This is a great discussion. I have been trying to decide the best compromise between optimal reception and safety. Here in Boulder afternoon thunder stormers are often a daily occurrence. I cannot afford to learn from my mistakes on this one. Thomas Knox
> Date: Wed, 11 Apr 2012 22:37:06 +0200 > From: [email protected] > To: [email protected] > Subject: Re: [time-nuts] Best location for a GPS antenna...? > > On Wed, 11 Apr 2012 22:06:06 +0200 > "Andrea Baldoni" <[email protected]> wrote: > > > On Wed, Apr 11, 2012 at 10:19:40AM -0400, Bob Bownes wrote: > > > > > I do like the optical isolation suggestion. While less than optimal, > > > perhaps the easiest solution is not to put the isolation between the > > > t'bolt > > > and the antenna, but to put the isolation between the t'bolt and the > > > distribution amplifier. > > > > By the way, would it be possible to retransmit the GPS signal to isolate it? > > > > I mean, rx external antenna -> preamp -> tx directional internal antenna -> > > big > > air gap -> rx directional internal antenna -> receiver. > > The preamp would not be so power hungry as the full thunderbolt and maybe > > it could be powered via a magnetic link (or a little solar panel with a > > lamp illuminating it). > > Yes it would be. What you basically would need is to have a LNA, > a bandpass filter and something that converts the voltage into > light with very little noise. I think it would be easiest to down > mix it first to 100MHz or so, then modulate a laser diode. In the > house you'd have to mix it up to 1.5GHz again, of course. > > I have no clue whether that is feasible from the noise this whole > circuitry will add or whether it would add so much noise that the > receiver would have no chance... > > Attila Kinali > -- > Why does it take years to find the answers to > the questions one should have asked long ago? > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
