|
Portable Ground Plane Antenna for
433.97MHz
|
||
 |
||
|
This is an experimental antenna you can build for
limited applications.
The transmitting antenna and receiving antenna are probably the most critical items for optimal performance. A small piece of 1/4 wave (6.75") wire as a transmitting antenna in combination with a high gain yagi receiving antenna will work in a surveillance context with limited range. Best range is obtained by using both high gain transmitting and receiving antennas. Range testing was performed using a 14 element yagi beam for the transmitting antenna and an 8 element yagi beam for the receiving antenna. At an approximate distant of 3/4 mile, excellent picture quality was obtained. Using a 1/4 wave ground plane (shown above) for the transmitting antenna and a 14 element yagi beam for the receiving antenna, excellent picture quality at 1/2 mile was possible. If you plan to use a commerical yagi antenna, be sure to buy an ATV antenna designed to cover 433.97MHz. Note: The VideoLynx 434 may be ordered with a fixed micro antenna for special applications such as model rocketry and radio controlled devices. |
||
| Some sources for 70cm ATV antennas: P.C. Electronics Cubex Quads |
||
