Re: [time-nuts] Bye-Bye Crystals

2017-03-13 Thread David Armstrong
I work for a company that builds electronics products, low volume, highly complex units. It used to be that you bought a crystal and then made an oscillator that would use that crystal. Or you had a single chip micro that used a crystal for the time base, in the early days you might have to

Re: [time-nuts] lightweight webserver for, e.g., NTP widget

2013-02-11 Thread David Armstrong
There are numberous web servers that are small and light weight, some examples are boa ( www.boa.org ) and HTTPd http://www.nongnu.org/mini-httpd/ On Mon, 2013-02-11 at 14:01 -0800, Jim Lux wrote: I'm intrigued by the possibility of using a lightweight web server to provide a management/user

Re: [time-nuts] WWVB PSK demodulation; simple carrier regeneration?

2012-11-20 Thread David Armstrong
Hi, I am have thinking / tinkering / planning a wwvb receiver for longer than I am willing to admit!! It seems to me that one could take a ferrite loop, JFET buffer, ADC and a small microprocessor to get down to baseband - say 20 Hz complex sampling rate - and then output on a serial port

[time-nuts] SimpleLink CC44000 GPS Development Kit

2012-03-28 Thread David Armstrong
It appears that TI has entered the GPS market. I don't know if this would make a good start on a GPSDO or not? Comments? https://estore.ti.com/SimpleLink-CC44000-GPS-Development-Kit-P2945C159.aspx ___ time-nuts mailing list -- time-nuts@febo.com

Re: [time-nuts] new CSAC

2011-09-20 Thread David Armstrong
10.24 MHz is used in cable modem systems both North American and Europe DOCSIS specs from cablelabs specify the downstream symbol rates. For NA there are two symbol rates 401/812 * 10.24 MHz and 78/149*10.24 MHz. For everyone else 869/1280*10.24 MHz. On Tue, 2011-09-20 at 17:28 +0200,

Re: [time-nuts] Frequency multiplication

2011-02-02 Thread David Armstrong
FPGA's do not have good jitter performance. Both Altera and Xilinx have app notes and specs on what to expect for jitter performance. Particularly when using high speed DACs (like the ADI AD9739) the technique used is to drive the DAC with a good quality clock, then the DAC drives the FPGA.

[time-nuts] HP 105B

2006-09-28 Thread David Armstrong
I have been lurking in the background for quite some time now, very interested in what is going on. Now I have a reason to post ;-) I have recently acquired an HP 105 B crystal oscillator and am looking for a manual for the thing, can anyone help? Regards Dave Armstrong begin:vcard fn:David