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Query: RF
Links: 559 | Categories: 35
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Categories
- Manufacturers > Interfaces
- Technical Reference > Radio Frequency Interference
- Technical Reference > Amplifiers > RF Amplifiers Theory
- Software > RF Coverage Mapping
- Software > RF Design
- Technical Reference > Test Equipment > RF Probe
- Technical Reference > RF Signal Generators
- Technical Reference > Test Equipment > RF Sweep Generator
- Technical Reference > Sound Card Radio Interfacing
- Technical Reference > RF Design
- Technical Reference > RF Safety
- Shopping and Services > RF Tubes
- Radio Equipment > HF Amplifiers > Ameritron AL-811
- Manufacturers > Amplifiers
- Technical Reference > Amplifiers
- Technical Reference > Attenuators
- Antennas > Baluns
- Antennas > Feed Lines > Choke
- Technical Reference > Filters
- Radio Equipment > HF Transceivers > Icom IC-705
- Radio Equipment > HF Amplifiers > Kenwood TL-922
- DX Resources > Log Analysis
- Technical Reference > Radio Frequency Interference > Noise Reduction
- Antennas > OCF
- Technical Reference > Preamplifiers
- Technical Reference > QRM Eliminator
- Operating Aids > Radio Spectrum
- Technical Reference > Receiver Front-End Protector
- Antennas > Resonant Feedline Dipole
- Radio Equipment > VHF-UHF Amplifiers > RM VLA-200
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In his back office section, ON4SKY, initiates in a few articles the beginners in the art of QSLing and award chasing. -
Software Defined Radio manufacturer, SDR-IQ NetSDR SDR-IP and IF-2000 -
Thierry Lombry, LX4SKY (aka ON4SKY) has developped a excellent educational website mainly devoted to amateur astronomy but it includes also a large section dealing with amateur radio activities includes several interesting pages about radio astronomy and SETI -
A pdf file with drawings and instruction to properly assembly and solder most popular coax cable connectors -
Schematic diagram of the VLA 200 power amplifier by RM Italy -
How to make an effective RF Choke. The coiled coax choke is the easiest to make but also the least effective. This article includes some general guidelines for winding coax chokes on a 10cm PVC pipe using RG-58 or RG-213 coax cable. -
A chart presenting the results of impedance measurements made on a variety of common-mode choke implementations across the frequency range 1MHz to 30MHz by G3TXQ -
An improved version of DK9NL QRM Killer, with dedicated noise sampling antenna for completely filtering of plasma TV rattle on HF bands -
Easy to build RS232 keying interface for FSK and CW. Works with most popular RTTY software like MMTTY. Also works for with most contest software such as N1MM and Writelog for CW keying. Uses the RS232 port RTS, DTR, or TX data, optically isolated, PC boards available. -
This article includes an online calculator for a 3 element Yagi Antenna. The formula and basics theory of Yagi Antenna are also explained with examples. -
Thierry LOMBRY, ON4SKY, gives advice to amateurs about lightning protection of an hamshack, including pictures and links. -
Performance chart of VHF antennas in a stacked array -
Computer Control and Soundcard Interface for the Icom IC 706 -
A post about the construction and measurements of a Resonant Feedline Dipole cut for the 10M band -
Radio Frequency Interference To/From touch lamps and dimmers -
CAT (Computer Aided Tuning) connects computers with ham radio. Yaesu FT-890 intercace and ICOM IC-Q7 schematics by DK7IN -
Notes about generating RF sweep signals on the Arduino for filter testing, a digital version of the old Wobbulator concept -
Recordings of RF noise from personal computers, peripherals and related equipment. If you can match noise at your location to one of these files then you can be confident that you know where your noise is coming from. -
A multi-mode PC to radio interface for PSK, CW, Packet and more digital modes. -
CB Radio RF Noise Suppression -
Notes on the intensity of RF Field calculated on magnetic loop antennas. The magnetic field intensity of a mag loop is considerably higher than the E field probably due to the inductive portion of the resonant circuit creating the radiation (magnetic) in the near field -
A cheap rf signal generator for 2.4 GHz -
A simple PSK31/digital interface which can connect your transceiver to a PC soundcard for digital modes. -
The use of dummy load is mandatory for off-air adjustment of the transmitters. Build one. -
This circuit came out of some work done for two antenna analysers -
Building a Resonant Feed line Dipole for 2 Meters -
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May 2015 Radcom Article on common-mode chokes that can be used for control cables, phone lines, but mostly on typical HF antenna systems. This article explain what common mode chokes does, why you meay need one, properties common mode chokes should have, how to build and measure performances. -
Tri-Cities Frequencies, Live Scanners, CTCSS information and more -
Pictures and description of a homemade 1.3 GHz and 2.4 GHz RF Signal Source -
This article describes a generalised unit for interfacing a transceiver's TTL/CMOS interface to RS-232. -
This is a concept paper, not a constuction article. There are too many variables to propose a one size fits all design. However, this paper should give you the basic idea how to do it -
Homebrew your PC sound card to radio interface with this circuit obtained from the pages of Ernie Mills WM2U. -
A amateur radio guide to RFI, ferrites, baluns, and audio interfacing by K9YC -
Trained amateur radio communicators under ARES, RACES and Skywarn serving Harford County, Maryland communities -
This Class E RF amplifier will deliver up to 400 watts of RF output -
National rf provides consulting engineer services, and manufactures direction finding antennas, test equipment, communications receiving equipment and adjuncts, satellite antennas, voice amplification and audio equipment. -
This test circuit is easy to duplicate, and demonstrates the extreme voltages that appear in an amplifier when the load is improper for the amount of drive power applied. -
Introduction to the use of clusters and Packet Radio, hardware, settings and commands by ON4SKY -
Practival project that contains two isolation transformers, one for AF from the tranciever to the line in on a soundcard, and one from the audio out of the soundcard back to the mic / data input of the radio. Both of which are variable inside the interface via two preset resistors. -
CAT and Digital modes interface for the Yaesu FT-817 -
A simple RF sweep generator circuit diagram by JF1OZL -
Installing mobile radios in your new megabucks car can be a frightening proposition - especially if RF from your rig could damage your shiny new roadster -
Radio Free Europe / Radio Liberty is an international news and broadcast organization serving Central and Eastern Europe, the Caucasus, Central Asia, Russia, the Middle East and Balkan countries. -
Cushcraft A3S performances with the A743 kit to add 30 and 40 meters -
The function of the XPhase is based on the fact that the interfering signal, received by an auxiliary antenna, is added phase-shifted to the signal received from the main antenna. When the phase-shift is more or less 180°, the interfering signal is canceled out. -
An home made low pass filter for 70 MHz by IK0VAQ -
This project is an interface box for the Yaesu FT-817 that includes a band output port, a computer serial interface, and a remote interface for the FL-7000 solid state power amplifiers. -
Understanding and eliminating RF Interferences caused by your home devices -
Using Andrew FSJ1-50A 1/4" Superflex Heliax with PL-259 Connectors