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CSS-905A Airborne Transmitter

CSS-905A can be factory set or user configured over a range of operating parameters, including radio frequency (RF) output power, frequency selection, input data rates, and Advanced Range Telemetry (ARTM) Tier 0, I and II modulation. Its flight history reduces selection and system design risks and provides opportunities for qualification-by-similarity (QBS) analysis. CSS-905A is a proven, high-reliability telemetry transmitter that has supported a full range of qualification testing by the most demanding programs.


Multimode ARTM Tier 0, I and II modulation (PCM/FM, SOQPSK-TG and Multi-h CPM)
Input data rates configurable from 500 kbps to 27 Mbps

Frequency selection from 2200 MHz to 2400 MHz in 0.5 MHz steps

RF output configuration settings of 2, 5, 7 and 10 W
RF enable/disable control pin
IRIG-106-Appendix-N-compliant RS-232 serial control and status interface
+21 VDC to +36 VDC power input range and reverse power protection to -40 VDC
-40 C to +85 C qualified operating temperature range
100 Gs shock and acceleration, 28 Grms vibration
IRIG and MIL-STD-461 EMI compliant, with RF output filtering to protect co-located GPS and FTR subsystems
High-efficiency power design and power amplifier
User configurable or factory set
RF output protection from VSWR loads, including open and short conditions
Mission heritage



Frequency range

2200 to 2400 MHz, 0.5 MHz steps

Output power

2 W, 5 W, 7 W or 10 W (optional switchable power levels)


ARTM 0, I and II (PCM/FM, SOQPSK, Multi-h CPM)

Carrier stability

+/- 0.002%

Output load VSWR

50 ohms (nominal), no damage open or short



RS-422 input

100 ohms differential impedance



Input VDC range

+28 (typ), +21 to +36


Current (typ.)

< 750 mA at 28 V, 5W RF (across temp.); 1.3A at 28V,

10W RF (ambient)

Reverse polarity protection

No damage -40 VDC applied, indefinite period


Power and RF output, common to chassis


Operating temperature

-40 C to +85 C maximum

Storage temperature

-54 C to +95 C

Random vibration

28 G rms maximum


100 G peak ½ sine, 0.5 mSec maximum


100 G maximum


MIL-STD-810 Method 507

Electromagnetic Interference (EMI)

IRIG and MIL-STD-461



3.0” L x 2.0” W x 0.8” H (7.62 cm L x 5.08 cm W x 2.0 cm H)


4.8 cubic inch (12.19 cubic cm)


5.8 ounces (164.4 g)


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