Tentative batch of 30nos of ST940B antenna system
is released. System is developed by request of UN.
Please address all comments to
george@stealth.ae
(Stealth Telecom Ltd.)
installed...
RMR assy...
antenna tuning units...
antenna remote control unit
main unit
stealth flyer
Specifications
General Specifications
ST-940B
Frequency Range 2.7 ? 15.0 MHz, ±2%
Power Rating 125 W PEP
Input Impedance 50 ohms
VSWR Not greater than 1.3:1
Pattern Radiation
Omni directional, HRP offsets are less than 1 dB
at two opposite minimas,
Vertical Elevation
? NVIS lobe @
70-90º
Bandwidth
(Measured
at VSWR 2:1) 20 kHz at 3.0 MHz Carrier
260 kHz
at 15.0 MHz Carrier
Gain
(compared to ideal
1/4? GP*) -0.32dB @ 15 MHz; -1.27dB @ 7 MHz;
-2.17dB @ 3.5 MHz;
Power Supply Voltage 12-14VDC/
4 A (peak current)
Tuning Method Continuously
Variable Tuning
Tuning Time 3 seconds average,
8 seconds max.
Tuning Accuracy ± 1.8º step or
:
Approx. ±200 Hz at 3.0 MHz
Approx. ±15
kHz at 15 MHz
Tune Signal 4-30 W PEP CW followed
by logic
consequence via 4 I/O programmable
interface
Tuned Point Instability
Wind/Vibration
Not detected at speeds up to 150 km/h
asphalt
and up to 90 km/h off-road
Tuned Point Thermal
Instability
(within 3 min under 100 W PEP CW)
Less than 500Hz negative
drift @ frequencies
below 4 MHz
Less than 10Hz negative drift @
frequencies above 4 MHz
Feeding method Shunt
fed, ?-match in series with
preset reactance
System Serial Bus RS-485, differential
Programming
Port RS-232
Dimensions H x W x L,
(without
mounting brackets) Folded Up: 740** x 1254 x 1852
mm
Folded Down: 175 x 1254 x 1852 mm
Weight
(without mounting brackets) 36 kg
Sealing Withstands
rain testing per MIL STD 810 C/D/E
Shock/Vibration
Protection provided via Impact
resistant vibroframe
Dust and Humidity Protection provided via environmental
resistant housing to MIL STD 810
C/D/E and
connections to MIL C26482.
* If compared with
mobile loaded whips approx. 0.6 dB to be added at
all three frequencies.
NOTES:
Data is specified
for +25Cº unless otherwise stated. All specifications
listed are typical.
Specifications are subject
to change without notice and are issued for guidance
purpose only.