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

[Dana Whitlow]

I was looking for something similar about 18 months or so ago.  Although I
haven't taken any
action yet, I concluded that one could do a nice job for under $200 per
segment, including the
transmitter and receiver modules and lots of connectorized multimode
fiber.  What I *don't* know
is what the phase noise performance would be, except that I do know that
the fiber's VF *is*
materially influenced by temperature.

I was looking primarily at the HFBR-2416 for the fiber receiver, and the
HFBR-1412 (standard
power) or the HFBR-1414 (high power option) for the transmitter   Unlike
most of the available
models, these are fundamentally analog devices, meaning that you can
transmit sinewave
10 MHz through them.  At the time I was looking, Mouser was selling these
for about $20 each.

See the datasheet at
https://www.mouser.com/datasheet/2/678/AV02-0176EN_2019-02-15-1827546.pdf
with particular attention to page 21 regarding the HFBR-2416 receiver.

I was also looking at Fiber Instrument Sales for patch cords.  We bought a
lot of fiber stuff from
them at Arecibo, and I was always happy with them.  See:
https://www.fiberinstrumentsales.com/catalog-cable-assemblies?gclid=Cj0KCQjwvaeJBhCvARIsABgTDM7eNTkP2nQbyFzhcwDE38VnSEP879MBKV1ZyDq2YrnEtOn7_VfzjbkaAtpfEALw_wcB

Somebody had pointed out yet another source of connectorized fibers ("patch
cords") to me, but I cannot find the name
at the moment.

Dana   K8YUM


On Sat, Aug 28, 2021 at 11:52 AM 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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