[time-nuts] GPSDO 10MHZ Splitter

[Dana Whitlow]

One can reduce the gulp factor mentioned by Scott quite a bit by buying
one of the non-connectorized versions from Mini-Circuits and wiring up
one's own BNC connectors.

One thing to keep in mind with these isolating splitters is that the
isolation
between outputs is good only if the impedance of the driving source is
pretty
accurately 50 ohms resistive.  This will not generally be true if the
source is
logic gate of some kind, although a parallel combination of several HCMOS
or ACMOS inverters combined with a series output resistor to bring the
output impedance up to 50 ohms will probably work well.

Dana   (K8YUM)

On Fri, Jun 21, 2019 at 12:18 PM W7SLS <w7sls.scott at gmail.com> wrote:

> A couple of ideas:
>
> Make one:
>
>         Several hours and a few $  (cheap if you value your time as free)
>                 agree, not a lot of isolation between the outputs
>         Case, connector, and three 16.67 ohm resistors
>         in —> 16.67 ohms —> 16.67 ohms to output 1
>                                        —> 16.67 ohms to output 2
>
>         Ref:
> https://www.markimicrowave.com/blog/how-to-make-an-n-way-power-splitter/
>
> Perhaps free (may or may not work):
>
>         Television 75 ohm splitter
>         agree, mismatch between 75 ohms and 50 ohms
>         agree, ugh to F connectors
>
>         Ref: I don’t know if this just occurred to me, or if I read it
> (e.g., on this group)
>
> Buy one:
>
>         Example: Mini-Circuits ZSC-2-1+, about $50 new
>
> https://www.minicircuits.com/WebStore/dashboard.html?model=ZSC-2-1%2B <
> https://www.minicircuits.com/WebStore/dashboard.html?model=ZSC-2-1+>
>
> Gulp:
>
>         Your mileage may vary
>         BNC-T connector
>
> As mentioned elsewhere:
>
>         Legacy RGB distribution boxes (e.g. Extron), about $40 on auction
> sites
>         Yes, they are 75 ohms, but may be fine, or you can change the
> internal resistors to move to 50 ohms.
>
> And of course there are other ($$$) solutions.
>
> (Obviously) I defer to the wisdom of the group (and perhaps groans and eye
> rolls).
>
> Best of luck, whatever you choose.
>
> Scott
> W7SLS
>
>
>
>
> > On Jun 21, 2019, at 7:27 AM, Don Meadows <donmeadows07 at gmail.com> wrote:
> >
> > Is there an easy, and cheap way to add a splitter the 10Mhz signal
> > from GPSDO, without going to a distribution amplifier to
> > feed two different devices?
> >
> > I really don’t want to build a complicated project, or
> > spend $200.00 dollars for an 8 output distribution amp
> > off the net.  One output would be dedicated for my
> > counter time base, and the other would be an ‘extra’
> > 10MHZ source for another counter, or just to display on the scope.
> >
> > I don’t have a GPSDO yet, I just can’t decide on one.
> > I am leaning to the Trimble, but it’s still undecided.
> >
> > Could anyone comment on buying a “Refurbished by Seller”
> > GPSDO on E-bay. They are a few dollars cheaper, but I really
> > want one I can have trust and confidence in.
> >
> > Sorry for the long post.
> > Thanks, Don
> >
> >
> >
> > Sent from Mail for Windows 10
> >
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