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Antennas : 12M
  • Trapped Dipole for 12 and 17 Meters - A small sized and very cheap antenna project that allow you to work on WARC bands with a total gain very close to the dipole in both bands. On 12 meters is a normal dipole, while on 17 is a trapped dipole. Article in Italia
    [ Hits: 882 | Votes: 1 | Rating: 1 ]
Antennas : Baluns
  • Sleeve Baluns - Sleeve baluns are normally used at VHF and higher. As a general rule, they are not practical at HF. The balun can be inverted and used as a skirt to form part of the antenna element
    [ Hits: 1017 | Votes: 1 | Rating: 4 ]
  • Making a good balun - The normal way to make a good balun is to wind a core with a bifilar winding about 8-10 turns, and then connect the coax to one side and the antenna to the other.
    [ Hits: 499 | Votes: 0 | Rating: 0 ]
Antennas : Helical
  • Mobile Helix Antennas for HF - Normal mode helix antennas for HF mobile. Photos andn plan for a 20 meters mobile helix antenna by N2MH
    [ Hits: 13451 | Votes: 15 | Rating: 7.46 ]
  • The normal-mode helix antenna - A helix will work in the normal mode when the diameter and pitch of the helix is less than 0.1 Lambda
    [ Hits: 3054 | Votes: 7 | Rating: 5 ]
Antennas : Mobile Antennas : Receiving
  • Active receiving antennas - An active antenna is sometimes used for receiving purposes in instances where a normal antenna would be impossible to accommodate in a physical sense.
    [ Hits: 12620 | Votes: 6 | Rating: 5.5 ]
Ham Radio : Band Plans
  • RSGB Band Plans and Information - The RSGB Band Plan is normally published annually in the February edition of RadCom and additionally reviewed mid-year. It is derived from the IARU Region 1 Band Plan taking into account any proposed national variations or special amendments, which are considered necessary by the relevant spectrum manager.
    [ Hits: 551 | Votes: 0 | Rating: 0 ]
Ham Radio : Clubs : North America : USA : Iowa
  • W0CVJ Tri State Amateur Radio Club - The TRI-STATE emergency communications response team is dedicated to providing help to public service agencies with communications when normal communications are not working.
    [ Hits: 250 | Votes: 0 | Rating: 0 ]
Manufacturers : Test Equipment : Oscilloscope
  • PicoScope - Pico Technology have developed a wide range of professional PC-based instruments that offer all the functionality of conventional test equipment (DSO - digital storage oscilloscope, spectrum analyzer, meter), and also many features not normally available in this price range. Available functios are Oscilloscope, Spectrum Analyser, XY Scope, Meter and Measurements
    [ Hits: 13389 | Votes: 8 | Rating: 8.37 ]
Radio Equipment : VHF-UHF Mobile : Kenwood TM-D710
  • Using the RC-D710 Display - Using the RC-D710 Display with any HT The Display Head for the Kenwood D710 mobile APRS radio contains all of the APRS functionality in addition to the normal Radio control functions.
    [ Hits: 408 | Votes: 0 | Rating: 0 ]
Software : Antenna analysis
  • PolarPlot - Freeware antenna software that lets you see what the polar diagram of your rotatable beam actually looks like where it is operating. With PolarPlot you can measure the polar diagram of the antenna and check for abnormalities - compare plots taken before and after changes to the design or location - check the -3dB beamwidth - look at the front to back ratio - see the size and position of the sidelobes.
    [ Hits: 5985 | Votes: 10 | Rating: 5.59 ]
Software : Packet
  • MUBAY - The multiuser/multitasking BayCom Packet Terminal Driver program is a general purpose communications package for communicating with a BayCom modem attached to your IBM-PC/clone in conjunction with the TFPCX Baycom driver software. The software will also work with a normal TNC if it supports KISS mode, such as the Kantronics range.
    [ Hits: 1477 | Votes: 1 | Rating: 9 ]
  • UISS Windows UI-Packet Program - Freeware program, special and easy to use packet program for communicating with ISS, PCSat and other 'compatible' sats. Can also be used for basic normal packet.
    [ Hits: 4098 | Votes: 246 | Rating: 8.81 ]
Software : Radio Control
  • UnidenCommander - UnidenCommander, Uniden Commander provides full control over your Uniden Bearcat scanner from your PC and even adds functionality which is not normally available on your Uniden Bearcat scanner.
    [ Hits: 785 | Votes: 1 | Rating: 1 ]
Software : Spectrum analyzers
  • Fatpigdog's Real Time FFT Audio Spectrum Analyzer - Fatpigdog's Real Time FFT Audio Spectrum Analyzer. User interface has the look and Feel of an HP Spectrum Analyzer. But, in addition to the regular Spectrum Plot, it also produces detailed Waterfall plots. The user can optimize the color map, chosing from a wide assortment of color themes. This analyzer supports multiple traces, trace arithmetic and normalization.
    [ Hits: 4121 | Votes: 5 | Rating: 8.2 ]
Software : Utilities
  • Defpom's CB Radio Simulator - It is a application which can be used for troubleshooting CB radio faults, by giving a graphical display of the normal operating frequencies generated by various parts of the CB radios circuits, it can help you identify if a frequency is incorrect or even missing. Another good use for this software is simulating possible frequency expansions, as it allows you to choose any frequency that the PLL is capable of generating, so you can see what the radio will allow you to get !
    [ Hits: 1682 | Votes: 1 | Rating: 10 ]
  • RevLoad - This graphics-intensive program reveals the load on the output of a matching-network, based on measurements of the components in that network. Adjust the network (tuner) for a flat input, measure or look up the network component values and you will immmediately see the R and jX values of the load on the network, presented as both a schematic with the component values and as a Smith Chart normalized to the specified system impedance.
    [ Hits: 697 | Votes: 1 | Rating: 10 ]
Technical Reference : Power Supply
  • How to convert Server Power Supplies - The practice of converting computer server power supplies to make a very high quality high power supply at low cost is attractive. It doesn't normally require any modification to the supply but the hard part is figuring out how to trick them into turning on.
    [ Hits: 818 | Votes: 0 | Rating: 0 ]
Technical Reference : Repeater
  • How to make a MMDVM Digital Repeater - The MMDVM is a device that interfaces PC to radios, can be used with a raspberry pi, turning a normal analog radios into a digital node connected to the internet or very simply as a digital repeater.
    [ Hits: 289 | Votes: 1 | Rating: 10 ]

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