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

Don Latham djl at montana.com
Thu Dec 22 15:36:39 EST 2011


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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-- 
"Neither the voice of authority nor the weight of reason and argument
are as significant as experiment, for thence comes quiet to the mind."
R. Bacon
"If you don't know what it is, don't poke it."
Ghost in the Shell


Dr. Don Latham AJ7LL
Six Mile Systems LLP
17850 Six Mile Road
POB 134
Huson, MT, 59846
VOX 406-626-4304
www.lightningforensics.com
www.sixmilesystems.com






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