C-Band VSAT Transmit ODU
DESCRIPTION
These ODUs are Celeritek’s standard 2 watt transmitters
for the C-band VSAT frequency range. The transmitters come
in a ODU (out door unit) assembly of minimum size for
customers designing their own satellite transceivers. They
convert a 950-1450 MHz IF input signal into a C-band output
signal via a waveguide interface.
These model’s output power offer a minimum of 33
dBm (@ 1dB gain compression point) under all input
electrical and environmental conditions. At the normal
operating output power of 31.5 dBm, the spectral regrowth is
better than -26 dBc. The device draws a maximum DC current
of 2.4 amps(2.0 amps Typ.) at +13 volts at the input of the F-
connector.
The ODU includes a complete printed circuit assembly
(PCA) containing a four-function assembly comprised of: 1.)
triplexer - LO/Ref., IF & DC separation; 2.) IF signal
amplification and gain temperature compensation; 3.) LO/Ref.
signal amplification and; 4.) High efficiency DC to DC
converter.
The unobtrusive module is weather-sealed, weighs only
3.8 pounds and is designed to mount directly to the feed
assembly – without additional bracketing or supports.
FEATURES
❏Designed for Broadband Data/IP
and Telephony
❏World’s Smallest ODU
• 12.25” (l) x 4.0” (w) x 3.25” (h), 3.8 lbs.
• Highly Efficient Thermal Transfer
❏Operating Frequencies
• 5.925 to 6.425 GHz (STD C-Band)
• 5.850 to 6.350 GHz (Brazilian C-Band)
• 6.725 to 7.025 GHz (INSAT C-Band)
❏Transmit Power 3.5W Typ. P1dB
• 4.0W Typ. Psat
• 2.0W Min. P1dB Over Temp.
❏Low-Cost Transmitter Approach
• ODU Accepts 950-1450 MHz IF Signal
• Single Cable Interface for LO, IF and DC
• LO Input Options:
• 1843.75 MHz (STD C-Band)
• 1825.00 MHz (Brazilian C-Band)
• 1993.75 MHz (INSAT C-Band)
• 10 MHz Ref. (Integral PLO)
• High Efficiency DC/DC Converter
• Protection Against Lightning and ESD
❏Highly Reliable Design
• Moisture Sealed Thin-Film MW Module
• 300,000 hr Demonstrated MTBF
Model Configuration
CTR-642533-1 STD C-band, LO: 1843.75 MHz
CTR-642533-2 STD C-band, Ref: 10 MHz
CTR-635033-1 Brazilian C-band, LO: 1825.00 MHz
CTR-635033-2 Brazilian C-band, Ref: 10 MHz
CTR-702533-1 INSAT C-band, LO: 1993.75 MHz
CTR-702533-2 INSAT C-band, Ref: 10 MHz
EXPERIENCE AND CAPABILITIES
As one of the world’s largest suppliers of VSAT
transmit ODUs, Celeritek can offer the lowest prices using
our high-volume production line to achieve efficiencies not
possible with smaller production lines.
The company’s in-house GaAs FET and MMIC
capabilities, along with extensive amplifier products, provide
the basis for Celeritek to offer these high-performance
products at competitive prices. Also, the company uses a
combination of thin-film and softboard techniques to reduce
manufacturing costs and maintain high reliability.
Celeritek’s dedicated production line and engineering
team for communication products is highly experienced in the
development and production of high-reliability, low-cost
VSAT products.
PRELIMINARY
Model CTR-642533
Model CTR-635033
Model CTR-702533
C-Band VSAT Transmit ODU PRELIMINARY
3236 Scott Boulevard
Santa Clara, California 95054
(408) 986-5060 Fax: (408) 986-5095
Web: www.celeritek.com 10/98
SPECIFICATIONS
Parameter Specification Conditions
Frequency Range, GHz C-Band —
Output Power, dBm (Min) 33 (+35 Typ @ 25°C) P1dB, -40°C to +55°C
36 (Typ) Psat
Gain, dB (Typical) 46–50 (@ +25°C) In Band
45–51 (-40°C – +55°C) —
Gain Flatness, dB (Max) ±2.0 (Full Bandwidth) -40°C to +55°C
±0.75 (54 MHz Bandwidth) -40°C to +55°C
Gain vs Temperature, dB (Max) 2.0 Over any 40°C range
3.0 -40°C to +55°C
Frequency Sense Inverted High Side LO
Spurious Output < -40 dBc/4 kHz 5.7–6.575 GHz and 6.725–7.025 GHz
< -120 dBm/4 kHz (Noise) Rx Band
< -90 dBm (Spurious) Rx Band
< -20 dBm/4 kHz All Other
Phase Noise Addition, dB LO input phase noise +13 External LO Input
IF Frequency, MHz 950–1450 Final LO is High Side
LO Frequency Input Options, MHz A/R LO Input -15 to +5 dBm
10 (Integral PLO) LO Input -5 to +5 dBm
Operating Temperature -40°C to +55°C —
Transmit Duty Cycle 0 – 100% —
Power Consumption, Watts 31 (Max.) / 26 (Typ.) +13 to +24 Volts Input
Connectors/Interface In: Type F, female O-Ring sealed —
Out: WR-137 Waveguide —
Size, Inches 12.25 (l) x 4.0 (w) x 3.25 (h) —
Weight, lbs. 3.8 —
MTBF, Hrs. 300,000 @+25°C
Environmental Screening Temperature Cycle (10) & 48 Hr Burn-In 100%
Paint White, Environmentally Qualified Epoxy Prime Coat/Polyurethane Top Coat
+9 VDC
-Vg
IF
BPF BPF
CABLE
INPUT TRANSMIT
OUTPUT
DC
CHOKE
REF
BPF
DC/DC
CONVERTER
LPF
X4
MULTIPLIER
U
U
OPTIONAL PHASE
LOCKED OSCILLATOR
WITH 10 MHz REFERENCE
Transmitter Block Diagram
TEMPERATURE GAIN
COMPENSATION
PHASE NOISE (dBc/Hz)
WITH INTEGRAL PLO
-70 @ 100 Hz
-80 @ 1 kHz
-88 @ 10 kHz
-105 @ 100 kHz
