Jim Lux wrote:
At 10:11 AM 1/4/2006, [EMAIL PROTECTED] wrote:
The SDR1000 can use clocks between 10MHz and 200MHz so long as when
multiplied by an integer it equals 200 MHz. I use a 10MHz TCXO.
73,
k2ox
However, when you multiply up using the internal VCO, the phase noise takes
a hit. You might wind up with poorer noise (but more accurate frequency)
multiplying up from a 10 MHz TCXO.
http://www.febo.com/geekworks/sdr1k/sdr1k_phase/index.html has
screenshots that show the phase noise at the output of the DDS for the
standard 200MHz oscillator, and an HP Rubidium frequency standard at
10MHz multiplied by 20 in the DDS. You can clearly see the phase-noise
hit caused by the multiplication.
John
