I am a bit late on this one but I have run a 60 foot or so random wire on my
fence in the back yard. I used television antenna wire standoffs to keep the
bare copper from touching the fense and an MLB Balun form Universal. I have
this hooked to an old Drake R8 and for the most part I am happy. It does
sound as though you are overloading your front end. Maybe something to knock
the gain down a bit will help.

Tim


"ASW" wrote in message
gy.com...
Well I have come to the conclusion that the antenna I have made really
does
not improve anything.

An example would me RTE on 6155. With my Scantenna It comes in pretty
clear. I get about +3dB to +5dB.

A little fading, some static cutting in and out.

With my "DIY" antenna about the same as far as dB goes, but much more
fading, and a lot more static in between fades.

Oh well back to the drawing board.

Thanks

Ant.

On a side note, as I tune across the bands, the "Dead Space" that I know
nothing is one (3200). I get about about +8 dB of pure static. As I
scan
through the frequencies up until about 5000 I get a wave pattern of sinal
that peaks every 60+/- herz. Is this the power in my house? How do I get
rid of it?

Thanks Again.



"ASW" wrote in message
gy.com...
Hi, I am going ot setup my own random/longwire.

I have alread about 50 feet of 50 Ohm RG-6 for the lead in.


I have about 50 feet of 2 conductor speaker wire, and about 200 feet of
4
conducter telephone wire.

First am I going to need a 9:1 transformer to make this work? My input
is
supposed to be 50 Ohm.


Is a sloper omni directional? If not which end goes to what area I want
to
listen to?

Thanks!
Ant

ASW wrote:

Well I have come to the conclusion that the antenna I have made really does
not improve anything.

An example would me RTE on 6155. With my Scantenna It comes in pretty
clear. I get about +3dB to +5dB.

A little fading, some static cutting in and out.

With my "DIY" antenna about the same as far as dB goes, but much more
fading, and a lot more static in between fades.

Oh well back to the drawing board.

Thanks

Ant.

On a side note, as I tune across the bands, the "Dead Space" that I know
nothing is one (3200). I get about about +8 dB of pure static. As I scan
through the frequencies up until about 5000 I get a wave pattern of sinal
that peaks every 60+/- herz. Is this the power in my house? How do I get
rid of it?

Thanks Again.


More than likely, what's happening is RFI from lamp dimmers, dirty power supplies in consumer electronics and the like is finding it's way from your house to the antenna on the braid of the coax.

An impedance matching transformer, with it's own ground should help with that.

Lower the noise level, and you'll find more signals.

could some one explain what An impedance matching transformer is and how i
could make one?

thanks
charles foster

"chuck" wrote:

could some one explain what An impedance matching transformer is and how
i
could make one?

A random wire antenna fed at one end will present a high impedance (~2000
ohms). Most coaxial cables have a characteristic impedance of 50 or 75 ohms.
To match the coax to the antenna, a matching transformer is used.

See.
http://www.hard-core-dx.com/nordicdx...eed/index.html


Or do a Google search on: "9:1 balun"

Art Harris N2AH

CF,

I Am Glad You Asked )

B A L U N - R E A D I N G - L I S T - (First Draft):

The BALUN Defined:

"A balun is a device that joins a balanced line (one that has two
conductors, with equal currents in opposite directions, such as a
twisted pair cable) to an unbalanced line (one that has just one
conductor and a ground, such as a coaxial cable). A balun is a type of
transformer: it's used to convert an unbalanced signal to a balanced
one or vice versa. Baluns isolate a transmission line and provide a
balanced output. A typical use for a balun is in a television antenna.
The term is derived by combining balanced and unbalanced."
http://searchnetworking.techtarget.c...342213,00.html

"Baluns and ununs (unbalanced-to-unbalanced transformers) belong to a
class of matching devices known as transmission line transformers.
They transmit the energy from input to output by a transmission line
mode instead of by flux linkages as in the case of conventional
transformers. When properly designed, they can have extremely high
efficiencies and very broad bandwidths. The theory of operation of
these devices rests chiefly on that of chokes and transmission lines.
A balun or unun is simply a choke that isolates the input from the
output (thus only allowing transmission currents to flow) and a
configuration of transmission lines."
http://www.coilws.com/W2FMI.htm

Balun Explained (WTH is a Balun) by G4NSJ
http://www.g4nsj.co.uk/balun.shtml

The Purpose for a Balun by John Doty
"The purpose of a balun is to block common mode waves (current flowing
in the same direction on both conductors of a transmission line) and
pass differential mode waves (current flowing in opposite directions
on the conductors)."
http://www.hard-core-dx.com/nordicdx...ed/balun3.html

Matching Less Important for Reception - by John Doty
http://www.hard-core-dx.com/nordicdx...ed/balun5.html

A Review of the ICE Model 180 Beverage/Longwire Matching Unit
- - - by John Doty
http://www.anarc.org/naswa/badx/ante...ing_xfrmr.html

Low Noise Antenna - by John Doty
http://www.anarc.org/naswa/badx/ante...e_antenna.html

Grounding is Key to Good Reception - by John Doty
http://www.anarc.org/naswa/badx/antennas/grounding.html

Balun Measurements
http://www.radioworks.com/nbalmeas.html

Experiments on Remote Receiving Loops by Lyle Koehler [KØLR]
(Using a Balun with a LW/LF Loop Antenna)
http://members.aol.com/lwcanews/longwave/lf-loops.htm

Fabricating Impedance Transformers for Receiving Antennas
- - - May 2001 by Paul Bryant
http://members.aol.com/DXerCapeCod/z_transformers.pdf

Balun Core and Winding Methods
http://www.catchnet.com.au/~rjandusimports/tut_11b.html

Construction and Use of Broadband Transformers
http://www.oselectronics.com/downloa...ansformers.pdf

Winding Your Own Transformers
http://www2.hard-core-dx.com/nordicd...ansformer.html

TRANSMITTER-RATED TOROIDAL BALUN KITS,
TOROIDS & ENAMELLED WIRE PACKS
http://www.ozgear.com.au/balun/ToroidalBalunKits.htm

Binocular Cores vs Toroidal Cores
http://lists.contesting.com/archives.../msg00001.html

RFI - Ferrites - Baluns - Iron Powder
http://www.sadona.com/news/news5.html

Baluns and Common Mode Noise Isolation
http://www.w8ji.com/common-mode_noise.htm

Doug's Antenna Transformer Page
Antenna Transformer Construction and Testing
http://users.netonecom.net/~swordman/Radio/unun.htm

Transmission Line Transformers "THEORY"
http://www.bytemark.com/products/tlttheory.htm

RF Transformers by Mini-Circuits
http://www.minicircuits.com/appnote/tran14-2.pdf

1:1 Balun
http://www.qsl.net/iz7ath/web/02_bre.../pag09_eng.htm

4:1 TRANSMISSION LINE BALUN
http://www.qsl.net/iz7ath/web/02_bre.../pag10_eng.htm

4:1 balun for 160 to 10 meters
http://www.hard-core-dx.com/nordicdx.../4_1balun.html

Putting a Balun and a Tuner Together - by Kevin Schmidt [W9CF]
http://fermi.la.asu.edu/w9cf/articles/balun/

4:1 QRP Balun by C. C. (Clay) Wynn N4AOX
http://kg8ih.cit.cwru.edu/w8edu/proj...ynn-balun.html

W2FMI Transmission Line Transformers (BalUns & UnUns)
- - - by Jerry Sevick
http://www.coilws.com/W2FMI.htm

Homebrew a 4 To 1 Balun - by Mike Martell [N1HFX]
http://www.rason.org/Projects/balun/balun.htm

Beverage Matching/Tuning/Balun - by Mauno Ritola
http://dallas.hard-core-dx.com/archi.../msg02536.html

The Loaded Dog 1:1 Antenna Balun
http://www.geocities.com/the_loaded_.../project1.html

The BALUN - by Ian C. Purdie [VK2TIP]
http://my.integritynet.com.au/purdic/baluns.htm

The Choke Balun at Electronics Tutorials
http://www.electronics-tutorials.com...hoke-balun.htm

Toridal Balun Winding - by W8JI
http://www.w8ji.com/toroid_balun_winding.htm

Balun and Core Selection - by W8JI
http://www.w8ji.com/core_selection.htm

HOW TO Construct a Guanella Balun - by Ralph Holland [VK1BRH]
(A Cost Effective Current-Mode 1:4 Balun)
http://www.arising.com.au/people/Hol...h/CM4Balun.htm

Impedance Matching Transformer (IMT) - by Paul Ormandy [NZRDXL]
http://radiodx.com/spdxr/Baluns.htm

Baluns, Earth and More… - by Paul Ormandy [NZRDXL]
http://radiodx.com/spdxr/Some_Important_Aerial.html

Impedance Matching Transformers for Receiving Antennas
at Medium and Lower Shortwave Frequencies
June 2003 by Bill Bowers, John Bryant and Nick Hall-Patch [VE7DXR]
http://radiodx.com/spdxr/media/imt_doc1.doc

Magnetic Longwire Balun (MLB) Palomar
http://www.palomar-engineers.com/MLB-1/mlb-1.html

MLB for DX-Antennas - by "VK3KCG" Australia
http://dxantennas.com/wst_page4.php

The Magnetic Longwire Balun (MLB)
= = = A "CON" or Not ?
http://www.hard-core-dx.com/nordicdx...d/magbal1.html

The Complete Answer to your Interference Problem
the "LWC System" for Long Wire Antennas
http://ourworld.compuserve.com/homep...kit/lwcsys.htm

W1CG - Balun Kit
http://www.njqrp.org/balun/


iane ~ RHF
..
..
= = = "chuck"
= = = wrote in message ...
could some one explain what An impedance matching transformer is and how i
could make one?

thanks
charles foster

..

ASW wrote:

I have alread about 50 feet of 50 Ohm RG-6 for the lead in.

RG-6 is 75-ohm cable, but no need to worry.

Art N2AH

Harris wrote:

ASW wrote:

I have alread about 50 feet of 50 Ohm RG-6 for the lead in.

RG-6 is 75-ohm cable, but no need to worry.

Art N2AH

I use R6U coax made for satellite TV systems. I has good shielding and
works well as the lead wire for my low noise inverted-L (Doty-L)
antenna. R6U coax is 75-0hm and the radio (R8B) has a 50-ohm antenna
input but the mismatch hardly matters for shortwave receiving.


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