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Instruments for Industry
903 South Second Street
Ronkonkoma, NY 11779
Phone 631 467-8400
Fax 631 467-8558
Email info@ifi.com
www.ifi.com
IFI TWT (CW) SERIES AMPLIFIERS
The TWT Amplifier (TWTA) monitors and transfers the power supply operating voltages and
currents to a Front Panel Display. This aids the user in troubleshooting in the event of a failure.
The TWTA indicates on the display where the fault has occurred.
Complete TWT Protection
Safety Requirement of IEC-348
VSWR Reflected Power Protection
Cathode (Beam) Overcurrent Protection
Helix Overcurrent Protection
TWT Overtemperature
Air Flow Fault Protection
+/-Grid Undervoltage Protection (if applicable)
Solid State Power Supply for Increased Reliability
Features
Front Panel Controls and Indicators
Power On/Off
Standby/Operate (Standby/RF On) (RF On/Operate)
Local/Remote
Fault Reset
Air-cooled (Integrated Forced Air – self-contained)
Modulation, AM, FM & PULSE
IEEE 488 GPIB Remote Control
RF Door Safety Interlock
Self-diagnostic Circuitry
Filament/Beam Elapsed Time Metering
Front Panel LCD Back-lit Display
Collector Current
Grid Voltage (if applicable)
Collector Voltage
Cathode Voltage
Helix Current
Forward/Reflected Power Indication
Filament Hours
Beam Hours
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IFI SOLID STATE AMPLIFIERS
Wide instantaneous frequency range
Gain control
Backlit LCD display
Total/Operate Elapsed Time Metering
Self-diagnostic circuitry
VSWR protection
Safety Requirement of IEC-348
Unconditionally stable against load mismatches
Forward /Reflected Power Indication
IEEE 488 GPIB Remote Control
RF Door Safety Interlock
Air-cooled (Integrated Forced Air – self-contained)
Open Circuit and Short Circuit Protection
Modulation, AM, FM & PULSE
Front Panel Controls and Indicators
Standby/Operate
Local/Remote
EMI Filter built-in
Amplifiers are supplied with an AC line cord to accommodate the power source; an
operation & maintenance manual; and amplifier performance test data.
The Front Panel is standard for RF Connectors and RF Sample Port. If this is not
convenient, please advise the location at the time of order. We will be happy to serve you.
Thank you!
*GPIB IEEE-488 Remote Control is standard.
If this is not convenient, please review & advise the GPIB option at the time of order. These
other available options are at no charge. Thank you!
a. GPIB IEEE-488 Remote Control
b. GPIB IEEE-488 and RS 232 Remote Control
c. GPIB IEEE-488 and RS 422 Remote Control
d. GPIB IEEE-488 and RS 485 Remote Control
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IFI Model ST81-50 Solid State/TWT (CW) Combination Amplifier Specifications
1-8 GHz (operable down to 0.8 GHz – specify if desired at time of order)
Bnd 1: 1-2 GHz (Solid State)
Frequency Range:
Rated Power: 50 Watts minimum (70W typical)
Gain @ rated power: 47 dB
Prime Power: 100-240 VAC +/-10%, 50/60 Hz, Single Phase*
Input/Output Impedance: 50 ohms (VSWR 2.0:1)
RF Input/Output Connectors: Type N Female
Temperature: 0º to 50º C (40º C @ 10,000 feet)
Non-operating Temp: -20º to 70º C (50,000 feet max)
Humidity: 95% without condensation
Altitude: 10,000 feet
Cooling System: Air cooled, self contained
Modulation: AM/FM/Pulse
Configuration: 19” Rack Mount; 19”W x 25.25”L x 10.5”H
Spurious: -50dBc
**Harmonics (nominal):
Features:
**-20dBc harmonics available with filters at an additional charge. The Filters can be external or band
selectable via switches internal to the amplifier. The control can be via the front panel or over the GPIB
remote bus.
Bnd 2: 2-8 GHz (TWT)
Band 1: 0.8-2.0 GHz, -20 dBc @ linear power (35-40 Watts)
Band 2: 2-3GHz: -3 to –8 dBc @ Rated Power
3-6GHz: -8 to –15 dBc @ Rated Power
6-8GHz: -15 to –25 dBc @ Rated Power
VSWR Protection against an output mismatch
* Alternate Prime Power (specify at time of order)
* GPIB IEEE 488 Remote Control
Forward RF Sample Port on the Front Panel, type N-F
(specify front or rear at time of order)
Internal Pre-amplification to obtain rated output power with an input level of
0dBm or less.
RF Input/Output Connectors on the Front Panel
(Specify front or rear at time of order)
Internal Systems Diagnostics
Elapsed Time Metering in hours
RF Safety Interlock, type BNC
Forward/Reflected Power Indication simultaneously on Front Panel display
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