air core baluns

A Hairpin match for 5 el. Tonna - How to improve the gain of your 5 element Tonna yagi for 50 MHz by roughly 3 db! by PA2HJS

Baluns on Log Perodic Antennas - Some antenna manufacturers place baluns at the incorrect location in LPDA arrays. If we consider what the balun does we can see how the mistake occurs.

Building baluns  ^pop - How to easily home-brew baluns even in strange formats 1/1 - 2/1 - 4/1 - 6/1 - 9/1 - 12/1 et 16/1 for bands from 1.8 to 30 (50) MHz in french

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

The Radio Guy - Antique Radio Repairs Restorations Sales

Renovated radios - Antique Radios for Sale, Old Radios Repaired, Reproduction Parts and CD's

Rick's Antique Radios - Restoration And Repair Service Since 1972

AIRWAVES:Wayne's Vintage Radio's - Old radios collection, vintage radios, sale trade and wanted

Transoceanic resource library - Transoceanic radios, zenith radios, service data, pictures schematics, manuals and owners data.

The old radio fixer-upper guy - This site is dedicated to the repair, restoration, preservation and sale of old collectable radios, both bakelite and wood.

The Speaker Shop Antique Speaker Repair - Specializing in vintage and antique speaker repair,recone and restoration.

RadioActivity: Radio Repair - Radioactivity. radio repair, services, and warranty on 1920's - 1960 radios. New and used tubes.

Antique automobile schematics - Antique automobile radio repair and schematics

Illinois QSO Party - The Radio Amateur Megacycle Society

Oklahoma QSO Party - Sponsored by the Oklahoma DX Association

IOTA Bearing & Distance list for your QTH - A list of all IOTA reference numbers and IOTA groups for the Islands On The Air award, personalised to your own QTH

RippleTech Electronics - Wide bandwidth Trapped Verticals and rotary dipoles, baluns, 40m/80m wire dipoles and accessories from Australia.

Low Power Radio and Broadcast Company - Manufacturers of high performance low power am transmitter products: sstran amt3000, bc-100, and the mw-250. for home and professional use.

Alpha Amplifier Upgrades - Alpha 77D,DX,SX, Alpha 76, Alpha 78 and 374 repair service and upgrade kits

WA8SAJ Drake repair service - Drake Radio Repairs by Jeff WA8SAJ

WA4GEG Repair Service - HamRadioBug.com the new home for Electronic Equipment Service. Yaesu high-end series SSB/CW transceiver repair

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.

Burghardt Amateur Center - Yaesu Kenwood Alinco AEA Icom Geochron Phillystran dealer. Offer used products, custom products external relay box, antenna input protector and repair service

HeliCoil - Inductance calculation for single layer, air-wounded coils and helixes up to about 800 MHz. Inductance calculations accuracy is around 1%. Also, coils with maximum Q for given inductance, resonant RF chokes, PI and T resistive attenuators calculations are provided. Skin effects, radiation losses and other minor side effects are not accounted in maksimum Q factor coils calculations. Program assumes using copper (Cu) enameled or silver (Ag) plated wire. Program is writen bilingual in English and Serbian by YU1AW

Using ferrite for interference suppression - Excellent guide to using ferrite cores for interference suppression. Understanding and Solving RF Interference and Noise Problems by Jim Brown K9YC Audio Systems Group, Inc. PDF File