NS,

FEEDLINES:

A Coax Cable is an Unbalanced Line (Single Wire and Ground Shield).

Balanced Lines are like Ladder Line and TV type Twin Lead (Dual Wires).

ANTENNAS:

Balance 'type' Antennas: Dipoles, Loops, Rhombic, Inverted "V", etc.

Unbalanced 'type' Antennas: Long Wire, Zep, Random Wire, Inverted "L",
Sloper, etc.

MATCHING TRANSFORMERS / BALUNS / MLBs:
* Balun Reading List ( Long )
http://groups.yahoo.com/group/Shortw...na/message/337

A Matching Transformer can be used to 'connect' an Antenna Element
to a Feed Line.

A "Balun" is specific type of 'matching transformer' that is used
to 'connect' a Balanced Antenna to an Unbalanced Feed-Line.

Another specific type of 'matching transformer' that is used
to 'connect' an Unbalanced Antenna to an Unbalanced Feed-Line
is called a "Magnetic Long Wire Balun" (MLB). The MLB is often
used with the common Random Wire Antennas and Coax Cable
Feed-Lines used by most Shortwave Listeners (SWLs).
* Magnetic Longwire Balun (MLB) - Build Your Own "DIY"
http://groups.yahoo.com/group/Shortw...na/message/177
http://groups.yahoo.com/group/Shortw...na/message/466
http://groups.yahoo.com/group/Shortw...na/message/467


READ these three Links 'presented' by John Doty:
[ Hosted by The Association of North American Radio Clubs "ANARC".]

* Longwire Impedance Matching. {Check-Out the Graphs}
http://www.anarc.org/naswa/badx/ante..._longwire.html
Actually, a fixed Matching Transformer can dramatically reduce the
wild swings in Antenna Efficiency that a Coax Fed Wire Antenna
exhibits.

* Grounding is the KEY to Good Reception
http://www.anarc.org/naswa/badx/antennas/grounding.html

* Low Noise Antenna Connection
http://www.anarc.org/naswa/badx/ante...e_antenna.html


iane ~ RHF
..
Some Say: On A Clear Day You Can See Forever.
http://groups.yahoo.com/group/SWL-AM...na/message/502
I BELIEVE: On A Clear Night...
You Can Hear Forever and Beyond, The Beyond !
..
..
= = = "Nicolae Santean" wrote in message
= = = ...
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I have a rookie question related to baluns.

In what sense is said that

a coax. cable is an unbalance line
an antenna is a balanced system
a twin cable is a balanced line ?

Of course a second question would be how does the balun interface a balanced
and an unbalanced system?

Cordially,

Nic.
http://www.csd.uwo.ca/~nic

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