FWIW we've played with various SMA-to-SFP converter boards in the lab for
10MHz or 100MHz distribution.
A bare-bones SFP board is e.g.
https://github.com/aewallin/SFP-Breakout-Board
That interfaces directly to the differential AC-coupled TX and RX pins of
an SFP.
If you want some buffering (and l
David I. Emery writes:
> On Sun, Aug 29, 2021 at 10:43:51AM -0400, paul swed wrote:
> Not completely clear what the common
> mode Z of the things is at 10 MHz...
Twisted pair is 135 Ohm.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RF
On Sun, Aug 29, 2021 at 10:43:51AM -0400, paul swed wrote:
> We my only issue is every time we had a lightning storm it seemed to
> fry the ICs.
While they may not have ideal behavior with temperature (and
related phase/group delay changes) the old antique 10Mbs era balanced
twisted p
On 30/8/21 5:24 am, Lux, Jim wrote:
> Yeah, but those are piece parts. What would be nice is if a cheap "box"
> could be found - ideally (for 10 MHz) BNC in/out and fiber connector
> with a wall wart for power. Maybe this a good idea for a TAPR project if
> someone was willing to do the design (!)
Hi
Ok so what is “decent” performance?
Is -150 dbc/ Hz “floor” good enough? it is for some stuff ….
Is -130 dbc/ Hz at 10 Hz a requirement?
Is -100 dbc / Hz at 1 Hz the target?
Is 1x10^-12 at 1 second “good enough” ADEV?
How about 1x10^-13 at 10 seconds …..
Keep in mind that these are sys
On 8/29/21 12:13 PM, CFO wrote:
From here
https://forums.xilinx.com/t5/Serial-Transceivers/Sending-10Mhz-clock-over-Fiber/td-p/1026390
They suggest these
*** SNIP ***
what length do you need to send over ?
this sort of stuff is a LOT cheaper and more rugged, and more than
capable of sendin
From here
https://forums.xilinx.com/t5/Serial-Transceivers/Sending-10Mhz-clock-over-Fiber/td-p/1026390
They suggest these
*** SNIP ***
what length do you need to send over ?
this sort of stuff is a LOT cheaper and more rugged, and more than
capable of sending 10 MHz clock
Cable
https://uk.fa
On Sun, 29 Aug 2021 13:56:42 -0400, time-nuts-requ...@lists.febo.com
wrote:
Re: time-nuts Digest, Vol 208, Issue 24 (messages 2, 4, and 15)
> --2
Date: Sun, 29 Aug 2021 09:51:39 -0400
From: Bob kb8tq
Subject: [time-nuts] Re: Query about List and about 10 MHz Distro
On 8/29/21 10:29 AM, Robert DiRosario wrote:
Andrew Sureflex (FSJ) is a lot more flexible then the LDF4 Healix,
which is what you find a
lot of on ebay and at hamfests.
Here is some 1/4" Sureflex, new:
Andrew Type N Male to Type N Male Sureflex Cable 30 feet
F1RNA-PNMNM-30-L1 NEW!
https://w
This has been an interesting thread.
I purchased some 1/4" FSJ with BNC connectors from the usual auction site years
ago for time nuts use but never installed it. It does seem to be a bit of a
hassle to use in my time lab (I do use some FSJ with N connectors in parts of
my home amateur radio
Hi
With *any* cable setup, proper termination is vital. An improperly terminated
balanced line can be just as bad as a poorly terminated coax. Things like
common mode chokes are part of a *lot* of setups.
What gets messy is that a lot of gear does not properly terminate the cable.
It’s high-z
Andrew Sureflex (FSJ) is a lot more flexible then the LDF4 Healix, which
is what you find a
lot of on ebay and at hamfests.
Here is some 1/4" Sureflex, new:
Andrew Type N Male to Type N Male Sureflex Cable 30 feet
F1RNA-PNMNM-30-L1 NEW!
https://www.ebay.com/itm/173863049072
US $30.00 + $13.0
On Sun, 29 Aug 2021 03:30:23 -0400, time-nuts-requ...@lists.febo.com
wrote:
Re: time-nuts Digest, Vol 208, Issue 23 (message 3)
> Date: Sat, 28 Aug 2021 18:57:08 -0500
> From: Dana Whitlow
> Subject: [time-nuts] Re: Query about List and about 10 MHz Distro
> To: Discussion of precise time and fr
On Sun, 29 Aug 2021 03:30:23 -0400, time-nuts-requ...@lists.febo.com
wrote:
Re: time-nuts Digest, Vol 208, Issue 23 (Msg 10)
> Date: Sun, 29 Aug 2021 14:33:24 +1000
> From: Julien Goodwin
> Subject: [time-nuts] Re: of possible interest
> To: time-nuts@lists.febo.com
>
> On 21/3/20 6:07 am, djl
Robert wrote:
What about double shielded RG-223, or Thinnet ethernet cable?
Most Thinnet has both a braided shield and a foil wrap.
IME, thinnet cable is notoriously leaky. I have also not had success
with double-shielded cables such as RG-223.
Unless you go all the way to hardline (some o
In Southern California Edison's region I know that 60Hz used as a time
reference has been unstable in possibly the last 10+ years. I have found that
depending on whether in the summer clocks which use this reference tend to run
slower, and in the winter they run faster.
Have you noticed that i
exactly
On Sun, Aug 29, 2021 at 10:45 AM Dana Whitlow wrote:
> Andy,
>
> Balanced twisted pair may be helpful, but only if adequate precautions are
> taken to
> avoid creation of common mode *currents *on the line*.*
>
> Dana
>
>
> On Sun, Aug 29, 2021 at 9:34 AM Andy Talbot wrote:
>
> > Hence
Andy,
Balanced twisted pair may be helpful, but only if adequate precautions are
taken to
avoid creation of common mode *currents *on the line*.*
Dana
On Sun, Aug 29, 2021 at 9:34 AM Andy Talbot wrote:
> Hence my observation that balanced twisted pair might be a better solution
> than coax fo
Andy
The balanced line does work and does reduce the emissions on a 160 ft run.
Used it for 1, 5, 10 MHz.
We my only issue is every time we had a lightning storm it seemed to
fry the ICs.
The line drivers and receivers were analog devices ADSL type technology.
Was a bit of a pain to deal with a
Started into white rabbit on fiber recently - one tidbit that was
shared with me: White rabbit typically uses a BIDI over a single fiber
to keep the fiber length (and respective transmit / receive times) as
close as possible
Martin
W2RWJ
On 8/29/2021 10:03 AM, paul swed wrote:
I did see
Paul is right, and it can be difficult to figure out which cable works well
at a given
wavelength and which connector type is which. A phone conversation with an
applications person at the cable supplier ought to help avoid any of the
traps
At the Arecibo Observatory we had some bad experiences w
Hence my observation that balanced twisted pair might be a better solution
than coax for 10MHz distribution
Removes all possibility of ground loops
Andy
www.g4jnt.com
On Sun, 29 Aug 2021 at 15:22, Dana Whitlow wrote:
> I believe that a significant problem in my case was not leakage through th
I believe that a significant problem in my case was not leakage through the
shield, but
rather common-mode currents on the cable. My experiences were with RG-6
style cable,
namely a cable that mostly went around the outside of the house for TV
distribution.
I get all the TV I want with an indoor d
I did see the tp link. Pretty amazing. For the group these devices are
pretty useful.
But watch out for the wavelength of the light you typically need matching
fiber. Also note the connectors and get the matching units.
I have no idea how well 1350 light would pass on multimode for 850 nm.
Regards
Hi
Skin depth is what gets you with most coax at 10 MHz, even with the “double
shield” stuff. Hardline with a nice heavy outer would do better. It’s not
terribly
practical around the typical lab. Might not be a bad choice for a “burry in the
yard”
setup though. With normal cable, the losses fr
What about double shielded RG-223, or Thinnet ethernet cable?
Most Thinnet has both a braided shield and a foil wrap.
Robert
On 08/28/2021 08:26 PM, Bob kb8tq wrote:
Hi
Anything you do that has a bunch of 10 MHz cables running out from here or there
will impact your ability to listen to WWV at
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