tube design

Choke Balun Designs - In this designs G8ODE explains different methods to builds a choke balun

2 Meter J-pole from 450-Ohm Ladder Line  ^pop - Great first time J-pole project. Covers most of the basics. This small and thin design also makes it good for several stealth applications.

Quarter Wire to Copper Tube Slim-Jim - K0GKJ project of a copper tube slim jim antenna for two meter band

Antennas : theory and designs - Thierry LOMBRY, ON4SKY, develops in several long articles all you need to know about antennas, their design and performance, for both amateurs and SWL

O'Neill's Electronic Museum - Rare electronics including radios,telegraphs, test equipment, 1897 Braun cathode ray tube,vacuum tube museum, crookes tubes, geissler tubes, much more

Anthony Welsh Ltd. - A great source for hard to find HI END & power tubes & sockets, various capacitors, vacuum relays, various keys and paddles.

Play Things of Past - Vintage tubes, radios, parts, radio books and magazines, old telephones, speakers, phonographs, etc. Retail store in Cleveland, Ohio

Theoldradiofixerupperguy - The guy is dedicated to the restoration of vintage tube-type radios. Restoration of broken Bakelite cabinets is his specialty.

Dxpedition to Piel Island May 2008 Video - A mini Dxepidition to Piel Island on 24th/25th of May 2008 by the CQ CQ Portable group and the call sign will be GB0PIA.

DPD Productions - Home of the TrainTenna and MilTenna. Uniquely designed antennas for Transmit or Receive Only, Indoors and Outdoors, Railroad, Aviation, Military, Ham, MURS, GMRS, and other services.

ASTER Teleservices - Telecommunication Infrastructure jobs including the Tower and Foundation design

Electron Tubes & capacitors - Manufacturer & distributor of Vacuum tubes and vacuum capacitors.

ATSI Tubes for Broadcast and Transmitting - Matched Power Broadcast tubes 813,81A,572B,4-400A,3-500,12BY7. etc. Great prices fast delivery.

ON5UR QSL print service - We are hams who design high quality full colour QSL cards. Now we print also full colour backsides on our QSL cards. 1000 cards costs only 82 Euro. For more details write max@on5ur.be``Remember: The QSO is short, our QSL cards are forever !

YagiCAD - A freeware software package for Yagi design. This webpage also contains many sample and standard antenna downloads for experimentation.

Smith chart calculator - linSmith is a Smith Charting program, mainly designed for educational use. It allows defining multiple load impedances (different frequencies), and adding components (discrete components and line sections) in series and parallel. It plots the impedances on the screen, shows the values in table format, and is able to generate publication quality Postscript output.

AmRLog - Palm OS based shareware application by KC6AAB for Amateur Radio Operators. AmRLog is designed for logging mobile radio contacts.

MorseGen - MorseGen is a simple program the purpose of which is to generate Morse Code at whatever speed you feel comfortable reading, for practice purposes. It wasn't designed to be a tutor for those who know no Morse at all, although you might find it useful for that purpose. It doesn't have a feature for sending small character groups over and over, although this can easily be achieved by creating text files containing the character groups you want to practice.

Tube Amplifier data and tech info - Source of common model manuals and amateur help on amplifier problems for the amateur bands, Discussion of vacuum tube amplifiers. Technical information and discussion of obselete tube replacement.

A.M. tutorial - This tutorial is designed to help explain some of the concepts involved in RF power measurement for amplitute modulated signals.

144 MHz preamplifier with BF981 - Design of a preamplifier for 144 MHz with 1 dB NF and 23 dB gain using BF981. This amplifier is using a low cost silicon MOSFET (BF981 from Philips) to give more than 20 dB gain with around 1 dB noise figure on 2 meter.

Regenerative Radio Receiver Circuit - Useful and well thought out regenerative receiver design

Amateur Radio Repeater Controller - The project requirement is to design the interface to the signal channel elements after the receiver and before the transmitter

Tube Amps forum - Discussion of vacuum tube amplifiers. Technical information and discussion of obselete tube replacement

Build A Vector Network Analyzer - The VNA (vector network analyzer) is an essential tool for measuring the complex impedance of a circuit at a given frequency. Article on how to build a Impedance analyzer.