Passive UHF TV repeaters were in use in Italy too. Nowadays, for the DVB-T TV, active gap-fillers are used instead. Active gap-fillers are same-channel repeaters with the necessary, sophisticated echo suppression technique. We have developed our echo suppression signal processor on a Xilinx Virtex5 FPGA: maybe something similar may be done for the GPS CDMA.
On Thu, Apr 12, 2012 at 3:29 PM, Alan Melia <alan.me...@btinternet.com>wrote: > If the isolation is good and the "clear view" signal is reasonably strong, > the passive system works well in hangers, metalclad warehouses, ferry lorry > decks. > The passive system in the UK used to be refered to as the "Matlock > Repeater". > > Alan > G3NYK > > ----- Original Message ----- > From: "Michael Baker" <mp...@clanbaker.org> > To: <time-nuts@febo.com> > Sent: Thursday, April 12, 2012 2:05 PM > Subject: [time-nuts] Re-radiating a GPS signal...?? > > > > Time-nutters-- > > > > So-- How do GPS signal re-radiators work? > > > > How do you place a GPS antenna on top of a building, > > pick up the signal with an LNA, amplify it to re-transmit > > on an inside antenna without the amplified re-transmitted > > signal getting back into the roof-top receiving antenna? > > > > I can see circumstances where a huge metal building > > (aircraft hangar?) might provide enough isolation to > > prevent problems, but in many cases I wonder about it... > > ---------------------------- > > > > As an aside note-- I recall seeing, many years ago, a totally > > passive TV signal repeater on top of a tall hill in mountainous > > territory relaying a TV station signal to some homes in a valley > > just below. The passive repeater consisted of an array of > > high-gain UHF yagis pointing to the 40 mile distant TV station tower. > > The yagi array was coupled to another set of high-gain yagi > > antennas pointing down to the homesites in the valley. I was > > told that it worked pretty well. > > > > Mike Baker > > ---------------------- > > > > _______________________________________________ > > time-nuts mailing list -- time-nuts@febo.com > > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.