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## Re: [TowerTalk] PL259 Insertion Loss?

 To: towertalk@contesting.com Re: [TowerTalk] PL259 Insertion Loss? Steve Hunt Sun, 15 Jan 2012 16:26:24 +0000 mailto:towertalk@contesting.com>
 Just to illustrate that last point: Consider a perfect 50 Ohm load connected to a source through three 6ft lengths of 50 Ohm lossless coax with Vf=0.66. The three lengths of coax are joined with two connectors. Assume the connectors introduce an impedance discontinuity equivalent to a 1.2" (0.1ft) section of lossless 100 Ohm line with Vf=1. We find that the connector nearest to the load introduces a discontinuity which causes the VSWR on the middle 6ft of coax to rise from 1:1 to 1.03:1. However, the discontinuity introduced by the connector nearest the source, acting on the transformed line impedance seen at that point, tends to lower the VSWR again; the VSWR seen by the source improves from 1.03:1 to 1.004:1. So, in that example, from an impedance discontinuity perspective two connectors are better than one! Only if the line section between the two connectors was an exact electrical half-wavelength (or multiple) would the connector perturbations be fully cumulative. As I said, you can't simply sum mismatch losses for each connector like you can resistive losses. 73, Steve G3TXQ On 15/01/2012 14:57, Steve Hunt wrote: > > By the way, you can't simply sum mismatch losses for each connector like > you can resistive losses - the interactions are much too complex for that. > _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk
 Current Thread Re: [TowerTalk] PL259 Insertion Loss?, (continued) Re: [TowerTalk] PL259 Insertion Loss?, K8RI Re: [TowerTalk] PL259 Insertion Loss?, Roger (K8RI) Re: [TowerTalk] PL259 Insertion Loss?, Cqtestk4xs Re: [TowerTalk] PL259 Insertion Loss?, Cqtestk4xs Re: [TowerTalk] PL259 Insertion Loss?, Steve W3AHL Re: [TowerTalk] PL259 Insertion Loss?, Paul Christensen Re: [TowerTalk] PL259 Insertion Loss?, Jim Brown [TowerTalk] PL259 Insertion Loss?, don daso Re: [TowerTalk] PL259 Insertion Loss?, Mike Ryan Re: [TowerTalk] PL259 Insertion Loss?, Steve Hunt Re: [TowerTalk] PL259 Insertion Loss?, Steve Hunt <= Re: [TowerTalk] PL259 Insertion Loss?, Steve Hunt Re: [TowerTalk] PL259 Insertion Loss?, Jim Brown Re: [TowerTalk] PL259 Insertion Loss?, Peter Voelpel Re: [TowerTalk] PL259 Insertion Loss?, Jim Brown Re: [TowerTalk] PL259 Insertion Loss?, Peter Voelpel [TowerTalk] PL259 Insertion Loss?, Jim Thomson [TowerTalk] PL259 Insertion Loss?, Jim Thomson [TowerTalk] Sealing coax connectors, Bob K6UJ Message not availableRe: [TowerTalk] Sealing coax connectors, Bob K6UJ Re: [TowerTalk] Sealing coax connectors, Marlon K. Schafer \(509-982-2181\)