[time-nuts] Simple GPSDO Multiple Outputs - buffered line driver options?

[Taka Kamiya]

I've tried daisy chaining 4 HP5335A.  By the time signal got to the 4th box, it was too weak to reliably drive the 1 pps.  I had a terminator at the last tee with short length of RG58s between boxes.  I guess some box puts relatively heavy load on the signal?

I'd like to know why 10V is a bad idea.  (besides too close to the upper limit)  Cross talk between what/where?  

To OP:I have video amplifiers Extron MDA-3V successfully used for this.  1 port in, 3 ports out ones by Extron are very inexpensive at 10 dollars+/-.  I never did formal testing but reading on all counters matched exactly.  They are 75 ohms but it didn't matter in my use case.  You can change/adjust internal resisters if you are concerned.  

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

    On Tuesday, January 21, 2020, 7:45:22 AM EST, Bob kb8tq <kb8tq at n1k.org> wrote:  
 
 Hi

What are you driving? 

Most “normal” gear is pretty happy with a fairly wide range of input levels. Obviously things
like termination and long lengths of coax can get into the act. For 4 outputs, a passive splitter
with 6 db of loss should do just fine. You have only taken the output voltage down by 2:1 ….

Just for reference:

https://www.avionteq.com/Document/53131A-specification-sheet.pdf <https://www.avionteq.com/Document/53131A-specification-sheet.pdf>

Calls out a 200 mv to 10V RMS input level as acceptable For a variety of reasons, 10V RMS
is a really bad idea (cross talk ….). Lower is better in this case.

Bob

> On Jan 21, 2020, at 4:19 AM, skipp isaham via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Hello once again to the Group,
> 
> May I ask what the current relatively simple options are for
> expanding a Thunderbolt or equivalent... output for distribution
> to multiple devices?
> 
> Although I expect only two or three isolated / buffered outputs
> will be required in my example. I'm worried about signal level
> if a passive system (Mini Circuits divider or equivalent type)
> is used.
> 
> Would appreciate a few quick opinions on what is practical and
> seems to work well.
> 
> thank you in advance
> 
> regards,
> 
> skipp
> 
> skipp025 at yahoo dot com
> 
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