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1. [TenTec] SWR VS Power Loss (score: 1): Author: Jim WA9YSD <wa9ysd@yahoo.com>; Date: Fri, 4 Jul 2008 04:31:58 -0700 (PDT); Found this nice table. Thought I would pass it along. http://www.firestik.com/Tech_Docs/SWRLOSS.htm Keep The Faith, Jim K9TF/WA9YSD _______________________________________________ TenTec mailing list; /archives//html/TenTec/2008-07/msg00053.html (6,660 bytes)
2. Re: [TenTec] SWR VS Power Loss (score: 1): Author: Steve Hunt <steve@karinya.net>; Date: Fri, 04 Jul 2008 13:25:58 +0100; Jim, That table could be very misleading without a lot more info. For example, is it showing the total loss, or the "excess SWR loss"? What type of cable is it for? And what length? At what frequency; /archives//html/TenTec/2008-07/msg00054.html (7,621 bytes)
3. Re: [TenTec] SWR VS Power Loss (score: 1): Author: "Duane Calvin" <ac5aa1@gmail.com>; Date: Fri, 4 Jul 2008 10:22:37 -0500; Most non-TT radios will crowbar the output finals well before 10:1 SWR is reached. I'm not sure what this chart is supposed to be addressing because there are so many variables which will affect the; /archives//html/TenTec/2008-07/msg00055.html (7,767 bytes)
4. Re: [TenTec] SWR VS Power Loss (score: 1): Author: Patrick Signs <psn7ic@hotmail.com>; Date: Fri, 4 Jul 2008 16:10:56 +0000; Hmm, doesnt appear to show the losses you would get in your feedline. 73 Pat _________________________________________________________________ Need to know now? Get instant answers with Windows Live; /archives//html/TenTec/2008-07/msg00056.html (9,085 bytes)
5. Re: [TenTec] SWR VS Power Loss (score: 1): Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>; Date: Fri, 04 Jul 2008 10:07:41 -0700; The definitive graphs are in the ARRL Handbook and ARRL Antenna Book. The ARRL Antenna Book comes with an excellent program that computes SWR for any load, then computes loss for that degree of misma; /archives//html/TenTec/2008-07/msg00057.html (7,890 bytes)
6. Re: [TenTec] SWR VS Power Loss (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Fri, 04 Jul 2008 11:38:56 -0600; Last month I bought a copy of the 2006 ARRL Handbook through Abe Books for $8.32 before an Abe Books coupon. It included the software. They don't become instantly obsolete when the next edition comes; /archives//html/TenTec/2008-07/msg00058.html (9,440 bytes)
7. Re: [TenTec] SWR VS Power Loss (score: 1): Author: Michael Tope <W4EF@dellroy.com>; Date: Fri, 04 Jul 2008 11:01:34 -0700; Steve, This table just shows the percentage of incident power reflected and transmitted at a mis-matched RF transmission interface. You'll notice that the "% of Loss" versus transmitted power (what t; /archives//html/TenTec/2008-07/msg00060.html (10,149 bytes)
8. Re: [TenTec] SWR VS Power Loss (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Fri, 04 Jul 2008 12:25:31 -0600; Does not compute! 1 KW forward and 1/2 KW reflected says 1.5/.5 = 3:1 SWR, not 6:1. E.G. SWR = (forward + reflected) / (forward - reflected). 6:1 SWR is 71.45% reflected, 1.7145/0.2855.. What that ta; /archives//html/TenTec/2008-07/msg00062.html (11,066 bytes)
9. Re: [TenTec] SWR VS Power Loss (score: 1): Author: Ken Brown <ken.d.brown@hawaiiantel.net>; Date: Fri, 04 Jul 2008 08:24:39 -1000; "SWR (Standing Wave Ratio) affects the power output of your radio. The following table shows the effect of SWR for a transmitter with 4 watts of transmitted power." Using a standard power level of 4; /archives//html/TenTec/2008-07/msg00063.html (9,284 bytes)
10. Re: [TenTec] SWR VS Power Loss (score: 1): Author: "Dr. Gerald N. Johnson" <geraldj@storm.weather.net>; Date: Fri, 04 Jul 2008 12:56:28 -0600; But the data presented is just plain wrong except for the 1:1 case. All the rest is trash. Its the same quality data as CB antenna gain claims. 73, Jerry, K0CQ _______________________________________; /archives//html/TenTec/2008-07/msg00065.html (9,780 bytes)
11. Re: [TenTec] SWR VS Power Loss (score: 1): Author: Michael Tope <W4EF@dellroy.com>; Date: Fri, 04 Jul 2008 15:37:31 -0700; Hey Jerry, VSWR = (1 + |RHOv|)/(1-|RHOv|) For VSWR = 6:1, |RHOv| = 0.71 (i.e. 1.71:/0.29) Return Loss = 20*log(|RHOv|) = 20*log(0.71) = -3dB I think you forgot to square the voltage reflection coeffi; /archives//html/TenTec/2008-07/msg00067.html (9,612 bytes)
12. Re: [TenTec] SWR VS Power Loss (score: 1): Author: "DAVID HELLER" <dtx@verizon.net>; Date: Sat, 05 Jul 2008 17:04:46 -0400; Jim, your statement is incomplete. Should read, "..any EE who lacks a copy of the ARRL hand book ...." How many hams realize that the Handbook ranks very near the top of the list of all-time best sel; /archives//html/TenTec/2008-07/msg00077.html (10,085 bytes)
13. Re: [TenTec] SWR VS Power Loss (score: 1): Author: "Jim Brown K9YC" <k9yc@audiosystemsgroup.com>; Date: Sat, 05 Jul 2008 14:50:08 -0700; I agree. I've recommended it to many colleagues working on the technical side of pro audio, and to many who want to get started in any kind of radio or electronics. I've often said that I thought mor; /archives//html/TenTec/2008-07/msg00078.html (8,964 bytes)

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