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Antennas : 2M- Stacked 7-Element-2m-Yagis
- These yagis and groups were designed with YO7.23 from K6STI and checked with EZNEC from W7EL. With a gain of 14/17/20dBd they have a good relation between gain and mechanical problems.
[ Hits: 3897 | Votes: 6 | Rating: 4.67 ]
- A turnstile antenna for 2-meter ARDF
- Antenna design for use with hidden transmitters on international-rules ARDF events
[ Hits: 18212 | Votes: 25 | Rating: 7.49 ]
- W3FF Portable Dipole
- This is the antenna w3ff designed for his walking portable station. It is a dipole constructed out of the plastic plumbing pipe CPVC. There are telescoping whips at the ends of each side of the dipole, and these whips are adjusted to bring the antenna into resonance on each of five HF Bands 10, 12, 15, 17, and 20 Meters
[ Hits: 22058 | Votes: 14 | Rating: 8.13 ]
- Yagi Element Mounting Considerations
- One of the most important considerations when designing and building a Yagi antenna is the method used to attach the elements to a boom. This is true because the boom influences the electrical length of the elements. In this article JH Reisert explain with drawings techniques on mounting yagi antenna elements to a boom
[ Hits: 4305 | Votes: 2 | Rating: 8.5 ]
- Antennas for 136kHz
- A very long and exaustive documentation on building antennas for 136 khz. Includes links to antenna design software for longwave
[ Hits: 4784 | Votes: 4 | Rating: 8 ]
- Home Brew VHF UHF dual band antenna
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- Contructing precedure and tune up of a dual band mobile antenna. This antenna is just a 1/4 wavelength resonator for both UHF and VHF band. It provides no GAIN as compared to other multi-section design.
[ Hits: 36839 | Votes: 38 | Rating: 4.36 ]
- VHF/UHF Yagi Antenna Design
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- Design your VHF UHF Yagi antenna online, a JavaScript enhanced web page that implements the design of an antenna for 2m and 70cm bands. This page offers a streamlined experience for Yagi antenna design enthusiasts. It assumes prior knowledge of Yagi design principles, minimizing distractions with a user-friendly interface. Equipped with essential equations, it provides instant design feedback. Red font warnings indicate design limitations, ensuring practical results. Constraints include Gain (11.8-21.6 dBd) and Boom Length (2.2-39 wavelengths), with additional frequency-dependent restrictions noted in input fields.
[ Hits: 147387 | Votes: 1105 | Rating: 6.95 ]
- K8ZT's Ham Radio Resources
- K8ZT's Extensive Ham Radio Resources about QRP, Vanity Callsigns, Software, Maps, Kent State, Shack Design, Argonaut, Sommer, Log Analysis
[ Hits: 3468 | Votes: 11 | Rating: 5.91 ]
- RACOM - Radio modems
- RACOM is a Czech company specialized in design and production of radio modems and other devices for wireless data networks for radio channels from 140 to 900 MHz. RACOM radio data networks are suitable for data transfer in telemetry & SCADA applications, transaction networks, security systems, IP networks and firts of all mobile tracking and fleet management.
[ Hits: 920 | Votes: 2 | Rating: 9 ]
- CAP Wireless Amplifiers
- Design and manufacture application specific microwave and RF amplifiers, upconverters, downconverters and multifunction assemblies.
[ Hits: 786 | Votes: 4 | Rating: 7 ]
- SoftRock-40
- The SoftRock-40 is a small, low-cost, good-performing "software defined radio" receiver that plugs into a computer USB port and delivers I-Q audio signals to the computer's sound card. It was designed by Tony Parks, KB9YIG and Bill Tracey, KD5TFD as an "SDR sampler project" for hams everywhere to easily try out software defined radio.
[ Hits: 8537 | Votes: 9 | Rating: 7 ]
- Amsat DSP Satellite Transceiver Project
- The DSP Satellite Transceiver is a conceptual transceiver designed as a dedicated unit for amateur satellite operators. The initial concept was brought about by the lack of satellite functionality on modern amateur radio transceivers, and the specialized requirements of the ham radio operator who utilizes OSCAR amateur satellites.
[ Hits: 3614 | Votes: 6 | Rating: 6.67 ]
- Automatic Identification Systems (AIS)
- Automatic identification systems (AISs) are designed to be capable of providing information about the ship to other ships and to coastal authorities automatically.
[ Hits: 1467 | Votes: 2 | Rating: 1 ]
- Ham Gear
- Ham Radio T-Shirts, Caps, Mousepads,
also vintage designs! Designs include logos from Amperex, Collins, Eico, Eimac, Gonset, Hallicrafters, Hammarlund, Heathkit, Johnson, Knight, Mars, National, Swan, Skywarn and others.
[ Hits: 2860 | Votes: 1 | Rating: 10 ]
- APRS-Beacon
- The purpose of the APRS-Beacon is to provide simple APRS-compatible position beacons for up to three Objects. It is designed to 'stand alone' and does not monitor other traffic on the frequency. It can use a single-port TNC (in 'native' mode), a single- or dual-port TNC in Kiss mode or the AGW Packet Engine in order to transmit on up to four radio ports.(When running with AGWPE, APRS-Beacon will also work with Windows 2000)
[ Hits: 3421 | Votes: 7 | Rating: 2.57 ]
- HamCalc v1.3
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- HamCalc is a free collection of calculators for radio amateurs include Antenna ERP calculations,
Attenuators, Audio Filter design, Coil Winding,
Decibels, Great Circles map and calculator, HF Filters, HF Traps, Metric conversions OP Amps
QRA Locator to Latitude/Longitude, Radio Horizon calculator, Resonance Satellite orbit calculator Timer calculations (555 timer)Zener Diode calculations Download zip By G4VWL
[ Hits: 28796 | Votes: 114 | Rating: 5.57 ]
- Baudline signal analyzer
- A Linux based FFT spectrum analyzer designed for time-frequency browsing and scientific data visualization. Oscilloscope waveform, statistical histogram, accumulated spectral trace,Weak Signal reception, continuos data logging, FFT Analyzer and specialized measurement windows.
[ Hits: 12376 | Votes: 32 | Rating: 8.85 ]
- Packet Terminal Interface
- Simple Windows based TNC interface program
Designed for ARES operation, simple operator interface to connect and perform communication functions, control operator programs screens before operations
Both receive and transmit screens Simple Windows based TNC interface program Designed for ARES operation Simple operator interface to connect and perform communication functions
Control operator programs screens before operations Both receive and transmit screens
[ Hits: 11965 | Votes: 24 | Rating: 4.08 ]
- Are you ready for BPL
- Broadband over power lines (BPL) is a technique for transmission of high speed data (broadband Internet) over powerlines. Access BPL technology injects radio frequency energy into powerlines which were not designed for transmission of radio frequency energy, and leak substantial energy that causes interference to radiocommunications service
[ Hits: 671 | Votes: 0 | Rating: 0 ]
- QRM and noise reduction
- You will find on these pages my experiences and results on antennas and local/non-local QRM/noise reduction. Using a broadband vertical active magnetic loop and a home made / designed broadband amplifier. Two vertical magnetic Alford loops are used in an array.
Analog and Digital Signal Processing and a dual phase coherent Software Defined Radio (SDR) are used. By PA0SIM
[ Hits: 5085 | Votes: 6 | Rating: 7 ]
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