[time-nuts] Updated Shera controller

Brooke Clarke brooke at pacific.net
Thu Jul 29 14:15:04 EDT 2010


Hi Bert:

The PRS10 can use it's external 1 PPS input two ways.
1) as the input for a GPSDO, or
2) Time Tag (RS-232 command TT) of the input pulse
http://www.prc68.com/I/PRS10.shtml

Have Fun,

Brooke Clarke
http://www.PRC68.com


EWKehren at aol.com wrote:
> Arnold
> Have you actually done it with the PRS10 and what was the result?
> Bert
>
>
> In a message dated 7/29/2010 1:52:08 P.M. Eastern Daylight Time,
> arnold.tibus at gmx.de writes:
>
> No  problem for the PRS10 - there is an external pps input.
>
> For the FRK-RbO  I don't have a practical solution yet,
> because I don't have a manual with  circuit diagram found
> for this 5 MHz model. This RbO is actually running  free,
> drift controlled by an external resistor set by two 10  turns
> potentiometers. I think it should be possible to inject a
> current  instead. The control by eg. the Shera controller
> need some modifs for this  purpose which I have not yet done.
> The time constant need to be modified  too I think.
>
> Arnold
>
> Am 29.07.2010 18:09, schrieb  EWKehren at aol.com:
>    
>> Arnold
>> how are you controlling the Rb with  the Tbolt?   Bert
>>
>>
>> In a message  dated 7/29/2010 11:10:16 A.M. Eastern Daylight Time,
>>   arnold.tibus at gmx.de writes:
>>
>> Bert,
>> I'm using at the  moment a thunderbolt (with spare for  testpurposes
>> using ext.  other oscillators), a nice PRS10, a FRK-HLN-1A  (5MHz with
>>   external doubler to 10 MHz) and several HP10811.
>> I would like  to  build up with this a good and reliable reference
>> (PPS and Frequ.).  My  dream would be a good autonom. TIC with timestamp
>>   possibility. At the  moment the 53132A is doing a good job, but I  miss
>> the time stamp  possibility and single measurements at  defined time
>> steps...
>> regards
>>   Arnold,DK2WT
>>
>>
>> Am 29.07.2010 13:50, schrieb   EWKehren at aol.com:
>>      
>>> Arnold
>>>   what do you use?   Bert  Kehren
>>>
>>>
>>> In a  message dated 7/29/2010  7:02:06 A.M. Eastern Daylight Time,
>>> arnold.tibus at gmx.de  writes:
>>>
>>> I  do,  and I am also interested on other    improvements!
>>>
>>> Regards,
>>>   Arnold
>>>
>>>
>>> Am 29.07.2010 12:49,   schrieb EWKehren at aol.com:
>>>        
>>>>   Hi
>>>> I think it  would be nice to have  a show of hands as to  how many are
>>>>          
>>> locking
>>>        
>>>>   a Rb to GPS and what    they  use.
>>>> Bert Kehren
>>>>
>>>>
>>>> In  a message dated  7/29/2010 4:00:31 A.M. Eastern Daylight  Time,
>>>>   phk at phk.freebsd.dk   writes:
>>>>
>>>> In  message<60EB5E7C69594F49B830463DC322EDB4 at athlon>, "Ulrich
>>>>          
>>   Bangert"
>>      
>>>
>>>        
>>>>   writes:
>>>>          
>>>>>> Uhm, isn't this  exactly where you want  to use  the
>>>>>>    still-smelling-like-brand-new-car PICTIC II with a  good DAC
>>>>>> and a microcontroller    ?
>>>>>>              
>>>>> I guess the PICTIC II is  not  very good  when  stop pulses arrive
>>>>>            
>> BEFORE
>>      
>>>>   start
>>>>          
>>>>> pulses  which is a   normal condition  if a average time interval of
>>>>>            
>> zero
>>      
>>>>> between  local  pps  and GPS pps is the   aim.
>>>>>            
>>>> So configure it to use a  standard  offset of  one  Xtal/Rb period  ?
>>>>
>>>>
>>>>          
>>>
>>>        
>>
>>      
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