ap communications
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Antennas : Multiband- Space-Efficient Excellence: Inverted L Multi-Band HF Antenna
- Discovering a solution for limited space, the inverted L HF antenna emerges as a stellar performer. Half the size of a dipole, it ensures optimal installation in restricted areas, maintaining superb transmission (TX) and reception (RX) characteristics. Spectrum Communications' multi-band version, featuring traps, proves even more space-friendly without compromising performance. A fiberglass pole offers sturdy support, while proper grounding, an RF choke, and occasional tuning contribute to a high-performing and reliable antenna system.
[ Hits: 167 | Votes: 0 | Rating: 0 ]
- KC7NYR Amateur Radio Site
- This Website is here to enhance the Amateur Radio experience and for those who are interested in multiple areas of our great hobby. We have information about Amateur Radio Emergency Communications. There are many areas in our great hobby that serve different capacities, ARES, RACES, NTS, FEMA, Linux, and much more.
[ Hits: 76 | Votes: 0 | Rating: 0 ]
- Spark Gap Transmitter
- The details of the spark gap transmitter and its history: how it was invented, developed and used.
[ Hits: 382 | Votes: 1 | Rating: 10 ]
- Ribbit digital text messaging mode for HF/VHF/UHF
- Ribbit is a novel digital text messaging mode for VHF/UHF communications for recreational and emergency use which radically increases the density of information transmitted by spectrum used. It leverages the computing power of the modern smartphone to increase the capabilities of any Handy Talkie without requiring any additional hardware or cable. A Ribbit message is fixed in duration at 1250 milliseconds. It is sent over audio modulation with a 2kHz bandwidth centered on 1.5kHz. It is preceded by 400ms of white noise to open analog squelch circuits.
[ Hits: 132 | Votes: 1 | Rating: 10 ]
- UltraPortable Amateur Digital Communications
- A group for sharing, learning or presenting practical ideas and field experience for Ultra portable ham radio digital comm
[ Hits: 412 | Votes: 0 | Rating: 0 ]
- Marine VHF Frequencies
- The following table is adapted from the International Telecommunications Union Radio Regulations Appendix 18, including changes adopted by the 2012 World Radio Conference.
[ Hits: 819 | Votes: 1 | Rating: 6 ]
- Scanning frequencies
- HF digital mode transmissions, voice transmissions in HF and VHF Bands collected in several XLS files by Relic Radio communications
[ Hits: 136 | Votes: 0 | Rating: 0 ]
- JJY
- JJY is a time signal transmitter operated by the National Institute of Information and Communications Technology (NICT) in Japan. It broadcasts on two frequencies, 40 kHz and 60 kHz, and is used for time synchronization in Japan.
[ Hits: 31 | Votes: 0 | Rating: 0 ]
- DIY Ham Radio Loudspeaker
- An interesting article on how build an optimal sounding communications loudspeaker capable to optimize sound reproduction at the frequency range from 150 Hz to 3 kHz.
[ Hits: 518 | Votes: 0 | Rating: 0 ]
- Signal to Noise Ratio SNR
- Signal to Noise Ratio, definition and application to Radio Communications. Signal to Noise Ratio (SNR) is a figure of merit that compares the level of a desired signal to the level of background noise.
[ Hits: 132 | Votes: 5 | Rating: 8.4 ]
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