[hpsdr] GPS 1PPS board

[Graham / KE9H]

Henry:

Discussions I have read in archive of  "Time Nuts"
would indicate that it is safe to assume that they jitter
together. There may be a PLL involved with the 10 kHz
output, but it was described as being "jerked around"
once every second.

--- Graham

Henry Vredegoor wrote:
> Hi Graham, All,
>
> Is the jitter spec specifically for the 1pps signal only or does this also
> apply to the 10KHz output?
> (I could imagine these being "coupled", the 1pps signal being derived from
> the 10 KHz, so it would apply for both)
>
>
> 73,
>
> Henry.
>
>
>
>
>
>
>
>   
>> -----Original Message-----
>> From: hpsdr-bounces at lists.hpsdr.org 
>> [mailto:hpsdr-bounces at lists.hpsdr.org] On Behalf Of Graham / KE9H
>> Sent: maandag 6 april 2009 18:12
>> To: Chris Salinas
>> Cc: HPSDR discussion list
>> Subject: Re: [hpsdr] GPS 1PPS board
>>
>>
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> Chris:
>>
>> Although a cheap way to get started, this is a navigation 
>> receiver, not 
>> a timing receiver,
>> and it will not be a good choice for frequency control.  This 
>> one's spec 
>> is that the 1 pps
>> signal has a jitter spec of +/- 1 microsecond.  Timing 
>> receivers, such 
>> as the Motorola
>> Oncore UT+ have a timing mode, that provides jitter around +/- 50 
>> nanoseconds,
>> without sawtooth correction, and sub 10 nanoseconds with sawtooth 
>> correction.
>>
>> You want a timing receiver, or a receiver with a timing mode 
>> option for 
>> frequency
>> control.
>>
>> --- Graham / KE9H
>>
>> ==
>>
>> Chris Salinas wrote:
>>     
>>> Hi All,
>>>  
>>> With Excalibur being designed, a good 10Mhz time-base is needed.
>>>  
>>> I came across (on Ebay) a Rockwell Jupiter board that could 
>>>       
>> be used in 
>>     
>>> an accurate 10MHZ source.
>>>  
>>>
>>>       
>> http://cgi.ebay.com/Rockwell-Jupiter-12-channel-GPS-receiver-O
>> EM-module_W0QQitemZ290306684157QQcmdZViewItemQQptZGPS_Accessor
>> ies_Cables?hash=item290306684157
>>     
>>>  
>>> Here's a manual I came across:
>>>  
>>> http://www.gpskit.nl/documents/rockwell/jupiter-gps-board.pdf
>>>  
>>> Pin 19 on this board has the 1 PPS signal, so I wonder what 
>>>       
>> it  would 
>>     
>>> take to integrate it into Gibraltar or come up with a 10 Mhz source 
>>> for Excalibur using this board.
>>>  
>>> There are over 900 boards from the source.
>>>  
>>> Chris N0TTW
>>>
>>>       
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>>     
>
>
>   


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