out of band

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out of band

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Antennas : 40M : 40 meter Magnetic Loop Antennas
  • Small Transmitting Loop Project - Article about small magnetic loop antennas with notes on realization of magnetic loops for several HF bands and the six meter band
    [ Hits: 1077 | Votes: 3 | Rating: 10 ]
Antennas : 60M
  • Dipole for 60 meter band - Short dipole for 60m tropical band ...a total of 12 meters of wire, with a diameter of about 2 mm, divided into four sections.
    [ Hits: 684 | Votes: 6 | Rating: 7.67 ]
Antennas : 6M : 6 meter Yagi Antennas
  • 3 Element Beam for 50 MHz - A six meter band 3 element yagi beam antenna project with shortened elements using coax cables with the outer ends stripped and the center conductor shorted in somewhat of a Bazooka antenna.
    [ Hits: 424 | Votes: 1 | Rating: 8 ]
Antennas : Dipole
  • QRO No-Tuner Multiband Dipole - Construction details of a multiband dipole that can can operate at high power levels, and match its 50-ohm coax feedline without a tuner
    [ Hits: 1502 | Votes: 2 | Rating: 4.5 ]
Antennas : End-Fed
  • End-Fed antenna for 17 and 12 meters - Article about an end-fed anntenna for the 17 and 12 WARC Bands. 30 meters is not included in this project. This antenna includes a 14 windings unun impedance transformer using a FT-140-43 ferrite toroid, that should be enought for a 100W PEP.
    [ Hits: 539 | Votes: 3 | Rating: 4.33 ]
Antennas : Fan Dipole
  • Caged Fan Dipole Antenna - There are a large number of antenna designs for HF. One choice out of many is the fan dipole. The ability to transmit of multiple bands without needing a tuner (and even more with a tuner) is a very desirable factor in choosing a versitle antenna for HF.
    [ Hits: 670 | Votes: 2 | Rating: 5.5 ]
Antennas : J-Pole
  • 6 m JPole Antenna - Based on original G2BCX design this J-Pole antenna for the six meter band is made with a homemade ribbon cable. The antenna shown in this article includes a coaxial cable choke feed to remove RF currents from flowing on the outer of the cable.
    [ Hits: 1766 | Votes: 6 | Rating: 6 ]
Antennas : Magnetic Loop
  • Magnetic Loop for the 2m band - Such kind of omnidirectional antenna gives the possibility to be QRV with horizontal polarisation, as commonly used for the CW and SSB section of the 2m band. This actual design shows a 1.3:1 bandwidth of about 150kHz, centered to 144.200MHz.
    [ Hits: 572 | Votes: 1 | Rating: 10 ]
Antennas : Resonant Feedline Dipole Antennas : Tuners
  • A Homebrew Z-Match Transmatch - A home made antenna tuner based on the W6JJZ basic concept that ,atches balanced loads without the use of lossy baluns, can provide band-pass filtering and harmonic attenuation.
    [ Hits: 1099 | Votes: 0 | Rating: 0 ]
Antennas : Vertical
  • The 10/15/20 Meter Trap Vertical Antenna - This antenna project came out very nice. It's a rugged homebrew multi-band trap vertical antenna that works the 10, 15, and 20 meter amateur radio bands. The antenna can be mounted on the ground or on a mast. Mounted on the ground the antenna has a low take off angle for working DX. If mounted on a mast the antenna will acheive both a low angle as well as another radiation lobe that has a much higher take off angle.
    [ Hits: 4152 | Votes: 14 | Rating: 6.08 ]
  • 7 Bands Semi Vertical Antenna - A project of a semi vertical trap antenna that can be tuned for 7 bands
    [ Hits: 1864 | Votes: 1 | Rating: 10 ]
Ham Radio : Clubs : Technical Specialty
  • Southeastern VHF society - The Southeastern VHF Society (SVHFS) is a not-for-profit organization incorporated to promote amateur radio operation on the bands above 50 MHz in the southeastern United States.
    [ Hits: 361 | Votes: 0 | Rating: 0 ]
Operating Modes : NBEMS
  • About NBEMS - Narrow Band Emergency Messaging Software (NBEMS) is an Open Source software suite that allows amateur radio operators to reliably send and receive data using nearly any computer (Windows, Mac, and Linux) and any analog radio without requiring a dedicated digital infrastructure or specialized modem hardware
    [ Hits: 311 | Votes: 0 | Rating: 0 ]
Operating Modes : VHF UHF
  • The VHF/UHF DX Book - Free to download PDF book about operating The VHF/UHF bands written in the early to mid-1990s by a team of experienced VHF/UHF DXers and equipment developers, in an effort to pass on their knowledge and stimulate further developments.
    [ Hits: 229 | Votes: 1 | Rating: 10 ]
Radio Equipment : VHF-UHF Handhelds : Wouxun KG-UV8D
  • Wouxun KG-UV8D Cross-Band Repeater - Crossband repeat operations on the Wouxun KG-UV8D dual band multifunctional two-way radio. This demo explains differences in the cross band repeater functions of the KG-UV8D.
    [ Hits: 934 | Votes: 1 | Rating: 7 ]
Technical Reference : QRM Eliminator
  • PlasmaTV QRN Eliminator - An improved version of DK9NL QRM Killer, with dedicated noise sampling antenna for completely filtering of plasma TV rattle on HF bands
    [ Hits: 897 | Votes: 0 | Rating: 0 ]
Technical Reference : Radio Frequency Interference
  • Build an All Band HF Air Core Choke Balun - The main function of the Ugly Balun is to help eliminate rf currents from flowing on the outside of coaxial cable using the principle of choke action.
    [ Hits: 780 | Votes: 12 | Rating: 7.84 ]
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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