[time-nuts] SE880 GPSDO

[Attila Kinali]

On Thu, 28 Apr 2016 23:22:24 +0200
Attila Kinali <attila at kinali.ch> wrote:

> > Thanks Attila, I know how to build a transmitter and a receiver, and now 
> > is more clear the system you designed. But as I will propose this system 
> > to an astro club, and in this astro club there's the possibility that 
> > not all would have a radio license, I need something "free-to-play", if 
> > it concern.
> 
> Ok.. that's quite some constraint. This rules out any kind of transmission.


Here another crazy idea:

If you can ensure line of sight between stations, you can use a
laser link between them. Modulate the laser with an RF signal in the
10-100MHz range. Use this on the receiver side to lock the OCXO.
Proceed as before...

This approach should be fairly simple to build, but needs some care
to ensure that you are not endangering anyone with the laser beam.
Other than that, you don't need a license for running such a system.
There have been hobbyist laser communication links around for a couple
of years, though i would advise to check the designs carfully as some
of them have EMI and other problems that the original designers and users
didn't care about.


			Attila Kinali


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