arrl handbook
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Antennas : 20M : 20 meter Yagi antennas
- PV4 4 element Yagi antenna
- PV4, W2PV 4 element Yagi antenna as described in ARRL antenna handbook 15th edition for 20 meters band by T93M
[ Hits: 7537 | Votes: 7 | Rating: 6.43 ]
- 2 Meter 10 Element Quagi Antenna
- This antenna was designed by N6JSX Kuby for Transmitter hiding. Fitting the requirements of directionality, high gain, and portability. This antenna was derived from the ARRL Handbook information on Quagi's and Yagi's; in the absence of two meter Quagi information, UHF Quagi dimensions were scaled into 146 MHz use.
[ Hits: 15656 | Votes: 32 | Rating: 7.06 ]
- ZR6KMD 2M Beam Antenna
- This design was adapted from an article in the ARRL Handbook and built with simplicity and
duplicity in mind. This antenna is a vast improvement over a standard dipole with a forward gain of around 8db with a front to back ratio of 10db.
[ Hits: 2222 | Votes: 1 | Rating: 2 ]
- A 6m portable 4 element quad
- This antenna is based on a design for a portable 2 element 6m Quad by VE7CA, which is featured in the 19th Edition of the ARRL Antenna Handbook
[ Hits: 6618 | Votes: 21 | Rating: 8.35 ]
- Log-Periodic Dipole Array Calculator
- This LPDA calculator is based on the design procedure as described by L. B. Cebik, W4RNL (SK) in the 21st edition of The ARRL Antenna Handbook.
[ Hits: 483 | Votes: 5 | Rating: 7 ]
- Propagation on 630 Meters and 2200 Meters
- This is a theoretical look at propagation on 630-Meters and 2200-Meters using ray tracing software. It expands on the brief discussion in the ARRL Handbooks.
The Earth's magnetic field affects 630-Meter and 2200-Meter band propagation. Lower ionization reduces absorption, aiding low-frequency propagation. Differences exist between bands, limited daytime sky-wave propagation. Sunrise/sunset show promise, yet mechanisms are unclear. Ducting possible at night in specific conditions. Negative ions enhance propagation. Inefficient antennas and high man-made noise are anticipated. Groundwave propagation is significant on 2200-Meters.
[ Hits: 38 | Votes: 1 | Rating: 10 ]
- RS232 Interface
- This simple circuit is intended for older Kenwood radios and was presented in chapter 22 of the ARRL Handbook.
[ Hits: 2288 | Votes: 3 | Rating: 7 ]
- RF Radiation and Electromagnetic Field Safety
- Preprinted from the 1997 ARRL Handbook for Radio Amateurs. Thermal Effects of RF Energy, Safe Exposure Levels, Cardiac Pacemakers and RF Safety, Determining RF Power Density
[ Hits: 329 | Votes: 0 | Rating: 0 ]
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