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• 13 cm Helix Antenna  ^pop - Here is the design of a 2.4 GHz antenna that is ideal for amateur satellite communications. This antenna is easy to assemble because the design itself tolerates inaccuracies in the construction without really affecting performance.
  [ Hits: 65539 | Votes: 90 | Rating: 6.04 ]

• Use of tripods to assemble and balance big antennas - Here is a way to ease assembly and balancing of a large antenna. The elements and boom are assembled separately in most cases. Once they are all together set up 2 tripods in the assembly area and put the boom on them.
  [ Hits: 2160 | Votes: 1 | Rating: 10 ]

• Dish 802.11 Wireless Networking Antenna - This antenna modification is for the IEEE 802.11b networking protocol that operates at 2.4 GHz. It can be scaled easily to the 5 GHz frequency used by IEEE 802.11a by simply scaling the dimensions on the feed can and the excitation antenna to 2.4/5 = 48% of the dimensions shown above.
  [ Hits: 9443 | Votes: 8 | Rating: 6 ]

• A beginner's guide to RTTY contests - A pdf file with review of RTTY contests software available on the net and information on how to operate a RTTY Contest, by RSGB.
  [ Hits: 2226 | Votes: 1 | Rating: 10 ]

• WAEDC-Contest - WAEDC contest page
  [ Hits: 390 | Votes: 2 | Rating: 10 ]

• Foreign postage rates - Updated list of postage costs and conditions in different parts of the world by K4HB
  [ Hits: 687 | Votes: 4 | Rating: 4 ]

• K8GP Delmarva VHF and Microwave Society - K8GP web site, home of the Grid Pirates Contest Group.
  [ Hits: 807 | Votes: 6 | Rating: 8.5 ]

• Shure Incorporated - Microphones and Audio Electronics - Shure incorporated, microphones and audio electronics
  [ Hits: 1485 | Votes: 1 | Rating: 5 ]

• Near-Real-Time F2-Layer Critical Frequency Map - This map can be used to determine the frequencies that will always be returned to the Earth. Transmitted frequencies higher than the indicated contours (which are given in MHz) may penetrate the ionosphere, resulting in lost power to space. The map shows the radio auroral zones as green bands near the northern and southern poles.
  [ Hits: 5270 | Votes: 24 | Rating: 4.84 ]

• All American - Distributor of electronic components, ull range of semiconductors (active components), including relays, circuit breakers, transistors, diodes, memory devices, microprocessors, microcontrollers, and other integrated cuircuits, as well as passive components, such as capacitors, resistors, inductors, and electromechanical products, including cable, switches, connectors, filters, and sockets.
  [ Hits: 1116 | Votes: 0 | Rating: 0 ]

• Kent Communications Inc. - Our goal is to provide the Highest Quality Products and Competent Technical Services at very competitive rates to the Telecommunications and Recreational Industries.
  [ Hits: 743 | Votes: 3 | Rating: 10 ]

• NDB Weblog - Many NDB radio enthusiasts publish their reception logs on the web. A completely separate system designed for individual listeners to make their own logs and obtain statistics on NDBs, DGPS and now Navtex Stations they have received. Log listings can be exported in a multitude of formats and then emailed to the NDB List
  [ Hits: 1454 | Votes: 3 | Rating: 9.67 ]

• SignalGen - SignalGen is a free (GPL) Linux (Xwindows GUI-based) utility that generates relatively low frequency signals with the use of a PC sound card. It is an entirely suitable replacement for a hardware signal generator if one doesn't require signals of a frequency higher than about 50 KHz. SignalGen creates any frequency between a fraction of one Hertz and an upper limit determined by your sound card's capabilities.
  [ Hits: 1836 | Votes: 2 | Rating: 10 ]

• EggsHam - EggsHam is a PalmOS application that generates (and grades) _practice_ amateur radio licensing exams. It is for people interested in obtaining an amateur radio license in the US, who want to practice for the Technician, General, or Extra written exam.
  [ Hits: 1003 | Votes: 4 | Rating: 9.75 ]

• Build An Audio Speech Processor - When one operates at low power on SSB, speech processing becomes almost essential to get through the QRM. The circuit is a low cost speech processor that will perform well with a minimum of construction effort.
  [ Hits: 4089 | Votes: 13 | Rating: 7.3 ]

• Soldering PL-259 Coax Plugs - An illustrated and complete guide to soldering PL-256 coax plugs
  [ Hits: 4936 | Votes: 3 | Rating: 1.67 ]

• Simple Reverse Polarity Protection - This simple modification is applicable to pretty much any 12 volt operated, positive earth equipment. by Chris Cox, N0UK, G4JEC
  [ Hits: 1647 | Votes: 0 | Rating: 0 ]

• The MGM Interface - General purpose RTX-PC sound card Interface for MGM (Machine Generated Modulation)
  [ Hits: 523 | Votes: 1 | Rating: 10 ]

• Made your Iambic keyer - This iambic keyer uses a PIC16C84 or PIC16F84 microcontroller to generate the dot/dash timing and key the transmitter.
  [ Hits: 4402 | Votes: 4 | Rating: 5.5 ]

• The Basic Soldering Guide Photo Gallery - These photos illustrate the basic steps in making a perfect solder joint on a p.c.b
  [ Hits: 934 | Votes: 3 | Rating: 8.33 ]

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