National Aeronautics and Space Administration, Goddard Space Flight Center, Wallops Flight Facility, Wallops Island, VA 23337

58 -- SUBCARRIER DEMODULATOR SOL 822-37050-0000/712 DUE 090195 POC Billie R. Blackwell, 804/824-1431/Contracting Officer, Darlene B. Floyd, 804/824-1410. Subcarrier Binary Phase Shift Key (BPSK) Demodulator--2 each. Shall meet the following specifications: All parameters shall be totally controllable, configurable, and monitorable both locally and remotely via an RS-232 interface. Subcarrier frequency, data bandwidth, loop bandwidth, and input source selection shall be selectable via thumbwheel switches on the front panel. BPSK subcarrier phase error, phase lock, and voltage control oscillator (VCO) frequency deviation shall be monitorable via front panel meters and remotely via an RS-232 interface. Test points shall be provided for monitoring composite input signals, regenerated BPSK carrier, demodulated baseband outputs, and dynamic phase error voltage. No internal adjustments shall be required to meet the performance specifications over the full range of operation. Subcarrier Frequency: The subcarrier frequency shall be selectable by both thumbwheel switches on the front panel and remotely via the RS-232 interface and shall range from 500 Hz to 4MHz in 10Hz increments. Data Bandwidth: The data bandwidth shall range from 100Hz to 4MHz in 100Hz increments and shall be selected by both front panel thumbwheel switches and remotely via the RS-232 interface. Loop Bandwidth: The loop bandwidth shall range from 1Hz to 10 KHz in 1Hz increments and shall be selected via both front panel thumbwheel switches and remotely via the RS-232 interface. Carrier to Bandwidth Ratio: The carrier to bandwidth ratio shall not exceed 1,000. Input Impedance: The input impedance shall be 50 ohms or greater than 20,000 ohms (two separate inputs). Input Selection: The input source (minimum of two, each with high and low impedances) shall be selectable by both front panel thumbwheel switch and remotely via the RS-232 interface. Input Level: The level of input signal shall be a 0.1 to 10 volts peak-to-peak signal plus noise. D.C. Offset: The input D.C. offset shall be up to 30 volts D.C. combined offset including signal peaks. This will not cause any degradation in the demodulator performance. Carrier Tracking Range: The carrier tracking range shall be plus or minus 2 times the selected loop bandwidth. Signal-to-Noise Performance: The signal-to-noise ratio necessary to maintain demodulator lock is 6dB (as measured at the noise reference bandwidth at the information rate). Modulation: The modulation type shall be BPSK with suppressed carrier. Dynamic Phase Error Output: The dynamic phase error output shall range from 0 to 0.5 volts peak-to-peak and shall be monitorable by a front panel meter. Outputs: Demodulator Output #1--1 volt peak-to-peak, into 50 ohms; Demodulator Output #2--1 volt peak-to-peak, into 50 ohms; Subcarrier Monitor-- 0.5 volts peak-to-peak; Lock--(in) nominal +5 volts Transistor Transistor Logic (TTL), (out) nominal 0 volts TTL. Input/Output Connectors: The input and output connectors shall be BNC female. Electrical Characteristics: Voltage--105-125 VAC, 50-60 Hz, single-phase; Current--1.5 amps maximum; Power--150 watts. Environmental (Operating) Specifications: Temperature-- 0 degrees to 60 degrees C; Relative Humidity--up to 95% without condensation. Mechanical: Units maximum size cannot exceed 5.25'' vertical rack height; Unit must be in a standard EIA-19'' rack mountable case. This synopsis is being issued to solicit quotations from vendors desiring to furnish the above described item to the Government at the address set forth below. Written quotation in response to this Request for Quotation (RFQ) should be submitted to the attention of the individual(s) set forth above no later than 4:30 p.m. Eastern on Sept. 1, 1995. No separate Request for Quotation will be issued. FOB destination pricing is requested. Delivery to NASA, Goddard Space Flight Center, Wallops Flight Facility, Wallops Island, VA 23337. Delivery is required 150 days after award of purchase order. Award is anticipated to be made within 7 calendar days after the closing date of the RFQ and will be made to the responsible firm submitting the lowest reponsive quote. Quotations may be submitted by Fax to (804)-824-1974. All quotes received from Small Business Concerns will be considered. The Standard Industrial Classification Code for this requirement is 3669/750 employees. Companies are requested to submit a small business certification with their quotation. See Note(s): 1. Collect calls not accepted. (0216)

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