Type 12-146
P-I-N Diode Tuned VHF Antenna
30 MHz - 88 MHz
12-146-DS Issue 1
400 mm max
The most important thing we build is trust
301 mm max
The antenna is a P-I-N diode tuned structure. An internal radiating
element provides a capacitance, which is tuned by an arrangement of
essentially binarily related switched inductive elements.
63.5 mm
The 12-146 is a frequency agile antenna operating over the frequency
band 30 MHz to 88 MHz.
44.45 mm
139.2 mm ref
34.92 mm
52.5 mm max
J2
J1
54 mm ref
162.56 mm
The 12-146 comprises a blade of aerofoil section. The electronic and RF
circuitry is mounted on a circuit board housed within the blade, which is
enclosed at the base by an aluminium alloy baseplate. The baseplate also
supports the RF and DC connectors.
Draining holes are included to prevent the retention of moisture.
91.5 mm max
Chelton Ltd trading as Cobham Antenna Systems
www.cobham.com/antennasystems
Type 12-146
P-I-N Diode Tuned VHF Antenna
Electrical Specification
Environmental Specification
Frequency
30 MHz - 88 MHz
VSWR
≤ 3.0:1
High
Temperature
MIL-STD-810E, Method 501.3, Procedures I and II
Operational: +85°C
Storage:
+85°C
Gain
≥ -6 dBi
≥ 0 dBi
Low
Temperature
Radiation Pattern
Essentially omnidirectional in azimuth
MIL-STD-810E, Method 502.3, Procedures I and II
Operational: -40°C
Storage:
-55°C
Polarisation
Predominantly vertical when mounted vertically
Altitude
Power Rating
25 W cw (maximum)
MIL-STD-810E, Method 500.3, Procedure I
Operational: 7620 m
Storage:
10668 m
Impedance
50 ohm (nominal)
Acceleration
MIL-STD-810E, Method 513.4, Procedure I
13.5 g all axes
Connectors
RF: TNC Female
DC: D38999/20WB35PN
Shock
MIL-STD-810E, Method 516.2, Procedures I and V
Functional: 20 g, 11 ms, sawtooth
Crash Hazard: 40 g, 11 ms, sawtooth
Vibration
Mechanical Specification
MIL-STD-810E, Method 514.4, Procedure I, Category 6
F1 = 17.0 Hz
A1 = 2.0 g
A2 = 2.5 g
F2 = 34.2 Hz
Dimensions (mm)
400.0 x 301.0 x 91.5 (maximum)
W0 = 0.02 g2/Hz
Weight (kg)
1.95 (maximum)
Temperature Shock
MIL-STD-810E, Method 503.3, Procedure I
Mounting
6 holes fixed location
Rain
MIL-STD-810E, Method 506.3, Procedures I and III
Icing/Freezing Rain
MIL-STD-810E, Method 521.1, Procedure I modified
75 mm ice
Humidity
MIL-STD-810E, Method 507.3, Procedure III
95% relative humidity at 60°C
Salt Fog
MIL-STD-810E, Method 509.3, Procedure I modified
264 hrs exposure with last 24 hrs operational
Magnetic Effect
RTCA DO-160C, Section 15, Class Z
Less than 1° deflection at 300 mm
30 MHz
88 MHz
W1 = 0.002 g2/Hz
For further information please contact:
© 2011 Cobham Antenna Systems
The information contained herein is subject to change without notice and must not be taken as establishing
any commitment binding upon Cobham Antenna Systems. No responsibility can be accepted for any errors
or omissions.
Cobham Antenna Systems
The Cobham Centre
Fourth Avenue, Marlow,
Buckinghamshire, SL7 1TF England
Tel: +44 (0)1628 472072
Fax: +44 (0)1628 482255
Email: antennasystems.marlow.marketing@cobham.com