[hpsdr] GPS 1PPS board

[Henry Vredegoor]

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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