Re: [time-nuts] Inside a CTS 1960017 OCXO

Interesting in that the internal construction is similar to the 5.55MHz CTS OCXO opened (with a propane torch - nothing inside can was damaged) to deduce out the pinout and the supply voltage.Oscillator circuit was similar although the output buffer was a CMOS flipflop that divided the 

Re: [time-nuts] Inside a CTS 1960017 OCXO

Hi all, I worked out the schematic for the CTS OCXO. You can find it here: http://syncchannel.blogspot.com/2016/03/schematic-of-cts-1960017-10mhz-ocxo.html Best regards, Dan W. ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

Re: [time-nuts] Inside a CTS 1960017 OCXO

Bob, I was referring to the bulk of the conversations on this device where people were finding 60 Hz related artifacts. Greg >On Date: Mon, 29 Feb 2016 21:11:19 -0500 >From: Bob Camp wrote: > >Hi > >On some parts the spur shows up in the 40 to 80 Hz range. >That pretty much rules out the line

Re: [time-nuts] Inside a CTS 1960017 OCXO

Hi The spectrum plots and scope plots do not look like a blocking oscillator. They look very much like an internal spur generated by something in the circuit taking off at low frequency. Bob > On Mar 1, 2016, at 10:09 AM, Alex Pummer wrote: > > sometimes high frequency

Re: [time-nuts] Inside a CTS 1960017 OCXO

sometimes high frequency oscillators could get in certain mode of operation the "blocking oscillation" see here: https://en.wikipedia.org/wiki/Blocking_oscillator, also it could happen, that the high frequency oscillation does not stops entirely, just undergoes an amplitude fluctuation, that

Re: [time-nuts] Inside a CTS 1960017 OCXO

Hi On some parts the spur shows up in the 40 to 80 Hz range. That pretty much rules out the line frequency. Bob > On Feb 29, 2016, at 5:04 PM, Gregory Muir wrote: > > Not sure if I am missing something here or not but an early mention was made > regarding synching the

Re: [time-nuts] Inside a CTS 1960017 OCXO

Not sure if I am missing something here or not but an early mention was made regarding synching the test equipment used to the 60 Hz line to see if the purported 60 Hz anomaly is actually synchronous or asynchronous. I haven't heard anything regarding this since then. Greg

Re: [time-nuts] Inside a CTS 1960017 OCXO

; From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Rob Sherwood. > Sent: Saturday, February 27, 2016 7:20 PM > To: Discussion of precise time and frequency measurement <time-nuts@febo.com> > Subject: Re: [time-nuts] Inside a CTS 1960017 OCXO > > Both Adam

Re: [time-nuts] Inside a CTS 1960017 OCXO

the outcome? Tom Holmes, N8ZM -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Rob Sherwood. Sent: Saturday, February 27, 2016 7:20 PM To: Discussion of precise time and frequency measurement <time-nuts@febo.com> Subject: Re: [time-nuts] Inside a CTS 1

Re: [time-nuts] Inside a CTS 1960017 OCXO

Pretty much agree with Dave M. But just like HP, PDI had their basic supplies and their 'low noise/ripple' models, and of course the model with the heater for voltage stability. The one Dave is talking about has a temp controlled voltage reference. The easiest way to tell is there is a 'HEATER'

Re: [time-nuts] Inside a CTS 1960017 OCXO

Hi For a lot of years the Power Designs supplies were the best kept secret in the business. Everybody thought they had “discovered” them for phase noise testing. They still are a pretty good deal surplus. Bob > On Feb 28, 2016, at 10:25 PM, Dave M wrote: > > Pete

Re: [time-nuts] Inside a CTS 1960017 OCXO

My T-bolt is running on a Power-one International Series HCAS-60W-A supply, hefty enough to run at least 4 more. Ripple and noise measure less than 100 micro-volts peak-to-peak. The T-bolt seems quite happy. Jeremy On Sunday, February 28, 2016, Dave M wrote: > Pete

Re: [time-nuts] Inside a CTS 1960017 OCXO

Pete Lancashire wrote: ... I was using an HP lab supply>>> Model ? Age ? My bench has some pretty old HP's even Harrison Lab branded supplies. I have had to re-cap a few of them. In a way it is almost a curse how reliable their supplies were. You always got the V and I you wanted so one never

Re: [time-nuts] Inside a CTS 1960017 OCXO

Hi We have at least one example of the spurs being in the 40 to 80 Hz range “depending”. That strongly suggests that the original analysis is correct and that it is a spur in the OCXO rather than line noise induced issues in a test setup. Bob > On Feb 28, 2016, at 5:49 PM, Bill Byrom

Re: [time-nuts] Inside a CTS 1960017 OCXO

If the spurs are at exactly 60 Hz multiples (not 120 Hz or 180 Hz) and you are in an area with 60 Hz line power you might have magnetic field coupling from nearby power transformers. Normal conductive shielding won't solve this issue, and Mu-Metal or other high permeability low frequency materials

Re: [time-nuts] Inside a CTS 1960017 OCXO

ing. If an attachment will go through this reflector, I can > post a spectrum analyzer screen shot. > > -Original Message- > From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of jimlux > Sent: Saturday, February 27, 2016 12:07 PM > To: time-nuts@febo.com >

Re: [time-nuts] Inside a CTS 1960017 OCXO

gt; > NC0B > > > > -Original Message- > > From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob > Camp > > Sent: Saturday, February 27, 2016 2:26 PM > > To: Discussion of precise time and frequency measurement > > Subject: Re: [time-nut

Re: [time-nuts] Inside a CTS 1960017 OCXO

> Rob > NC0B > > -Original Message- > From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp > Sent: Saturday, February 27, 2016 2:26 PM > To: Discussion of precise time and frequency measurement > Subject: Re: [time-nuts] Inside a CTS 1960017

Re: [time-nuts] Inside a CTS 1960017 OCXO

Hi Dan how many of these oscillators have that low freq.hum? 73 KJ6UHN Alex On 2/27/2016 6:25 PM, Daniel Watson wrote: Hi, Attached is a plot of the output frequency difference from 10MHz during warm-up. I believe this indicates the crystal is SC cut. The VREF and EFC pins on the unit do

Re: [time-nuts] Inside a CTS 1960017 OCXO

measurement Subject: Re: [time-nuts] Inside a CTS 1960017 OCXO Hi A small air gap is actually a better insulator than conventional foam. You don’t get much of a convection cell going at those spacings. The part likely pulls a bit over a watt at room. If you put an insulator on the gizmo you increase

Re: [time-nuts] Inside a CTS 1960017 OCXO

...@febo.com] On Behalf Of Hal Murray Sent: Saturday, February 27, 2016 3:32 PM To: Discussion of precise time and frequency measurement Cc: hmur...@megapathdsl.net Subject: Re: [time-nuts] Inside a CTS 1960017 OCXO r...@nc0b.com said: > I cannot say exactly, as I measured it as 59 Hz. VA7OJ measu

Re: [time-nuts] Inside a CTS 1960017 OCXO

Hi, Attached is a plot of the output frequency difference from 10MHz during warm-up. I believe this indicates the crystal is SC cut. The VREF and EFC pins on the unit do work. The VREF is 4.1V. I probed around the board of the unit I cracked open and found a low frequency oscillation. It seems

Re: [time-nuts] Inside a CTS 1960017 OCXO

niel 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, an

Re: [time-nuts] Inside a CTS 1960017 OCXO

the details. Bob On Feb 27, 2016, at 12:44 PM, Tom Miller <tmiller11...@verizon.net> wrote: - Original Message - From: "Daniel Watson" <watsondani...@gmail.com> To: <time-nuts@febo.com> Sent: Saturday, February 27, 2016 11:48 AM Subject: [time-nuts] Inside a CTS 1

Re: [time-nuts] Inside a CTS 1960017 OCXO

r...@nc0b.com said: > I cannot say exactly, as I measured it as 59 Hz. VA7OJ measured it as 60 > Hz. I was using an HP lab supply, and Adam was using some other lab supply. > I put a 500 uF capacitor across the Vcc pin and it had no effect. I don't > think it has anything to do with the power

Re: [time-nuts] Inside a CTS 1960017 OCXO

of precise time and frequency measurement > Subject: Re: [time-nuts] Inside a CTS 1960017 OCXO > > > > Hi > > The controller shown on the PC board is not a chopper. The only reason you > would be getting 60 Hz is that somebody did an “aw shucks” and left a part > off t

Re: [time-nuts] Inside a CTS 1960017 OCXO

of precise time and frequency measurement' <time-nuts@febo.com> Subject: Re: [time-nuts] Inside a CTS 1960017 OCXO I cannot say exactly, as I measured it as 59 Hz.  VA7OJ measured it as 60 Hz.  I was using an HP lab supply, and Adam was using some other lab supply.  I put a 500 uF capaci

Re: [time-nuts] Inside a CTS 1960017 OCXO

...@gmail.com> > To: <time-nuts@febo.com> > Sent: Saturday, February 27, 2016 11:48 AM > 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 pu

Re: [time-nuts] Inside a CTS 1960017 OCXO

: [time-nuts] Inside a CTS 1960017 OCXO On 2/27/16 9:35 AM, Rob Sherwood. 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 clo

Re: [time-nuts] Inside a CTS 1960017 OCXO

t; 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 o

Re: [time-nuts] Inside a CTS 1960017 OCXO

Hi I believe you will find that the crystal in the picture is either an HC-45 or HC-43 sized package. Bob > On Feb 27, 2016, at 12:17 PM, Graham / KE9H wrote: > > Dan: > > Thanks for photo documenting the tear down of the CTS oven oscillators. > I bought a few, and

Re: [time-nuts] Inside a CTS 1960017 OCXO

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 t

Re: [time-nuts] Inside a CTS 1960017 OCXO

On 2/27/16 9:35 AM, Rob Sherwood. 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

Re: [time-nuts] Inside a CTS 1960017 OCXO

- Original Message - From: "Daniel Watson" <watsondani...@gmail.com> To: <time-nuts@febo.com> Sent: Saturday, February 27, 2016 11:48 AM Subject: [time-nuts] Inside a CTS 1960017 OCXO Hi, I'm sure many of you are tracking the cheap CTS 10MHz OCXOs availabl

Re: [time-nuts] Inside a CTS 1960017 OCXO

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

Re: [time-nuts] Inside a CTS 1960017 OCXO

Nice teardown. I was looking at that listing just yesterday. I am tempted, but don't know what I'd do with 40. The real question is, how do they perform? Joe Gray W5JG On Feb 27, 2016 9:48 AM, "Daniel Watson" wrote: > Hi, > > I'm sure many of you are tracking the cheap

Re: [time-nuts] Inside a CTS 1960017 OCXO

Dan: Thanks for photo documenting the tear down of the CTS oven oscillators. I bought a few, and was interested in what was inside. I was surprised to see an HC-6 style crystal, but at least it was a cold-weld case. I note that you did some design work for Adafruit. Curiosity question: Did they

[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: