Atec IFI-PT186-2KW - Manual (Page 3)

August 09 2012
IFI PT Series Amplifiers are pulsed amplifiers that amplify RF signals applied to the RF input. This amplifier has a
Pulse input connector that accepts a TTL pulse level from an external pulse generator or signal source for
modulation of the TWT. The TWT is modulated from the pulse input connector via the internal TWT pulse
modulator. The Modulator is floating at Cathode voltage and switches the TWT on and off at very fast rates. This
method of pulse modulation turns the beam off via the modulator when the pulse input connector is at a TTL low.
This means there will be no noise power being created by the TWT. This is sometimes referred to as blanking in
amplifiers but it is a modulator in TWT amplifiers. The RF rise/fall times are based on the speed that the modulator
switches. Typically the rise/fall times are 10-15 nsecs for PT amps. RF pulse bursts can be applied to the RF input
while the pulse input is modulating the TWT. Various combinations can be applied to fulfill whatever your test
requirement specifies.
Front Panel Back-Lit Display
Collector Current Forward RF Power Indication Reflected RF Power Indication
Cathode Voltage *Duty Cycle/PW and PRF Rate Beam Hours
Collector Voltage Helix Current Filament Hours
GPIB Address Front Panel Settable
The TWT Amplifier monitors and transfers the power supply operating voltages and currents to a LCD multi-
character Front Panel Display. This aids the user in troubleshooting in the event of a failure. This amplifier model
indicates on the display where the fault has occurred.
Maintainability
The IFI Pulse TWT Amplifiers are designed to permit easy field repair of the amplifier. Please note, no RF
components, including the TWT, need to be removed to service the power supply. IFI has also refrained from using
potting compounds as a cure for high voltage arcs. These compounds make repairs very time consuming and
expensive. At an operating facility, repair of the amplifier can typically be completed in less than one hour, thereby
reducing the system downtime.
Additional Features
- Small Lightweight Design
- Air Cooling Self-Contained Fans
-
Modular Design for ease of Maintenance
- 3 minutes of Warm-up Time
* This feature is implemented and available only from IFI. This feature allows the user to view the duty cycle,
pulse width (PW) or pulse repetition frequency (PRF) on the front panel display.
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