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. <r...@nc0b.com> 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:time-nuts-boun...@febo.com] On Behalf Of Daniel > Watson > Sent: Saturday, February 27, 2016 9:48 AM > To: time-nuts@febo.com > 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-1960017.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 -- time-nuts@febo.com 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/ODExMjI6MTg1NzM0MDA3NTpyb2JAbmMwYi5jb206ZGVsaXZlcmVk > > _______________________________________________ > 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.