[time-nuts] Inside a CTS 1960017 OCXO

[Rob Sherwood.]

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-1960017.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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