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) <[email protected]> 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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