In article ,
David wrote:

Telamon wrote:
In article
,
Telamon wrote:

In article ,
David wrote:

RHF wrote:
The Verdict {One Man's Opinion} : Magnetic Longwire Balun Is Too
Expensive

http://www.hard-core-dx.com/nordicdx.../magbalun.html

-by- Alan Johnson

-source- Hard-Cord-DX website : http://www.hard-core-dx.com/
The Most Common Antenna Type
Randon Wire Antenna Problems
Enter the Balun
The Magnetic Longwire Balun (MLB)
In the Laboratory
After Four Rainy WeekEnds
I also did A-B Comparisons
* The Results
The "Resistance" Curve for the MLB
The N8KDV Transformer
A-B Testing was very Revealing.
* Recommenation
How Essential is a Perfect Match?
Based on Price and Performance
The MLB Definitely Wins

Originally Published in the NASWA Journal - July 1992
-by- Alan Johnson [N4LUS]

Magnetic Longwire Balun (MLB)
http://www.universal-radio.com/catalog/sw_ant/1484.html
http://www.dolstra.nl/Z&L-amateur/AN...tems/MLB_1.JPG
http://www.remeeus.eu/english/hamradio/mlb.htm
http://ham.srsab.se/graphics/antennas/mlbII.jpg
-by- RF Systems - MSRP Price ~ $60

Alternative "MLB" - MLB-1 Magnetic Longwire Balun
http://www.palomar-engineers.com/MLB-1/mlb-1.html
-by- Palomar Engineers - MSRP Price ~ $50

NOTE - While the 'N8KDV Transformer' is presently Not Available.
WinRadio does offer the LWA-0130 Long Wire Antenna Adapter
http://www.grove-ent.com/WR0130.html
http://www.winradio.com/home/lwa.htm
http://www.winradio.com/home/ax05e.htm
-by- WiNRADiO - - MSRP Price ~ $40
READ - Good Deal on 9:1 Matching Transformer
http://groups.google.com/group/rec.r...e40978fdc32ac0
-by- William Fieldstone
More WinRadio LWA-0130 Long Wire Antenna Adapter Postings
http://groups.google.com/group/rec.r...7d380609eec592
http://groups.yahoo.com/group/Shortw...na/message/230


iane ~ RHF
.

[D]iane,

The point is to keep the feedpoint Z below the transmission line Z.

What's the advantage of the feed-point Z being below the transmission
line Z?

OK I'll answer it. None.


Less pinching in the midriff...

There's a rule.

OK here is the rule, when you have an impedance mismatch by some ratio
it does not matter which system element is higher or lower so for
example if the coax transmission line is 50 ohms and the antenna
impedance is 25 or 75 ohms the result is the same amount of reflected
power. 25 ohms and 75 ohms are equivalent in this regard. One is not a
better situation than the other.

Take an extreme case of this where you have either a short or the coax
is open with nothing connected on that end. In either case if you were
to send RF power to the open or short end of the cable you would have
100% reflected power. The returned phase of the that power would be 90
degrees different though.

This is different situation then DC current where the open and short
would have very different consequences.

--
Telamon
Ventura, California