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Total 8 documents matching your query.

1. [Amps] Trimming the transmission line (score: 1): Author: "Barry Kirkwood" <barry.kirkwood@gmail.com>; Date: Thu, 11 Oct 2007 23:30:38 +0000; Have I got it wrong? As I see it: True: Changing the length of a transmission line will not change the SWR. True: It the SWR is other than !:1, trimming the line may bring one to a point where there; /archives//html/Amps/2007-10/msg00143.html (6,715 bytes)
2. Re: [Amps] Trimming the transmission line (score: 1): Author: "Gary Smith" <wa6fgi@sbcglobal.net>; Date: Thu, 11 Oct 2007 18:12:33 -0700; Is this the (possible) reason that Collins radio stated when using the 30-s-one to use exactly twenty feet of coax between the xcvr/xmtr and the linear? This info is one of the first cautions stated; /archives//html/Amps/2007-10/msg00146.html (8,191 bytes)
3. Re: [Amps] Trimming the transmission line (score: 1): Author: rgroh@swbell.net; Date: Thu, 11 Oct 2007 19:19:59 -0700 (PDT); Yes. Although to generalize Barry's statements a bit, restricting the feedline to a certain length 'moves' the antenna impedance to a different impedance which is easier for the transmitter to handle; /archives//html/Amps/2007-10/msg00148.html (9,312 bytes)
4. Re: [Amps] Trimming the transmission line (score: 1): Author: "jeryb77" <jeryb77@hotmail.com>; Date: Thu, 11 Oct 2007 22:38:51 -0400; INPUT CIRCUITS Pi-network broad-tuned circuits and the interconnecting r-f feed line match the 50-ohm input impedance to the cathode impedance, which is approximately 100 ohms. The 20.5-foot length; /archives//html/Amps/2007-10/msg00149.html (8,041 bytes)
5. Re: [Amps] Trimming the transmission line (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 12 Oct 2007 06:05:45 +0200 (CEST); The 30S1 is a bit of a special case, since it relies on the length of line because of phase changes. Because there's a change in input impedance with power level, if the length of line isn't an exact; /archives//html/Amps/2007-10/msg00151.html (8,220 bytes)
6. Re: [Amps] Trimming the transmission line (score: 1): Author: "Gary Smith" <wa6fgi@sbcglobal.net>; Date: Fri, 12 Oct 2007 08:21:32 -0700; Thanks for the VERY good explanation on this issue. 73's, Gary...wa6fgi _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listi; /archives//html/Amps/2007-10/msg00157.html (9,022 bytes)
7. [Amps] Trimming the transmission line (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Fri, 12 Oct 2007 18:34:50 +0200 (CEST); It did strike me that there is a case where trimming the length of feeder affects the SWR. Let's assume that I happen to have an antenna with a feed point impedance of 100 + j0. I have an electrical; /archives//html/Amps/2007-10/msg00158.html (8,083 bytes)
8. Re: [Amps] Trimming the transmission line (score: 1): Author: "Saandy Eban" <alexeban@gmail.com>; Date: Fri, 12 Oct 2007 18:29:11 +0200; 1) true 2) WHAT THE REACTIVE COMPONENT OF THE LOAD DOES IS CREATE A PHASE SHIFT BETWEEN CURRENT AND VOLTAGE ON THE LINE. AS SUCH, IF THE SWR IS DIFFERENT FROM 1:1 THE RAEACTIVE CONPONENT WILL BE ALWA; /archives//html/Amps/2007-10/msg00160.html (9,051 bytes)

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