Both Adam and I measure the same spurs. Rob, NC0B -----Original Message----- From: time-nuts [mailto:[email protected]] On Behalf Of Graham / KE9H Sent: Saturday, February 27, 2016 2:08 PM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Inside a CTS 1960017 OCXO
Rob: Are you sure you were running it with a clean power supply? Any 60 Hz ripple on the supply could show up as AM/PM modulation. You might want to try another 5V power supply before you give up on the oscillator. --- Graham On Sat, Feb 27, 2016 at 11:35 AM, Rob Sherwood. <[email protected]> wrote: > Hi Dan, > > I purchased two of these, and VA7OJ one. One of mine is defective, > and the seller is going to replace it. What was disappointing was all > the spurious at 60 Hz intervals relatively close-in to the 10 MHz > carrier. I suppose if all one wants is a reasonably accurate 10 MHz, > then they work OK. My good one and Adam's unit were 1x10^7 low in > frequency once warmed up, and there are pins for frequency adjustment > and sync to another standard. However if one wanted it for an > oscillator with good close-in phase noise, the spurs ruin that hope. > > Do you know if there is a chopper at 60 Hz that runs the proportional > oven that is the source of all the spurious? > > Rob > NC0B > > -----Original Message----- > From: time-nuts [mailto:[email protected]] On Behalf Of > Daniel Watson > Sent: Saturday, February 27, 2016 9:48 AM > To: [email protected] > Subject: [time-nuts] Inside a CTS 1960017 OCXO > > > > Hi, > > I'm sure many of you are tracking the cheap CTS 10MHz OCXOs available > on eBay right now. I purchased a case of them, and decided to crack one open. > I took pictures along the way, thinking that might be interesting to > the list. Here is the blog post if you are interested: > > > http://syncchannel.blogspot.com/2016/02/10mhz-ocxo-teardown-cts-196001 > 7.html > > Comments on the internal construction of the OCXO are welcome. It > seems pretty straightforward inside though. > > > Best regards, > > Dan W. > _______________________________________________ > 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. > > > > -- > If this email is spam, report it to > > https://support.onlymyemail.com/view/report_spam/ODExMjI6MTg1NzM0MDA3N > Tpyb2JAbmMwYi5jb206ZGVsaXZlcmVk > > _______________________________________________ > 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. -- If this email is spam, report it to https://support.onlymyemail.com/view/report_spam/ODExMjI6MTg1NzM4NTM3Nzpyb2JAbmMwYi5jb206ZGVsaXZlcmVk _______________________________________________ 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.
