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| Categories List all new links ANTENNAS ARES Procedures ARES/RACES Groups ARRL Be Prepared- Earthquake Be Prepared- Fire Be Prepared- Flood Callout Equipment CW Disaster Preparedness Disaster Relief Emergency Communications Emergency Equipment Emergency Information Emergency Preparedness FCC First Aid General Information Ham Radio Hardware Nets NTS radiograms Radio Clubs SKYWARN Training Weather Information Yolo County
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| 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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