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    Ritec - Single Function Instruments


    • BR-640: Manually Controlled Broadband RF Receiver
    • SP-801: Manually Controlled High Power Square Wave Pulser
    • GA-2500: High Power Gated RF Pulse Amplifier
    • GA-5000: High Power RF Pulse Amplifier

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    Manually Controlled Broadband RF Receiver

    The BR-640 is a modestly high gain broadband RF receiver specifically designed for use in ultrasonic systems. It features a bandwidth extending from 100 kHz to 50 MHz with an adjustable gain of -12 to 64 dB. It has a low noise figure with both high and low input impedances plus selectable high and low pass filters for bandwidth control. The BR-640 has fast recovery while still being protected against severe overload, allowing its use in a pulse echo (single transducer) type of operation.


    Manually Controlled High Power Square Wave Pulser

    The SP-801 produces negative high power square pulses with fast rise and fall times with an extremely low output impedance (~ 4 Ohms). The pulse width can be precisely matched (continuously variable) to the half period of the frequency (400 kHz to 20 MHz) of an ultrasonic transducer. This maximizes the energy transfer and signal-to-noise ratio for a given voltage output and is, therefore, significantly more effective than a spike pulser. This is especially true at low frequencies. The output level is adjustable in 2-dB steps, from -400 Volts down to -50 Volts.


    High Power Gated RF Pulse Amplifier

    The GA-2500 is a limited-duty cycle amplifier producing high-power RF tone bursts derived from either a continuous-wave (CW) source or an externally generated low-level (~1 Volt peak-to-peak) tone burst. In addition to the RF input, a coherent gate (positive TTL) is required to turn the amplifier on. The power output is continuously adjustable by a front panel potentiometer. Three versions of the instrument are available with different maximum output levels: 5 KW, 1.5 KW, and 400 W rms power into 50 Ohms during the burst. The frequency span of each amplifier is tailored to meet the user's needs within the range of 40 kHz to 20 MHz.