[time-nuts] Epoch rollover ?

k4cle at aol.com k4cle at aol.com
Fri Oct 21 14:53:32 EDT 2011


Bruce, the most common cause of a GPS receiver getting the date incorrect is  
due to cross-correlation.  And cross-correlation is usually the result of  
too much gain in the GPS antenna's LNA.  And depending on the make of the  
receiver, some will clear the date information with a power cycling and  
others require erasing the flash memory where those parameters are stored.   
Do you have a way to see the relative C/No reading for your receiver?  Most  
receivers start experiencing cross-correlation when this reading exceeds 50.  
 Regards,  Doug, K4CLE...

Connected by DROID on Verizon Wireless

-----Original message-----
From: Bruce Lane <kyrrin at bluefeathertech.com>
To: time-nuts at febo.com
Sent: Wed, Oct 19, 2011 22:00:40 GMT+00:00
Subject: Re: [time-nuts] Epoch rollover?

	Heh... Well, that's annoying. This being the case, I have no idea why
the date went whacko...

	Thanks.

*********** REPLY SEPARATOR  ***********

On 19-Oct-11 at 17:45 Joseph M Gwinn wrote:

>The last rollover was in August 1999, just before Y2K, and the next
>rollover will be in April 2019.
>
>
>
>
 
>                                                            
>  From:       "Bruce Lane" <kyrrin at bluefeathertech.com>
 
>                                                            
>
 
>                                                            
>  To:         time-nuts at febo.com
 
>                                                            
>
 
>                                                            
>  Date:       10/19/2011 05:19 PM
 
>                                                            
>
 
>                                                            
>  Subject:    [time-nuts] Epoch rollover?
 
>                                                            
>
 
>                                                            
>  Sent by:    time-nuts-bounces at febo.com
 
>                                                            
>
 
>                                                            
>
>
>
>
>
>Hi, gang,
>
>		 Did we just have another GPS epoch rollover? My trusty old
>Odetics 425
>seems to believe the date is March 4th, 1992.
>
>		 I could probably correct it in firmware, if I looked hard and
>long
>enough, but the ToD is still correct and the frequency standard is
>staying nicely locked. Not sure if recovering the correct Julian date is
>worth the effort.
>
>		 Thanks much.
>
>
>Bruce Lane, Owner & Head Hardware Heavy,
>Blue Feather Technologies (http://www.bluefeathertech.com)
>Assoc. member, AZA & AAZK for many moons.
>"Salvadore Dali's computer has surreal ports..."
>
>
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