[time-nuts] PN sequence generation using GPS

[Bob Camp]

In the case of VHF, the link distance isn't all that far. Take your transmit clock and put a one shot after it. Put a pot on the one shot and adjust it for minimum "noise" on the RX signal. Very much like a fine tune knob. Low tech - yup. Ham type solution - yes indeed. 

Bob

On Feb 22, 2011, at 9:06 PM, Chris Albertson wrote:

> On Tue, Feb 22, 2011 at 3:52 PM, Hal Murray <hmurray at megapathdsl.net> wrote:
> 
>> A PPS signal from a GPS would provide a nice way to get started, but it needs
>> a correction for the speed-of-light delay.  I don't know if finding that
>> delay would be easier or harder than traditional methods for getting the
>> receiver in sync.
> 
> Even in the best case there you have line of sight how do you know the
> distance to the transmitter unless you know the location?   Then if
> there is  bounces off the ionosphere or "wrong way" paths using the
> longer of the two great circle paths. It gets very much harder
> 
> I think GPS can help by using it to control the transmitter and to set
> the receiver frequencies but the "phase" of the frequency hop clock is
> determined by the time of flight of the signal, something a receiver
> can't know in advance
> 
> 
> 
> -- 
> =====
> Chris Albertson
> Redondo Beach, California
> 
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