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Contest team 9A7A, basic info and photos about our activities

History of codes of the world, russian codes, visual codes, and al long collection of telegraph codes as used worlwide including the international morse code and the relative variations

Electro-Voice Model 664 (EV 664) cardioid microphone, wiring diagram, pictures and data sheet

Adventure Radio, articles and reviews. This site has a whole host of ham related information.

The KP3AV Systems website offers a detailed listing of amateur radio repeaters across Puerto Rico, including operational frequencies and tones for VHF and UHF bands. It features sections dedicated to digital modes like DMR and C4FM, as well as information on FRS, GMRS, and MURS. The resource also includes articles on emergency communications protocols and provides access to Spanish-language manuals for various radio equipment. Recent content covers the new open-source FT2 mode for WSJT-X Improved, upcoming 60-meter band frequency allocations and power restrictions effective February 13, 2026, and discussions on 2-meter contacts with Desecheo Island from Puerto Rico. The site also presents U.S. amateur radio band plans and highlights local contesters like Manuel WP4TZ, offering practical insights into portable operations and contest participation.

QST Magazine said, We have the hardest T-Hunts in the Country

A 4-Band vertical antenna that needs NO tuner, NO traps. Implement an LC matched on 4 bands with relay switching.

Information and news about Amateur Radio in Scotland

A three band short Vee antenna is feasible with two legs per side on a dipole. 10-15-20 meters by W8HDU

Largely US based information on travel warnings, US Embassy info, Lists of Doctors/hospitals overseas, passport info, and general travel tips etc.

Located about 25 miles south of Boston, MA, near the City of Brockton.

CWS ByteMark's Baluns (Balanced to Unbalanced) and Ununs (unbalanced to unbalanced) transformers are developed jointly with Dr. Jerry Sevick, W2FMI, who is known worldwide for his work on transmission line transformers

A short multi-band vertical antenna

communication radio,CB'ers, DX'ers,photos and Qsls

K4JRG GAP titan dx specifications

W0CUO Grand Island Amatuer Radio Society. Grand Island Nebraska.

To aid in learning and improving Morse code proficiency, this resource offers an extensive collection of downloadable MP3 audio files. The content includes character practice groups, common words, punctuation, and full-length novels, all rendered in CW. Speeds incrementally increase, catering to both beginners and those aiming to build speed, with options for _Farnsworth_ spacing at lower WPM and standard spacing for higher rates. The resource also provides a Perl script, `gus_morse.pl`, allowing users to generate custom audio files from UTF-8 text. Users can download archives of sequential MP3 files, with options for English, German, Spanish, Esperanto, and Italian content. The audiobooks progress from **5 WPM** to over **40 WPM**, with some archives offering _omnibus_ collections of multiple works. The site emphasizes the importance of consistent daily practice and patient aural observation to develop procedural memory, moving beyond conscious dit and dah counting to direct character recognition. It also details the transition from Farnsworth to normal spacing, aligning with FCC and ARRL recommendations.

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

Recepteur decametrique 3 - 30 MHz Detection classique et SDR

Eham FT-1000MP review

Specialist in the design and supply of Radio Communications Equipment and Systems. West Sussex England. Antennas, traps and baluns inline isolators, Outbacker Antennas, Mobile Mounts and Accessories

Dish antenna and its theory and design for high performance applications such as satellite transmission and reception as well as microwave links. Parabolic Reflector Antenna: Dish Antenna The parabolic reflector antenna which is often called the dish antenna provides an antenna solution applicable for VHF and above where high gain and directivity are needed for all type of radio communications and radio reception.

Mailing List for the Distribution of Dr. Tims Pirate Radio New

10 meter propigation beacon project

Quality amateur radio transformers and electrical supplies

Project to build sets of band pass transmitting filters for reducing the interference between HF transceivers operated in close proximity

Satellites and Oscar 40, Microwave and ATV

Personal Blog devoted to ham radio topics,homebrew,antenna,satellite and other projects

AM stereo receivers are available, with technical descriptions of modulation and demodulation, as well as listing of known AM stereo stations.

The Double 5/8 is a natural extension of the Single 5/8 and uses a 5/8λ element for both the top and bottom radiators.

Calculating the length of a resonant square quad loop

Phased wire vertical antennas for 40 meters band

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 mini balun 1:1 4:1 project by WV0H

Homebrew project of a windom antenna, an off center fed dipole, resonating from 10 to 80 meters

This page is dedicated to amassing information on the Tentec/Globe Wireless RX-321/RX321

Personal pages on CB radio in the SE of UK and my involvment with the Tango Echo DX group

New and used books on telegraphy, key collecting, antique radio and communication-related subjects, as well as vintage telegraph instruments

What little I know about ham ballooning by Dave Mullenix, N9LTD

Award-winning MP3 Recorder software for Windows 7 and Windows 8 will capture streaming audio without using Stereo Mix feature.

Yahoo! groups discussing kenwood TS-2000

A 144 Mhz Slim Jim Antenna, aluminum tubing version project by Mohammad 9W2WTF

Since 1935 serving amateur radio in Worcester MA

Eastern washington amateur radio group

Dragoslav Dobricic, YU1AW antennex article on influence of Boom on frequency performance and how compensate it

If you can program split-frequency memories in your dual-band radio, or your dual-band radio has two VFOs, you can work an FM satellite

This is the homepage of Kayalpattinam Ham Radio Society (VU2 KYP) - Ham Radio Society from Kayalpattinam, Tamilnadu, India

Ground Plane - 1/4 wave vertical, J-Pole, 3 Element Yagi Beam and simple antenna supports

This is the official web page of the #cq11 IRC channel on Othernet Network. It was created to help users on 11m. band.