Near Vertical Incidence Sky Wave (NVIS).ppt - N3UJJ

Background • Near Vertical Incidence Sky Wave (NVIS) propagation provides local and regional coverage on the lower HF bands. • NVIS is not new. – German army experimented with NVIS during WW II – US military personnel used NVIS in Vietnam.

  Incidence, Waves, Vertical, Earn, Nvis, Near vertical incidence sky wave

A Portable 75/40* Meter NVIS Antenna - arrl-ohio.org

A Portable 75/40* Meter NVIS Antenna - with 3/2/'09 updates - by David B. Murray, KD1BL Author's Note: This article describes a 75/40 meter NVIS, but one could use the construction techniques to build just a 75

  Nvis

CARA NVIS Article 3 - arrl-ohio.org

Improving the AS-2259 NVIS Antenna By N3AE and N3IDX Most CARA members just finished making NVIS antennas for HF emergency service use on 80 and 40 meters.

  Article, Arca, Nvis, Cara nvis article 3

AAR2EY All Band NVIS Antennae Designs - N2CKH

AAR2EY All Band NVIS Antennae Designs Updated 20 May 2007 Updated 23 February 2006 Updated 9 November 2005 Started 13 February 2004 As user of MF/HF frequencies, a dedicated a Near Vertical Incident Skywave (NVIS)

  Design, Band, Aar2ey all band nvis antennae designs, Aar2ey, Nvis, Antennae

Compact Multi-Band Rotatable Dipole Antenna Array

One of the most effective antennas for NVIS is a dipole that is mounted from 0.1 to 0.25 wavelengths above ground. When a dipole is brought very close two ground, the angle of radiation increases.

  Antenna, Dipoles, Dipole antenna, Nvis

OPERATIONAL CONCEPT AND PROCEDURES FOR …

transformation high frequency (hf) radio system (thfrs) - an/prc-150 family standard operating procedure (sop) and operations concept (oc) for the brigade combat teams

  An prc 150

BARKER & WILLIAMSON BROADBAND FREQ AGILE …

(1) The Barker & Williamson Broadband Folded Dipole Antenna is designed for continuous frequency operation over its specified range . The antenna comes fully assembled and pretuned so no measuring or cutting is required.