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1. [TowerTalk] Coax Loss (score: 1): Author: "Jim Miller KG0KP" <JimMiller@STL-OnLine.Net>; Date: Thu, 4 Feb 2010 10:38:27 -0600; I have struggled with this and have seen it both ways. Take an example of 100 feet of some coax at 5 db loss. Is the loss at 200 feet 8 db or is it 10 db ???? And is the loss at 50 feet 2 db or 2.5 d; /archives//html/Towertalk/2010-02/msg00108.html (6,784 bytes)
2. Re: [TowerTalk] Coax Loss (score: 1): Author: "Gene Smar" <ersmar@verizon.net>; Date: Thu, 04 Feb 2010 12:19:49 -0500; Jim: I understand your confusion: Twice as long = 3 dB more loss, right? But the loss figures for coax is given in dB per 100 feet (or meters) at a given frequency. That is, if a particular coax has; /archives//html/Towertalk/2010-02/msg00109.html (8,818 bytes)
3. Re: [TowerTalk] Coax Loss (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 04 Feb 2010 09:25:23 -0800; At 200 ft it's 10 dB and 2.5 dB at 50 ft. Loss is dB per unit length of cable. So if you double the length, you double the loss. The "rules of thumb" for 3 dB is that double (or half) the power is 3; /archives//html/Towertalk/2010-02/msg00110.html (8,290 bytes)
4. Re: [TowerTalk] Coax Loss (score: 1): Author: Dan Zimmerman N3OX <n3ox@n3ox.net>; Date: Thu, 4 Feb 2010 12:26:24 -0500; 10dB 2.5dB dB/100ft is a strange type of unit but since the loss has an exponential dependence on length, it makes sense. P(x) = P_o * 10^{-a*x} where a is an attenuation constant per unit length in; /archives//html/Towertalk/2010-02/msg00111.html (8,732 bytes)
5. Re: [TowerTalk] Coax Loss (score: 1): Author: Dan Zimmerman N3OX <n3ox@n3ox.net>; Date: Thu, 4 Feb 2010 12:36:21 -0500; Jim, of course you gave the right answer overall, and of course you meant you "double the dB loss" but this sentence is the crux of the issue, so I want to expand with a few examples. You don't "doub; /archives//html/Towertalk/2010-02/msg00112.html (8,579 bytes)
6. Re: [TowerTalk] Coax Loss (score: 1): Author: "Gary Schafer" <garyschafer@comcast.net>; Date: Thu, 4 Feb 2010 13:01:45 -0500; To add to the confusion, there is free space loss that is an additional 6 dB every time you double the distance. 73 Gary K4FMX _______________________________________________ ________________________; /archives//html/Towertalk/2010-02/msg00113.html (8,940 bytes)
7. Re: [TowerTalk] Coax Loss (score: 1): Author: "Marlon K. Schafer" <ooe@odessaoffice.com>; Date: Thu, 4 Feb 2010 09:56:41 -0800; Hiya Jim, That'll really depend on a number of factors. What frequency are you using? What kind of cable is involved? Here's a very slick calculator from www.timesmicrowave.com. Almost all of the coa; /archives//html/Towertalk/2010-02/msg00114.html (9,371 bytes)
8. Re: [TowerTalk] Coax Loss (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 04 Feb 2010 10:05:49 -0800; RIGHT! Thanks for the clarification. 73, Jim K9YC _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http:; /archives//html/Towertalk/2010-02/msg00116.html (8,335 bytes)
9. Re: [TowerTalk] Coax Loss (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 04 Feb 2010 10:25:35 -0800; The frequency and cable construction determine the loss at a given frequency. The loss in dB is still proportional to the length of the cable. If you know the loss in dB at the frequency you care abo; /archives//html/Towertalk/2010-02/msg00117.html (8,663 bytes)
10. [TowerTalk] Coax Loss (score: 1): Author: "Wilson Lamb" <infomet@embarqmail.com>; Date: Thu, 4 Feb 2010 14:06:59 -0500; This might be a little easier if we remember that the dB expression refers to a multiplication. 10 dB loss means you multiply by 0.1. Thinking of it this way, and remembering that multiplication is a; /archives//html/Towertalk/2010-02/msg00120.html (8,544 bytes)
11. [TowerTalk] Coax Loss (score: 1): Author: "Paul Young" <paul@g0hwc.com>; Date: Thu, 04 Feb 2010 11:11:26 -0800; Hi all, here is a good site with a coax loss calculator http://whwestlake.110mb.com/ Paul G0HWC Website: http://www.g0hwc.com AirNav LIVE: http://www.g0hwc.com/airnav.html Skype: paul.g0hwc _________; /archives//html/Towertalk/2010-02/msg00121.html (8,212 bytes)
12. [TowerTalk] coax loss (score: 1): Author: "Danny Pease" <dpease@adams.net>; Date: Fri, 12 Feb 2010 08:21:28 -0600; For all you that feel 3 dB loss isn't worth worrying about, keep thinking along that line. It makes it a bit easier for me to break some of the pileups. :-) I enjoy VHF and UHF weak signal work and m; /archives//html/Towertalk/2010-02/msg00315.html (9,011 bytes)
13. Re: [TowerTalk] coax loss (score: 1): Author: Cqtestk4xs@aol.com; Date: Fri, 12 Feb 2010 11:41:03 EST; The difference between 40 db over 9 and 41 dB over 9 or even S8 and S9 is very hard to measure, but it is sure easy to tell the difference between a signal right at the noise floor and one 6 dB above; /archives//html/Towertalk/2010-02/msg00323.html (8,465 bytes)
14. Re: [TowerTalk] Coax loss (score: 1): Author: Mark Spencer <mspencer12345@yahoo.ca>; Date: Mon, 24 Nov 2014 10:46:15 -0800; Yes, I have measured actual coax loss using both dummy loads and antennas at the end of the cables. IIRC in almost all (maybe all ?) cases (baring obvious issues with connectors and adapters) the mea; /archives//html/Towertalk/2014-11/msg00474.html (18,238 bytes)
15. [TowerTalk] Coax Loss (score: 1): Author: Wilson Lamb <infomet@embarqmail.com>; Date: Sat, 28 Nov 2020 12:10:47 -0500 (EST); Can the VNA deal with arbitrary impedance? Your cal standards are 50 Ohms. Isn't the Byrd a 50 Ohm device? I have wondered about that. WL _______________________________________________ _____________; /archives//html/Towertalk/2020-11/msg00254.html (6,504 bytes)

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