Without seeing the entire diagram, SWR is not a consistent value throughout the feedline. We actually proved this a one of my classes back in college. I can't remember how many jumper cables I made to up to this test at 100Mhz. All different wavelengths and random lengths as well.
Let me borrow something Cecil KG7BK said in a previous forum a long time ago. *The SWR changes every inch up and down the transmission line because everyinch has a finite loss and because the SWR is never exactly 1/1 at theload. _For practical purposes_ if the transmission line is matchedto the load the SWR is close enough to 1/1. If the transmission line is not matched to the load, the SWR decreases in the direction toward the generator because of losses. Removing an inch of transmission linechanges the SWR... inserting an SWR meter changes the SWR... hopefullyby a neglible amount.* *SWR's of 1/1, infinite and zero impedences, exactly 50 ohm antennas andtransmission lines are human concepts that do not exist in reality.Sometimes they are good approximations to reality and sometimes they arenot.* Mike va3mw On Wed, Sep 14, 2016 at 3:55 PM, Barthold Lichtenbelt via Elecraft < elecraft@mailman.qth.net> wrote: > > The KAT500 Utility will show the "bypass VSWR", which is the SWR observed > by the ATU when it is in Bypass. > > As will the SWR meter on the KPA500, right? > > Barthold > > -----Original Message----- > From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Dick > Dievendorff > Sent: Wednesday, September 14, 2016 1:24 PM > To: 'Joe K2UF'; elecraft@mailman.qth.net > Subject: Re: [Elecraft] SWR question > > If your TX sensor is in line after the KAT500, you might be observing the > SWR of the antenna side of the ATU. The KPA500 and KAT500 LEDs show the SWR > at the transmitter side of the ATU, rather than the antenna side. > > The KAT500 Utility will show the "bypass VSWR", which is the SWR observed > by > the ATU when it is in Bypass. > > 73 de Dick, K6KR > > > > -----Original Message----- > From: Elecraft [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Joe > K2UF > Sent: Wednesday, September 14, 2016 11:49 > To: elecraft@mailman.qth.net > Subject: [Elecraft] SWR question > > Using my K3/KPA500/KAT500/P3+SVGA with the TX sensor in line. > > On the KPA500 the SWR reads 1.3 with one or two SWR led's lit also one > or > two led's lit on the KAT500 but the SWR display on the P3 shows about 6. > > Any ideas why this is happening? > > Joe K2UF > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message > delivered to d...@elecraft.com > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message > delivered to bartho...@yahoo.com > > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to va...@portcredit.net > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
