[time-nuts] GPSDO using 100Hz

[WarrenS]

Sorry my example should of said skip 126 cycles every 500 seconds (500/4 +1)
----- Original Message ----- 
From: "WarrenS" <warrensjmail-one at yahoo.com>
To: <time-nuts at febo.com>
Sent: Monday, November 24, 2008 10:27 AM
Subject: Re: [time-nuts] GPSDO using 100Hz


> Mike
> 
> Neither do I, know how to reply to a post that is. This may be the blind leading the blind 
> and end up in some unknown place.
> True it would be simpler to use the High freq Osc directly but it would not be accurate.
> The problem with just using the High freq as you suggested is that it is not at any known, exact or even constant  frequency.
> The divider  number can change for each low freq cycle. Example if the master freq was say 0.2520 Hz high then 
> every forth second the divider would add 1 extra divide count and every 500th second it would divide by an additional extra clock time, 
> therefore skipping 11 divides every 500 seconds.  
> 
> Regards,
> Warren
> ************
> ----- Original Message ----- 
> From: "Mike Monett" <XDE-L2G3 at myamail.com>
> To: <time-nuts at febo.com>
> Sent: Monday, November 24, 2008 9:02 AM
> Subject: Re: [time-nuts] GPSDO using 100Hz
> 
> 
>> Hi,
>> 
>> Sorry, I don't know how to reply to a post using the digest. But my
>> question is if 100Hz or 10KHz are available from a GPS unit, where do they
>> come from? Does that mean there is a 10MHz oscillator somewhere on the pcb
>> that is just divided down?
>> 
>> If so, then adding another PLL loop to control an external 10MHz crystal
>> will just add additional noise, jitter, variable phase offset, etc.
>> 
>> If there is already a 10MHz oscillator, wouldn't it be simpler to add a
>> buffer like paralleled sections of a 74AC04 to the source, and drive a 50
>> ohm coax directly?
>> 
>> Regards,
>> 
>> Mike Monett
>> 
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