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Total 11 documents matching your query.

1. [TowerTalk] Matching a Delta Loop (score: 1): Author: "Phil Clements" <philc@texascellnet.com>; Date: Wed, 18 Oct 2006 15:03:07 -0500; I hastily threw together a 30 meter Delta Loop this summer in order to get KH8SI in the log for a new one on CW. Using the formula, the resonant point came out 10.105 mhz (great, first try!) but the; /archives//html/Towertalk/2006-10/msg00493.html (7,600 bytes)
2. Re: [TowerTalk] Matching a Delta Loop (score: 1): Author: TexasRF@aol.com; Date: Wed, 18 Oct 2006 16:22:50 EDT; If you have some 75 ohm coax available you can build up a series matching section: 153 degrees 50 ohm coax connected to the feedpoint followed by 146.5 degrees of 75 ohm coax. You can also make a stu; /archives//html/Towertalk/2006-10/msg00495.html (8,953 bytes)
3. Re: [TowerTalk] Matching a Delta Loop (score: 1): Author: Terry Conboy <n6ry@arrl.net>; Date: Wed, 18 Oct 2006 13:54:06 -0700; A series-section matching arrangement would work well to match to 79 ohms at 10.125 MHz. Connect 4.83 feet of 50 ohm line to the feedpoint (VF=0.66) Then follow with 5.99 feet of 75 ohm line (VF=0.66; /archives//html/Towertalk/2006-10/msg00497.html (7,776 bytes)
4. Re: [TowerTalk] Matching a Delta Loop (score: 1): Author: TexasRF@aol.com; Date: Wed, 18 Oct 2006 17:15:14 EDT; Terry, I like your numbers better as they use less coax. My series match program has a flaw that I never noticed in all the years using it: inputting 79 +j.01 gives my numbers and inputting 79-j.01 g; /archives//html/Towertalk/2006-10/msg00501.html (8,868 bytes)
5. Re: [TowerTalk] Matching a Delta Loop (score: 1): Author: TexasRF@aol.com; Date: Wed, 18 Oct 2006 17:21:11 EDT; Phil, there is an additional answer to this that you may prefer: Since the antenna is already connected with 50 ohm coax, you can determine the R+j at the end of the coax and apply a series match the; /archives//html/Towertalk/2006-10/msg00502.html (9,630 bytes)
6. Re: [TowerTalk] Matching a Delta Loop (score: 1): Author: "Andrew Roos" <Andrew.Roos@poynting.co.za>; Date: Thu, 19 Oct 2006 07:46:18 +0200; A 1/4 wave section of 72 Ohm coax will give you 66 Ohms, for an SWR of 1.3. Andrew ZS6AAA I hastily threw together a 30 meter Delta Loop this summer in order to get KH8SI in the log for a new one on; /archives//html/Towertalk/2006-10/msg00518.html (8,624 bytes)
7. [TowerTalk] Matching a Delta Loop (score: 1): Author: Dennis OConnor <ad4hk2004@yahoo.com>; Date: Thu, 19 Oct 2006 05:59:11 -0700 (PDT); Or we can assume that 79/50 = SWR 1.58, which adds an additional 0.13 dB of loss... Hardly worth cutting coax for... Now, given that the impedence measurement was made at the generator end of the coa; /archives//html/Towertalk/2006-10/msg00520.html (7,933 bytes)
8. Re: [TowerTalk] Matching a Delta Loop (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Thu, 19 Oct 2006 09:21:15 -0400; For an equilateral, 1 lambda delta loop, you can find a 50 ohm, vertically polarized, solution by feeding the loop 1/3 up from one of the bottom corners. They work reasonably well. I doubt they'll ou; /archives//html/Towertalk/2006-10/msg00522.html (7,784 bytes)
9. Re: [TowerTalk] Matching a Delta Loop (score: 1): Author: K4SAV <RadioIR@charter.net>; Date: Thu, 19 Oct 2006 12:49:52 -0500; The K8UR four square would give significant amount of additional gain below 35 degrees elevation. However it is significantly more complex than an inverted vee or a loop. It gives about the same gain; /archives//html/Towertalk/2006-10/msg00527.html (9,801 bytes)
10. Re: [TowerTalk] matching a delta loop (score: 1): Author: "Jim Jarvis" <jimjarvis@verizon.net>; Date: Thu, 19 Oct 2006 16:19:52 -0400; Sorry... with the apex UP...the feedpoint impedance varies with the height of the lower leg above ground. The ones I had were no more than 10' or 15' above gnd, to produce a decent match. I'd have to; /archives//html/Towertalk/2006-10/msg00538.html (8,495 bytes)
11. Re: [TowerTalk] Matching a Delta Loop (score: 1): Author: Bill Coleman <aa4lr@arrl.net>; Date: Fri, 20 Oct 2006 23:16:26 -0400; Before I put the tower up, I had a 10/15m delta loop in the attic. Worked pretty well. I made gamma matches to feed mine. I ended up with a gamma wire the same diameter as the elements, about 4% of t; /archives//html/Towertalk/2006-10/msg00602.html (8,847 bytes)

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