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San diego dx club

An Arduino based remote monitoring system. The Remotino is a remote monitoring system based upon two Arduino Nano units RemotinoSampler and RemotinoViewer that are connected

Various info on KE2UK with links to other radio sites and much much more ...

How much better is an N over SO-239 at VHF/UHF, a discussion topic at eham

2002 CQ WW CW antennas and shack

The Milford Amateur Radio Club, Established in 1961 Milford, Michigan

The program consists of tabbed pages for various antenna and transmission line calculation. You can compute the values for an inverted L network that will allow you to match the 50 ohm output of the radio, or you can compute the necessary length in the units of choice for a 5/8 wave vertical for 10 meter band.

The Bristol Amateur Radio Club's purpose is to: Facilitate the exchange of information and general cooperation between members to promote amateur radio knowledge, fraternalism and individual operating efficiency

Managed by k3tkj, offer to ham radio operators free space for web pages and email forwarding.

Turkey Network List, Turkish bulletins and Packet downloads.

Reviews of the popular portable HF transceiver by Elecraft

The IZ3MEZ Web DX Cluster presents real-time amateur radio DX spots across 20 distinct frequency bands, spanning from **LF (2190m)** at 135.7 kHz up to **SHF (QO-100)** at 10499 MHz. It displays the DX callsign, frequency, DXCC entity, spotter callsign, and spotter DXCC entity, along with any accompanying comments. The cluster also lists various operating modes such as CW, RTTY, FT8, FT4, FT2, PSK, and SSTV, and supports special operating activities like QRP/P and specific award programs including IOTA, POTA, SOTA, WCA, and JOTA. The cluster's interface provides a dynamic feed of the latest 50 spots, continuously updated with precise timestamps. It offers direct **Telnet protocol** access for users preferring a command-line interface, with configuration instructions provided. The resource also integrates with other spotting networks like RBN and PSK Reporter, enhancing its utility for DXers and contesters seeking propagation information and activity monitoring across a broad spectrum of amateur radio frequencies.

Providing real-time weather spotter reports for the following counties: Delaware, Fairfield, Fayette, Franklin, Hocking, Licking, Madison, Pickaway, Ross and Union.

EA5FWW Francisco S?nchez Murcia Spain

Converting the Jabra A210 Bluetooth Interface for Ham Radio

The RFzero is a multi function signal platform developed for radio amateurs who wants to extend the Arduino skills in combination with RF. The RFzero board is largely compatible with the Arduino Zero and Arduino M0 boards, however, it has been carefully designed for flexible use in RF applications and with attention to the frequency spectrum and stability performance.

Arizona contest club for big guns, little pistols and cap guns, from experienced to new contesters.

NS8O portable generators

Spanish ham radio chat

CRAM - Club Centro Radioaficionados Montevideo, CX1CCC, Montevideo, Uruguay

Much information about 50 Mhz and 2 meters : log , info , links .Also J28VS log.

General information page including contest scores, station pictures

A CW sidetone bypass for the NESCAF audio filter, a small and low cost circuit that works great.

1500 watts PEP SSB is the power handling capability of the MFJ-989C HF Antenna Tuner, a popular choice among amateur radio operators. Users have shared a wide range of experiences, with some praising its durability and performance over decades of use, while others criticize its build quality and accuracy. The tuner features a built-in dummy load, SWR-wattmeter, and a balun for balanced line feeders, making it versatile for various antenna setups. However, discrepancies in RF power readings and SWR measurements have been noted, with some users finding the dual scale meter to be off by about 20% compared to a Bird wattmeter. Long-term users report that the MFJ-989C performs well with proper antenna setups, but caution against tuning at high power without initial adjustments at lower power levels. Some have experienced issues such as arcing when exceeding 400 watts, while others have had no problems even at higher power levels. The roller inductor and capacitors are functional, though some users have had to perform maintenance like tightening screws or cleaning components to ensure reliable operation. Despite mixed reviews, the MFJ-989C remains in production, suggesting continued demand. It's a tuner that requires careful handling and possibly some DIY fixes to achieve optimal performance.

This document has been produced by examining the data going into and coming out of the TH-D7 HT from Kenwood.

This simple beverage ntenna is easy to make, easy to setup, and it offers great RX performance.

CBS is a program that produces statistical data from a Cabrillo file by K5KA and CBSW windows version by N6TV

Ham radio site with personal info, search facilities and some links pages

Low Country Amateur Radio Club Summerville, South Carolina 147.060+ / 147.030

In portuguese by PY4ZBZ

A cavity filter, often a critical component in _duplexer_ designs, functions as a sharply tuned resonant circuit, allowing only specific frequencies to pass while attenuating others. These filters are essential for maintaining signal integrity in environments where multiple transmitters and receivers operate simultaneously on closely spaced frequencies, such as in repeater stations. The article details how these filters, sometimes referred to as _notch filters_, achieve high Q factors, which are crucial for their performance. Understanding the principles of cavity filters is fundamental for any amateur radio operator involved in repeater operation or designing custom RF front-ends. The discussion covers the basic circuitry and operational characteristics that enable these devices to provide significant isolation, often achieving **-80 dB** or more between transmit and receive paths. This level of isolation is vital for preventing receiver desensitization and intermodulation distortion. Properly tuned cavity filters ensure that a repeater can transmit and receive simultaneously on different frequencies without self-interference, a common challenge in VHF/UHF operations.

BCHF 14.316 MHz Broadcasters HF NET where radio/tv broadcasters-engineers meet 2300 UTC Sunday's

Moonbounce is the ultimate long path DX. It is exciting and allows you to literally work the world on VHF and UHF. It is not as difficult as you may think. Here is how to get started on this most exciting mode

Oost Vlaamse Radio Club Belgium

All ham radio inforamtion needed from M?xico.

Ullung & Tok-do Island IOTA AS-045

Homebew a frequency marker by 7N3WVM

Spectrum manufactures very high-performance, low-cost, GPS-disciplined time and frequency reference standards for industry, scientific, calibration, broadcast and amateur operators.

Article about a high-gain, narrow-band version feature 7.15 dBd and a F/B 13dB with details on how to setup in array mode

10 GHz amateur band transverter

The Denton County Amateur Radio Association is located in Denton, Texas

A NiCAD Battery Charger with Current and Voltage Limiting

You can find all about awards and dx in argentina

A simple freeware scanner program for the Kachina DSP505. The software does NOT control the radio thru the interface port - it works in conjuction with the Kachina control software using the file interface

Another currency converter

Measure the AC current flowing through your appliances

TL5A & TL0R Website wit log and photos

Home page of the parallel lines contest group - g4lip/p