The schematic on page 25 of the XG3 manual shows that U1 is a CS2100, which I assume is a Cirrus Logic CS2100-CP (the one with I2C). The datasheet says (as I understand it) that the output frequency from the chip is 6 to 75 MHz (pin 3).
The Elecraft specs say the unit outputs 1.5 MHz to 200 MHz (with harmonics also usable up to 1.4 GHz). So I'm trying to square the CS2100 datasheet with the manual, at least as I understand them both. Specifically: 1. How does the XG3 operate below 6 MHz? 2. How does the XG3 operate above 75 MHz? And even more specifically: 3. If the XG3 is set to 144 MHz, is the resulting square wave 144 MHz, or a subharmonic? I'd also be very curious to know if anybody's measured the phase noise at different distances from the carrier. The manual indicates -105 dBc/Hz, but doesn't say how far this is from the carrier. A plot would be very interesting. Todd, AE3K ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
