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Dds data- communication Data and Tele-Communication Solutions: UMTS GSM GPRS Telemetry programmers Adeunis RF systems, antennas, radio transmission modules, oscilloscopes GPS and coax cables dealer in Holland

Decode Slow Scan TV (SSTV) on your iPad, iPhone and iPod Touch by Blackcatsystems

Yaesu FT-2000 on YouTube

How to build a phasing harness for stacking antennas

Only 2x 10ft wide, performance similar to full-size dipole, covers whole band with SWR better than 1:1.2.

How To Connect Elecraft KX3 To iPad

West mountain radio, Useful electronic hobbyist products, RigBlaster and RIG Runners products, Waukesha, WI.

A selection of alphabets used, particularly by ham radio operators, to spell out words

A google map of the UK amateur radio repeaters with clickable information

Modelling an horizontal Loop antenna at 3.5 MHz

Radio Remote Control is a complete remote control system for Amateur radio.

A simple portable VHF ground plane antenna project used for ARES activities

Open source software designed to control and program the Japan Radio Co. NRD-545 receiver.

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.

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

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

A VHF UHF handheld antenna suitable for satellite operation by LY3H include antenna plan with dimensions and pictures.

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

An home made Man-pack designed to host and FT-857, LDF ATU amd a 7Ah battery

70 MHz jpole half wave antenna by G7OGQ and G8CVF

80 to 6 meters, 2 KW, designed to be used at heights of only 25 to 45 feet, includes a twenty foot long vertical radiator

Isolation vs antenna separation an interesting article by WA6ILQ

An interesting article on loading short vertical monopole antennas, representing six different methods. Base loading, Center Loading, Top Loading, Continuous loading, half and half loading and capacitive top loading.

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

Quality amateur radio transformers and electrical supplies

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

Making portable pperations easier, N1GY present a different way to make a tilt-base and mast

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.

EF0603S is a 3 element portable yagi antenna for six meters band by YU7EF

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

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

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

9Q0HQ Congo DXPedition Online Log

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

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

Yahoo! groups discussing kenwood TS-2000

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

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

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.

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

Pre-inked - re-inkable stamps

A Co-ax Trap Dipole For 40, 30 and 20 Meters or at last that was the intention

Learn how to start using ham radio satellites for your DX contacts, PDF presentation by Dave Long

The X80 multi-band HF vertical antenna, a commercial iteration of the Rybakov design, exhibits a physical length of 5.5 meters, or approximately 18 feet, and is constructed from aluminum tubing. It operates as a non-resonant vertical, requiring an external antenna tuner for impedance matching across its intended operating frequencies. The antenna's design incorporates a 1:4 UNUN at its base, facilitating a nominal 50-ohm feed point impedance for the coaxial cable. Performance observations indicate effective operation on 40 meters, 20 meters, 15 meters, and 10 meters, with reduced efficiency on 80 meters and 160 meters due to its relatively short electrical length for these lower bands. Comparative analysis with a G5RV dipole and a half-wave end-fed antenna reveals the X80 offers a lower take-off angle, beneficial for DX contacts, particularly on the higher HF bands. Field tests conducted with an Icom IC-706MKIIG transceiver and an LDG AT-100ProII autotuner demonstrate the X80's ability to achieve acceptable SWR across 80m through 10m. The antenna's compact footprint and ease of deployment make it suitable for restricted spaces or portable operations, though its performance on 80 meters is noted as a compromise compared to full-size resonant antennas.

A short multi-band vertical antenna

San Diego Police scanner

The oscilloscope simulation shown on this website is based on the HAMEG HM203-6 20 MHz oscilloscope of Hameg GmbH in Frankfurt/Main, Germany

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

Two-meter and aircraft band receiver specifically designed for RDF on foot, sold by Bryan Ackerly VK3YNG

Kc2uoo review of the yaesu ft-450 in this youtube video