[time-nuts] Inside a CTS 1960017 OCXO

Rob Sherwood. rob at nc0b.com
Sun Feb 28 00:20:18 UTC 2016


Both  Adam and I measure the same spurs.  Rob, NC0B

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] 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. <rob at 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-bounces at febo.com] On Behalf Of 
> Daniel Watson
> Sent: Saturday, February 27, 2016 9:48 AM
> To: time-nuts at 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-196001
> 7.html
>
> Comments on the internal construction of the OCXO are welcome. It 
> seems pretty straightforward inside though.
>
>
> Best regards,
>
> Dan W.
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