In message <[EMAIL PROTECTED]>, Brooke Clarke writes: >Hi Poul: > >What is a "Frame rate cyclic averaging buffer"? Is this where you use >a GRI generator to trigger sampling the incoming signal?
It is a buffer which can hold one FRI worth of samples into which I average the received signal. In other words, for a 1Msps and 9660 GRI, it will be: 9660 * 10 * 2 = 193200 samples long >I've found that the quality of LORAN-C for timing depends on how close >you are to the transmitter. When in the 100 mile range the quality is >equal to better than GPS, but when it's many hundreds of miles there's a >lot of variation. Yes, the skywave at night is the killer problem. >I'm attaching a gif of the spectrum here from 0 to 200 kHz that goes >with the web page: >http://www.pacificsites.com/~brooke/Spec_0002.shtml Looks very typical. Try this: set a pulse generator to the gri-rate of a nearby LORAN-C chain. Connect it to the external sync trigger of your spectrum analysator Then set it for start=100khz, stop=100khz, bandwidth=10khz and video averaging (or whatever it's called) You should be able to see the loran-C pulses quite clearly. Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [EMAIL PROTECTED] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts