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The Open SDR Project

Repeater system in the New York metro area Service provided by W2LIE.NET

A complete site for anyone wanting to use kites or balloons for supporting Top Band antenna systems.

Vintage and reproduction electronic parts specialist - antique radio dials and knobs, 1940-1970 era phonograph cartridges, needles, idler wheels.

Weather demodulator software, cards and antennas.

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

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

Listing of repeaters based in europe by PD2MEY

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.

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

Slinky Antenna Basics, clandestine dipole

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

Inverted vee dipole antenna for 20 meters band by VK1OD

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

Pictures of the Kenwood TS-850 manual

The K9GDT 40m receiver

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

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

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.

UHF 3 element portable antenna with gamma match by ON6MU

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

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

This tower is easy and inexpensive to build and easy to disassemble for transport.

Online Catalog & storefront (NJ) sales of amateur radio & related items.

SW receiver review's including the JRC NRD-545,WJ-8711A,AOR AR7030. Also ham transceiver reviews - misc.

Various ham radio cartoons

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

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.

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

Downloadable DOS program for propagation prediction for the serious contester.

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.

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

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

KD9JQ 2 meter GaAsFET preamplifier by KD9JQ

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

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.

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

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.

How repeaters work,with graphics and text explaining various duplex operationg modes

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

Schematics, modifications and manuals for ICOM IC-746

Using delta match with HF antennas design