radios can be
>easily "block tuned" in 10Khz/5Khz/1Khz, etc increments, whatever
>you pick ....it doesn't have to be 1Hz at all. Are there any divices
>like that out there. All I see is those using PLLs like the ADF4001
>73 Kees K5BCQ
It's called a Fractional N Synthesizer which I mentioned I wanted to
experiment with using a 1GHz clock. I need to workout the math but
20KHz or so would be small enough steps, let the Software do the fine tuning.
www.softrockradio.org www.qrpradio.com www.hpsdr.com
"Blessed are the cracked, for they shall let in the light."