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268 links

2 element Yagi for 50 MHz - This 6 meter 2 element yagi antenna is simple, compact and effective antenna for 50 Mhz. The design antenna was optimized with AO for best match to 50 ohms, no matching network. A choke balun is recommended to decouple feedline currents.
[ Hits: 533 | Votes: 3 | Rating: 3 ]

DL7AHW Spraycan EH Antennas - Hairspray-can EH Antennas for shortwave and online programs. Small magnetic (H) antennas (Loops) have a good efficiency for the upper bands (20/15/10 meter band) and also in contrast to E-antenna a defined radiation direction.
[ Hits: 316 | Votes: 2 | Rating: 8.5 ]

Exploring The J-Pole Antenna - The J-Pole antenna is a common omnidirectional antenna used in amateur radio, particularly on the VHF and UHF bands. This article is an attempt to explore how the J-pole antenna transforms feed-line impedance to free-space impedance, all the while providing gain found only in the more expensive commercial products.
[ Hits: 143 | Votes: 0 | Rating: 0 ]

Score Distributor - Ham Radio Contest Score Forwarder - Distributing contest scores in real time to online scoreboards. he score distributor automatically forwards any score data it receives from contest logging software to the following online scoreboards: Contest Online ScoreBoard (COSB by VA2WA,K2BB,K5ZD) Live Contest Score Server (by R4WW)
[ Hits: 120 | Votes: 0 | Rating: 0 ]

North Korea - P5/4L4FN - P5/4L4FN ED operations from North Korea from Pyongyang, DPRK 2001-2002, includes statistics and online log
[ Hits: 281 | Votes: 0 | Rating: 0 ]

Active Antenna Amplifier - Manufacturer of amplifier for small magnetic and electric receiving wideband antennas, and variable delay line kit for active antenna phased arrays
[ Hits: 279 | Votes: 0 | Rating: 0 ]

Hy-Gain TH3jr Beam Manual online - Hy-Gain TH3jr Tri-band HF 3 Element Beam Covers 10, 15 and 20 Meters assembly instruction manual
[ Hits: 180 | Votes: 2 | Rating: 5 ]

UKW-Berichte Telecommunications - On-line shop for coax cables, RF connectors, Lightning protectors, Create antenna rotators, antenna masts and mounts, amateur antennas by FlexaYagi, Tonna F9FT, ANjo-Antennen and M2 Antennas based in Eggolsheim Germany
[ Hits: 271 | Votes: 0 | Rating: 0 ]

APRS Online Passcode Generator - Generate APRS Passcode using PHP for use in Amateur Radio APRS Applications when connecting to the APRS-IS Network
[ Hits: 243 | Votes: 0 | Rating: 0 ]

Antenna Calculation Software - The program consists of tabbed pages for various antenna and transmission line calculation. You can compute the values for an inverted L network that will allow you to match the 50 ohm output of the radio, or you can compute the necessary length in the units of choice for a 5/8 wave vertical for 10 meter band.
[ Hits: 435 | Votes: 1 | Rating: 10 ]

FT CALC 1.3 - Ferrite Toroidal Core HF Calculator - This EXCEL Program Worksheet calculates the safe operating conditons for a toroidal transformer operating between 1 and 50 MHz. Manufacturer data for complex permeability, magnetic dimensions, and saturation flux density must be available. Some core types which are commonly used in amateur transmission are included. The program produces limiting winding voltages for linear operation and temperature rise over the range of frequencies and power specified.
[ Hits: 283 | Votes: 1 | Rating: 2 ]
One-turn loop inductance Online Calculator - The high-frequency inductance of single-turn loops of various shapes made of round wire can be estimated accurately with a simplified formula
[ Hits: 122 | Votes: 1 | Rating: 10 ]
Amidon ferrite toroids calculator - Select the toroid by material type and dimension of the toroid, the desired inductance and you will get the numbers of turns
[ Hits: 393 | Votes: 3 | Rating: 6 ]

BKLog - log book and contest program - BKLog is a free windows amateur log book program. Developed in VB.NET, BKLog support several integrations, and provides many features. It can be used as contest log program, allow automatic sending of CW, full transceiver control, DX Cluster access, upload to most popular online Log QSL and QRZ services, like qrz,lotw,clublog,hrdlog.
[ Hits: 483 | Votes: 4 | Rating: 6.25 ]

FreeDV plus Video - FreeDV plus Video adds simultaneous digital voice (FreeDV) to ZL2AFP's OFDM TV (see OFDM TV page listed under Software/SSTV and FreeDV page listed under Software/Digital Voice). An older version of OFDM TV is used, modified for compatibility with FreeDV. The video is 1 frame/sec, 36-lines, with full color. Total bandwidth is 3.5 kHz.
[ Hits: 414 | Votes: 2 | Rating: 9.5 ]

GridMapper WG7J - Upload an ADIF fiel and plot all worked grids in an online map. Support filtering by band, year and can export the output directly into a google map, or a google earth KML file
[ Hits: 363 | Votes: 6 | Rating: 6.83 ]

AirHamLog - Online Amateur Radio Logbook - AirHamLog is a modern logging software for amateur ham radio operators. The software works inside your browser, making it possible for you to use with any device connected to the internet. AirHamLog currently supports Windows, MacOS, Linux, iOS, and Android that works with modern browsers. AirHamLog has ability to export QSL cards as PDF files. All of your log data is stored on the cloud. You can start using AirHamLog for free today
[ Hits: 549 | Votes: 1 | Rating: 10 ]

Morse Code Trainer Online - An online morse code trainer application that allows to select the digits and play them at the wpm speed you desire. While decoding will evaluate the results and will indicate your proficiency level
[ Hits: 233 | Votes: 0 | Rating: 0 ]

FSQCall Fast Simple QSO - FSQ is a Fast Simple QSO mode designed specifically for HF. It works well under NVIS and sunrise/sunset conditions on the lower bands, and also works well for short skip and grey-line on higher bands and can be used also on VHF FM.
[ Hits: 185 | Votes: 0 | Rating: 0 ]

What is SWR - standing-wave ratio - Article about Standing-wave ratio (SWR) defined as a mathematical expression of the non-uniformity of an electromagnetic field on a transmission line. SWR is the ratio of the maximum radio-frequency (RF) voltage to the minimum RF voltage along the line.
[ Hits: 191 | Votes: 0 | Rating: 0 ]