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Re: high-power tuner

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
--
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