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Half-Length Dipoles for 40 Meters - Complete collection of the four main parts of this excellet research on modelling and designing half wave dipole antennas for 40 meters band, covering all aspects beginning from full wave length antennas, to shortened, loaded and reshaped dipoles
[ Hits: 382 | Votes: 2 | Rating: 10 ]

A Field Guide to Simple HF Dipoles - A scanned PDF of this interesting book on HF Dipole antennas published by Stanford Research Institute
[ Hits: 1284 | Votes: 1 | Rating: 8 ]

NVIS on Google Groups - Search for NVIS on google groups
[ Hits: 1308 | Votes: 2 | Rating: 7.5 ]

Zone Check Interactive Map - Show CQ and ITU Zone in an interactive clickable map based on google maps. Additional locator tool tip can be displayed by clicking on points, and a search function it is also available to locate addresses, and locators.
[ Hits: 187 | Votes: 1 | Rating: 10 ]

Repeaters database on Google Maps - Interesting google map and repeater database integration that let you search, display and also edit repeaters and relative coverage using google maps api by K5EHX
[ Hits: 2712 | Votes: 11 | Rating: 6.92 ]

40 MHz 8m Band Amateur Radio Exploration - The 8m ISM band, a unique frequency range between 10m and 6m, holds potential for amateur radio enthusiasts, yet it remains largely unallocated. This spectrum offers fertile ground for research and self-training. The author's experience with low-power transmissions and WSPR testing highlights the band's capabilities and the need for a narrow, speech-free amateur allocation to encourage experimentation. Discover the world of 8m ISM radio exploration and its future possibilities.
[ Hits: 74 | Votes: 1 | Rating: 8 ]

Thunderstorm connected with Sporadic E propagation - Recent researches seem to support the hypothesis that Sporadic E propagation could be connected to presence of thunderstorms.
[ Hits: 145 | Votes: 0 | Rating: 0 ]

N1KDO's LoTW Look - This application allows Ham Radio Operator to browse and search his LoTW QSL confirmations on his handheld device, and receive notifications when new QSL confirmations appear on Logbook of the World.
[ Hits: 559 | Votes: 2 | Rating: 10 ]

MBU cluster - Simple DX Cluster - MBU Cluster is simple android application for ham radio operators to view live the spots on mobile device. All the spots are refreshing every 60 seconds.
[ Hits: 564 | Votes: 2 | Rating: 9 ]

Kenwood Microphone MC60A Modification - The Kenwood MC60A with preamp, suffers from RF feedback, a search on the web reveals the extent of the problem. This document explain how to fix this problem.
[ Hits: 394 | Votes: 0 | Rating: 0 ]

Prevention and Suppression of RF Interference to Audio Systems - In this study, the author builds upon Muncy's research, demonstrating that radio-frequency current on cable shields affects audio systems through the "pin 1 problem" and shield-current-induced noise (SCIN). An enhanced equivalent circuit for ferrite chokes is proposed, addressing dimensional resonance and inductor self-resonance. Field tests confirm that chokes reduce interference across 500 kHz to 1,000 MHz. Guidelines for diagnosing and mitigating EMI from various sources are provided for product development and field installations.
[ Hits: 47 | Votes: 0 | Rating: 0 ]