BT,

The Shortwave (SW) Antenna used determines the type
of Matching Transformer you will want to use with it.
http://groups.yahoo.com/group/Shortw...a/message/9436

The type of Shortwave Listening (SWL) Antenna that
you are using will help in determining the type of
Matching Transformer that you would wish to use :
Plus the Range of Frequencies that you wish to cover
with the SWL Antenna and Matching Transformer.

SINGLE (1) WIRE ANTENNAS :
For many forms of Longwire {Random Wire} Antennas
Horizontal, Inverted "L" or Sloper used for 500
kHz to 30 MHz a 9:1 Matching Transformer is often
recommended. These are single (1) Wire Antennas
that Require a Ground to complete the other half
of the Antenna-to-Ground System.

TWO (21) WIRE ANTENNAS :
For many forms of Dipole {type} Antennas : Dipole
Windom, Inverted "V" and other "Balanced" Antennas
being used for 500 kHz to 30 MHz a 4:1 Matching
Transformer is often recommended. These are Two (2)
Wire Antennas that do not require a Ground to complete
the other half of the Antenna-to-Ground System.


A SOURCE FOR THE "RIGHT" MATCHING TRANSFORMER :
QRP BALUNS = http://www.geocities.com/qrp_baluns/
The eBay Seller "RF Junkie" offers a variety of
Matching Transformers that are specifically designed
for a large number of different types of Antennas.
His Matching Transformers for the most part designed
for "QRP" [Low Power] Transmitting so they are built
more than 'good enough' for a "Receive Only" Shortwave
Antenna application.
http://www.geocities.com/qrp_baluns/product.html

RF Junkie
http://search.ebay.com/_W0QQsassZrfjunkieQQhtZ-1

Erickson Engineering {RF Junkie} eBay Store
http://stores.ebay.com/ERICKSON-ENGINEERING

Here are a few Shortwave Listener (SWL) type Matching
Transformers that can be used with Random Wire type
Antennas [Single Wire with a Ground] a Coax Cable
feed-in-line and most Shortwave Radios and Receivers
that have an SO-239 Jack or a 1/8" Mono-Jack as their
External Antenna Input :

* Shortwave Antenna Longwire Transformer Balun
LMZ-50 = http://cgi.ebay.com/_W0QQitemZ9724368153
For RG8/RG58 50 Ohm Coax Cable with PL-259 Plug

* Shortwave Longwire Antenna Matcher
LMZ-75 = http://cgi.ebay.com/_W0QQitemZ9721309599
For RG6 75 Ohm Ohm Coax Cable with "F" Connectors

* Shortwave Longwire Antenna Transformer 9:1
SWLZ = http://cgi.ebay.com/_W0QQitemZ9724601737
For RG6 75 Ohm Ohm Coax Cable with "F" Connectors

"QB-Series" Antenna Baluns
http://www.geocities.com/qrp_baluns/QB-baluns.html

Matching Transformer (Balun / UnUn) Application Notes
http://www.geocities.com/qrp_baluns/app-notes.html
* How to connect wires to "QB Series" Baluns and Ununs?
* Weather-Proofing "QB Series" Baluns and Ununs
* SWLZ Application Setup for the Shortwave Listener (SWL)
* QB-9E/QB10E Application Setup for Longwire (SWL and QRP)
* QB-10I Application Setup for the Shortwave Listener (SWL)
* LMZ-75 Application Setup for Longwire (SWL)
* LMZ-50 Application Setup for Longwire (SWL and QRP)
* * Do you have RX Noise Problems?
[ See possible Sources here ]

RF Junkie Answers The Age Old Question :
"Which Balun do I need for my Antenna ?"
http://www.geocities.com/qrp_baluns/balun-choice.html
- - - Which Matching Transformer Do I Need ?

Frequently Asked Questions -About- Baluns / UnUns
http://www.geocities.com/qrp_baluns/faq.html
RF Junkie's Matching Transformer FAQs WebPage

ABOUT - RF Junkie {Erickson Engineering}
http://www.geocities.com/qrp_baluns/about.html
-aka- Jason Erickson [KG7RO]

Contact Information for Erickson Engineering
and RF Junkie's "QRP" Matching Transformers
http://www.geocities.com/qrp_baluns/contact.html

Antenna Information Links -by- RF Junkie
http://www.geocities.com/qrp_baluns/antennas.html
Links to Info about : Antenna Basics -
- The Dipole Antenna - Dipole Calculator
- Wire Antennas - Hard Core DX
- Rhombic Antenna - G5RV Antenna
- Flag / Pennant Antenna Info - K9AY Loop Antenna
- Wire Loop Antenna - Windom Antenna
- Beverage Antenna - Bandplans - QRP Links
- Shortwave Frequencies - Amateur HF Frequencies

MY OPINION : He may call Himself "RF Junkie" but his
QRP Baluns are No Junk - This is Good Stuff Maynard !


transforming useful information into practical knowledge - iane ~ RHF
..
Shortwave Listener Antennas = http://tinyurl.com/ogvcf
http://groups.yahoo.com/group/Shortwave-SWL-Antenna/
SWL Antenna Group = http://tinyurl.com/ogvcf