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Antennas : 80M- An 80 m dipole antenna for restricted spaces
- You can bend the wires in a half-wave dipole so that it takes up less space, with minimal loss of efficiency.It is advisable to get the ends of the antenna as high as possible, especially if children and animals are kept in the area around the antenna, as there are very high tensions on the ends of the antenna during transmission! In Norwegian
[ Hits: 184 | Votes: 0 | Rating: 0 ]
- The Story of the Broadband Dipole
- A dipole can be broadbanded by a number of techniques including by matching with resonant sections of transmission feed lines.
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- To transform ot not to transform - Feed Lines
- Transmission lines have many uses other than simply transferring RF power from one point to another.
Impedance matching, baluns and filters are probable the most common of these.
[ Hits: 137 | Votes: 0 | Rating: 0 ]
- The Quarter-wave stub
- The Quarter-wave stub can be used for many purposes. If it is left with an open end it can be used as a notch filter to attenuate certain frequencies. A quarter wave length of a transmission line can also be used as an impedance transformer, to know more about the Quarter-wave impedance transformer
[ Hits: 134 | Votes: 1 | Rating: 8 ]
- Construction of a J-Pole antenna for 2 meter
- If you like building good antennas, this one is for you. The J-pole is a slim, omnidirectional, half-wave antenna fed at the end through a quarter-wave shorted transmission line. Its predecessor is the famous Zepp antenna developed for the Zeppelin airship.
[ Hits: 381 | Votes: 2 | Rating: 10 ]
- The W5JGV Loop Antenna
- A Shielded Low Frequency Loop Antenna, allows Simultaneous Transmission and Reception at the Same Site.
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- Indoor QRP HF Loop Antenna
- A home made magnetic loop for HF Bands. This small and compact loop is designed to support small power transmissions on HF bands, from 7 MHz to 21 MHz
[ Hits: 323 | Votes: 1 | Rating: 10 ]
- Narrow FM Contest 2020
- The ARI Club of Lecce (Italy) is proud to present the first HF FM contest. This is the NARROW FM CONTEST which will debut the 6th and 7th of June 2020. It will last 24 hours and will take place on 10 meters exclusively in the FM emission mode.
[ Hits: 82 | Votes: 8 | Rating: 8.63 ]
- Amateur Radio Modes
- A table that summarize all known amateur radio emission modes, with reference to software and platform available for digital modes
[ Hits: 207 | Votes: 0 | Rating: 0 ]
- FSK vs AFSK
- In the field of RTTY transmissions with audio boards, you can transmit either in FSK or AFSK mode. Which is better: FSK or AFSK? Advantages and Disadvantages of both methods
[ Hits: 155 | Votes: 0 | Rating: 0 ]
- Decoding Russian Meteor-M2 satellite images in real time
- The Meteor-M N2 is a polar orbiting Russian weather satellite that was launched on July 8, 2014. Its main missions are weather forecasting, climate change monitoring, sea water monitoring/forecasting and space weather analysis/prediction. Meteor-M N2 transmits images using the digital LRPT protocol at around 137.1 MHz with can be received with an RTL-SDR.
[ Hits: 199 | Votes: 0 | Rating: 0 ]
- Everything you needed to know about Radio Receivers and Scanners
- Tuning into the airwaves for new and interesting transmissions has fascinated enthusiasts since the very earliest days of radio. As a result of advances in computer and radio technology, the equipment packed radio rooms of the past are now replaced by scanning receivers sometimes just the size of a mobile phone.
What can radio receivers/scanners pick up? What types of radio receivers/scanners are there? What can and cannot be monitored legally? Best practice when using a radio receiver/scanner
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- Decoding 433 MHz with SDR
- Decoding 433MHz-transmissions with software-defined radio.
[ Hits: 199 | Votes: 1 | Rating: 7 ]
- Scanning frequencies
- HF digital mode transmissions, voice transmissions in HF and VHF Bands collected in several XLS files by Relic Radio communications
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- BridgeCom Systems Inc
- Our mission is to provide our customers with a communication solution that fits a need and provide high quality customer service. We specialize in the development and sale of communications equipment for land mobile radio, amateur radio, commercial radio and RoIP (Radio Over IP) solutions.
[ Hits: 114 | 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: 434 | Votes: 1 | Rating: 10 ]
- Interlock Monitor
- The Interlock Monitor (IM) program allows you to control and monitor the Interlock device from any computer in your network. The Interlock is an equipment designed to be used by contesters where they need to check, supervise and limit, how many radios are in transmission at any given time
[ Hits: 68 | Votes: 0 | Rating: 0 ]
- Online Morse Code Training
- Learn Morse Online in 40 lessons with this web based morse code learning program, based on the Koch method. Choose the lesson, adjust the wanted parameters, and start the transmission of a set of random characters based on chosen lesson. Recognize the code and verify it at the end of the lesson.
[ Hits: 366 | Votes: 2 | Rating: 10 ]
- Remote SDR - SDR Control
- Remote SDR is a web application allowing to remotely control an amateur radio transceiver between 1 MHz and 6 GHZ. It allows processing of Adalm-Pluto SDR in addition to HackRF or RTL-SD Reception in NBFM, WBFM, AM in addition to SSB Transmission in NBFM or SSB and more
[ Hits: 222 | Votes: 2 | Rating: 9 ]
- Transmission Line Details
- This utility program shows the impedance and reflection coefficient parameters (SWR, reflection coefficient magnitude Rho, or Return Loss RL in dB) at both ends of a transmission line and the details of power loss in the line. It includes built-in specifications for approximately 100 different line types. You can modify the specs to see how small changes affect the results or to specify custom lines. All program inputs may be changed directly or you can use spin buttons to make the changes.
[ Hits: 127 | Votes: 0 | Rating: 0 ]
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