LF Propagation thoughts (and antenna, too)]
Sat, 26 Feb 2000 17:47:20 -0500
Larry Kayser wrote:
> Greetings all:
> I have been using the GPS data via an old Garmin OEM receiver for some time
> now to trigger accurate time chirps on a LDE experiment I run here.
> First you program the receiver to send only this data stream, GPRMC.
> Then you look for the date and time of the second before you want to begin
> transmitting. When you see the next "$" (dollar sign character) drop into
> the transmit sequence. The offset, a small number of Milliseconds, will be
> a constant offset.
> For one or more minute transmission periods the error is trivial.
> I have had no problems with the GPS receiver being bothered by high power
> RF, nor have I had many periods when the GPS dropped out of sync even though
> part of the sky at my transmit location is obscured.
> The OEM GPS receivers were quite inexpensive a while back, but I see new GPS
> receivers with a data connection now for under $100. US$.
> Good Luck