Hi Guys, if there are several who want to measure the two MFJ balum
tuners loss on several bands, I can do it and will be glad to do it and
report back. I will do it just like I did it when I measured MFJ tuner
loss. You can see what I do by clicking on MFJ on my web page at:
http://www.zianet.com/k5di/
73 Karl
[EMAIL PROTECTED] wrote:
Great Idea - thanks for pointing me to the obvious <GR>.
Just as I was contriving a highly complex solution to a non existent problem!!
Besides, one could always use another balun.
73s
Pete
From: Karl Larsen <[EMAIL PROTECTED]>
Date: 2006/10/07 Sat AM 07:07:13 CDT
To: Dave G4AON <[EMAIL PROTECTED]>
CC: [email protected]
Subject: Re: [Elecraft] Baluns & wires & feeders (oh, my!)
Dave G4AON wrote:
There is a simple way to measure the efficiency of a balun, make two of
them and connect them "back to back". Measure the power fed to them and
the corresponding output power. Obviously this doesn't take a mismatched
antenna into account.
I did just that about this 5 years ago. I used two MFJ tuners
connected by the 4:1 baluns in each. I fed one from my MFJ Antenna
Analyser and hooked a 50 ohm resister to the other tuner. I measured the
voltage across the resistor with a RF probe.
Alas I can't locate the paper where I wrote down the results. Over
the bands the loss was around 10-15% I recall and I thought that was
about what I expected.
73 Karl K5DI
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Pete Axson
WD4LST
17901 NE 18th Ave
Citra, FL 32113
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