[time-nuts] Brooks Shera

[Brooke Clarke]

Hi Peter:

The code on that page is for the divider that Tom did in a PIC.
It's not the Shera GPSDO.
http://www.prc68.com/I/PRC68COM.shtml#TVB

Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.precisionclock.com
http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam


Peter Lacey wrote:
> ); SAEximRunCond expanded to false
> Errors-To: time-nuts-bounces+brooke=pacific.net at febo.com RETRY
> 
> The source is at:
> 
> http://www.leapsecond.com/pages/ppsdiv/?C=N;O=A
> 
> Peter Lacey
> AA1ZU
> 
> -----Original Message-----
> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> Behalf Of Rex
> Sent: Wednesday, October 03, 2007 5:35 AM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Brooks Shera
> 
> David Hopkins wrote:
> 
>>); SAEximRunCond expanded to false
>>Errors-To: time-nuts-bounces+rexa=sonic.net at febo.com RETRY
>>
>>I had an email reply from him a couple of months ago. Reply was less 
>>than 24 Hours.
>>
>>A couple of weeks ago I needed a PIC for his project and ended up 
>>programming it from the file I downloaded from his site.
>>
>>Biggest problem was finding the PIC as it is quite old.
>>
>>David
>>
>>At 11:07 AM 3/10/2007, you wrote:
>>
>>  
> 
> Here in the US, it looks like Digikey still has the 16C73A available. 
> Several newer chips would probably work fine, though, loading the Shera 
> hex module, but telling the programmer what chip it is. A few chips that 
> I think would be ok: 16F73, 16F873, 16F876. Looks like at least 10 MHz 
> versions would be required for the input clock.
> 
> Has anyone ever seen the commented assembler source? I would be 
> interested to see how the filtering and math was implemented -- but I 
> guess I am not interested enough to try to dig it out without comments 
> and symbols.
> 
> 
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