[time-nuts] Inside a CTS 1960017 OCXO

[jimlux]

Line frequency is suspicious from either power supply or measurement system standpoint. 


Sent via the Samsung Galaxy S®6 active, an AT&T 4G LTE smartphone-------- Original message --------From: "Rob Sherwood." <rob at nc0b.com> Date: 2/27/2016  1:07 PM  (GMT-08:00) To: 'Discussion of precise time and frequency measurement' <time-nuts at 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 capacitor across the Vcc pin and it had no effect.  I don't think it has anything to do with the power supply since both of us saw the same thing.  If an attachment will go through this reflector, I can post a spectrum analyzer screen shot.  

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of jimlux
Sent: Saturday, February 27, 2016 12:07 PM
To: time-nuts at febo.com
Subject: 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 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?
>


Is it right at line frequency, or is it "close" to 60 Hz?

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