The antenna AD-18/D-3512-DF-A is a wideband monopole VHF/UHF mobile antenna for frequency range from 30 to 512 MHz with the antenna diplexer built inside the antenna housing, enables connection of the two separate VHF and UHF radio units on the same antenna. The antenna is composed of two main parts: antenna base and radiator. The antenna base is made of aluminum and durable plastic materials. Inside the base is the matching circuitry for the VHF/UHF antenna radiator together with the VHF/UHF diplexer which enables a separate feed for VHF and UHF signals. Stainless steel spring above the housing absorbs the shocks and the vibrations, in addition protects the antenna against impacts. Two sections antenna radiator are made of brass tubing enclosed in strong and durable fiberglass radome tube. The antenna base has four mounting holes equally spaced on a 4.5" (114.3 mm) circle which complies with NATO standard. The antenna radiator is painted MIL Green while the antenna base with the spring is black colour.
Technical specification
|
Electrical specifications VHF/UHF |
|
|---|---|
| Frequency range |
30 - 88 MHz (VHF); 225 - 512 MHz (UHF) |
| Impedance | 50 ohm |
| VSWR | < 3.5 |
| Gain |
typ. -6 ... +3 dB (1/4 wave) (see diagram) |
| Port to port isolation | < 40 dB |
| Polarization | VERT. |
| Max. power | 75 W CW avg.; 100 W max. |
| Connector |
BNC female (VHF), N female (UHF) |
| Mechanical specifications | |
|---|---|
| Height | 2.77 m |
| Weight | ~ 4.8 kg |
| Max. high voltage rating | 16 kV |
| Temp. range - in use | -50 ... +55 °C |
| Temp. range - in stock | -55 ... +75 °C |
| Wind velocity | 160 km/h |
| Color | MIL Green, Black |
