The family of the HF mobile antennas AD-4 are composed of the antenna sections and the antenna bases suitable for various configurations and antenna heights. The antennas are intended for mobile work with the HF radios. The antenna sections are all 120 (4’) cm long and are made of strong pultruded composite tube (fiberglass) with male and female joints at both ends. Antenna sections are mounted on the antenna base type AP-4/M (up to 4 sections) or on the base type AD-4/MHD (up to 7 sections), made of composite materials and with biconical SS spring enabling bending the antenna with the rope horizontally for NVIS applications. The antenna sections are packed in canvas bag for transportation and storage.
The antenna AD-4 could be used also stationary with the antenna base type AP-4/S or side feed base type AP-4/SF.
A special antenna base type AP-4/MHL was designed for NVIS applications. The AP-4/MHL has a special locking system enables to lock the spring for rigid position or unlock it in order to tilt the antenna in horizontal position for NVIS applicaitons.
NATO STOCK No. (NSN): 5985-42-000-0720 (Antenna AD-4/4.8m + Base AP-4/MHD)
Technical specification
| Frequency range | 1.5 - 30 MHz |
| Impedance | see PDF |
| Max. power | 400 W - 1 kW CW |
| Polarization | VER. |
| Connector | M 6 screw type |
| Height |
3.6 - 4.8 m (AP-4/M) AP-4/MHL or AP-4/MHD) |
| Wind velocity | 120 km / h |
| Temperature range | -40...+70 °C |
| Section weight | |
|---|---|
| AD - 4/1 | 0,17 kg |
| AD - 4/2 | 0,26 kg |
| AD - 4/3 | 0,40 kg |
| AD - 4/4 | 0,53 kg |
| AD - 4/5 | 0,63 kg |
| Support weight | |
|---|---|
| AP-4/M | 2.5 kg |
| AP-4/S | 2.2 kg |
| AP-4/MHD | 4.3 kg |
| AP-4/MHL | 4.1 kg |
| Total height of sections: | |
|---|---|
| 3.6 m | AD-4/1 + AD-4/2 + AD-4/3 |
| 4.8 m | AD-4/1 + AD-4/2 + AD-4/3 + AD-4/4 |
| 6.0 m | AD-4/1 + AD-4/2 + AD-4/3 + AD-4/4 + AD-4/5 |
| 7.2 m | AD-4/1 + AD-4/2 + AD-4/3 + AD-4/4 + AD-4/5 + AD-4/5 |
| 8.4 m | AD-4/1 + AD-4/2 + AD-4/3 + AD-4/4 + AD-4/5 + AD-4/5 + AD-4/5 |
