Posted by
charliedelta on
Dec 02, 2006; 10:27pm
URL: http://elecraft.85.s1.nabble.com/OT-Wullenweber-Array-tp441455.html
-----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.htmhttp://www.tcibr.com/spectrum-monitoring-hf.htmlRhode 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.htmCraig
VK3HE
-----BEGIN PGP SIGNATURE-----
Note: This signature can be verified at
https://www.hushtools.com/verifyVersion: 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=480Get the best prices on SSL certificates from Hushmail
https://www.hushssl.com?l=485_______________________________________________
Elecraft mailing list
Post to:
[hidden email]
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.htmElecraft web page:
http://www.elecraft.com