[time-nuts] Thunderbolt? (re simple gpsdo.)

shalimr9 at gmail.com shalimr9 at gmail.com
Fri Dec 30 10:06:43 EST 2011


Do not forget that the thunderbolt was not designed to be the best GPSDO ever, it was designed to meet a set of requirements that include a certain stability in and out of holdover over a certain temperature range and it does that quite well.

If you do not need holdover stability, you can come up with a simpler device with equivalent performance. I am not sure you can do that for what a Thunderbolt costs on eBay if you have to buy all the parts.

On the other hand, you are likely to learn quite a bit more making your own.

Didier KO4BB

Sent from my BlackBerry Wireless thingy while I do other things...

-----Original Message-----
From: Mark Spencer <mspencer12345 at yahoo.ca>
Sender: time-nuts-bounces at febo.com
Date: Thu, 29 Dec 2011 20:24:34 
To: Discussion of precise time and frequency measurement<time-nuts at febo.com>
Reply-To: Discussion of precise time and frequency measurement
	<time-nuts at febo.com>
Subject: Re: [time-nuts] Thunderbolt? (re simple gpsdo.)

One of the designs using the 10 kHz output from a Jupiter gps engine and a simple PLL to discipline an ocxo might be good starting point if suitable gps engines are still available.  There won't be much to tweak but the performance could be quite good.

My first gpsdo was a manufactured version of this concept and it consistently beats my thunder bolt from an adev perspective and there is nothing to tweak (:  



Sent from my iPad

On 2011-12-29, at 6:35 PM, Chris Albertson <albertson.chris at gmail.com> wrote:

>> The era of cheap Thunderbolts appears to be history.
>> 
> 
> What is the simplest GPSDO you can build?   There are many designs
> around but when the T-Bolts came out I think people lost interesting
> building.
> 
> I think something very simple could work.  If your local oscillator is
> at all decent it will not loose or gain full cycle in one second.  So
> I think you only need to compare the phase of the oscillator and the
> PPS.   Would an analog controller work?   I do software all day every
> day at work so it would be fun to build an analog computer for a
> change.
> 
> 
> Chris Albertson
> Redondo Beach, California
> 
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