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two antennas

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Antennas : Baluns
  • Build your own HF balun - A balun is a MUST for dipoles or similar antennas when they are feed with coaxial cable. From the RF point of view, the shield can be modeled as two conductors, the internal shield (the real shield, this is, ground) and the external shield, who is really far to be ground. In this way, your dipole has 3 arms, the two from the dipole and the coaxial cable shield (external face)
    [ Hits: 248 | Votes: 1 | Rating: 10 ]
Antennas : Beverage
  • A Reversible Beverage at ZL3IX - How do two-wire reversible direction Beverages work, an excellent document that explains fundamentals of beverage antennas.
    [ Hits: 515 | Votes: 0 | Rating: 0 ]
Antennas : Dipole
  • Vertical dipole antenna - A vertical dipole for 10, 15, 20 and 40 meters made adapting two Hustler Model 6-BTV antennas by w6sdo
    [ Hits: 2236 | Votes: 9 | Rating: 6.56 ]
Antennas : End-Fed : End Fed Half Wave Antenna
  • EFHW autotransformer comparison - Two different ways to create autotransformer for end fed half wave wire antennas, by using ferrite or air core.
    [ Hits: 521 | Votes: 3 | Rating: 2 ]
Antennas : Four Square
  • 40 m Wire 4 Square Vertical Array - 40 meter four square vertical array using four full-size 40 meter ground plane antennas, using only two radials
    [ Hits: 1068 | Votes: 2 | Rating: 9 ]
Antennas : J-Pole
  • Improving the Super-J - The collinear J-Pole, often known as the Super-J, does improve the behavior over a regular J-Pole. As many attest, there is an advantage when vertically combining 1/2 radiating sections to have a bit of separation between the half-wave end points. The Super-J has very little separation between the two half-wave radiators.
    [ Hits: 971 | Votes: 2 | Rating: 5.5 ]
Antennas : Log Periodic
  • Practical HF Log Periodic Antennas - This QST article describes the electrical and mechanical design process for two LPs that cover the HF bands from 10-30 MHz
    [ Hits: 910 | Votes: 1 | Rating: 5 ]
Antennas : Magnetic Loop
  • Home made High Power Magnetic Loop Antennas - Magnetic Loop Antennas for The Radio Operator with Limited Space, a two part series of articles on how to construct a magnetic loop antenna, including directions on selecting high voltage tuning capacitor
    [ Hits: 896 | Votes: 0 | Rating: 0 ]
Antennas : Receiving
  • Double Half-Delta Loop RX Antenna - This wire antenna was developed to offer for a small, low-band, ground independent directional receiving antenna, it requires only two support poles. It is basically composed by two interconnected half delta loops and is better than a single flag or EWE, and almost as good as two phased EWE in the same space.
    [ Hits: 939 | Votes: 0 | Rating: 0 ]
Antennas : Spiral
  • Spiral Dipole Antennas - Experiments with spiral dipole antennas. Includes two spiral antenna designs for 20 and 40 meters band by KN9B
    [ Hits: 1164 | Votes: 3 | Rating: 10 ]
Antennas : Theory
  • VHF/UHF Antenna mounting - Mounting antenna close each other. Distance calculations and tips on setting up antennas by KB9VBR
    [ Hits: 749 | Votes: 2 | Rating: 4 ]
Antennas : Wire
  • Gieskieng Antenna - This antenna is a result of experimental work of D. H. Gieskieng, W0FK, a narrow monoband antenna, that needs only two support poles and require limited space, needs only 61 ft. for 160 meters band.
    [ Hits: 685 | Votes: 0 | Rating: 0 ]
Antennas : Yagi
  • 3 Element Yagi Antennas for 144 MHz SSB-CW - A great and efficient monoband VHF portable antenna. The article consist of two version of a 12.5 Ohm 3 elements yagi beam antenna plans for the two meter band, a full sized and a shortened version expecially designed for the SSB and CW on 144 MHz.
    [ Hits: 426 | Votes: 4 | Rating: 8 ]
Operating Aids : Beginner's Guides
  • How Far Can I Talk With My Radio? - In order to determine total distance that a transmission may be received by two elevated antennas, we must add together the radio horizon distance of both antennas.
    [ Hits: 381 | Votes: 0 | Rating: 0 ]
Radio Equipment : Reviews and Comparisons
  • Vector network analyzer comparisons - Test comparison of different Vecto network analyzers, like N2PK VNA , AIM4170 by W5BIG , TenTec TAPR VNA , IW3HEV miniVNA , MFJ 259B using a HP 3577A VNA as reference by Rudy Severns N6LF
    [ Hits: 789 | Votes: 0 | Rating: 0 ]
Software : Satellite tracking
  • HamGPS - Display your current Maidenhead locator with 10 digit precision. It also computes bearing and distance to a set of target locations using locator or latitude / longitude. Useful to align antennas in VHF / UHF / microwave DX activities. No network or fancy maps usage, so it can be used even in remote locations.
    [ Hits: 381 | Votes: 1 | Rating: 7 ]
Technical Reference : Coax Cables and Connectors
  • QRO Coaxial Relay for 50 MHz - Build a SPDT coaxial relay that can be used as a main Transmit/Receive relay or an A-B switch to select between two different 6m antennas
    [ Hits: 361 | Votes: 0 | Rating: 0 ]
Technical Reference : Receiver Front-End Protector Technical Reference : Vector Network Analyzer
  • Analyzing 6 handheld antennas with a VNA - In this article the author analyze six different type of VHF handheld antennas and as result of his self training on his new vector network analyzer published this interesting report
    [ Hits: 408 | Votes: 1 | Rating: 1 ]
  • 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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