frequency

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frequency

533 links - and 9 categories

Antennas : Antenna Calculators
  • 7 Element Yagi Calculator - Online javascript antenna calculator designed to give the critical information of a particular beam antenna, in this case a seven element Yagi, for the frequency chosen.
    [ Hits: 3440 | Votes: 57 | Rating: 6.72 ]
  • J-Pole Antenna Plan and Calculator  updated - An online J-Pole antenna calculator that need just to input the frequency and calculates in inch size of each element
    [ Hits: 968 | Votes: 25 | Rating: 4.69 ]
  • Calculate Antenna Lenght in feet, inches and meters - Inches and meters Javascript Wavelength Calculator allow to input a frequency in MHz and calculate wavelenght in several units considering also fractions of wavelenght and the velocity factor. Includes an usefull inch to meter converter
    [ Hits: 502 | Votes: 3 | Rating: 4.67 ]
Antennas : Baluns
  • A Short Course On Baluns - An interesting article on basics about Baluns, intoducing the skin effects on radio frequency currents and its effects on receiving and trasmitting article by VE7FO
    [ Hits: 347 | Votes: 1 | Rating: 10 ]
Antennas : Dipole
  • The Short Dipole - There are several ways to reduce the length of a dipole and still use it as an effective antenna. Remember it is the electrical length that determines resonance. The physical length can be considerably less than a half wave length on your desired frequency as determined by 468/f MHz.
    [ Hits: 202 | Votes: 0 | Rating: 0 ]
Antennas : End-Fed : End Fed Half Wave Antenna
  • End Fed Half Wave Antenna Coupler - A home made end-fed half-wave antenna coupler with antenna lenght calculator and counterpoise calculator based on center frequency. Includes pictures and drawings along to antenna homebrewing instructions with a home made on air wound transformer
    [ Hits: 282 | Votes: 0 | Rating: 0 ]
Manufacturers : Antennas : VHF UHF Microwave : Vertical Antennas
  • James Pole Antenna - Hand-tuned, J-Pole Antennas. The James Pole Antenna is constructed of 1/2 inch Type M copper pipe, soldered together and capped on both vertical elements. Each Antenna is tuned for center frequency.
    [ Hits: 218 | Votes: 0 | Rating: 0 ]
Operating Modes : Navtex
  • NAVTEX by National Weather Service Marine Forecasts - NAVTEX is an international automated medium frequency (518 kHz) direct-printing service for delivery of navigational and meteorological warnings and forecasts, as well as urgent marine safety information to ships.
    [ Hits: 367 | Votes: 0 | Rating: 0 ]
Radio Equipment : HF Vertical Antenna : Maldol MFB-300
  • Maldol MFB-300 HF vertical antenna review - The Japanese-made Maldol MFB-300 HF vertical antenna offer extremely wide-band performance, with a specified frequency range of 1.0-60 MHz.
    [ Hits: 432 | Votes: 2 | Rating: 5.5 ]
Radio Equipment : VHF-UHF Handhelds : TYT MD-2017
  • TYT MD-2017 Review - The MD-2017 is a dual band DMR and Analog handheld transceiver with a frequency range on VHF 136-174 MHz and on UHF 400-480 MHz
    [ Hits: 318 | Votes: 3 | Rating: 4 ]
Software : Android : DX Cluster
  • BktDxCluster for Android - With BktDxCluster you can connect to all DX Cluster with DXSpider Protocol and telnet connection, filter the spots, send new spots, send commands to the cluster, set the radio to the frequency of the spot through BktRemote. Adroid App
    [ Hits: 199 | Votes: 2 | Rating: 8 ]
Software : Antenna analysis
  • Zplots - Impedance Plots with MS Excel Charts - Zplots is an Excel application that allows you to plot impedance and related data obtained from a variety of sources. You can plot on both an XY chart and a Smith chart as well as view the data in tabular format. The XY chart can be customized with your choice of trace lines. Frequency (in MHz) is always shown on the X axis.
    [ Hits: 296 | Votes: 0 | Rating: 0 ]
Technical Reference : Audio
  • 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 ]
Technical Reference : Receiver Front-End Protector
  • A Transceiver Front-End Protector - A transceiver front-end protector in high signal level environments. An homemade RF limiter to protect your receiver front-end from high radio frequency.
    [ Hits: 656 | Votes: 0 | Rating: 0 ]
  • KD9SV Front End Saver - Homemade RF limiter project, to protect the K3 receiver front-end for high radiofrequency based on the original KD9SV project.
    [ Hits: 325 | Votes: 0 | Rating: 0 ]
Technical Reference : Receivers
  • MiniTioune receiver project - The MiniTioune receiver project, developed by Jean-Pierre F6DZP, consists of the home constructed MiniTiouner hardware which interfaces via a standard USB 2.0 port to a Windows PC running the MiniTioune software. It can be used to receive satellite broadcasts transmissions making it ideal for use on Q-oscar 100 Es hail-2 without any external frequency converters.
    [ Hits: 197 | Votes: 0 | Rating: 0 ]
Technical Reference : Repeater
  • Cross Band Repeaters - Crossband Repeating is a process where a Ham transmits one signal on one band (typically UHF), and it is received by another radio with a better antenna/power installation, and re-transmitted (typically on VHF) to another radio system, or a repeater. Everyday examples of cross-band repeaters are repeater receive sites that hear the input signals on 2m and retransmit those signals on a frequency higher than 220 MHz.
    [ Hits: 206 | Votes: 0 | Rating: 0 ]
Technical Reference : Spectrum Analyzers
  • Tektronix Compatible Tracking Generator - A spectrum analyzer is always an usefull amateur radio test equipment that should be present in a radio shack. Hams can use it for testing frequency response of filters, amplifiers, and other two-port RF devices. This article illustrate a tracking generator compatible with any spectrum analyzer in the Tektronix 490- and 2750-series lineups
    [ Hits: 188 | Votes: 0 | Rating: 0 ]
Technical Reference : Standing Wave Ratio
  • 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: 190 | Votes: 0 | Rating: 0 ]
Technical Reference : Transverters
  • Transverter for the 4m-Band - XV4-10 - The XV4-10 is a linear transverter for the 4m band to be used with a 10m transceiver. Input frequency 29-30 MHz, output frequency 69.5-70.5 MHz
    [ Hits: 255 | Votes: 0 | Rating: 0 ]

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