-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 The Wullenweber Array is a white elephant by todays standards. Arrays like these are being replaced by modern DSP DF arrays. Modern DF arrays can fix a position from a single location. Modern DF arrays measure the phase differences very accurately and can use the phase difference to obtain directivity and azimuth. However many of these Wullenweber arrays have been converted as antennas for use by modern DF DSP processing systems.
The bigger the DF arrays diameter the greater the accuracy. With a modern DSP DF array on a 8 meter diameter circle you can easily achieve 1 degree of accuracy. Something like the Wullenweber array fed with modern DSP processing can reduce that accuracy down to .1 degree accuracy. However reliable results from 1 to 30 mhz are obtained using 50 meter diameter antennas using either crossed loops or active short verticals. The DSP software alogorhythms used are called MUSIC and ESPIRIT, its very interesting stuff. http://www.monteriallc.com/almos/almos_hf_feat.htm http://www.tcibr.com/spectrum-monitoring-hf.html Rhode and Schwartz makes some excellent equipment as well. To keep this topic Elecraft related, you can read here how to use 2 K2's as a phase locked receiver to do your own DSP directivity experiments. With the advent of cheap SFDR radios we too will soon be able to build 1 degree accurate DSP correlative arrays in our backyards, assuming you have the space! http://www.pa0sim.nl/index.htm Craig VK3HE -----BEGIN PGP SIGNATURE----- Note: This signature can be verified at https://www.hushtools.com/verify Version: Hush 2.5 wpwEAQECAAYFAkVx/bcACgkQFO3Fz3YpTj12jgP+IEGD/RckK9LCRYfwjf4bKbCRNE/i hp+TJ2R6kSJbKV3hGEcnQHiqUZsyQipjyXWbDLRa7qYUEUWoJIg3qz7DGanApr10WQC4 nBAJPW4Vh+6NMPCw3ee6tSP5aNyxejSidWJQ3E4TV7ax2tMiJLf2+IPprSE7HILMBxLN KJhnd1g= =qNsd -----END PGP SIGNATURE----- Concerned about your privacy? Instantly send FREE secure email, no account required http://www.hushmail.com/send?l=480 Get the best prices on SSL certificates from Hushmail https://www.hushssl.com?l=485 _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
