Said- I do not have any specific phase noise numbers to offer, but the spectral output is:
5MHz -54dBc 10MHz 0dBc 15MHz -65dBc 20MHz -58dBc 25MHz >-70dBc 30MHz -60dBc My application uses the 10MHz output to drive a homebrew direct frequency synthesizer with output in the VHF range, so >-50dBc was sufficient for me. The design goal of the final RF signal was a phase locked RF carrier on 241GHz. With a requirement for short-term stability of a few parts in 10^13 for very narrow band weak signal signal detection. In short, an amateur radio contact was made over a 79km path on 241GHz while using a pair of radios whose freq reference was an ultra-low phase noise 5MHz OCXO on each end. The phase noise of the RF system was good enough to allow a 0.67Hz filter to be used in the RX chain and the 5MHz oscillator was specified as such. Even without directly measuring the phase noise degredation of the multiplier, based on the result at 241GHz it cannot be much more worse than 20Log(n), or 6dB in this case. -Brian, WA1ZMS -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of [EMAIL PROTECTED] Sent: Thursday, October 26, 2006 7:05 PM To: [email protected] Subject: Re: [time-nuts] 5 MHz Frequency Doubler Hello Brian, nice circuit. Would you have phase noise info, and harmonic/ sub-harmonic measurements for it? Thanks, Said _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
