tube design

Helical Antenna Calculator - This is my simple implementation of the ARRL Antenna Book design equations for the axial-mode helical antenna.

Helix Calc  ^updated - Helix antenna calculator, to design and make helix antenna plans

N3KNZ Loop designs - Inspired by his first magnetic loop featured on this site, John takes loop building by the horns, and comes up with some excellent designs

Build your first dipole - The dipole antenna is an easily designed and made antenna usually used on HF, although can be (and sometimes is) made for VHF and UHF antennas, and in varying forms is also used as part of different designs of antennas – i.e. as the driven element for directional antennas.

Quarter Wave with radials - VHF quarter wave antenna mainly for scanner usage, The quarter wave antenna is an easily designed and constructed antenna for whatever frequency you want, although with the following design, you may to limit it to the VHF and UHF bands due to the physical size.

Multi-Elmac - THE MULTI-ELMAC AF-67 Trans-Citer is a ten-tube variable frequency or crystal controlled seven band transmitter.

RX3ANF Russian boatanchors - Boatanchors in Russia. Old tube radiosets.

Rec.radio.amateur.boatanchors FAQ - Frequently Asked Questions - about vintage tube-type ham radio and communications equipment

Vintage Radios  ^updated - Purveyor and Collector of Antique/Vintage Radios, Valves (Tubes) and Service Data for many radios. Alba Bush Champion Cossor Dansette Decca Defiant Eddystone Ekco Emerson Etronic Eveready Ferguson Ferranti GEC Grundig HMV Invicta Kolster-Brandes Lissen Marconi Masteradio McMichael Mullard Murphy Pam Perdio Philco Philips Pilot Pye Regentone RGD Roberts Sobell Sony Stella Strad Ultra Vidor

The Old Tube Radio Network - The Old Tube Radio Network is dedicated to those real, American-Made, Old Tube CB Radios

Antique Vacuum Tubes - Electron Tubes - Dealer Priority listing - Antique Vacuum Tubes, Buy, Sell, here you can shop for tubes.

Freeland - Vacuum tubes, power grid tubes, rebuilt vacuum tubes, rebuilt transmitter tubes, rebuilt uhf klystrons, rebuilt cermolox types, rebuilt eimac types, rebuilt thomson types

SSA - Non-Directional Beacon - Airport Locator Beacon, The NDB-SS05 is a complete Dual Non-Directional Navigational Beacon system built to ICAO Annex 10 requirements. It is designed for continuous duty, outdoors operation, easy maintenance and is supported by a full complement of accessories and spare parts.

Tri-County Amateur Radio Club VA3TRI - Website for radio Amateurs in the Hastings, Peterborough, and Northumberland Counties of East Central Ontario, Canada. Propagation information as well as antenna designs and home brew projects and Club News. Many links to Amateur Radio information

Otto Engineering - OTTO Communications designs and manufactures audio accessories for two-way radios used in public safety, police, fire, retail, hospitality manufacturing and other markets.

Creative Design Corp. - Reliable antenna rotators from japan

Greenstone USA Priority listing - Manufacturer & distributor of vacuum tubes for all applications, we guarantee best service,pricing & delivery and we also guarantee sameday shipping.

Adjusting Morse Keys and Paddles - These instructions use simple, generally familiar examples of equipment types and are designed to help you find the adjustment that suits you best

Surpluss staff - Tubes, military manuals and surpluss

CES Product Manuals - CES Wireless Technologies is a world leader in the design, manufacture and implementation of Wireless Signalling products - Including GPS, AVL, MDT's, Mobile Data Terminals, CTCSS, and Microphones

TestParts Sales Company - TestParts.com carries RF Microwave WiFi Coaxial Attenuators Coax Adapters Dummy Loads Waveguide Oscilloscope Probe Leads DMM Manuals RF Switch Relay SurplusSales Bristol Spline Pocket Toner Tubes Digicon Heliax RF Parts Oldaker Test Leads Silver PL-259s

Sandys CB Shoppe - Sandy's CB Shoppe. We sell CB's, VHF radios, and CB accessories, service and install CB / VHF radios, Affordable custom electronics design

Hungarian Radio - Radio Budapest is the external service of Hungarian Radio Company Limited, the public service broadcasting organisation.

Nec2Go - Powerful antenna modeling tool using NEC 2 computing engine. Nec2 specifically provide users, either those experienced with the Nec2 processes, or for those who are neophytes but want to model their own antennas. Nec2Go uses a simplified process for defining the antenna structure and then providing view of the structure, plots (2D and 3D) and other significant data that is pertinent to the design. This simplified process uses an edit file with equations for all definitions.

mvLearning - Educational software for Palm Pilot and Windows that quickly teaches Signal Flags and Morse Code using mnemonic techniques and a well designed flashcard program