I wonder how those that claim a certain efficiency for a MFJ-998 or any other antenna matching device are measuring the output power. No watt meter that I know including the famous and antique Bird can measure power with any degree of accuracy unless the load is very near the nominal value (usually 50 ohms). If you need a tuner, your antenna does not meet this criteria so, what are you using to form your opinion? I suppose that you could compare two tuners for a relative efficiency by using the same transmitter and antenna and a field strength meter. Of course, if you are running near the rated power, you can watch for smoke and get a one time opinion that the device was not efficient enough to survive. Willis 'Cookie' Cooke K5EWJ & Trustee N5BPS, USS Cavalla, USS Stewart
________________________________ From: W5RDW <rwhitete...@verizon.net> To: elecraft@mailman.qth.net Sent: Friday, March 9, 2012 4:10 PM Subject: Re: [Elecraft] high-power tuner Never had any reason to wonder if my MFJ-998 has more than normal loss. It hasn't let any smoke out of the cabinet yet! I use to run a Drake L-7 thru it, but now use the KPA500 all the time and have retired the Drake. > /Most of the MFJ tuners tend to rank pretty low in that respect./ Dave, I'd be interested in reading about the info you have on the MFJ tuner loss. ----- Roger W5RDW -- View this message in context: http://elecraft.365791.n2.nabble.com/high-power-tuner-tp7314904p7359740.html Sent from the Elecraft mailing list archive at Nabble.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 ______________________________________________________________ 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
