[time-nuts] Terminators on empty outputs/connectors
Graham / KE9H
ke9h.graham at gmail.com
Fri May 25 11:33:28 EDT 2018
As usual, the answer is "it depends."
If the output is a single isolated output, then terminating load not
required, but no harm providing.
If the output is a multiple output, from a single driver, through a
resistive or transformer splitter, then the level stability on all ports
and the port to port isolation is dependent on the proper termination of
So, if multiple 10 MHz or 1 pps outputs, terminations highly recommended.
On Fri, May 25, 2018 at 10:21 AM, Dana Whitlow <k8yumdoober at gmail.com>
> I recommend putting terminators on unused ports, on general principles.
> But I don't
> think it would ordinarily be necessary to use big-bucks terms, unless the
> distro amp is
> really cheaply made.
> If you have access to a VNA, it would be interesting to measure the complex
> coefficient from input to one of the output ports while experimenting with
> variations of
> the number and locations of terminations for the other output ports. If
> you find that none
> of such manipulations have any visible effect, then you can probably skip
> using terms
> on unused ports. I should mention that any such measurements should best
> be performed
> at roughly the intended operating RF power level.
> And for extra credit, report your findings to this discussion group.
> On Thu, May 24, 2018 at 3:41 AM, Clay Autery <cautery at montac.com> wrote:
> > Putting in a hardware order...
> > Question: Is it recommended to put terminators on all unused GPS Distro
> > amp ports? Output ports on GPSDO and NTP servers (10MHz and PPS).
> > Thanks!
> > --
> > ______________________
> > Clay Autery
> > MONTAC Enterprises
> > (318) 518-1389
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