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41. Re: [TowerTalk] Measuring Coax Loss (score: 1): Author: "Dan Schaaf" <dan-schaaf@att.net>; Date: Thu, 11 Feb 2010 21:00:15 -0500; I went to Comcast local dispatch office and they gave me "scrap " hardline for free. Saved them a trip to the dump. 200 ft of it. Made a 160 m RX loop with 20 ft of it. Anybody need some hardline? Be; /archives//html/Towertalk/2010-02/msg00285.html (10,906 bytes)
42. Re: [TowerTalk] Measuring Coax Loss (score: 1): Author: "Mike Besemer $WM4B$" <mwbesemer@cox.net>; Date: Thu, 11 Feb 2010 21:01:10 -0500; I don't cheap out on coax. Mine is MILSPEC RG-214... not bad stuff for 125' or so at HF. I also have plenty of sources for hardline... which I reserve for my repeater work, where it matters not only; /archives//html/Towertalk/2010-02/msg00286.html (10,318 bytes)
43. Re: [TowerTalk] Measuring Coax Loss (score: 1): Author: "Dan Schaaf" <dan-schaaf@att.net>; Date: Thu, 11 Feb 2010 21:02:25 -0500; W all set our priorities differently. Nothing wrong with that. And sometimes our living circumstances get in the way of what we want. Best Regards Dan Schaaf K3ZXL www.k3zxl.com "In the Beginning, th; /archives//html/Towertalk/2010-02/msg00287.html (38,952 bytes)
44. Re: [TowerTalk] Measuring Coax Loss (score: 1): Author: "Mike Besemer $WM4B$" <mwbesemer@cox.net>; Date: Thu, 11 Feb 2010 21:03:51 -0500; Not to mention putting a couple of kids through college... and liking to have a meal or two now and then! W all set our priorities differently. Nothing wrong with that. And sometimes our living circu; /archives//html/Towertalk/2010-02/msg00288.html (39,754 bytes)
45. Re: [TowerTalk] Measuring Coax Loss (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Thu, 11 Feb 2010 21:11:54 -0500; Hi Rick, I don't think that I have used the method that you describe. What happens when the cable length approaches a quarter wave length? Or is this only valid at a small fraction of a wave length?; /archives//html/Towertalk/2010-02/msg00289.html (11,924 bytes)
46. Re: [TowerTalk] Measuring Coax Loss (score: 1): Author: "Roger (K8RI)" <K8RI-on-TowerTalk@tm.net>; Date: Thu, 11 Feb 2010 21:44:47 -0500; As was I True, but the loss between a couple connectors and the 10 I have between the rig and top of the tower is only a couple tenths of a db, far less than they tell me it's supposed to be. I'm tal; /archives//html/Towertalk/2010-02/msg00290.html (16,493 bytes)
47. Re: [TowerTalk] Measuring Coax Loss (score: 1): Author: "Roger (K8RI)" <K8RI-on-TowerTalk@tm.net>; Date: Thu, 11 Feb 2010 22:24:10 -0500; Living here in the snow country, last night on 40 for instance. The background noise was a very steady S7. It was the kind of steady state noise where a signal just a little stronger stands out. Were; /archives//html/Towertalk/2010-02/msg00292.html (24,363 bytes)
48. Re: [TowerTalk] Measuring Coax Loss (score: 1): Author: "Roger (K8RI)" <K8RI-on-TowerTalk@tm.net>; Date: Thu, 11 Feb 2010 22:55:13 -0500; I think it's not the point of diminishing returns but rather what compromise is the individual willing to settle for. IOW would you pay $1 more per foot, $2.00, $3.00, $5.00, or where would the indiv; /archives//html/Towertalk/2010-02/msg00295.html (31,630 bytes)
49. Re: [TowerTalk] Measuring Coax Loss (score: 1): Author: "Tom Osborne" <w7why@verizon.net>; Date: Thu, 11 Feb 2010 19:55:56 -0800; HI All I went to Dish Network last week to ask a question and while I was there, asked about some surplus coax. They told me they just dumped a dumpster load that morning, so they are gonna save a bu; /archives//html/Towertalk/2010-02/msg00296.html (9,777 bytes)
50. Re: [TowerTalk] Measuring Coax Loss (score: 1): Author: "Roger (K8RI)" <K8RI-on-TowerTalk@tm.net>; Date: Thu, 11 Feb 2010 23:00:52 -0500; Probably not, but it's highly likely in the minority. But big guns, or little pistols, the overall idea is to do as much as possible with what we have and to share the knowledge as to how we've done; /archives//html/Towertalk/2010-02/msg00297.html (12,050 bytes)
51. Re: [TowerTalk] Measuring Coax Loss (score: 1): Author: "Mike" <noddy1211@sbcglobal.net>; Date: Thu, 11 Feb 2010 20:05:31 -0800; That does not matter, what does is that you can hear the difference between 0db and 3db, that's when a good station shines. Every 3db counts with low signals. Mike So... assuming (as someone suggeste; /archives//html/Towertalk/2010-02/msg00298.html (15,896 bytes)
52. Re: [TowerTalk] Measuring Coax Loss (score: 1): Author: "Roger (K8RI)" <K8RI-on-TowerTalk@tm.net>; Date: Thu, 11 Feb 2010 23:14:38 -0500; 26-27 years ago I was given a whole spool of 7/8" had line (75 ohm). It's good stuff, low loss, and connectors can be made cheaply. It took 360 some feet (IIRC) of the stuff to get to the tower on to; /archives//html/Towertalk/2010-02/msg00299.html (11,355 bytes)
53. Re: [TowerTalk] Measuring Coax Loss (score: 1): Author: "Tod -ID" <tod@k0to.us>; Date: Thu, 11 Feb 2010 21:39:17 -0700; Having inadvertently started this very long thread by pushing SEND rather than DELETE on my email I am feeling a little guilty about all the bandwidth it generated. My summary for non-technical or ne; /archives//html/Towertalk/2010-02/msg00302.html (9,431 bytes)
54. Re: [TowerTalk] Measuring Coax Loss (score: 1): Author: "Richard (Rick) Karlquist" <richard@karlquist.com>; Date: Thu, 11 Feb 2010 20:59:07 -0800; This is intended for low frequencies where the coax is much less than a quarter wave. If you can measure a quarter wave of coax, then the thing to do is measure the Q of it as a resonator, from which; /archives//html/Towertalk/2010-02/msg00303.html (10,643 bytes)
55. Re: [TowerTalk] Measuring Coax Loss (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Thu, 11 Feb 2010 21:14:48 -0800; WHile the HP spectrum analyzer has a *precision* of 0.01dB, I'll bet its uncertainty is bigger than that (0.1dB at least, maybe 0.3 to 0.5dB). If you used it for a substitution measurement (i.e. you; /archives//html/Towertalk/2010-02/msg00304.html (12,265 bytes)
56. Re: [TowerTalk] Measuring Coax Loss (score: 1): Author: "Roger (K8RI)" <K8RI-on-TowerTalk@tm.net>; Date: Fri, 12 Feb 2010 00:16:49 -0500; Not to worry, I think it developed a lot of good discussion. and...I think you have a pretty good summary below. 73 Roger (K8RI) _______________________________________________ ______________________; /archives//html/Towertalk/2010-02/msg00305.html (10,310 bytes)
57. Re: [TowerTalk] Measuring Coax Loss (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Thu, 11 Feb 2010 21:30:47 -0800; True, one needs to look at your overall goals. 3dB is the difference between 500 and 1000W..but for skywave paths, typically, you've either got propagation or you don't. If you do, 10W will work, if; /archives//html/Towertalk/2010-02/msg00306.html (12,172 bytes)
58. Re: [TowerTalk] Measuring Coax Loss (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Thu, 11 Feb 2010 21:33:46 -0800; This is why the measurement with the network analyzer (or one port analyzer) is interesting...it can "measure the length" as well as the loss. (well, the electrical length.. I don't know if you can; /archives//html/Towertalk/2010-02/msg00307.html (10,261 bytes)
59. Re: [TowerTalk] Measuring Coax Loss (score: 1): Author: jimlux <jimlux@earthlink.net>; Date: Thu, 11 Feb 2010 21:43:04 -0800; Yes.. 3dB is the difference between unreadable and barely readable against the noise floor. The difference between the 3kHz and 2.4kHz IF filter on SSB is a lot less than 3dB and readily audible on a; /archives//html/Towertalk/2010-02/msg00308.html (10,587 bytes)
60. Re: [TowerTalk] Measuring Coax Loss (score: 1): Author: "Roger (K8RI)" <K8RI-on-TowerTalk@tm.net>; Date: Fri, 12 Feb 2010 02:02:51 -0500; Not if that's your noise floor, which isn't all that uncommon up here in snow country when the wind blows. <:-)) It was S7 last night and very steady, well...night before last now. That is the defini; /archives//html/Towertalk/2010-02/msg00309.html (12,133 bytes)

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