[time-nuts] Distributiuon Amlifier Altinex DA1804NT

[Vlad]

Bob,

You are correct. I am using HP 5386A. And its only HP counter I have. I 
set Gate time equal to 10sec. May be this gate time is an issue ? The 
other settings is .1s, and 1s.
Meantime, I did switch ref signal source from Trimble TB to Oscilloquarz 
8663-SX OCXO and connected MV89A to counter input. 8 hours later, I'll 
see what will be on chart.

Regards,
Vlad

On 2015-05-28 21:50, Bob Camp wrote:
> Hi
> 
> *IF* I’m understanding you correctly, you are measuring this data
> with an HP 5386.
> 
> That’s only a 4 ns counter. I agree with Tom that there is something
> weird in your setup, but that
> still does not help the basic limit of the counter’s resolution. You
> will need to be out around 1,000
> seconds or more to get to the noise on the OCXO. At any time shorter
> than that you are either
> measuring the counter’s noise or noise in your setup.
> 
> If you have one, a 5335 would be a better counter to use than the 5386.
> 
> Bob
> 
>> On May 27, 2015, at 10:04 PM, Vlad <time at patoka.org> wrote:
>> 
>> 
>> Hello,
>> 
>> Recently, I acquired video distribution amplifier (model Altinex 
>> DA1804NT). It says it could handle 350Mhz. I am planing to use it to 
>> split 10Mhz Ref signal from my OCXO. This OCXO I bought on auction 
>> site. It has Oscilloquarz model 8663-SX plus some components which 
>> give me 4 outputs - 2 sines and two squares. After few days of "warm 
>> up" I did measurement of ADV from one of the sine outputs and then 
>> measurement of the same sine signal from OCXO, but this time through 
>> the Altinex DA. Each test took 8 hours. Attached is the results.
>> 
>> NOTE: on the ALTINEX* charts I forgot to change the label for OCXO. 
>> So, its not DATUM. It is Oscilloquarz 8663-SX
>> I was using Trimble TB as a ref signal  for HP 5386
>> 
>> Since I have no  instruments which measuring phase noise, I am 
>> interesting, what will be the quick method to measure the phase noise 
>> for that DA ?
>> 
>> 
>> --
>> WBW,
>> 
>> V.P.<ALTINEX-DA.png><ALTINEX-DA-F.png><ALTINEX-DA-T.png><OCXO2.png>_______________________________________________
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-- 
WBW,

V.P.