[time-nuts] TBolt - Rubidium

Bob Camp lists at rtty.us
Wed Jul 28 21:52:58 EDT 2010


I think there are some significant hurdles to overcome with a TBolt directly driving a Rb. The 
TBolt assumes it can pull the oscillator pretty far in order to align the pps signals. It also looks like the internal math may not be very happy with Rb sensitivities. I think better results will be had with a loop between the TBolt OCXO and the Rb.


On Jul 28, 2010, at 8:11 PM, Neville Michie <namichie at gmail.com> wrote:

> Hi,
> I am very slowly putting together a LPRO with a thermal bootstrap temperature control and clean power supplies (in a separate box).
> The LPRO is on a 1/4 inch aluminium plate with fins on the other side. The LPRO and plate are in a foam plastic insulation jacket.
> A small brushless DC fan on the back of the box will suck air over the fins and it is used to control the temperature of the plate mounting the LPRO.
> It seems to hold temperature to about 1/10 degree. The unit is going into a steel box to further reduce the ambient magnetic flux.
> The frequency trim of the LPRO is a pair of trim pots (coarse and fine) with a quality voltage reference.
> Initially a phase detector and chart recorder will be used with a TBolt to set the frequency of the LPRO.
> However what I would like to do is use a TBolt to discipline the LPRO so that short and long term accuracy was maximised.t
> Has anyone set up an LPRO with a TBOLT?
> How was it done? Was it successful?
> cheers, Neville Michie
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