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NS8O portable generators

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

Measuring the output impedance (Zs) of solid-state broadband HF amplifiers operating in class AB eham article by ZS6BIM

Offers irlp echolink node in tulare county california

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

Home of the Pampanito Amateur Radio Club

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.

A selection of useful tables including DXCC country list , ITU countries, ISO country lists, by VE7CA

Reviews of the popular portable HF transceiver by Elecraft

Basics of crystal radios receivers and basic working priciples

2002 CQ WW CW antennas and shack

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

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

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.

10 GHz amateur band transverter

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

EA5FWW Francisco S?nchez Murcia Spain

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

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

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

Provides information and resources on Amateur (Ham) Radio from N0UN. Ham Radio Friends, Shacks and Blog by N0UN

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

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

supports three repeaters in the Florence SC area. The Club Callsign, W4ULH authorized by the Federal Communications Commission.

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

In portuguese by PY4ZBZ

General information page including contest scores, station pictures

Beacon list for 10 meters band maintained by DL7JV

Converting the Jabra A210 Bluetooth Interface for Ham Radio

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

Oost Vlaamse Radio Club Belgium

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

The Breeze Shooters is an amateur radio organization based in Western Pennsylvania, established in 1937 by a group of local hams. The club's initial focus was on fostering camaraderie and promoting amateur radio activities among its members. Over the decades, its membership has grown significantly, at one point exceeding 1,800 individuals, making it one of the larger regional ham radio clubs. The organization maintains a casual operational structure, emphasizing member participation in various aspects of the hobby rather than strict formal governance. The club actively supports and organizes events such as the annual Breeze Shooters Hamfest, a significant gathering for the amateur radio community in the region. Members frequently engage in contesting, DXing, and local emergency communications support. The club's history includes a strong tradition of mentoring new hams and providing a platform for experienced operators to share knowledge and resources. Its enduring presence in Western Pennsylvania underscores its role in sustaining local amateur radio interest and activity.

Homebew a frequency marker by 7N3WVM

TL5A & TL0R Website wit log and photos

All ham radio inforamtion needed from M?xico.

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

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

The Strathcona Radio Volunteers provides radio communication along with general manpower to public service, charity, and general events in and around Strathcona County. The club also provides backup communication to the Emergency Services of Strathcona County.

Ullung & Tok-do Island IOTA AS-045

Helps you study for the Ham Radio & FCC GROL exams. Often times, test questions are worded in ways; that fool you. RadioTelephone Tutor drills on missed questions, till you know the answers backwards and forwards. Can take entire question pools in straight, or random order. Creates a practice test; which represents what you would be given in a real exam.

eHam users review of the Ten-Tec Orion transceiver

Personal homepage of DL4TA Ralf D. Kloth

Club Radio Amateur de Drummondville Inc (CRADI)

Ham radio and cb radio italian only web site dedicated to amateur radio and citizens band

We are amateur radio operators on the Central California coast participating in all phases of amateur radio

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