[Elecraft] Re: K3, smd and spectral display

[Jean-Claude Abauzit]

 > I don't quite understand the X-tal frequency of 11 MHz. My impression is
 > that the Softrock needs a crystal which is 4 x the center frequency, i.e. in
 > the order of 4 x 8.215 MHz or 32.86 MHz for the K3. What am I missing here?
 > Sverre LA3ZA

The Xtal must be a fundamental Xtal, an overtone Xtal won't oscillate 
in the SoftRock. It would be difficult to find a fundamental Xtal for 
32.86 MHz. The technique used is 3rd harmonic sub-sampling (11 * 3) / 
4 = 8.25 MHz. You also have to reverse the I & Q going to the sound card.

Jean-Claude PJ2BVU 
-------------- next part --------------


No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.467 / Virus Database: 269.7.7/816 - Release Date: 5/23/2007 3:59 PM