frequency

537 links - and 9 categories

3 Element Yagi Calculator - This calculator is designed to give the critical information of a particular beam antenna, in this case a three element Yagi, for the frequency chosen.
[ Hits: 437 | Votes: 5 | Rating: 5.6 ]

What is Horn Antenna - Horn Antenna - The energy of the beam when slowly transform into radiation, the losses are reduced and the focussing of the beam improves. A Horn antenna may be considered as a flared out wave guide, by which the directivity is improved and the diffraction is reduced. One of the first horn antennas was constructed in 1897 by Bengali-Indian radio researcher Jagadish Chandra Bose in his pioneering experiments with microwaves. The modern horn antenna was invented independently in 1938 by Wilmer Barrow and G. C. Southworth. This Horn model antenna is suitable employed in the UHF or SHF radio bands. Making this horn model antenna it will be easy for a beginner to make if it works in the 10GHz frequency, because small dimensions so it is not so difficult and also offers gain up to 25dBi.
[ Hits: 74 | Votes: 0 | Rating: 0 ]

Introduction to HFTA HF Terrain Assessment - A complete guide to plan antenna installation by using several tools and resources including the popular HFTA High-Frequency Terrain Assessment software distributed by ARRL. A full tutorial on how to use it and how to interpretate reports produced by this antenna setup analysis tool.
[ Hits: 138 | Votes: 1 | Rating: 7 ]

Log Periodic Dipole Array Calculator - Description and online calculator for Log Periodic Dipole Arrays LPDA are directional antennas featuring a relatively constant characteristics across a wide frequency range.
[ Hits: 225 | Votes: 2 | Rating: 6 ]

T2FD Antenna - Terminated and twisted folded dipole - T2FD is a 600-900 ohms folded dipole, terminated with resistor. Feed impedance is coupled with 50/600 ohms voltage balun. It is a wide band antenna with rather low SWR over the full designed frequency range: antenna tuner is seldom needed.
[ Hits: 486 | Votes: 0 | Rating: 0 ]

RF Trap Resonant Frequency - RF traps for a lightweight 40/30/20/17/15m inverted V dipole antenna for SOTA purposes and how you can use a modern antenna analyser to find the resonant frequency of a HF trap.
[ Hits: 199 | Votes: 0 | Rating: 0 ]

Cantenna Calculator - Aka Circular Waveguide Antenna. This online antenna calculator let you plan your cantenna for the desired frequency of operation, giving the Can diameter you have available.
[ Hits: 376 | Votes: 5 | Rating: 4 ]

Radio Scout Frequencies - Information on frequencies suggested as Scout amateur radio frequencies. These were initially suggested by the World Organization of the Scout Movement and their Jamboree on the Air organizer. As with all amateur radio frequencies they are a shared resource. If someone else is already on that frequency, move up or down to find a clear frequency for calling.
[ Hits: 45 | Votes: 0 | Rating: 0 ]

Satellite Frequency List - All Satellites Frequency List Update. A complete list of satellite frequencies available in several formats, including info on Satellite Uplink and Downlink frequencies Beacon, operative Mode, Callsign and Weather sat functionality.
[ Hits: 140 | Votes: 1 | Rating: 1 ]

Digital Mode calling frequencies - A summary of common calling frequency for each digital mode on that band.
[ Hits: 311 | Votes: 0 | Rating: 0 ]

PE0SAT Satellite Frequency List - An online reference table with Satellite information including current status, uplink and downlink frequencies.
[ Hits: 221 | Votes: 0 | Rating: 0 ]

KC2G HF MUF Propagation maps - Ionospheric propagation maps MUF and critical frequency
[ Hits: 303 | Votes: 1 | Rating: 10 ]

Yaesu FT-950 CAT Manual - The CAT (Computer Aided Transceiver) System in the FT-950 transceiver provides control of frequency, VFO, memory, and other settings such as dual-channel memo- ries and diversity reception using an external personal computer. This allows multiple control operations to be fully automated as single mouse clicks or keystroke op- erations on the computer keyboard.
[ Hits: 58 | Votes: 0 | Rating: 0 ]

Repeater-START App - The amateur radio listener for when you're not on the radio. Repeater-START, the offline repeater listing app for Windows, Linux, Raspberry Pi, Ubuntu, Librem Phone is available, Now with grid square display, topographical maps and frequency preferences
[ Hits: 151 | Votes: 0 | Rating: 0 ]

A switched Capacitor Audio Filter - Here is a rather nice audio filter for use with Ham Radio gear. It features switchable operation as a -32 dB per octave low pass or notch filter having a 200Hz-2500Hz tunable cutoff frequency, buffered input and output, switch selectable filter bypass function, and good stability. T
[ Hits: 72 | Votes: 0 | Rating: 0 ]

Bandpass Filter Calculator - Passive Bandpass Filter online calculator and filter formulas. Active Inverting Op Amp Bandpass Filters, Active Noninverting Op Amp Bandpass Filter, just enter the Low ir High Cutoff Frequency
[ Hits: 165 | Votes: 3 | Rating: 5.33 ]

RF Exposure Calculator - To use the RF Exposure Calculator, fill-in the form with your operating power, antenna gain, and the operating frequency. Depending on how far above ground the RF source is located, you might want to consider ground reflections too.
[ Hits: 102 | Votes: 0 | Rating: 0 ]

Understanding computer-generated RFI - Radio Frequency Interference (RFI) has always been a source of concern for the Radio Amateur. Until the recent introduction of complex circuitry in the home, our communications gear has been the main source of potential RFI. In this computerized age of ours, increasingly complex and sensitive receivers are being barraged by these and other sources of RFI.
[ Hits: 84 | Votes: 0 | Rating: 0 ]

Kenwood TS-680S Mod - Extend frequency coverage on the Kenwood TS-680S transceiver
[ Hits: 83 | Votes: 0 | Rating: 0 ]

2m to 70cm Transverter Circuit - A 70cm / 432 MHz Transverter Project transverter circuit is an electronic device that converts a radio signal from the 2 meter to the 70 centimeter band and vice versa, allowing a single transmitter/receiver to be used for both bands. It consists of an IF stage, local oscillator, frequency multiplier, and amplifier. The circuit must be designed for minimal signal loss, noise and intermodulation distortion.
[ Hits: 81 | Votes: 0 | Rating: 0 ]