[time-nuts] tube GPS receivers

[Bob Camp]

Hi

It's the combination of swing required for the doppler and the stability required for a simple correlator  to do it's job that is the issue. A couple ppm swing - not so hard. A few tenths of a ppb stability not so hard. Both at the same time - starting to get hard.

If this is "tube only" doing all that without varicap diodes - that gets interesting. 

Bob

On Jun 22, 2013, at 9:13 PM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

> Hi Bob,
> 
> On 06/23/2013 02:35 AM, Bob Camp wrote:
>> Hi
>> 
>> How stable a 1.023 oscillator? How much pull range on that oscillator? Hmmmm…..
> 
> The 1.57542 GHz carrier gets you to +/- 6 kHz which is about +/- 3.8 ppm, so it's not that hard to do.
> 
> Cheers,
> Magnus
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