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1. [TowerTalk] 39 +j0 ohms? (score: 1): Author: "Jamie WW3S" <ww3s@zoominternet.net>; Date: Sun, 2 Dec 2018 15:07:54 -0500; trying to understand a 40m vertical, my Rigexpert analyzer has Z, X, R and C.......when I measure the vertical at 7.125 (target freq) the SWR is 1.3:1, but the Z is 50 ohms, Im told the impedance nee; /archives//html/Towertalk/2018-12/msg00013.html (7,104 bytes)
2. Re: [TowerTalk] 39 +j0 ohms? (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Sun, 2 Dec 2018 12:27:29 -0800; Where are you measuring? You'll only get the actual impedance measuring right at the feedpoint with a very short piece of coax connecting the analyzer. Now, it IS possible to transform a measurement; /archives//html/Towertalk/2018-12/msg00014.html (8,105 bytes)
3. Re: [TowerTalk] 39 +j0 ohms? (score: 1): Author: Wes N7WS <wes_n7ws@triconet.org>; Date: Sun, 2 Dec 2018 14:04:33 -0700; No, you just need to calibrate at the far end of the coax. Sent from my iPhone _______________________________________________ _______________________________________________ TowerTalk mailing list T; /archives//html/Towertalk/2018-12/msg00015.html (9,389 bytes)
4. Re: [TowerTalk] 39 +j0 ohms? (score: 1): Author: "Tim Duffy" <k3lr@k3lr.com>; Date: Sun, 2 Dec 2018 16:11:31 -0500; Jamie: Is this a full size vertical (1/4 wavelength) with a proper radial field? If the VSWR is 1.3:1 at 7125 KHz - what is the problem you are trying to solve? What frequency is X=0? 73, Tim K3LR --; /archives//html/Towertalk/2018-12/msg00016.html (10,322 bytes)
5. Re: [TowerTalk] 39 +j0 ohms? (score: 1): Author: "Jamie WW3S" <ww3s@zoominternet.net>; Date: Sun, 2 Dec 2018 16:47:44 -0500; I'm preparing for the 2 ELE DXE array.....and now, with just about 3 ft of coax, at the target freq of 7.125 mc, #1 vert measures Z=41.1, R=40.8 and X=.93 and #2 measures Z=40.8, R=40.6 and X = 3.2.; /archives//html/Towertalk/2018-12/msg00017.html (11,764 bytes)
6. Re: [TowerTalk] 39 +j0 ohms? (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Sun, 2 Dec 2018 14:43:25 -0800; Of course, assuming the analyzer can be calibrated. I've never owned or studied any of that brand, so don't know. 73, Jim _______________________________________________ _____________________________; /archives//html/Towertalk/2018-12/msg00018.html (8,168 bytes)
7. Re: [TowerTalk] 39 +j0 ohms? (score: 1): Author: WW3S <ww3s@zoominternet.net>; Date: Sun, 2 Dec 2018 21:47:25 -0500; Chuck, thank you ! Exactly what I was after....great explanation....on a side note, the array seems to be working great, quieter on receive than my previous home brew Christman type array, with great; /archives//html/Towertalk/2018-12/msg00022.html (16,236 bytes)
8. Re: [TowerTalk] 39 +j0 ohms? (score: 1): Author: "Chuck Lewis" <clewis@knology.net>; Date: Sun, 02 Dec 2018 20:30:00 -0600; Jamie, the impedance reading you are seeing now is (48.3 + j14.4); but your instructions want (46 + j12). So youre pretty close. The j term and X refer to the same thing (reactance). Impedance has t; /archives//html/Towertalk/2018-12/msg00023.html (13,926 bytes)
9. Re: [TowerTalk] 39 +j0 ohms? (score: 1): Author: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>; Date: Mon, 3 Dec 2018 10:41:23 +0000; You need to see what X shows. When X=0 that is the resonance point. It is how you know if it is long or short, or just in place. After that, while X=0 (or around), it is when you check R. That is the; /archives//html/Towertalk/2018-12/msg00027.html (9,427 bytes)

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