[time-nuts] Distributiuon Amlifier Altinex DA1804NT

Bob Camp kb8tq at n1k.org
Fri May 29 22:59:37 UTC 2015


Hi

I think that looks about as good as your counter can do. The slope down at 
the start is the resolution of the counter. The slope up on the right is the actual stability of 
the oscillator.

Bob

> On May 29, 2015, at 9:52 AM, Vlad <time at patoka.org> wrote:
> 
> 
> Hello,
> 
> I've finished the test. Here is the links to charts:
> 
> http://www.patoka.ca/OCXO/OCXO-8663ref-MV89A-AD.png
> http://www.patoka.ca/OCXO/OCXO-8663ref-MV89A-PD.png
> http://www.patoka.ca/OCXO/OCXO-8663ref-MV89A.png
> 
> It looks different, but its not better, I think.
> 
> Regards,
> Vlad
> 
> On 2015-05-28 23:21, Vlad wrote:
>> 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.
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