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

[Joseph Gwinn]

On Sun, 29 Aug 2021 03:30:23 -0400, time-nuts-request at 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 <k8yumdoober at gmail.com>
> Subject: [time-nuts] Re: Query about List and about 10 MHz Distro
> To: Discussion of precise time and frequency measurement
> 	<time-nuts at lists.febo.com>
> 
> Bob, my own motivation  for going to fiber was entirely different.  I
> simply wanted to
> run 10 MHz all over the place from reference sources in disparate
> locations in the
> house, and I quickly discovered that cable leakage was embarrassingly
> severe.  So
> I shut down and began contemplating a fiber link.  But then reality set in
> and I realized
> that running fiber across the house had its own big problems, so I set the
> project aside.
> 
> Dana

I've run a lot of 10 MHz distribution coaxial cable, in a tree with 
links as long as 50 meters, and planned systems where the links were 
a few hundred meters.  It's necessary to use double-shielded coax 
with machined TNC (not BNC) connectors on cables and the (passive) 
power dividers.  The cable shielding effectiveness must exceed 80 dB 
per meter.  Be sure  to torque the connectors to the "inspection 
torque" range specified by the connector manufacturer.  At 10 MHz, 
cable losses are minimal.

.<https://patents.google.com/patent/US9261587B1>

Joe Gwinn