Combined Sonobuoy AIS & UHF Communication Band Blade Antenna
136 to 175 MHz + 225 to 400 MHz
The 21-50-05-3 is a combined VHF/UHF blade antenna intended for the multiple roles of sonobuoy reception, AIS, sonobuoy command and PLS.
An N-type V/UHF connector is fitted to the aluminum base plate which supports a high strength glass-epoxy radome containing a 3-D wide band radiating element of high efficiency.
A separate external diplexer (part no 21-80-31) is available when it is required to split the VHF and UHF outputs.
Frequency of operation covers full VHF Sonobuoy receive and UHF communications band. The antenna can handle up to 60 Watts of UHF power.
136 MHz to 175 MHz VHF
225 MHz to 400 MHz UHF
VHF 1 dBi average, 0 dBi min
UHF +3 dBi (typical mid band) +2 dBi average over band
≤ 2.5:1 VHF
≤ 2.5:1 UHF
≤ 2:1 291-292 MHz
|Impedance (nominal)||50 Ohms|
|Polarization||Vertical (when mounted vertically)|
|Radiation Pattern||Omni directional in azimuth plane, elevation as plots.|
|Antenna RF Connector||N Female VHF/UHF|
|Antenna Shell Type||Glass loaded epoxy blade on aluminum alloy base|
|Height||9 inches (228mm)|
|Weight||4 lbs max (1.8kg)|
|Fixing Holes||8 holes 0.2 inches dia. nominal|
- Urethane Lusterless Black Standard
- Other finish options are available.
- Please specify finish required when ordering.