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Since 1922 Tampa's largest Ham organization. Dedicated to hams by hams. Classes in theory, code, and experimentation are a regular event. -
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Gamma match antenna is an antenna 1/2 additional lambda with the impedance matching more flexible arrangements (var capacitor) by sliding through the gamma match/road. -
Article on radiation patterns of small loops, equivalent circuits of loop antenna, small loops as receiving antennas, ferrite loops -
German page about packet radio, english version available -
This purpose of this page is to give a brief description of a 70 MHz transverter that has been published in the Danish amateur radio magazine "OZ" -
If you are interested in the environment, the weather and other natural phenomena then there is something magical about being able to see pictures of the earth from space just as it is right this minute. One way you can do this is by receiving images from weather satellites. -
This project is an attempt to build a portable standalone VNA (Vector Network Analyzer). -
G3WZT John Matthews project of a 600 Watt solid state linear amplifier for the 6 meters band -
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Calculate design for a quadrifilar helicoidal antenna -
This resource details the conversion of an 80m elevated vertical antenna to include 160m operation, focusing on a relay-switched design over a trap-based approach. It presents specific feedpoint impedance values, such as **32 ohms** for 80m and **14 ohms** for 160m, and discusses the challenges of SWR drift encountered with the prior trap system during RTTY contesting. The article thoroughly explains the design choices for elevated radials, referencing _N6LF QEX data_ to debunk common myths regarding radial length and height, demonstrating that non-resonant radials can offer superior current uniformity. The construction section provides practical insights into building the vertical, including guying strategies, material selection from scrap pipe, and weatherproofing the relay assembly. It highlights the use of a common mode choke for the relay switching line, measuring approximately 5K ohms on both 160m and 80m, and details the L/C matching network's role in achieving a 50-ohm match at the end of a 300-foot RG-11 run. The author describes a precise VNA-based radial trimming procedure, achieving resonant values within a 3 KHz range. The content emphasizes the practical application of theoretical antenna principles, particularly concerning the interaction between the vertical element, cap hats, and the matching network. It offers a candid assessment of component selection, such as using junkbox parts and acknowledging the need for future upgrades to static drain resistors. The article serves as a comprehensive case study for advanced antenna builders tackling multi-band vertical designs. -
706 MKIIG picture and specifications by rigpix db -
Excellent poster representing the electromagnetic spectrum from 31.2 mHz to 6.52 EHz, PDF file poster designed by Anthony Tekatch -
G3TXQ pages focuses on understanding the HexBeam antennas. Basics, dimensions, multi band issues, antenna modeling. -
Power supplies, electrical testers, battery analyzers, cable tester, rf generators, spectrum analyzers, Digital/Analog Oscilloscopes, Multimeters , attenuators, frequency counter -
Schematic for Data, power, CAT, Key and Mic connection interface cable -
Freeware windows program by VE3NEA that allow to view and edit the Master Callsign Database file used in many contesting programs, import and export callsigns, auto-download announced DX operations. -
Article on PC to radio interfacing by Paul Umbdenstock, WA1VOA -
Developed by Japanese 6 Meter Hams in the 1970's can be designed and built for almost any band -
ARRL comparison of HF transceivers, including Elekraft, TenTec,Icom, Yaesu and Kenwood recent transceivers based on QST product reviews -
Must modern HF transceivers be treated as black box appliances? VE1FA doesn’t think so, and his experience with the Kenwood TS-850SAT bears him out. -
A Simple Project: One Transistor TRF Regenerative RX -
This program displays solar-terrestrial data for radio waves propagation that is provided by the N0NBH web-service. -
You can use almost any Icom handheld to contact your 2720H back in your vehicle for crossband repeating. -
Demonstrates the design and construction of a 9-element Yagi antenna for the **70 cm band** (432 MHz), based on the DK7ZB concept. The resource details EZNEC+ calculations for a single antenna, providing gain, sidelobe suppression, and front-to-back ratio figures. It also presents a comprehensive analysis of stacking two such antennas, including optimal stacking distance (1000 mm) and the resulting performance enhancements for the stacked array, such as an increased gain of 17.03 dBi. The article includes detailed drawings, wire file dimensions in millimeters, and azimuth/elevation plots for both single and stacked configurations. Practical construction steps are documented with original photographs, illustrating element mounting, the **28 Ohm matching system** using two quarter-wave 75 Ohm transmission lines, and the critical N-connector wiring. It also covers the iterative process of fine-tuning the driven element length to achieve a return loss of 20 dB, validating the EZNEC+ simulation results with actual measurements. -
This free software is an application solely for the use of controlling the Kenwood TS-480. Can be used to edit, save, and export to the TS-480 information such as Memory, Menu, and Auto Mode frequencies. -
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Yaesu MD-100 microphone schematic wire diagram with pin out -
Remotely controlled antenna switch that can switch between 5 antennas -
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VA3EXT 5 element beam antenna for 6 meters band -
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Excel spreadsheet that help calculating dimensions of a high efficiency magnetic loop antenna for HF bands. Giving in input the loop perimeter, loop diameter and loop conductor will calculate electric characteristics, bandwidth, and efficiency -
Daily updated news on events in Lebanon and the MEA. Official web site of the FPM (Tayyar watani Horr) a lebanese political group lead by General Michel Aoun, working for a free and sovereign Lebanon -
A pdf file with schematics of an ssb and cw filter AF amplifier -
This is a command-line or DOS program to convert a Cabrillo file to ADIF. The fundamental purpose is to take the output of a contest logging program (such as TRLog or CT) and prepare it for importing into a general-purpose logging program -
Choosing the right antenna for you, by Lewis G. McCoy W1ICP -
GES Mat?riel de Radiocommunications -
This application note is designed to help the reader understand how balun transformers can be used in today's RF/Microwave communication applications. -
Here is a way to ease assembly and balancing of a large antenna. The elements and boom are assembled separately in most cases. Once they are all together set up 2 tripods in the assembly area and put the boom on them. -
DG6RBP homebrew project for a USB cable progtamming interface for the Yaesu VX-2 radio -
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A 50 foot tower setup with pictures and installation details -
A Low -Power, Distributed Capacitance Twisted Loop , indoor portable HF antenna by Monty Northrup, N5ESE -
Supplier of custom designed, high performance quartz crystal filters for communications receivers and transceivers, for Yaesu Icom Kenwood and Collins radios