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41. Re: [TowerTalk] CM Choke (score: 1): Author: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>; Date: Tue, 10 Oct 2017 16:23:09 +0000; Jim, I´ve seen someone else making a S11 measurement for CM choke? Is that correct? http://www.lb3hc.net/archives/1358 I always use S21. Thank you 73, Maximo ________________________________ De: Towe; /archives//html/Towertalk/2017-10/msg00097.html (9,966 bytes)
42. Re: [TowerTalk] CM Choke (score: 1): Author: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>; Date: Wed, 11 Oct 2017 10:31:33 +0000; Hi Jim, I've been using that fixture, with a voltage divider, when measure CMRR over a 4:1 Guanella, so I can try again for CM over a choke. This is the adaptor used, with SMD resistors; http://www.p; /archives//html/Towertalk/2017-10/msg00100.html (10,712 bytes)
43. Re: [TowerTalk] CM Choke (score: 1): Author: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>; Date: Thu, 12 Oct 2017 09:44:31 +0000; What happened to me at the beginning was my mistake (and lack of knowledge) regarding the units to take into account. I am using a VNA Master from Anritsu (MS2024A) and it can't show Z, R or X, neith; /archives//html/Towertalk/2017-10/msg00118.html (13,496 bytes)
44. Re: [TowerTalk] CM Choke (score: 1): Author: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>; Date: Fri, 13 Oct 2017 16:52:50 +0000; Beginner question; My Anritsu VNA has the option to save in the memory a trace and then it can perform basic trace maths (minus, plus, etc). What if... I do the full S21 two ports SOL calibration, th; /archives//html/Towertalk/2017-10/msg00167.html (11,747 bytes)
45. Re: [TowerTalk] CM Choke (score: 1): Author: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>; Date: Fri, 13 Oct 2017 19:24:30 +0000; Yes, that is what i meant; short open load through. But to be able to test different chokes, I use a couple of short cables with alligators. I can´t do the SOLT with those alligators, so I guess that; /archives//html/Towertalk/2017-10/msg00178.html (11,187 bytes)
46. Re: [TowerTalk] rotor @ 200m distance (score: 1): Author: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>; Date: Sat, 14 Oct 2017 20:16:28 +0000; Hi all, Actually there are other options based on to install a remote controller on the mast/tower, then control remotely by Ethernet, Wifi, FibreOptic, etc. One of those options is the K3NG system:; /archives//html/Towertalk/2017-10/msg00219.html (10,767 bytes)
47. Re: [TowerTalk] VNA (score: 1): Author: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>; Date: Tue, 31 Oct 2017 11:42:54 +0000; Hi Neal, If you would like to use the VNA "on the field", you can consider consider the KC901S+: http://www.deepace.net/kc901s/ It is a two ports VNA, high dynamic range, up to 4 GHz, and it is porta; /archives//html/Towertalk/2017-10/msg00564.html (9,888 bytes)
48. Re: [TowerTalk] VNA (score: 1): Author: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>; Date: Tue, 31 Oct 2017 12:26:33 +0000; I guess; For bench work only, used with PC, VNWA is best option actually. For bench AND field use (no PC needed), KC901S+ is best and more completed. It is like a VNWA with battery and screen, up to; /archives//html/Towertalk/2017-10/msg00567.html (12,195 bytes)
49. Re: [TowerTalk] VNA (score: 1): Author: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>; Date: Tue, 31 Oct 2017 13:54:40 +0000; I guess; For bench work only, used with PC, VNWA is best option actually. For bench AND field use (no PC needed), KC901S+ is best and more completed. It is like a VNWA with battery and screen, up to; /archives//html/Towertalk/2017-10/msg00570.html (9,540 bytes)
50. Re: [TowerTalk] VNA (score: 1): Author: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>; Date: Wed, 1 Nov 2017 10:36:35 +0000; Norm, I am actually selling one of those VNA Master; https://www.ebay.com/itm/222672633655 73, Maximo Bought an Anritsu S113b on the bay. Total with new battery, OSL cal kit and charger was less than; /archives//html/Towertalk/2017-11/msg00003.html (13,154 bytes)
51. Re: [TowerTalk] Modeling multiband Yagi's (score: 1): Author: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>; Date: Wed, 1 Nov 2017 10:39:03 +0000; Anyone has the model file for the MA5B antenna? Thanks 73, Maximo Hi Don, This paragraph below illustrates only one of the many challenges we face when attempting to model an antenna like this. We mu; /archives//html/Towertalk/2017-11/msg00004.html (9,460 bytes)
52. Re: [TowerTalk] Yagi Optimizing Software (score: 1): Author: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>; Date: Mon, 20 Nov 2017 17:28:27 +0000; Hi Ray, You can use the well know 4NEC2. It is freeware and has a very good optimizing engine (I personally like the "Evolve" routine). http://www.qsl.net/4nec2/ In order to use the optimization engi; /archives//html/Towertalk/2017-11/msg00198.html (10,241 bytes)
53. Re: [TowerTalk] Yagi Optimizing Software (score: 1): Author: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>; Date: Mon, 20 Nov 2017 18:20:42 +0000; It is quite funny to see how in the states side most/all hams use Eznec. And in EU most use Mmana (entry and medium level) and 4NEC2 (medium and high level). Some EU hams use Eznec as well. By the wa; /archives//html/Towertalk/2017-11/msg00201.html (10,896 bytes)
54. Re: [TowerTalk] Feeding a quad (score: 1): Author: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>; Date: Wed, 22 Nov 2017 10:13:08 +0000; Hi all, 1/4 wavelenght with 75 OHm coax is a 2:1 impedance transformer. Dan's article is about the effects of the unused bands. All those pigtails from the quad to the remote switch are affecting ove; /archives//html/Towertalk/2017-11/msg00211.html (11,710 bytes)
55. Re: [TowerTalk] common mode chokes, baluns and multiband doublets (score: 1): Author: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>; Date: Tue, 12 Dec 2017 08:21:42 +0000; Hi Jim, <On the basis of <that work, I do not believe that it is practical to effectively choke <any badly matched antenna at any power level above 100W, and even at <100W it's easy to fry a choke. S; /archives//html/Towertalk/2017-12/msg00143.html (14,808 bytes)
56. Re: [TowerTalk] common mode chokes, baluns and multiband doublets (score: 1): Author: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>; Date: Tue, 12 Dec 2017 09:45:27 +0000; I see. So, don't use dodgy aerials. One aerial could match is the 42m loop (138 ft), which offers good match in four bands easily. (next image is a close example, not exact antenna) https://s3.amazon; /archives//html/Towertalk/2017-12/msg00145.html (14,155 bytes)
57. Re: [TowerTalk] common mode chokes, baluns and multiband doublets (score: 1): Author: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>; Date: Wed, 13 Dec 2017 06:37:18 +0000; Hi Bill, <So... even if my guess is right (about imbalance creating a common mode path for noise), designing a choke to solve the problem is very difficult. Yo don't need to. Someone else already did; /archives//html/Towertalk/2017-12/msg00176.html (12,585 bytes)
58. Re: [TowerTalk] Another way to make a CM choke ? (score: 1): Author: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>; Date: Fri, 15 Dec 2017 06:49:17 +0000; To convert those Mag and Phase values to Complex Impedance (aka Choke Impedance) you can use next calculator (Excel spreadsheet): http://www.puertobalsillas.com/radio/Balun_Guanella_4_1/Calculadora_I; /archives//html/Towertalk/2017-12/msg00194.html (11,514 bytes)
59. [TowerTalk] Jim W7EJ-CN2R SK (score: 1): Author: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>; Date: Tue, 19 Dec 2017 20:54:30 +0000; Hi all, Apologizes for the off topic. I´ve just been told Jim W7EJ has passed away. It was a heart attack. R.I.P. 73, Maximo - EA1DDO _______________________________________________ _________________; /archives//html/Towertalk/2017-12/msg00214.html (6,848 bytes)
60. [TowerTalk] Measuring Common Mode Choke with Anritsu VNA (score: 1): Author: Máximo EA1DDO_HK1H <ea1ddo@hotmail.com>; Date: Sat, 30 Dec 2017 20:41:35 +0000; Hi all, I have in my hands a very nice device called "VNA Master" from Anritsu, model MS2025B. The thing is I am trying to measure a Common Mode choke with this VNA, using S21 mode on the braid of a; /archives//html/Towertalk/2017-12/msg00229.html (8,054 bytes)

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