[time-nuts] Z3805 hold-Over

[Volker Esper]

Yes, I guess, signal strength is essential. My holdover uncertainty is 
(after 1 weeks) about 1 to 2us.

Volker DF9PL

Am 11.11.2012 20:04, schrieb jmfranke:
> Your 21 ns for 1PPS and T1 does not look too bad, but the satellite
> received signal strengths are too low. You should have at least four or
> five SS values above 60-80. I always have at least three SS readings
> above 100. My Holdover runs between 03 and 4 microseconds.
>
> John WA4WDL
>
> --------------------------------------------------
> From: "Doug Parker" <doug.parker at btinternet.com>
> Sent: Sunday, November 11, 2012 1:36 PM
> To: <time-nuts at febo.com>
> Subject: Re: [time-nuts] Z3805 hold-Over
>
>>
>>
>>
>> Hi,
>>
>> I've got a Z3805 from one of the Chineese sources and had problems
>> with the HP 11801 oscillator which came with it. Even after a couple
>> of weeks operartion it was moving vast EFC voltages with the 'Holdover
>> Uncertainty Predict' reaching a lowest of 19uS.
>>
>> So I tried the HP oscillator from my Z3801 in the Z3805 and the daily
>> EFC change is back to a resonable level, but after 5 days of settling
>> down, the 'Holdeover Uncertainy Predict' has only got down to 10uS.and
>> is holding about that value.
>>
>> Could some one please advise what figures they are getting. As there's
>> something sticking in my mind that the whole system should be lower
>> than 6.3uS after 3 days of locked operation. Or have I been dreaming.....
>>
>> I have attached a JPG of my GPSCon graph, hope it helps
>>
>> thanks & 73s
>> Doug
>> G4DZU
>> http://www.g4dzu.com/
>
>
>
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>
>
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