[time-nuts] Looking for GPSDO for home use

Mike George mgeorge at tuffmail.us
Wed Apr 16 19:32:00 EDT 2014


Tom:

I saw you post to David on the Time Nuts list offering availability of a 
Thunderbolt.
If you have additional units available  I would be interested in one as 
well.
Let me know if you have any available and the cost.

Thanks,
Mike George
N3MUY

On 4/15/2014 14:03, Tom Van Baak wrote:
> Dave,
>
> If you're just calibrating a frequency counter you may not need a GPSDO. A simple GPS 1PPS is all you need; just measure the time from the 1PPS to the 10 MHz, wait a minute or an hour or a day and do it again. This will show you the time drift, from which you can calculate the frequency error.
>
> Still, having a 10 MHz GPSDO available is usually more convenient, so I would not talk you out of it.
>
> If you don't want to spend time to design your own GPSDO, or to build one of the dozen homebrew projects on the web, I would recommend you get a Trimble Thunderbolt. They are as turn-key as you can get, but also allow great hacking if you so choose.
>
> I have some left over from the group buy. If you're interested contact me off-list.
>
> Thanks,
> /tvb
>
> ----- Original Message -----
> From: "David Feldman" <wb0gaz at yahoo.com>
> To: <time-nuts at febo.com>
> Sent: Tuesday, April 15, 2014 8:27 AM
> Subject: [time-nuts] Looking for GPSDO for home use
>
>
>> I found this reflector after searching for GPSDO that would be suitable for individual purchase/use. Each time I found an article about GPSDO projects, that lead me to a surplus GPS module that is either no longer available, not current production, undocumented, or otherwise difficult to source. I don't mind doing my own building/integration, and am not adverse to starting with a used or suplus component, I'm not sure where to start in terms of sourcing the GPS module/antenna/etc. My main need is for something to serve as a primary frequency standard (i.e., 10 MHz output) I can use to set a voltage controlled OCXO I just installed in my (otherwise cheap chinese) frequency counter. It seems there are some modules that have/had 10 kHz output; that would work too. Even 1 PPS output seems like a workable starting point, but at the expense of a different and/or more difficult path to get to a 10 MHz reference signal I seek.
>>
>> Any advance or pointer to source (reasonable cost, whatever that means!) would be appreciated.
>>
>> Thanks!
>>
>> Dave
>> wb0gaz at yahoo.com
>>
>
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