[time-nuts] Distributing GPS L1 signal to many GPS devices

[Taka Kamiya]

Oh, yes.  For "production" GPS (one I actually use in lab), there is ONE and only one GPSDO.  I then distribute the 10MHz.  I have a master distribution amp then from there, I have more dist-amp hanging off.

I have a separate rack where I have lots of time related equipment.  This is an experimental side.  I work on fun stuff here.  There, I ran out of antenna ports.

--------------------------------------- 
(Mr.) Taka Kamiya
KB4EMF / ex JF2DKG
 

    On Tuesday, September 24, 2019, 5:00:46 PM EDT, Dana Whitlow <k8yumdoober at gmail.com> wrote:  
 
 You could minimize problems with accumulated differential delays by *not*
daisy chaining- rather arrange the splitters in a hierarchical fashion
so that all your outputs have an equal number of splitters in the path.

I think your problem is that you started with more than one GPSDO.
You need to learn to live with just one.  Why not instead split its outputs
(1PPS and 10 MHz) with splitters?  The resulting system should be less
expensive, and all your references would track in their delays.  With
separate GPSDOs, you cannot be sure that they will always do the
same thing in the face of GPS signal impairments as well as just
plain ordinary noise.

Dana


On Tue, Sep 24, 2019 at 2:03 PM Taka Kamiya via time-nuts <
time-nuts at lists.febo.com> wrote:

> Currently, I have a symetricom antenna outside that feeds an HP58536A (4
> port).  One of the output port daisy chains to another HP58536A's antenna
> port.  That gives me 7 ports total. Well, I need more.  I can simply daisy
> chain another one but it doesn't look like an elegant solution.  Besides,
> if I only turn on GPS on the last port, it will end up driving all of the
> active distributor amps.  Also, signal delay would be a concern.
>
> I KNOW there are many folks here who has more than dozen GPSDOs.  How do
> you do it?  Obviously, buying an 8 port version is one of the solutions but
> what if I need to expand that?  My goal is like 20 ports for future
> craziness.
>
> GPSDOs tend to grow during my sleep.  It must be because I started with
> just two.
>
>
>
> ---------------------------------------
> (Mr.) Taka Kamiya
> KB4EMF / ex JF2DKG
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