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A model of a practical Ruthroff 1:4 balun - The 1:4 balun is of particular interest because it underlies many other configurations, and understanding it helps towards understanding the other Ruthroff balun configurations.

F6EZX Deltaloop - F6ezx homebrewing a deltaloop antenna in French

Transmission Lines - About feed lines, parallel lines and coaxial lines, notes on impedance, SWR, Baluns, velocity factor and more by NZART

G5RV antenna - Review by G3TXQ and comparison to its modificated versions. SWR Measurements on inverted V setup and comparison from EZNEC model and a real one.

900 MHz antenna - VE3CVG's 900 MHz 7 Element Plumber’s Delight Yagi Antenna

The FD4 (FD3) Windom Antenna  ^pop - The 4-band Fritzel model FD4 is a special version of a Windom antenna. It is a half-wave long on the lowest frequency, and is fed from a coax cable through a transformer inserted in the wire at one-third from one end

Australian Vintage Radio - How old is my valve Radio? this website host a reference of model numbers and year of manufacture for many antique radios

K8GP Delmarva VHF and Microwave Society - K8GP web site, home of the Grid Pirates Contest Group.

The Potomac Valley Radio Club - A world-class amateur radio contesting club, is represented by two chapters in North Carolina and extends as far north as Pennsylvania and Delaware.

Frankford Radio Club - The Frankford Radio Club originated in the Frankford High School, in Philadelphia, around 1927.

SM Swedish Hams Call Sign Lookup - Search Swedish amateur radio operators by call-sign name, family name or city, service offered by SSA

OPERATION Team - Emergency Communications, SKYWARN, Foxhunts, Education and Public Service

South Coast Amateur Radio Club Inc. - South Coast Amateur Radio Club, south of Adelaide. Contests, Field Day, License Courses, Repeaters, BBS & Clubrooms.

KTK Belgium - KTK, de Kortrijkse afdeling van UBA Koninklijke Unie van Belgium Amateurs

Delaware QSO Party - First state amateur radio club

Delaware State Police 911 Scanner  ^updated - Listen to New Castle, Kent or Sussex live police radio scanner

Bucks & Montgomery Live police scanner - Live Police/fire/ems scanner link for Southeastern PA area including Bucks, Montgomery Counties and Philadelphia plus South Jersey area

ICOMM Tele Limited - Largest Capacity of 200,000 MT for Towers & market leader in India with backward integrated rolling & manufacturers of Shelters, V/UHF, Patch Panel Antennas, DIAS & DWDM Equipment

DX-Stations Guide to RTTY Operations - This guideline should help you in preparing your dxpedition and make the most out of RTTY.

All Parts Inc. - Obsolete Electronic Parts & Hard to Find Electronic Parts

QSL Card Albums and Organizers - Cheap qsl card holders, albums and organizers. Fast delivery also has a number of other archival safe products through archivesafe.com and qsl card paper for printing your own qsl cards.

Ham Repair - Ham Radio repair of all major brands and models, located in Carrollton, Texas, which is just north of Dallas, and have been serving the Amateur Radio community for over 20 years.

ASCII to ADIFF - This program will convert comma delimited ASCII files to ADIF format for import into a logging program that supports ADIF import. The program is intended to be used with comma separated text files produced with other logging programs or with spread sheet programs, such as Excel.

Worldwide City Information Reference eBook - Phone prefix, time zone, latitude and longitude for major cities all over the world

QSL Card Imaging - A database which allows the user to store and catalog QSL cards