[time-nuts] tube GPS receivers

Bob Camp lists at rtty.us
Sat Jun 22 20:35:05 EDT 2013


Hi

How stable a 1.023 oscillator? How much pull range on that oscillator? Hmmmm…..

Bob

On Jun 22, 2013, at 8:20 PM, Magnus Danielson <magnus at rubidium.dyndns.org> wrote:

> Hi Bob,
> 
> On 06/23/2013 02:06 AM, Bob Camp wrote:
>> Hi
>> 
>> Well if the chip rate is at or above 1 MHz, a wavelength is 300 meters or less. A 1 KM error is probably a bit to large.
> 
> A tube-channel to keep tracking within a chip does not seem too hard. Utilizing that precision for the rest of the calculation is a challenge.
> 
> Each channel would naturally have their own 1.023 MHz crystal oscillator, tweaked by the feedback loop control. That part would be pretty straight-forward. There also needs to be a carrier oscillator for final carrier removal.
> 
> Doing this beast in transistors would be enough challenge and a good exercise in itself.
> 
> Cheers,
> Magnus
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