Each Comtech EF Data KPA Ku-Band SSPA delivers its rated power, guaranteed, at
the 1 dB compression point, to the transmit waveguide flange. The KPA provides a cost
effective and more reliable replacement for Transfer Wave Tube (TWT) amplifiers in Ku-Band
terminals. Due to its small form factor, it is also ideal for the construction of small
"flyaway" terminals, medium size (equivalent to Intelsat F) earth stations, and hub earth
stations for small to medium size private networks, or point-to-point links.
The Solid-State Advantage
Each KPA series SSPA is constructed with highly reliable Gallium Arsenide Field Effect
Transistors (GaAs FETs). With third order inter-modulation products from 4 to 6 dB better
than TWT ratings, the Comtech EF Data unit replaces TWTs with saturated power levels of
up to twice the KPA's rated output. The KPA SSPSs also provide a Mean Time Between Failure
(MTBF) that is 4 to 5 times greater than the typical TWT MTBFs.
Comtech EF Data's KPA series of SSPAs come equipped with useful features that other
manufacturers offer as options. Included in the base price are temperature compensation,
sample ports, power monitor, rack slides, and full remote monitor and control capabilities.
The SSPA consists of a chassis, power supply, fan
assembly, front panel assembly, Monitor/Control
Processor (MCP), and an SSPA module. The amplifier
was designed using a Comtech EF Data low-loss
combining technique and an MCP-based temperature
versus gain compensation.
Field Replaceable Power Supply
Recognizing that the MTBF limiting factor for almost all electronic equipment is the power supply, the KPA provides for easy field
replacement. Simply disconnect the AC mains, release the clasps, and remove the supply from the SSPA module.
Built-in Redundancy Controller
Each SSPA amplifier has the ability to function as a 1+1
or 1+2 redundancy controller in the backup mode. The
optional redundancy configuration is implemented by
attaching a ganged waveguide/coax transfer switch(es)
to the input and output connectors of the amplifiers with
a combination coaxial cable and waveguide kit. When
the backup SSPA is commanded into the controller
mode, it monitors the online SSPA(s) for faults. A
faulted online unit may be disconnected and replaced
without affecting the online power amplifier.
The remote control interface is selectable between EIA-232 and EIA-485, as well as full Ethernet including Telnet, SNMP and pre-loaded
HTML GUI. All configuration control, status retrieval, and adjustments are available as simple ASCII commands through the serial
interface or through the front panel menu. As a cost option, the remote control command structure can be customized in order to
accommodate existing network control software.
14.0 to 14.5 GHz
Power (minimum at 1 dB compression)
50.0 dB min., 53.0 dB typ.
60.0 dB min., 63.0 dB typ.
61.0 dB min., 64.0 dB typ.
65.0 dB min., 70.0 dB typ.
20 dB in 0.25 dB Steps
Per 40 MHz
+0 to +50°C
±0.50 dB@center freq.
±1.00 dB full band
Third Order Inter-Modulation
+50.5 dBm min, 53.0 typ
+53.5 dBm min, 56.0 typ
-30 dBc typ, -25 dBc max @ 3 dB total backoff
(two tones, f+ 1MHz)
Group Delay (per 40 MHz)
± 0.03 ns/MHz
± 0.003 ns/MHz2
1.0 ns Peak to Peak
10 dB typ., 15 dB max @ max gain
-10 dBm typ.
20 x 2 LCD
Cursor Control Keyboard
Type N, 50, -40 dBc
Type N, 50, -20 dBc
EIA-485 or EIA-232
19W x 4H x 24D inches
(48W x 9H x 60D cm)
19W x 7H x 24D inches
(48W x 18H x 60D cm)
19W x 9H x 24D inches
(48W x 22H x 60D cm)
75 lbs (34 Kg)
32 to 122°F (0 to 50°C)
-40 to 158°F (-40 to 70°C)
(derate 2°C/1000ft AMSL)
10 to 95% Non-condensing Operating
0 50 100% Non-condensing Storage
Normal Commercial Shipping and Handling
90 to 135 or 180 to 270 VAC,
47 to 63 Hz, 400W (Auto-Select)
90 to 135 or 180 to 270 VAC,
47 to 63 Hz, 600W (Auto-Select)
180 to 270 VAC,
47 to 63 Hz, 1100W (Auto-Select)