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Antennas : 70cm- Cross-Yagi 10el Antenna for 70cm
- 10 Elements Cross-Yagi Antenna for 433 MHz. The base of the 10el antenna is the recalculated RA6FOO antenna.Circular polarization is realized - by a phasing quarter-wave line, matching of horizontal and vertical polarization antennas
[ Hits: 173 | Votes: 6 | Rating: 8.83 ]
- Antenna too short! Inductivity matching with coil match.
- Wire antenna calculator with inductivity matching coil where length shorter lambda/4
[ Hits: 132 | Votes: 0 | Rating: 0 ]
- Extended Double Zepp NVIS Antenna Calculator
updated
- Extended Double Zepp measurements for all ham bands, and online calculator. The antenna is constructed much like an ordinary Dipole antenna but with 5/8 Wavelength Elements matched with an added Impedance Matching Section of balanced feed line
[ Hits: 123 | Votes: 3 | Rating: 7 ]
- Portable Base Matching Unit for 42 to 48 Foot Verticals
- Medium power BMU (Base Matching Unit) intended for 42 foot to 48 foot vertical, sloper, or Inverted-L antennas.
[ Hits: 83 | Votes: 1 | Rating: 1 ]
- Matching transformers for Beverage
- Building some proper matching transformer for loop on ground and Beverage antennas
[ Hits: 74 | Votes: 0 | Rating: 0 ]
- The Story of the Broadband Dipole
- A dipole can be broadbanded by a number of techniques including by matching with resonant sections of transmission feed lines.
[ Hits: 407 | Votes: 0 | Rating: 0 ]
- 1:49 unun for end fed half wave antennas
- 1:49 UNUN using two stacked FT240-43 cores for end fed halfwave antenna. To match the end fed half wave antenna to the coaxial feeder, it is necessary to have a matching network or transmission line transformer.
[ Hits: 386 | Votes: 10 | Rating: 8.1 ]
- Outdoor 80m/40m bands Magnetic loop antenna
- No matching adjustments needed. Directly perfect match to 50 Ohms using a remotely switched wideband transformer
[ Hits: 225 | Votes: 0 | Rating: 0 ]
- Angle of OCF L-Dipole Antennas
- This page is a discussion about impedance matching by Off Center Fed dipoles in the Wide L-form. When a vertical or horizontal dipole is bent into a 90 degree L-form, the impedance drops about half.
[ Hits: 75 | Votes: 0 | Rating: 0 ]
- Portable Half-Square Antenna:
- The author explores a portable version of the half-square antenna, typically a single-band structure. Using a 9:1 unun for versatility, they describe construction with speaker wire, deployment using collapsible poles, and field tests, achieving successful contacts on multiple bands. The article suggests efficient matching methods and concludes with the antenna's integration into the author's portable options.
[ Hits: 120 | Votes: 0 | Rating: 0 ]
- Stacking, Phasing and Matching Yagi Antennas
- This is a synopsis of a talk presented to the Sydney VHF DX GROUP by VK2ZAB on how, when and why is convenient to build a Yagi antenna stack.
[ Hits: 239 | Votes: 2 | Rating: 10 ]
- The Smith Chart
- This tutorial introduces and explains Smith Charts, and then gives an introduction to impedance matching. Smith Chart is a tool to visualize the impedance of a transmission line and antenna system as a function of frequency.
[ Hits: 113 | Votes: 2 | Rating: 9.5 ]
- L-Match Tuner Build for QRP Operation
- An L-Match tuner is a device that can add either inductance (L) or capacitance (C) to the antenna, bridging that gap between 5000 ohms and 50 ohms, thus matching it to the radio. The L-Match tuner is an extremely useful device that every QRP operator will want to have.
[ Hits: 185 | Votes: 0 | Rating: 0 ]
- Budget-Friendly QRP T-Tuner and SWR Bridge
- In the pursuit of an affordable matching and SWR indication solution for the Pixie-based transceiver system this T-Tuner and SWR bridge unit, while not groundbreaking, proves to be a cost-effective performer. With real-world impedance testing yielding a worst-case loss below 0.9 dB, the unit efficiently matches all bands on 80 M to 10 M ham bands, making it a valuable addition to the QRP system.
[ Hits: 49 | Votes: 0 | Rating: 0 ]
- Yaesu FT-817 Audio Enhancement: Heathkit-inspired Homebrew Project
- Inspired by Heathkit, author aimed to enhance his Yaesu FT-817 with audio and RF processing. Design goals included a compact enclosure, PCB simplicity, matching jacks, a visual meter, and a built-in signal generator. Despite challenges in finding a suitable compressor IC for a 5V DC mic jack, he chose the Analog Devices SSM2165/2166 series. Prototyping with a solderless breadboard, author planned a PCB layout for its versatile performance in communication use.
[ Hits: 80 | Votes: 1 | Rating: 2 ]
- 3D Printer Makes Ham Antenna Portable
- An end fed antenna winder design that also contains the necessary matching toroid. This would be just the thing to throw in your backpack for portable operation.
[ Hits: 214 | Votes: 0 | Rating: 0 ]
- 20 W HF Power Amplifier
- A HF power amplifier with a push-pull of AFT09MS015N. The (small-signal) gain of the amplifier is around 26 dB in the lower HF band and goes down to about 24 dB on the higher end and still around 21 dB at 50 MHz. Its input matching is relatively good at the lower HF and degrades above 10 MHz.
[ Hits: 169 | Votes: 0 | Rating: 0 ]
- Building a Robust PL519 Tube HF Amplifier
- his article explores the construction of a PL519 tube amplifier, utilizing Ulrich L. Rohde N1UL's insights. Focusing on a modest 25W continuous output, the design ensures robustness with forced air cooling. The detailed breakdown covers input matching, screen grid voltage generation, bias adjustment, anode power supply, heater power supply, and monitoring circuitry, providing valuable guidance for ham radio enthusiasts.
[ Hits: 42 | Votes: 0 | Rating: 0 ]
- RF Impedance Matching Calculator
- Calculates the network to match a line to a specific complex load. This online tool calculates the matching network necessary to terminate a line of the specified characteristic impedence Zo in a specific complex load impedence RL + jXL at a specified frequency.
[ Hits: 192 | Votes: 1 | Rating: 10 ]
- Online Toroid Multi Calculator
- This website provide online calculator for several values about a large variety of toroids. Freq/L/C/Z/Turns Calculator, Impedance Matching Network Calculator
[ Hits: 210 | Votes: 3 | Rating: 5 ]
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