Here is a poor man's pulse stretcher. http://www.ko4bb.com/Test_Equipment/Thunderbolt/PulseStretching/
Probably not good enough for timing applications, but plenty good enough to see the pulse on an analog scope. Didier KO4BB Sent from my BlackBerry Wireless thingy while I do other things... -----Original Message----- From: "Bob Camp" <[email protected]> Sender: [email protected] Date: Wed, 11 Jan 2012 13:04:38 To: 'Discussion of precise time and frequency measurement'<[email protected]> Reply-To: Discussion of precise time and frequency measurement <[email protected]> Subject: Re: [time-nuts] FE-5680A arrived Hi To use the 1 pps with a normal (RS-232 based) NTP server, you would need a pulse stretcher. You probably could use it directly with one of the Soekris boards that take the pps straight into a GPIO pin. Bob -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Chris Albertson Sent: Wednesday, January 11, 2012 12:50 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] FE-5680A arrived On Wed, Jan 11, 2012 at 9:09 AM, Bob Camp <[email protected]> wrote: > Hi > > A good old logic probe can come in handy from time to time. They certainly > aren't very expensive. On my FE5680 I was convinced there was no PPS. My HP5328 counter could not find a pulse. All I saw was high frequency noise on the scope. And the spec listed pin-6 as "N/C". Then I thought to amplify and low pass filter and now the PPS shows up on the HP5328 with a 1000000.0 uS period. I think the PPS is there but needs a bit a signal conditioning to be useful. Fortunately my old Tek 465B scope has a low pass function and a vertical amplifier output BNC on the rear. I had to crank the amp up and attenuate it on the counter. Has anyone been able to put the PPS fronmthe FE5680 to practical use yet. For example sending it to a computer to drive an NTP server? Detecting it is one thing. reliable use 24x7 is another thing. Chris Albertson Redondo Beach, California _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
