tube design

KN4LF Antennas - Antenna design and LW, MW, SW and Amateur Radio dx'ing.

50 MHz Antennas by DF9CY (4 & 6 Element)  ^pop - Two well performing 50 MHz antennas designed with W7EL EZNEC along to many other antenna projects and related articles

Reflected W Beam - Hexagonal Wire Beams for 40-10m from DL7IO, different mono/multiband designs with building descriptions and model files for EZNEC

Tube Collectors Association - Tubes and antique radio buy and sell classified ads

Radio Boatanchor parts - Knobs, slicers and antique radio parts for heathkit Johnson Kenwood Hallicrafters Hammarlund and many more

Old Radios - Dedicated to the collection and preservation of old radios, both tube and transistor.

OH2GI Ham System - All-mode contesting and logging software system designed primarily for on-line operation of HF digital and CW radio stations through Terminal Node Controllers (TNC)

Pacific IOTA Numbers - IOTA Designation for The Hawaiian Islands

Matt's Media Network - 5 Webcams, SWL info, Top 100 shortwave sites, Webcam Mania Top 100, Matt's Banner Exchange.

Signal Engineering - Signal Engineering technologically advanced antennas with modern design and construction technique. Up to date information about current line of high performance 10 and 11 meters antennas.

KMA Antennas - KMA Antennas specializes in HF - VHF - UHF Log Periodic Antennas, unique antennas for the Six Meter band and custom antenna designs.

Q-PAR Microwave Antennas - The company (founded in 1973) excels in the research, design, development and manufacture of microwave antenna systems & components. Our range includes horn, reflector, sinuous, spiral, LPDA, helical antennas, etc; antenna positioners, and many bespoke components.

Piccon - PicCon is a PIC microcontroller based radio controller designed for hidden transmitter hunting

HD Communications - Rf Connectors,RF Amplifiers,RF Filters,HF cable and accesories. Tower hardware valves and tubes

Valve radios - Viking SW design and produce valve (tube) receivers for the ham and SWL.

Ameritron  ^pop - Manufacturer of amplifiers, antenna switches antenna Tuners, wattmeters and relay buffers, amplifier accessories, antennas and tubes and parts

Heathkit SB-220 and SB-221 essential mod - Modifications to avoid damage when 3-500Z tubes fail.

Camellia Trophy Shop - Custom Engraved QSLs, Designed On-Line

YPlog - YPLOG logging software for Windows support Icom and Kenwood Radios, map programs and a program for coaxial trap design.

AALog by RZ4AG Priority listing - AALog is a comprehensive logger program designed for amateur radio station operators. QRZ,Buckmaster,Flying Horse lookup, CW/RTTY/PSK31 support, Digital voice processor. DXCC,WAZ,P75P,WAS,JCC,WAJA,WAIP,IOTA,Russia tracking. Many other useful features. eQSL.cc compatible. It look like your paper log and use all power your PC

MRX Software - MRX Morse Code for Windows 9x/NT is a program designed to teach morse code receive and transmit using the benefits of Multi-Media PC technology

SOFT990 - SOFT990 is a freeware designed for the transceiver YAESU FT-990. Running also with FT-840 FT-890 FT-900 FT-920 FT1000MP FT-1000D

Tunekit - Filter Tuning Kit for Windows is a electronic filter synthesis program and a practical filter tuning aid for actually designing and building a working filter

Speaker Design - Java applet to design speakers

JF1OZL  ^pop - Large list of homemade projects and designs