[time-nuts] Another GPSDO

Joseph Gray jgray at zianet.com
Fri Dec 12 23:30:09 EST 2014


Yes, I have seen it reverse a few times already. My Z3801A has been on
since my last move, about 1.5 years ago. I plan on leaving the Lucent
on as well.

Sometime soon, I'm going to buy, build, trade, whatever some better
means of measuring these standards against each other. The DMTD
project that Bert is working on and that was reported here some time
ago sounds interesting. I am in the middle of some other things now,
but when I have time, I want to investigate that option further.

Let's see, three GPSDO's, two rubidiums, five OCXO's, four frequency
counters - it looks like there is no hope for me :-)


Joe Gray
W5JG


On Fri, Dec 12, 2014 at 7:53 PM, Bob Camp <kb8tq at n1k.org> wrote:
> Hi
>
> If you watch the Lucent vs the 3801 as it warms up, it chugs back and forth for the first 24 hours or so as it settles in. If you shut down the 3801 for a week or so, you can watch it do the same thing (now compared to the Lucent) as it warms up.
>
> Best to leave all theses OCXO based boxes on all the time.
>
> Bob
>
>> On Dec 12, 2014, at 9:17 PM, Joseph Gray <jgray at zianet.com> wrote:
>>
>> Just an update.
>>
>> I found that I didn't have another 24 VDC supply, so Mouser to the
>> rescue. The supply arrived today.
>>
>> I just finished wiring everything up and setting the Lucent boxes next
>> to my Z3801A. When I ordered the Lucent, I also ordered an HP antenna
>> splitter (shouldn't have sold the one I had, years ago).
>>
>> It took 13 minutes from powerup to get the On and STBY lights on. I
>> get a 10 MHz square wave and a 15 MHz sine wave out of REF 0.
>>
>> I just did a couple of quick measurements with my scope triggering on
>> the Z3801A. The 10 MHz from REF 0 was initially low by 1.66e-10. Ten
>> minutes later, it is 2.77e-10 high.
>>
>>
>> Joe Gray
>> W5JG
>>
>>
>> On Wed, Dec 10, 2014 at 5:05 AM, Bob Camp <kb8tq at n1k.org> wrote:
>>> Hi
>>>
>>> The antenna connectors on the front of the KS box are TNC's  ....
>>>
>>> Bob
>>>
>>>> On Dec 9, 2014, at 9:13 PM, Joseph Gray <jgray at zianet.com> wrote:
>>>>
>>>> Paul,
>>>>
>>>> Thanks for the info. I have been following most of the discussion on
>>>> these units. I have even saved several posts, so that I could
>>>> reference them once I had one of these.
>>>>
>>>> I do plan on letting it cook for quite some time. I will certainly
>>>> check it via serial port to make sure everything is OK before the 30
>>>> day warranty is up.
>>>>
>>>> I just dug up some SMA to BNC pigtails I still need to find a 24 VDC
>>>> supply (I think I have one), make a power cable, move some things to
>>>> make a space for this thing, etc.
>>>>
>>>> Joe Gray
>>>> W5JG
>>>>
>>>>
>>>> On Tue, Dec 9, 2014 at 6:22 PM, paul swed <paulswedb at gmail.com> wrote:
>>>>> Joe since the lucents are most likely NOS you will need to let it cook in
>>>>> 30 days. I now have two units and they do match up well to the 3801. But
>>>>> they did need to age. Just a heads up.
>>>>> It is nice to see them line up pretty well.
>>>>> Regards
>>>>> Paul
>>>>> WB8TSL
>>>>>
>>>>> On Tue, Dec 9, 2014 at 7:37 PM, Joseph Gray <jgray at zianet.com> wrote:
>>>>>
>>>>>> I think I have finally graduated to Junior Time Nut. I now have three
>>>>>> GPSDO's. The trusty Z3801A I have had for years. The LTE-Lite is
>>>>>> recent. The Lucent 2-box unit just arrived today. Maybe I'll finally
>>>>>> know what time it is :-)
>>>>>>
>>>>>> This Lucent is much smaller than I thought it would be. Slightly wider
>>>>>> than the Z3801A, but much shorter. Smaller is good.
>>>>>>
>>>>>> Now I need to find a 24 VDC supply and an empty space to put the new GPSDO.
>>>>>>
>>>>>>
>>>>>> Joe Gray
>>>>>> W5JG
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