Posted by
Cookie on
Mar 09, 2012; 10:24pm
URL: http://elecraft.85.s1.nabble.com/high-power-tuner-tp7314904p7359773.html
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 <
[hidden email]>
To:
[hidden email]
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.htmlSent from the Elecraft mailing list archive at Nabble.com.
______________________________________________________________
Elecraft mailing list
Home:
http://mailman.qth.net/mailman/listinfo/elecraftHelp:
http://mailman.qth.net/mmfaq.htmPost: mailto:
[hidden email]
This list hosted by:
http://www.qsl.netPlease help support this email list:
http://www.qsl.net/donate.html______________________________________________________________
Elecraft mailing list
Home:
http://mailman.qth.net/mailman/listinfo/elecraftHelp:
http://mailman.qth.net/mmfaq.htmPost: mailto:
[hidden email]
This list hosted by:
http://www.qsl.netPlease help support this email list:
http://www.qsl.net/donate.html