Tagged: NVIS

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Keeping an NVIS Antenna Legal on 60 Meters

This article is the seventh in a series on Portable NVIS Communication. This series focuses on short-haul communication during a disaster. What Hath God Wrought? Earlier in this series, I explained why I included...

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Field Results for an AS-2259/GS Antenna

This article is the sixth in a series on Portable NVIS Communication. This series focuses on short-haul communication during a disaster. In this part, I will discuss how the antenna performed when tested on the...

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How to Build an AS-2259/GS Antenna

This article is the fifth in a series on Portable NVIS Communication. This series focuses on short-haul communication during a disaster. In this part, we will build an antenna based on the Army’s AS-2259/GS...

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Selecting Center Frequencies for an NVIS Antenna

This article is the fourth in a series on Portable NVIS Communication.  This series focuses on short-haul communication during a disaster. A Brief Review of NVIS Antennas Near Vertical Incident Skywave, or NVIS, is a...

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How to Calculate the Frequency of Optimum Traffic

This article is the third in a series on Portable NVIS Communication. This series focuses on short-haul communication during a disaster. Introduction Earlier in this series, I introduced the Three Keys to NVIS Communication:...

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Critical Frequency and MUF

This article is the second in a series on Portable NVIS Communication. This series focuses on short-haul communication during a disaster. Introduction There are Three Keys to NVIS Communication: Critical Frequency (foF2) Maximum Usable...

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What is Near Vertical Incident Skywave?

This article is the first in a series on Portable NVIS Communication. This series focuses on short-haul communication during a disaster in the Amateur Radio Service. The Donut Hole Dilemma When stations are less...