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Total 21 documents matching your query.

1. [CQ-Contest] Contest QTH (score: 1): Author: Lew Sayre <w7ew@arrl.net>; Date: Fri, 21 May 2010 18:13:29 -0700; Yo, OK, so a salt water take off is good for Tx and Rx. What about an archipelago or salt water bay or salty straight where you'd have 20-30 miles of sea water before running into land? You think tha; /archives//html/CQ-Contest/2010-05/msg00145.html (6,809 bytes)
2. Re: [CQ-Contest] Contest QTH (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sat, 22 May 2010 05:44:56 -0400; Hi Lew - an eyeball at the angles involved suggests that most reflections will occur well within the 20-30 miles. HFTA only uses terrain out to about 4000 meters. Reduced salinity would have some eff; /archives//html/CQ-Contest/2010-05/msg00146.html (8,532 bytes)
3. Re: [CQ-Contest] Contest QTH (score: 1): Author: David Gilbert <xdavid@cis-broadband.com>; Date: Sat, 22 May 2010 21:47:39 -0700; Hi, Pete. I don't think there is any kind of formal limit in HFTA. The terrain slopes rapidly down eastward from my QTH at roughly 15% for about a half mile, maybe 8-10% after that for a couple of mi; /archives//html/CQ-Contest/2010-05/msg00151.html (7,839 bytes)
4. Re: [CQ-Contest] Contest QTH (score: 1): Author: Pete Smith <n4zr@contesting.com>; Date: Sun, 23 May 2010 09:44:19 -0400; I hope that Dean will chime in here, because I recall an e-mail conversation a few years ago in which he said he felt that About 3 miles was a practical limit. I once built a terrain file that had to; /archives//html/CQ-Contest/2010-05/msg00152.html (9,815 bytes)
5. Re: [CQ-Contest] Contest QTH (score: 1): Author: k3bu@optimum.net; Date: Sun, 23 May 2010 15:45:38 +0000 (GMT); Yo, yo I was awaken by experiences of Team Vertical exploits at the beach and their results by just using "fishing pole" antennas. To verify their fishing stories I ventured to Cape Hatteras with 10m; /archives//html/CQ-Contest/2010-05/msg00153.html (10,517 bytes)
6. Re: [CQ-Contest] Contest QTH (score: 1): Author: Denis Pochuev - K7GK <k7gk@hotmail.com>; Date: Sun, 23 May 2010 11:02:18 -0700; Pete, The exact formula for the angle you described is atan((h_t - h_a)/d_f), where h_t is the height of the terrain in feet, h_a is the height of the antenna in feet and d_f is the distance in feet.; /archives//html/CQ-Contest/2010-05/msg00154.html (10,143 bytes)
7. Re: [CQ-Contest] Contest QTH (score: 1): Author: "Hank Lonberg" <kr7x1@verizon.net>; Date: Sun, 23 May 2010 09:03:20 -0700; Actually there is a limit. I believe it is 113 +- discrete data points. Hank / KR7X --Original Message-- From: cq-contest-bounces@contesting.com [mailto:cq-contest-bounces@contesting.com] On Behalf O; /archives//html/CQ-Contest/2010-05/msg00155.html (9,087 bytes)
8. Re: [CQ-Contest] Contest QTH (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Sun, 23 May 2010 16:51:10 -0400; While salt water is definitely good for verticals, but it doesn't help horizontally polarized antennas like Yagis. For the low bands (160/80) where construction of large Yagis is a mechanical challen; /archives//html/CQ-Contest/2010-05/msg00156.html (7,732 bytes)
9. [CQ-Contest] Contest QTH (score: 1): Author: Dave Mueller N2NL <n2nl@n2nl.net>; Date: Sun, 23 May 2010 21:33:02 -0400; From W4ZV: I can vouch for Bill's statement. For the last three years, I lived in Key West, Florida, and used vertical antennas for all bands, 160-10m. These verticals were located over salt water, o; /archives//html/CQ-Contest/2010-05/msg00157.html (10,786 bytes)
10. Re: [CQ-Contest] Contest QTH (score: 1): Author: k3bu@optimum.net; Date: Mon, 24 May 2010 02:20:05 +0000 (GMT); W4ZV: Not true. Even horizontally polarized antennas gain from the salt water. Besides enhancement from the ground, reflection conditions in the immediate vicinity of the array, signals at the salt w; /archives//html/CQ-Contest/2010-05/msg00158.html (8,716 bytes)
11. Re: [CQ-Contest] Contest QTH (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Mon, 24 May 2010 07:31:42 -0400; EZNEC shows minor improvement for horizontal polarization over salt water but it's at high angles...not low angles as is the case for vertical polarization. At 14 degrees TOA, there's a 0.51 dB adva; /archives//html/CQ-Contest/2010-05/msg00163.html (9,292 bytes)
12. [CQ-Contest] Contest QTH (score: 1): Author: "James Cain" <jamesdavidcain@gmail.com>; Date: Mon, 24 May 2010 16:36:20 -0400; I am four miles west of the edge of Great Bay, an Atlantic Ocean inlet. Can I run a ground wire there to get the salt water effect, or do I need to go another three miles, across the bay to the actua; /archives//html/CQ-Contest/2010-05/msg00164.html (8,365 bytes)
13. [CQ-Contest] Contest QTH (score: 1): Author: steve.root@culligan4water.com; Date: Mon, 24 May 2010 21:39:02 +0000; I'm about 1000 miles from any saltwater. So my verticals must be, what, 40 db down? Oh well, it keeps things interesting. 73 Steve K0SR _______________________________________________ CQ-Contest mail; /archives//html/CQ-Contest/2010-05/msg00165.html (7,970 bytes)
14. [CQ-Contest] Contest QTH (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Mon, 24 May 2010 18:24:04 -0400; K1TN: inlet. Can I run a ground wire there to get the salt water effect, or do I need to go another three miles. I know you're being facetious but I've actually studied this. Based on ancedotal evide; /archives//html/CQ-Contest/2010-05/msg00166.html (7,460 bytes)
15. Re: [CQ-Contest] Contest QTH (score: 1): Author: "Jim Neiger" <n6tj@sbcglobal.net>; Date: Mon, 24 May 2010 17:49:40 -0700; It's a good thing I didn't know all of this before plugging into all of those horizontally polarized antennas 20 ft from the edge of Ascension Island. Just think how much louder my puny signal would'; /archives//html/CQ-Contest/2010-05/msg00167.html (10,386 bytes)
16. Re: [CQ-Contest] Contest QTH (score: 1): Author: "N7mal" <n7mal@citlink.net>; Date: Tue, 25 May 2010 04:16:45 -0800; Jim it's to bad all those smart guys didn't read the last sentence of the original posting. The saltwater is not a factor in this equation,,, it's the FT5XO callsign that made the antennas look like; /archives//html/CQ-Contest/2010-05/msg00169.html (11,394 bytes)
17. Re: [CQ-Contest] Contest QTH (score: 1): Author: "Richard J. Norton" <richardjnorton@gmail.com>; Date: Tue, 25 May 2010 07:13:25 -0700; The "Team Vertical" prime movers, K2KW and N6BT, have answered this question. A good rule of thumb is the antennas should be no more than a quarter wavelength from the salt water. More information is; /archives//html/CQ-Contest/2010-05/msg00174.html (10,758 bytes)
18. [CQ-Contest] Contest QTH (score: 1): Author: Zoltan Szoke <ha5pp_zoli@yahoo.com>; Date: Tue, 25 May 2010 04:47:31 -0700 (PDT); Hi Guys, First of all, I am not an antenna guru of course (even ...), but I love to play with EZNEC, MMANA and HFTA. :) I think that is difficult to write about good antennas, good contest QTH, bea; /archives//html/CQ-Contest/2010-05/msg00175.html (9,517 bytes)
19. Re: [CQ-Contest] Contest QTH (score: 1): Author: k3bu@optimum.net; Date: Tue, 25 May 2010 20:52:47 +0000 (GMT); Maybe déjà vu of déjà vu, but my further observations by "my own lying eyes" over the "unshakable truth" of software models tells me otherwise. There is much more to the salty beach than dBs in soft; /archives//html/CQ-Contest/2010-05/msg00179.html (11,436 bytes)
20. Re: [CQ-Contest] Contest QTH (score: 1): Author: Bill Tippett <btippett@alum.mit.edu>; Date: Tue, 25 May 2010 22:26:55 -0400; The "Team Vertical" prime movers, K2KW and N6BT, have answered this question. A good rule of thumb is the antennas should be no more than a quarter wavelength from the salt water. More information is; /archives//html/CQ-Contest/2010-05/msg00180.html (10,399 bytes)

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