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Records 1 to 10 of 13

Date Category Description
 1/16/2004 ANTENNAS Tape Measure Antenna
Designed for use when portability and operation on different frequencies are primary the considerations. The antenna is housed in a molded plastic housing holding two stainless steel tapes calibrated in meters, decimeters and centimeters. These tapes can be extended to the required length for a given frequency and locked in place. A permanent frequency-to-meters conversion chart is attached to the antenna housing. Each end of the tape is attached to a length of nylon line which acts as an insulator and a means for securing the antenna to structures of suitable height.
 1/15/2004 ANTENNAS North America NVIS
North America NVIS Optimum Frequencies
 1/15/2004 ANTENNAS Near-Real-Time F2-Layer Critical Frequency Map
Useful information for choosing appropriate band for NVIS antennas.
 1/12/2004 ANTENNAS NVIS relative gain table
Summary of relative gain toward the zenith for field-expedient high frequency atennas (in dB).
 1/12/2004 ANTENNAS NEAR-VERTICAL SKY-WAVE CONCEPT
NEAR-VERTICAL INCIDENCE SKY-WAVE PROPAGATION CONCEPT
 1/9/2004 ANTENNAS An Elaborate inverted V for NVIS?
low_loss_inverted_v.jpg (JPEG Image, 507x760 pixels)
 1/9/2004 ANTENNAS NVIS PowerPoint Presentation from Comm Academy 2003
NVIS PowerPoint Presentation from Comm Academy 2003
 1/9/2004 ANTENNAS Near Vertical Incident Scattering Antenna
Near Vertical Incident Scattering Antenna
 12/28/2003 ANTENNAS
Emergency Communications
Near Vertical Incidence Skywave HF radio wave techniques
NVIS Near Vertical Incidence Skywave HF radio wave techniques. Perfect for emergencies or to transmit and receive out to a 200 mile radius without a dead skip zone. A hilltop location or beam type antenna is not required. Vehicular operation is possible. We also dicsuss using low profile, invisible antennas and covert communication techniques.
 12/23/2003 ANTENNAS AS/2259/GR Antenna
AS-2259/GR HF Portable Antenna
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