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Antennas : 160M

  • 160M Folded Counterpoise - An FCP is not magic. It has no gain. An FCP improves an antenna system by replacing more loss with less loss. Some have been able to erect better wires in the air because the small size of the FCP allowed better placement of the antenna.
    [ Hits: 252 | Votes: 0 | Rating: 0 ]
Antennas : Collinear
  • 7dB VHF Collinear Antenna - This project is about a cheap way of building a colinear antenna for VHF 145MHz, and having about 10dB more gain than that little 1/4-wave magmount
    [ Hits: 4739 | Votes: 15 | Rating: 6.41 ]
Antennas : Dipole
  • Ribbon Dipole - Ideal antenna for QRP work, as it has more gain over dipole.
    [ Hits: 1684 | Votes: 0 | Rating: 0 ]
Antennas : End-Fed
  • Delta Loop vs End Fed Half Wave on 20m - Intrigued by a German OM positive experience with a 20m delta loop, the author replicated the design, noting its favorable 50-ohm impedance compared to their 40m version. Testing against a vertical EFHW, the delta loop excelled within EU but lagged at longer distances. Despite needing more testing, the user leaned towards the EFHW for its overall performance and practicality.
    [ Hits: 123 | Votes: 0 | Rating: 0 ]
Antennas : J-Pole
  • Exploring The J-Pole Antenna - The J-Pole antenna is a common omnidirectional antenna used in amateur radio, particularly on the VHF and UHF bands. This article is an attempt to explore how the J-pole antenna transforms feed-line impedance to free-space impedance, all the while providing gain found only in the more expensive commercial products.
    [ Hits: 142 | Votes: 0 | Rating: 0 ]
  • Improving Gain of the Super J-Pole Antenna - The collinear J-Pole, often known as the Super-J, does improve the behavior over a regular J-Pole. there is an advantage when vertically combining 1/2 radiating sections to have a bit of separation between the half-wave end points. Get 0.8 dB more gain out of the trusty Super-J by replacing the traditional phasing stub with a long coil.
    [ Hits: 189 | Votes: 0 | Rating: 0 ]
Antennas : Microwave
  • Cavity antennas - Cavity antennas are weatherproof antennas for UHF and microwave frequencies. Require more metal for the same decibels of antenna gain but a cavity antenna is relatively easy to weatherproof.
    [ Hits: 305 | Votes: 2 | Rating: 5.5 ]
Antennas : Satellite
  • UHF VHF Crossed Satellite Yagi Antenna - This home made antenna provides around 10.5dBd gain on 70cm, and 6.5dBd gain on 2m, which is more than adequate to work the FM satellites with a handheld dual band radio
    [ Hits: 370 | Votes: 2 | Rating: 9 ]
Antennas : Theory
  • Measuring 2.4 GHz Helix Antennas - It is not very difficult to design and make a helix antenna for a specific frequency and gain. It is more difficult for the serious experimenter to make precise measurements of the finished antenna.
    [ Hits: 746 | Votes: 5 | Rating: 9.2 ]
Antennas : Theory : Antenna Gain
  • Antenna Gain on Trial - Most people think it's a good thing to have and the more the better. However, this is not always true - and the amount of gain is often not what it appears to be. Assuming higher gain is what you need, how do you determine what will give the best performance?
    [ Hits: 972 | Votes: 2 | Rating: 5.5 ]
  • Understanding Antenna Gain in a Few Minutes - A collection of videos on antenna gain and explanations of how some antenna designs may perform better than others based on how their radiation pattern is drawn. Understanding how one antenna can gain more in reception and transmission than another can be complicated, but with these videos the author has without any doubt made it easier.
    [ Hits: 84 | Votes: 0 | Rating: 0 ]
Antennas : Vertical
  • Homebrew 5/8 Wave HF Vertical Antennas - The advantage of 5/8 wave antenna is that it has the lowest angle of radiation and has about 1dB more gain when compared to 1/4 and 1/2 verticals. So the 5/8 should be the favourite choice for DX.
    [ Hits: 712 | Votes: 2 | Rating: 8 ]
Manufacturers : Cable and Connectors
  • Max-Gain Systems, Inc. - Fiberglass for the antenna builder, Antenna Mart quads, Bandmaster quads, transmitting components, vacuum capacitors and relays, tower accessories, gin poles, remote RF coax switches, rotating side mounts, quad spreaders, quad parts, bristol wrenches, doorknob capacitors, transmitting electron tubes, and much more!
    [ Hits: 7427 | Votes: 9 | Rating: 6.72 ]
Manufacturers : Microwave
  • Hittite Microwave Corporation - Amplifiers, filters, attenuators, mixers, PLL, switches and frequency dividers, signal generators, power detectors, transimpedance amplifiers, variable gain amplifiers and more
    [ Hits: 553 | Votes: 0 | Rating: 0 ]
Software : Antenna rotor control
  • PstRotator - PstRotator handles just about every controllable rotator in common use: Prosistel, Green Heron, HyGain, RC1 MDS, Rotor-EZ Idiom Press, Yaesu Az and many more PstRotator includes automatic tracking for satellite or EME communications, using programs like WSJT, VQLog, TACLog, Z-Track, GJTracker, EME System, Trak_SM, WXtrack, WinOrbit, Orbitron, Nova for Windows, Sat_Explorer, SatPC32, Win-Test. PstRotator supports remote control over TCP/IP.
    [ Hits: 4002 | Votes: 33 | Rating: 8.4 ]
Software : Morse Code Training
  • NuMorse - NuMorse 2.20.0.0 for Win 7/Win 8/XP/Vista/Win 10 A complete rewrite of the original NuMorse used by thousands of radio amateurs to gain and upgrade their licenses. NuMorse offers an intermediate feature set that is somewhere between the lean and mean NuCode program and the vast array of features supported by NuMorse Professional. But NuMorse is no cut-down program. It has several unique features not found in other Nu-Ware products as well as a compact and intuitive set of controls that you will be able to learn quickly.Product is no more developed and out of support.
    [ Hits: 4717 | Votes: 7 | Rating: 7.57 ]
Technical Reference : CB Radios
  • Rogerbirds HR 2510 mods - Rogerbird's Radio Modification Information, HR2510 or Lincoln Frequency Conversion Instructions, Mic Gain Modification, and more
    [ Hits: 7769 | Votes: 57 | Rating: 8.31 ]
Technical Reference : Homebrew
  • IK4AUY Sergio - Advanced QRP Low Cost Mosfets HF Linear Amplifier with schematics, IMD, gain data and more. Six articles about amateur radio.
    [ Hits: 3633 | Votes: 27 | Rating: 8.1 ]
Technical Reference : Preamplifiers
  • 144 MHz preamplifier with BF981 - Design of a preamplifier for 144 MHz with 1 dB NF and 23 dB gain using BF981. This amplifier is using a low cost silicon MOSFET (BF981 from Philips) to give more than 20 dB gain with around 1 dB noise figure on 2 meter.
    [ Hits: 17958 | Votes: 28 | Rating: 5.82 ]

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