I'd recommend trying Dean Straw's (N6BV) excellent Transmission Line for Windows (TLW), packaged with recent editions of the ARRL Antenna book. You can make estimates of component Q and the tool estimates tuner losses for various mismatches for different tuner configurations (L versus Pi versus ...). This is a modeling, not a measurement tool.
Phil, AD5X has included tuner loss information in his recent ATU review articles in QST. Maybe there's something on his site of interest. http://www.ad5x.com See particularly http://www.ad5x.com/images/Presentations/Remote%20Tuners.PDF for a description of his measurement technique for tuner loss measurement. 73 de Dick, K6KR -----Original Message----- From: elecraft-boun...@mailman.qth.net [mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Wes (N7WS) Sent: Tuesday, February 11, 2014 1:54 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] Tuner Loss question Sorry, but the chart is showing mismatch loss. When we use a tuner, we don't suffer mismatch loss; we suffer tuner losses, which despite the claim(s), can be appreciable. N7WS On 2/11/2014 2:36 PM, tom armour wrote: > Why do you need to know the loss of the tuner? Put a power meter after the tuner and see what your rig is putting out. > Is this the type of chart you are looking > for?http://www.packetradio.com/pdfzips/SWRvsPowerNwatts.pdf > It is not really the tuner that is causing the loss. It is more the feed line. > You can test this by using an external tuner and placing a watt meter both in front and behind the tuner and see what kind of loss you are getting. > Yes the tuner will have loss, but relatively negligible. > > 73 - Tom - wa4ta > >> Date: Tue, 11 Feb 2014 11:47:19 -0600 >> From: jvand...@gmail.com >> To: elecraft@mailman.qth.net >> Subject: [Elecraft] Tuner Loss question >> >> I have lots of data in the loss to be expected in Coax or Open wire >> when running at higher SWR into a multiband antenna - however, I do >> NOT have any real world data on the losses to be expected in a tuner >> system at higher SWR. >> >> So: >> >> Are there any numbers available on what additional losses my Elecraft >> K3 (SN 5283) antenna tuner will experience when the SWR is high - say >> about >> 5:1 or higher when feeding a multiband antenna with 50 Ohm coax on 20 >> meters? Should I expect another 3 dB down in signal strength during >> receive - and also Transmit? Or are the losses higher or lower then that? >> Also, are the losses frequency dependent (like on coax) or are they >> the same across the bands. >> >> Thanks for any available data. >> >> Jobst >> AC0LP >> ______________________________________________________________ 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 ______________________________________________________________ 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
