In message <4b00796d.6030...@rubidium.dyndns.org>, Magnus Danielson writes: >Robert Atkinson wrote:
>The directional antenna needs to have their directional lobes towards >each sat being tracked. If you try put the nulls towards the jammers >then you need to have a fair knowledge of where it is. The phased array antennas does not operate in CW mode. Once you have sat lock, you can operate the antennas in time-gate mode, and only sampling each bird in a very narrow time window & frequency band around the code-sign-change event and doppler frequency. That still does not reduce your antenna to a single beam, certainly not if you only have 7 elements in 2D config, but for any moving platform, that will make the 'sidelopes' swinging all over the place, thus attenuating the jammer but not the intended bird. And yes, this is not simple, but 97W ought to do it. For a fixed location receiver, Pos-Hold mode is pretty efficient, in particular if running of a known stable clock. Poul-Henning -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | 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 To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.