Subcutaneous Transmitters: Describes the Stage Four transmitter and receiver, its performance, and specifications.
Recorder Instrument: The LWDAQ Instrument that uploads data from the Data Receiver (A3018).
Neuroarchiver Tool: The LWDAQ Tool that processes and stores Recorder Instrument data.
Data Receiver (A3018): Combination of Demodulating Receiver (A3017), Saw Oscillator (A3016SO), and Data Recorder (A3007C) into one box with BNC connection for an RF Antenna (A3015). Replaces the A3010.
Demodulating Receiver (A3017): Replaces the A3005.
RF Combo (A3016): Combines three circuits in one board: a new RF Spectrometer, a new SAW Oscillator, and a new Demodulating Receiver.
Antenna (A3015): An antenna stand made out of a circuit board and angle brackets that connects via BNC cable to the receiver.
RF Tester (A3014): Test circuits preparing for next receiver design. Includes a SAW Oscillator, a Modulating Transmitter, a Demodulating Receiver, and a TQFP-48 programmer.
Subcutaneous Transmitter (A3013): Transmitter with two inputs and antenna combined with primary input leads.
Encapsulation: Development of a rugged, water-proof encapsulation procedure for small subcutaneous transmitters.
Flexible Wires: Search for flexible, corrosion-resistant leads for subcutaneous transmitters.
Data Transmission and Reception Circuits, Part Two: Describes the Subcutaneous Transmitter (A3009A), Demodulating Receiver (A3005C), Data Recorder (A3007B), and the combination of A3005C with A3007B in a single enclosure which we call the Data Receiver (A3010A).
Demodulating Receiver (A3005C): A 902-928 MHz ISM-band FM receiver.
Programmer (A3011): Programmer and test circuit for A3009 transmitters.
Data Receiver (A3010): Combination of A3005C and A3007B in a single enclosure, with one antenna sticking out. Provides a cable for power and signals.
Subcutaneous Transmitter (A3009): Transmitter with programmable center frequency and modulation width. Programming connector eliminates programming extension board used with previous circuits.
RF Spectrometer (A3008): Measures RF power from 850 MHz to 1050 MHz. Used to measure interference power in London and Boston.
Data Transmission and Reception Circuits, Part One: Describes the failure of the Subcutaneous Transmitter (A3006A) with Demodulating Receiver (A3005A) and Data Recorder (A3007A).
Data Recorder (A3007): Takes output of A3005A as its input, detects A3006 transmissions, and stores them in its 512-KByte memory along with time stamps. For use with the Recorder instrument.
Subcutaneous Transmitter (A3006): Battery, 950-MHz oscillator, magnetic power switch, 32-kHz oscillator, programmable logic chip, sixteen-bit analog-to-digital converter, x10 differential input amplifier, 160-Hz low-pass filter, 1.6-Hz high-pass filter.
Dummy Transmission Circuits: Performance of the Transmitter with Logic Chip (A3004) together in combination with the Demodulating Receiver (A3005), showing that the two circuits meet or exceed our expectations.
Receiver (A3005): 50-Ohm antenna input, SAW (surface acoustic wave) filter, 1000-MHz local oscillator, 95-MHz intermediate frequency low-pass filter, 60-db limiting amplifier, full-wave rectifying demodulator, 20-MBPS 1-V logic output for oscilloscope viewing.
Transmitter with Logic Chip (A3004): Battery, 950-MHz oscillator, magnetic power switch, 32-kHz oscillator, and programmable logic chip.
Transmitter with On-Off Switch (A3002): Battery, 950-MHz oscillator, and magnetic power switch.
Technical Proposal: Proposal to develop and build subcutaneous transmitters, addressed to Dr. Walker of the Institute of Neurology, London.
Test Circuits (A3001): User manual for feasability test circuits.
Modulating Transmitter: Feasability study using our Modulating Transmitter test circuit.
Downshifting Receiver: Feasability study using our Downshifting Receiver test circuit.
Miniature Transmitter: Feasability study using our Miniature Transmitter test circuit.