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496 links - and 1 categories

Antennas : 2M
  • Squarooka Antenna - squared bazooka for 2 meters band - Sort of similar to the one of the 6m omni. Instead of using twin-lead, this design makes use of a more or less regular double bazooka antenna (coaxial dipole). Your attention shall be drawn to the available standart literature, such as Rothammel. In order to "compute" the dimension, Karl Rothammel mentioned that the total length of the dipole shall be 95% of the free-space wavelength. The short-circuit bridges (closing the folded dipole) are to be placed at a distance-fraction being equal to the velocity factor of the coax cable used, which will be 66% using RG-58 or RG174.
    [ Hits: 353 | Votes: 0 | Rating: 0 ]
  • Dish antenna for 2 meters band - An efficient 2 meter antenna disguised as a TV Satellite dish. This vertically polarized horizontal slot antenna, cut into the reflector of a TV dish, might be the ultimate stealth antenna.
    [ Hits: 1996 | Votes: 4 | Rating: 7.25 ]
Antennas : 40M : 40 meter Delta Loop Antennas
  • Delta Loop DX Antenna for 40 meters band - A monoband delta loop antenna for the 7 MHz. This vertically polarized DX Antenna is a full wavelength sngle side antenna and has a total length of 42.3 meters (137,1 inch) Can be easily setup with a flag pole or fishing pole as center top mast. For optimal performance lower side should be at 2 meter above the ground. This antenna offers a low radiation angle and 1 DB Gain.
    [ Hits: 431 | Votes: 3 | Rating: 6.33 ]
Antennas : 6M
  • Omni-directional Antenna for 50 MHz - This simple project, based on the orginal CobWebb-Antenna model, is about an horizontally polarized, omi-directional antenna for the six meter band.
    [ Hits: 542 | Votes: 2 | Rating: 7 ]
Antennas : Dipole
  • Speaker Wire Doublet Antenna - A portable wire antenna for the HF bands, made with a common speaker wire. In its natural form, the speaker wire acts as parallel feed line coming up to the bottom of the PVC feed point. From there, it's split into two wires, one heading out each side of the PVC tee.
    [ Hits: 390 | Votes: 4 | Rating: 9 ]
Antennas : EH
  • DL7AHW Spraycan EH Antennas - Hairspray-can EH Antennas for shortwave and online programs. Small magnetic (H) antennas (Loops) have a good efficiency for the upper bands (20/15/10 meter band) and also in contrast to E-antenna a defined radiation direction.
    [ Hits: 310 | Votes: 2 | Rating: 8.5 ]
Antennas : Fan Dipole
  • The Fan Dipole A valuable multi-band HF antenna - The fan dipole antenna as an alternative to the paralled dipole antenna, to achieve a larger bandwidth and a better tuning by decreasing elenment influences.A project based on the W6HDG original concept.
    [ Hits: 744 | Votes: 6 | Rating: 6.67 ]
  • 6 Bands Fan Dipole Antenna - Extension to an existing fan dipole originally modeled for 40 20 and 6 meters. This modification will add 80 15 and 10 meter bands.
    [ Hits: 1297 | Votes: 2 | Rating: 5 ]
Antennas : VHF UHF
  • DIY Dual Band 144-440 MHz vertical antenna  updated - A homemade VHF/UHF vertical antenna made essentially with RG58 coax cable, with a 9 turns choke balun to prevent the shield acting as a RF Radiator.
    [ Hits: 1364 | Votes: 14 | Rating: 5.5 ]
Antennas : Wire
  • Long Wire Antenna for portable operations - With the view to establish a quick and easy multi-band antenna deployment for portable and camping operations a simple long wire antenna with an earth or earth plus counterpoise arrangement with a 9:1 voltage unun including a tuner or simply with a tuner is one possible solution. With the 9:1 voltage unun and wire lengths suggested in the below tables the antenna should present non extreme impedances for all HF amateur band frequencies. This page is far from complete and represents the ongoing investigation into this type of antenna. Experiments to date seem to have raised more questions than obvious answers.
    [ Hits: 796 | Votes: 13 | Rating: 8.69 ]
Manufacturers : Antennas : HF : Active antennas
  • Active Antenna Amplifier - Manufacturer of amplifier for small magnetic and electric receiving wideband antennas, and variable delay line kit for active antenna phased arrays
    [ Hits: 279 | Votes: 0 | Rating: 0 ]
Operating Modes : Satellites : QO-100
  • OSCAR-100 WebSDR - This WebSDR, hosted at Goonhilly Earth Station in Cornwall, enables you to listen to the Qatar OSCAR-100 Narrow band transponder onboard the Es'hail-2 satellite.
    [ Hits: 604 | Votes: 3 | Rating: 5 ]
Radio Equipment : HF Amplifiers
  • Ameritron AL-82 Review - Review of Ameritron AL-82 HF amplifier, owned for three years now, and over that time, it has given me incredible performance on all bands. Inclueds a comprehensive usage report and a summary on Pro and Cons of this amateur radio RF amplifier
    [ Hits: 172 | Votes: 3 | Rating: 8.67 ]
Radio Equipment : HF Transceivers : Icom IC-705
  • Icom IC-705 Presentation at Tokyo HamFair 2019 - Early pictures and presetation of the Icom the IC-705, new all bands all modes QRP transceiver introduced at Tokio HamFair on August 31st September 1st 2019.
    [ Hits: 128 | Votes: 1 | Rating: 10 ]
Radio Equipment : HF Vertical Antenna : GAP Titan
  • Gap Titan DX Antenna Manual - Installation and assembly instructions for the multiband HF vertical Antenna by GAP
    [ Hits: 365 | Votes: 1 | Rating: 4 ]
Software : Grid Bearing and Maps
  • GridMapper WG7J - Upload an ADIF fiel and plot all worked grids in an online map. Support filtering by band, year and can export the output directly into a google map, or a google earth KML file
    [ Hits: 361 | Votes: 6 | Rating: 6.83 ]
Software : Weak Signal
  • FSQCall Fast Simple QSO - FSQ is a Fast Simple QSO mode designed specifically for HF. It works well under NVIS and sunrise/sunset conditions on the lower bands, and also works well for short skip and grey-line on higher bands and can be used also on VHF FM.
    [ Hits: 184 | Votes: 0 | Rating: 0 ]
  • WSQCall A Weak Signal QSO mode for LF/MF - Amateur Radio enthusiasts who are interested in the LF and MF bands may be familiar with WSPR and WSJT JT9. Used as a propagation probe or beacon, WSPR allows very weak signals to be detected, frequently as weak as -27dB SNR.
    [ Hits: 186 | Votes: 0 | Rating: 0 ]
Technical Reference : Receiver Front-End Protector
  • RF Front End Protector - If You are using a separate receive antennas then you need a good protection circuit to eliminate the possibility of blowing out the receiver front-end while using these auxiliary receive antennas specially on low bands.
    [ Hits: 176 | Votes: 0 | Rating: 0 ]
Technical Reference : Vector Network Analyzer
  • miniVNA PRO Modifications - The mini Radio Solutions miniVNA PRO is the only affordable vector network analyser (VNA) I know of that offers remote wireless operation. This is very interesting because it allows to measure the input impedance of HF antennas installed at height without having to deal with coax cable lengths, baluns nor common mode suppression chokes. However, to render the miniVNA PRO truly field proof, it requires a number of significant modifications.
    [ Hits: 136 | Votes: 5 | Rating: 7.8 ]

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