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This antenna is based on a design for a portable 2 element 6m Quad by VE7CA, which is featured in the 19th Edition of the ARRL Antenna Handbook

Listing of repeaters based in europe by PD2MEY

A new and simple method for tuning traps. You need 2-3Watt of your TRX and two homemade coupling coils by DK7ZB

Free windows program to calculate magnetic loop antenna.This small loop antenna calculator allow to determine capacitance and voltage based on Loop circumference, desired resonant frequency, conductor diameter and the operating power

So you want to build a Beverage Antenna. This article offers insights on building a two-wire Beverage antenna for better reception. Key points include using long wire (at least a wavelength, ideally two), keeping it straight and away from vertical conductors, and sloping ends for noise reduction. The author recommends copper clad wire and mentions transformer design considerations for later discussion.

Inverted vee dipole antenna for 20 meters band by VK1OD

This listing was put together by ve7vdx on the USENET rec.radio.amateur.space, and is updated weekly there

Slinky Antenna Basics, clandestine dipole

The K9GDT 40m receiver

A quick and easy to build loop antenna for shortwave listeining can tune from 5 to 18 Mhz

Builing a triple ration balun, that match resonant antennas from 9 ohms to 75 ohms with 1.5:1 or less SWR

Pictures of the Kenwood TS-850 manual

A homemade antenna plan for a portable yagi beam antenna for the Six meters. Consist of a 3 elements yagi beam design include antenna dimensions, with elements lenght and spacing.

A small transmitting loop antenna for 20 metres using a aluminium bicycle wheel rim.

Presents a practical approach to constructing a portable, lightweight antenna support structure, ideal for field operations or temporary installations. The design utilizes readily available PVC pipe sections, allowing for a total height of **20 feet** and a transportable weight of **25 lbs**. Detailed material lists specify various PVC pipe diameters and lengths, along with couplers, tees, and elbows, facilitating a modular assembly that can be easily disassembled for transport. Accompanying the tower design, the resource also outlines the construction of a _MicroVert_ antenna, including formulas for radiator length, capacitance, and inductance. It provides guidance on creating a current balun using ferrite beads or a coax coil, and calculating counterpoise length for optimal performance. The antenna section includes a schematic diagram illustrating the connection of the SO-239 connector and counterpoise.

50MHz-Yagis with a new match, all lengths from 0.6-12m

Psk31 program for Linux, supports up to four simultaneous receive windows.

UHF 3 element portable antenna with gamma match by ON6MU

hamOS is a live and installable Debian based linux respin for Amateur Radio Operators. It is intended for new users with little or no linux experience. hamOS contains a variety of pre-installed applications for amateur radio like logging, homebrewing, digital modes, and more.

The AZIMUTH program plots a world map in either azimuth (beam heading) or Mercator projections. If you specify your home location in latitude and longitude, the azimuth projection is centred on your location. The Azimuth map program can display Maidenhead grids - this is useful for 6m, 2m, and UHF DX communication display. Various features of the map are: Azimuth or Mercator projections , Maidenhead grid display, Simple map zooming, Print maps with adequate resolution up to one meter sized map

An old satellite frequency list from 3 to 8475 Mhz dated 1996

Operating as a long-standing dealer for amateur radio gear, Advanced Specialties Inc. provides a range of equipment from major brands like Yaesu, Uniden, Alinco, and Icom. Their inventory includes HF, VHF, UHF, and 220 MHz transceivers, along with a wide selection of antennas such as ANLI, Comet, Hustler, and Opek for base, mobile, and portable operations. The store also stocks essential accessories like antenna tuners, dummy loads, programming software, cables, connectors, coax, microphones, batteries, chargers, and 12V DC power supplies. Beyond ham radio, Advanced Specialties caters to scanner enthusiasts with models like the Uniden SDS100/SDS200, Whistler TRX-1, and Bearcat digital scanners, covering APCO, DMR, and PL/DPL frequencies. They also carry Citizens Band (CB) equipment, including mobile and base station radios from President, Cobra, and Galaxy, along with 10-meter radios and related accessories. The business maintains a physical retail location in Long Beach, NY, and an online presence through an Amazon store, offering both in-person and online purchasing options. Customers can find repeater directories and ham license study guides, indicating a commitment to supporting the broader radio hobbyist community. The store emphasizes its role as a regional hub for radio communication sales in the NY/NJ area, providing a diverse selection for various radio interests.

Demonstrates the construction of a 2.4 GHz horn antenna, specifically designed for WiFi applications, with the potential to add several dB of gain. The resource focuses on the critical dimensions and calculations required for proper operation, including _wavelength_ (Lo) and guide wavelength (Lg) based on the operating frequency (Fo) of 2.442 GHz, corresponding to channel 7. The guide provides a table of European WiFi frequencies, ranging from 2.412 GHz to 2.477 GHz, highlighting the specific channel 7 as the design target. It details how the length of the waveguide (Lg) depends on the diameter of the enclosure, offering a practical approach to antenna construction. This project outlines the necessary measurements like Lo/4 at **31 mm** and provides a link to an external calculator for further design specifics. The horn design aims for a 30-degree beamwidth, making it suitable for focused signal transmission or reception.

Over 40 years of experience inform the reviews and commentary presented on Dave's Radio Receiver Page, covering a wide array of radio receivers and transceivers. The resource details specific models such as the **ICOM IC-R8600** SDR Communications Receiver, which is lauded as Icom's best wide-band receiver, even surpassing the IC-R9500 in performance. Other notable reviews include the ICOM IC-7300 HF Transceiver, highlighting its direct sampling SDR technology and spectrum scope capabilities, alongside numerous models from Japan Radio Co. (JRC), Kenwood, Yaesu, and various portable shortwave receivers. The content provides practical insights into the performance and characteristics of each radio, often drawing comparisons between models. For instance, the early issues with the AOR AR7030 receiver's Bourns mechanical encoders are thoroughly documented, including AOR's eventual switch to higher-quality Alps encoders. The page also features reviews of antennas like the MFJ-1026 Noise Canceling Signal Enhancer and various power supplies, offering a holistic view of radio monitoring setups. The author's "2 ear / 2 eye method" emphasizes real-world listening experiences over laboratory measurements, providing a unique perspective on equipment utility.

Linking VHF and UHF radios and repeaters around the world using a secure Voice-Over-IP system, with no hackers!

DarwinPsk is free to licensed ham radio operators and is a great application for PSK and RTTY communications under MacOSX

K0JD's home construction projects, featuring the R2/T2 modules by KK7B

Solar Flux reports, Current Alerts and Warnings from NOAA, 27 day forcast from NOAA, charts reflecting the past 7 years Solar cycle summary charts from NOAA

Method of storing my portable wire antennas.

The H-Pole is a vertical multiband wire antenna for 160-10 meters bands

Virtual Audio Cable software allows you to transfer audio streams between applications and devices. Windows commercial software, offer a trial version limited to 3 virtual cables.

2-Element parasitic Yagis for the Shortwave-Bands 10m-30m

Downloadable DOS program for propagation prediction for the serious contester.

HamFax is an application for sending and receiving facsimiles in amateur radio and for receiving public facsimile broadcasts like weather maps. Supported interfaces are sound cards and the SCS-PTCII from Special Communication Systems.

What is NVIS Near Vertical Incident Skywave. This article on NVIS (Near Vertical Incidence Skywave) explores its role in short-range HF communication, covering 0-200 miles. NVIS utilizes antennas with high radiation angles and frequencies below the ionospheric critical frequency to achieve reliable local contact. He details optimal antennas, like low dipoles, and practical tips for maximizing NVIS performance, emphasizing its advantages such as reduced noise and independent operation without repeaters. However, challenges include frequency sensitivity and the need for appropriate antenna setups at both ends for effective communication.

Eight Bands On One Coax by kh2d

KD9JQ 2 meter GaAsFET preamplifier by KD9JQ

A project by N6BG for a four element cubical quad antenna for the 2 meters band

Article and comparison between bazooka antennas and dipole, taking care of effieciency and bandwidth

Here is a circuit that will resonate a short whip antenna for the HF Bands.

This 80/160 meter antenna is constructed from six 12 foot aluminum tubes to form a slip-up mast antenna some 60 feet high by K0RWU

Amateur Radio G3TXQ Cobweb Antenna a 5 band antenna that can be quickly assembled.

10-12-15-17 meter band yagi antenna

Software to train reading Morse code or software to run CW mode or even COHERENT CW mode on your amateur radio equipment from your PC.

Illustrates the fundamental principles of radio repeater operation, detailing how different duplex configurations overcome signal limitations in varied terrains. It begins by contrasting _simplex_ communication, where all units share a single frequency, with more complex systems designed for extended range and specialized applications. The resource systematically presents each mode, from basic base station setups to advanced multi-frequency configurations. The content specifically covers hemi-duplex systems, often used in commercial dispatch, where the base station transmits on one frequency and mobiles on another, without rebroadcast. It then progresses to semi-duplex repeaters, the most common type in amateur radio, which automatically retransmit received signals on a different frequency. The explanation extends to demi-duplex and hemi-demi-duplex systems, which incorporate multiple control links for enhanced operational flexibility and secure communications, as seen in public safety applications. Finally, the resource clarifies full-duplex repeater systems, exemplified by cellular networks, where simultaneous two-way communication is achieved through distinct transmit and receive frequencies for each direction. The visual aids, including **9 distinct figures**, effectively demonstrate the signal paths and frequency assignments for each operational mode, providing a practical understanding of repeater architecture.

Using delta match with HF antennas design

About SWR, and use of SWR Meter, home made a swr meter.

This wire-beam has one radiator-element, feeded with 450-Ohm-Wireman-twinlead and needs an antenna-tuner. For the bands 6m, 10m, 12m, 15m, 17m and 20m bended reflector-elements are used. The support is a cross of 4 fibreglass-fishing-rods

Simple eprom programmer for 27Cxx family , used in TNC and G3ruh modem, eprom tutorial, schematics and KissEprom software for windows by iz7ath

The "EZ-Tuner" is a homebrew automatic legal-limit antenna tuner that covers all amateur HF bands from 160-10 meters. Using a T-network design and controlled by a BASIC Stamp BS2sx microcontroller, the EZ-Tuner will match at least a 16:1 VSWR for either unbalanced or balanced transmission lines.