[time-nuts] Using Thunderbolt to Discipline FE 5680A?

Chuck Forsberg WA7KGX N2469R caf at omen.com
Thu Dec 22 15:53:20 EST 2011


Why have the Arduino move a magnet when it can send frequency offset
commands out a serial port?

On 12/22/2011 12:36 PM, Don Latham wrote:
> Let's see... someone mentioned using a magnet on top of the case to
> alter the Rb lock frequency. So, put the Rb output and the Tbolt output
> into a single mixer with lopass filter, or a phase comparator, then use
> the  output through something like a picaxe or arduino implementing PID
> software to run a model aircraft servo with a magnet on the servo arm.
> Hey Presto!  :-) :-)
> Don
>
> Bob Camp
>> Hi
>>
>> To use the current crop of FE-5680A's directly with the TBolt, you would
>> have to tear it apart and get a wire into the C field circuit. If you
>> didn't
>> do that, you would have to stick a PC (or other controller) in between
>> the
>> TBolt and the Rb. As they come from the vendors, there is no voltage
>> control
>> capability in the units. There are so many flavors of this Rb that
>> anything
>> said about them only applies to some of them.
>>
>> Bob
>>
>> -----Original Message-----
>> From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
>> Behalf Of Chris Albertson
>> Sent: Thursday, December 22, 2011 12:20 PM
>> To: Discussion of precise time and frequency measurement
>> Subject: Re: [time-nuts] Using Thunderbolt to Discipline FE 5680A?
>>
>> On Thu, Dec 22, 2011 at 8:50 AM, Frederick Bray<fwbray at mminternet.com>
>> wrote:
>>> Has anyone successfully used a Thunderbolt to discipline a FE-5680A?
>>>
>>> I thought I saw a posting or site where someone disabled the 10 MHz
>>> oscillator on the Thunderbolt and used the Thunderbolt to discipline
>>> the
>>> FE-5680A.  However, I can't find it now.
>> I would not do it that way.  My plan is to leave the t-bolt as is and
>> then every 24 or so hours adjust the  FE-5680A if required to better
>> match the t-bolt.  My hope is that after some time the    FE-5680A
>> will less and less frequent adjustments.  This will be a while as my
>> FE-5680A is still in the mail.
>>
>> I think the FE-5680A has to course of adjustment to be used in the
>> "fast" control loop inside the t-bolt
>>
>>
>> Chris Albertson
>> Redondo Beach, California
>>
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>

-- 
Chuck Forsberg WA7KGX N2469R     caf at omen.com   www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
   Omen Technology Inc      "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231   503-614-0430





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