Search results
Query: html
Links: 2653 | Categories: 0
This query is too generic. Please try adding an additional term to focus your research.
-
A 4-Band vertical antenna that needs NO tuner, NO traps. Implement an LC matched on 4 bands with relay switching. -
The Receiver Test Data resource is a detailed review database focusing on the performance metrics of various radio receivers. The methodology involves rigorous lab measurements, often adhering to standards such as the ARRL RMDR (Reciprocal Mixing Dynamic Range) and BDR (Blocking Dynamic Range). Specific test equipment and protocols are utilized to assess parameters like noise floor (dBm), AGC threshold (uV), and LO noise (dBc/Hz). For example, the _Icom IC-7300_ is evaluated with a noise floor of **-133 dBm** and an LO noise of **-141 dBc/Hz**, providing insights into its performance under different operational conditions. The resource includes a wide range of models, from the _Elecraft K3S_ to the _Yaesu FTdx-101D_, each tested for dynamic range, sensitivity, and selectivity. The data is sorted by key metrics such as third-order dynamic range and phase noise limitations, with RMDR values calculated by subtracting 27 dB from LO noise figures. This structured approach allows users to compare different receivers' capabilities, focusing on technical specifications and performance outcomes in various scenarios. DXZone Focus: Review Database | Lab Measurements | -133 dBm | ARRL RMDR -
Calculating the length of a resonant square quad loop -
-
VE3BDB's personal page serves as a dedicated resource for members of the Radio Amateurs of Canada (RAC) residing in the Ontario South Region. Bob Cooke, VE3BDB, previously held the position of Director for this region, offering localized support and information pertinent to the RAC's activities and initiatives within Ontario South. The page likely covered regional news, events, and specific guidance for local hams, reflecting his role in facilitating communication and engagement among the amateur radio community in that area. While the page is no longer active and Bob Cooke has transitioned from his regional director role to RAC Vice President for Field Services, its original purpose was to centralize information for Ontario South hams. The content would have been tailored to address regional concerns, promote local ham radio activities, and provide updates relevant to RAC members in that specific geographic area, directing users to the main RAC website for current information. -
zLog for Windows is a freeware full-featured contest logging software that runs on Windows. It supports major international and domestic (JA) contests and is customizable to many other contests not directly supported by zLog. Features include CW keying via parallel/serial/USB interfaces, highly sophisticated TCP/IP network that allows instant synchronization of a log of an M/M station, rig control, PacketCluster connenction. By JJ1MED/AD6AJ -
A 144 Mhz Slim Jim Antenna, aluminum tubing version project by Mohammad 9W2WTF -
Expeimenting with DSP digital signal processing on Arduino -
An homebrew Lindenblad antenna designed specifically for LEOs reception. -
Free windows morse code learning program. Whether you want to learn Morse code from scratch, never having heard a dit in your life, or you just want to speed up your copy for CW contesting, CW Teacher will help -
-
A simple antenna analyser for the HF spectrum with a built-in signal generator with 3-digit LED frequency display. -
Repairing and restoring a Yaesu FL-2100Z amplifier -
The Double Bazooka Dipole is a very efficient single band antenna which is very quite,and does not require the use of a balun. This antenna consists of coax (RG58) with the shield split at the center and the feedline attached to the open ends. -
High pass filter schematics for TVI and examples of finished filters -
Telephone EMI, questions and answers on how to solve interference problems to phone lines -
A vertical antenna for Six Meters band -
A compact 2 element W8JK beam antenna for 20M to 10M bands by AF6SA -
conversion of low band VHF AWA 25M-22 carphone onto 6 metres. -
Comments received from QRP-L members concerning their experiences with GAP antennas. -
A dipole antenna for 7 MHz support for this antenna is fiberglass military mast -
A home made project, scan and monitor the 2.4 GHz band using a common MMDS downconverter. -
TenTec 1208CY 10/50 MHz Transverter modification by DF9CY -
based on an FT-1000MP Reflector discussion with Bill Heinzinger, W9OL, 15/16 November 2002 -
Repairt a Heathkit SB-220 Linear Amplifier with a bad Plate Voltage meter -
The antenna described here is a direct-connect dual-rectangle beam for use on 70 cm between 440 and 450 MHz -
An article at NFARL web site about differences in setting up a half-square antenna versus a Loop Skywire by W4QO -
Firsts pictures of Icom IC-9100 taken at Tokyo HamFair 2009 -
The Western Washington DX Club is an organization of Amateur Radio (HAM) operators who have a special interest in DX or distance communications -
An Offset Attenuator for fox hunts. -
An interactive repeater map that uses google maps to display location of repaeter types available in Italy by Andrea IW0HOG -
How to receive images from orbiting noaa weather satellites using simple receiving equipment and a computer by G4ILO -
NHARC serves the Amateur Radio community in the greater Pittsburgh area USA. -
A four elements quad antenna for 144 MHz made with PVC pipes -
A step by step approach for a ham radio vertical antenna mount using only a hole, gravel and a piece of plumbing pipe -
-
-
ARC200 is the latest software for the Uniden Sportcat SC200 and is the most versatile software available for the Sportcat Sc200 -
WA0SXV Experience with GAP Titan DX Antenna -
Settng up a 40 meter WSPR beacon based on Raspberry Pi by VA3PAW -
An HexBeam antenna project, a 2 full elements on six bands -
Guglielmo Marconi's foundational contributions to wireless communication began in 1894, inspired by Heinrich Hertz's discovery of radio waves in 1888. His initial experiments at his family home near Bologna quickly demonstrated signal transmission beyond line-of-sight, achieving distances up to **two miles** within a year. Marconi secured a patent in 1896, subsequently gaining interest from the British Admiralty after disinterest from the Italian government. By 1899, Marconi's system facilitated transmissions across the Bristol Channel (nine miles) and the English Channel (31 miles). A pivotal moment occurred in 1901 with the successful _transatlantic transmission_, defying the prevailing belief that Earth's curvature would limit practical range to approximately 200 miles. This achievement catalyzed the rapid development of the wireless industry. Marconi continued refining his inventions and, in 1909, shared the _Nobel Prize_ in physics with Karl Ferdinand Braun for their advancements in radio technology. -
AF6SA USB antenna AZ-EL rotor controller compatible with Yaesu G-5500, G-450, G-650, HY-Gain and other AC motor rotors -
A simple 50 ohm dummy load to test transmitters. includes a simple RF diode detector to measure the peak voltage, and calculate the power -
Software Defined Radio manufacturer, SDR-IQ NetSDR SDR-IP and IF-2000 -
This page describes a cheap, weather-resistant and readily available type of antenna wire by HAMwaves.com -
The collinear J-Pole, often known as the Super-J, does improve the behavior over a regular J-Pole. As many attest, there is an advantage when vertically combining 1/2 radiating sections to have a bit of separation between the half-wave end points. The Super-J has very little separation between the two half-wave radiators. -
A project that describes a build a multiband wire beam antenna. A 3 band single feed moxon antenna for 20,15,10 meters. -
Antenna model for a diamond loop wire antenna for the 40 meter band -
A page dedicated to the Quadrifilar Helical Antennas, with projects, pictures and antenna plans by OH2GVB