[time-nuts] Re: Query about List and about 10 MHz Distro

[Lux, Jim]

On 8/28/21 9:56 AM, Andy Talbot wrote:
> When I asked about this on another Group a while back, I was told the phase
> noise made it an undesirable solution.
>
> Although I never tried it, I would imaging balanced shielded twisted pair
> would be a better way to go.   Immune from ground loop problems than can
> beset coax distribution and a whole raft of ICs support the medium, from
> RS422 to CAN bus drivers and receivers.
>
>
> Andy
> www.g4jnt.com

We use fiber to distribute high quality 10 and 100 MHz at JPL. I can 
visualize the rack downstairs from my office where the cables terminate, 
but I can't for the life of me remember the brand name. It's a 3U card..

DSN does it as well, with obsessive attention to temperature, mechanical 
stress, etc.


 From 20 years ago: 
https://tmo.jpl.nasa.gov/progress_report/42-148/148L.pdf - probably overkill


PTS has a Fiber distribution amp: https://www.ptsyst.com/DA1-100-10-FO-B.pdf


There's this, but Im going to bet it's pricey:
https://emcore.com/products/reference-timing/




>
>
> On Sat, 28 Aug 2021 at 17:51, AC0XU (Jim) <James.Schatzman at ac0xu.com> wrote:
>
>> I am hoping that you can help me about a couple of things:
>>
>> 1) My time-nuts summaries sometimes appear unformatted and unreadable. All
>> the text from all the postings is crammed together without spacing. How can
>> I fix it?
>>
>> 2) I want to distribute 10 MHz references by fiber. There are
>> RF-over-Fiber products available, but too expensive for me (thousands of
>> $$$ per xmit/rcv set).  I am thinking that it should be possible to use
>> fiber Ethernet components to do this. I don't mean IEEE 1588 but a much
>> simpler, no-computer-required, solution. Possibly just converting sine wave
>> (coax) to square wave (fiber) to sine wave (coax). I am looking for a low
>> cost solution. Any thoughts or recommendations??
>>
>> Thanks!
>>
>> Jim
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