[time-nuts] GPSDO 10MHZ Splitter

[Clay Autery]

Easy, Cheap, Good.... choose 2.

I looked at virtually every option....  I love to build.  I settled on 
HP 8-way and 4-way unity gain splitters WITH external power supply 
ports.  I actually retrofitted one with the very hard to find connector.
Easier to find it now...  Well worth the cost to get a small, sealed, 
metal enclosure, with really nice AND equal ports... And I can control 
the power input, and all the ports have no DC superimposed.

There are more expensive and better designs I am sure, but I really dig 
these...  they way exceed my requirements and I NEVER have to worry 
about them being THE issue if there is AN issue.

YMMV...

73,

______________________
Clay Autery, KY5G
(318) 518-1389

On 21-Jun-19 12:08, jimlux wrote:
> On 6/21/19 7:27 AM, Don Meadows 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?
>
> Just a power divider, or a BNC T, - it's not perfect, but it works.
> there's isolation and potential mismatch/reflections, so if you're 
> measuring 1E-16 ADEV, maybe not the best approach.
>
> But there's an awful lot of people who just hook up a bunch of test 
> equipment with BNC Ts.  Some equipment actually has a switch to 
> configure whether the 10MHz input is high Z or 50 ohms.
>
> For "display on the scope" you're going into a high Z input (1 Meg) - 
> so the BNC T approach will work fine.
>
> Just be aware that if you pick a coax length that is "wrong" you'll 
> make a dandy 10 MHz notch filter. (10 MHz is 30 meters in free space, 
> about 20 meters in coax, so a 1/4 wavelength is about 5 meters.. )
>
> If you go
>
> GPSDO
> cable
> BNC T on scope High Z
> cable
> Counter
>
> Then you don't have problems.
>
> If you go
>
> GPSDO
> BNC T - 5 meter cable - Scope High Z
> cable
> Counter
>
> or
> GPSDO
> cable
> BNC T on counter - 5 meter cable - Scope High Z
>
>
>
>>
>> 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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>
>
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