Re: [time-nuts] Si5351A
The specs for period, cycle-to-cycle and phase jitter are on page 6 of the data sheet, which is here: http://www.adafruit.com/datasheets/Si5351.pdf Wayne On Tue, Nov 11, 2014 at 12:49 PM, Joseph Gray jg...@zianet.com wrote: Some of you have probably already heard of this new clock generator chip from Si. News of a board with this chip from Adafruit just came up on a local Amateur list today. A quick Google shows that some folks have used this chip in homebrew SSB rigs. My concern would be that when this chip generated frequencies that required non-integer PLL ratios, that the jitter would be unacceptable for SSB use, and even worse for CW. As for the Adafruit board, they are using a crystal spec'ed for 30ppm accuracy and stability. Not something I'd want to use in a radio. Perhaps the C version of the chip, fed by a TCXO. What do you think about the jitter issue? Joe Gray W5JG ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Si5351A
Hi When you look at the parts some people use in radios, this one is better than some of them. No, it’s not what I would use. Bob On Nov 11, 2014, at 3:49 PM, Joseph Gray jg...@zianet.com wrote: Some of you have probably already heard of this new clock generator chip from Si. News of a board with this chip from Adafruit just came up on a local Amateur list today. A quick Google shows that some folks have used this chip in homebrew SSB rigs. My concern would be that when this chip generated frequencies that required non-integer PLL ratios, that the jitter would be unacceptable for SSB use, and even worse for CW. As for the Adafruit board, they are using a crystal spec'ed for 30ppm accuracy and stability. Not something I'd want to use in a radio. Perhaps the C version of the chip, fed by a TCXO. What do you think about the jitter issue? Joe Gray W5JG ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Si5351A
John Miles did the phase noise measurments, they are avaible here: http://nt7s.com/2014/11/si5351a-investigations-part-7/ BR Thomas. 2014-11-11 21:49 GMT+01:00 Joseph Gray jg...@zianet.com: Some of you have probably already heard of this new clock generator chip from Si. News of a board with this chip from Adafruit just came up on a local Amateur list today. A quick Google shows that some folks have used this chip in homebrew SSB rigs. My concern would be that when this chip generated frequencies that required non-integer PLL ratios, that the jitter would be unacceptable for SSB use, and even worse for CW. As for the Adafruit board, they are using a crystal spec'ed for 30ppm accuracy and stability. Not something I'd want to use in a radio. Perhaps the C version of the chip, fed by a TCXO. What do you think about the jitter issue? Joe Gray W5JG ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- Please avoid sending me Word or PowerPoint attachments. See http://www.gnu.org/philosophy/no-word-attachments.html PDF is an better alternative and there are always LaTeX! ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
