Naval Research Laboratory, Attn: Code 3240, 4555 Overlook Ave., S.W. Washington, DC 20375-5326

A -- RESEARCH AND DEVELOPMENT SOURCES SOUGHT-94 GHZ RADAR TRANSMISSION LINE AND ROTARY JOINT POC James P. Waldenfels (202) 767-3003, Code 3240.JW Contracting Officer F. Janilea Bays, (202) 767-2974 E-MAIL: Click here to forward a request via e-mail, Synopsis@Contracts.nrl.navy.mil. Sources are sought by NRL's radar division which is currently developing a (nominal) 94 GHz. high power radar. The path from the transmitter to the antenna is about 15 feet, requires several bends and two rotary joints. Losses and break-down voltage preclude the use of WR10 wave-guide. Power levels to the antenna could reach 80,000 watts peak @ 15% duty cycle. We are looking for vendors capable of supplying all or part of the transmission line and rotary joint. The preliminary specification follows for the W-Band transmission line and Rotary joint. SEND REQUESTS FOR CITED DRAWINGS BY E-MAIL TO CROGHAN@CONTRACTS.NRL.NAVY.MIL OR BY FAX TO JANET CROGHAN (202) 767-5896 or 6197, include complete mailing address and telephone number. This specification describes the transmission line and rotary joints necessary for NRL's 94 GHz radar system. The antenna pedestal (surplus AN/TPQ-27) will be mounted on top of an 8 by 40 foot radar van. The transmission line and rotary joint will be exposed to the elements, therefore require protection. See figure #1. The transmission line must be compatible with a WR-10 wave-guide output from a TWT at 5 KW peak and a TE01 output from a Gyro-Klystron, 1.28 inches in diameter at 80 KW peak, either amplifiers will be mounted directly under the antenna pedestal. The output of the transmission line will connect to a quasi-optical duplexer located behind the antenna. This will require a corrugated feed horn to launch the quasi-optical beam. See figure #2. Two rotary joints will be required, one for azimuth rotation and one for elevation rotation. The mounting space for both rotary joints is limited. There is a 6.7 inch diameter space inside both azimuth and elevation encoders where the rotary joints will be mounted. See figure #2 and #3. Mechanical: 1. The diameter of the transmission must be less than 3 inches. 2. The transmission line path through the pedestal will require as a minimum four 90 degree bends. 3. Pressure 5 pounds per square inch. max. 4. Rotation speed: 15 RPM. 5. Operational temperature -10 to 110 degrees Fahrenheit. Electrical: 1. Center frequency: 94.0 Ghz. 2. Power: 80,000 watts peak 12,000 watts average. 3. Bandwidth: 4 Ghz. 4. Insertion loss from end to end including two rotary joints and adapters will be less than 0.5 db. 5. Insertion loss change due to rotation less than 0.1 db. 6. VSWR: 1.2 to 1 (input and output) 7. VSWR: change due to rotation less than 0.1 to 1 8. Phase linearity: +/- 5 degrees. 9. Phase change over 5 degrees of rotation will be less than +/- 5 degrees. 10. Mode purity will exceed 99% at the output. 11. Mode purity of the preferred polarization will be better than 99%, cross polarization will be greater than 30 db below the preferred polarization. 12. Mode purity test data and procedures will be provided. Figure #1 is an overall view of the radar system. The transmitter will be directly under the radar pedestal with access through the roof of the van. The distance from the Gyro-Klystron output to the base of the pedestal where the azimuth rotary joint will be is approximately 5.3 feet. Figure #2 shows the radar pedestal with dotted lines marking the transmission line path. The azimuth and elevation rotary joints will be mounted in the encoder housing. Figure #3 is an azimuth base view showing the azimuth encoder and space allowed for the rotary joint and transmission line. Figure #4 is an elevation base view showing the elevation encoder and space allowed for the rotary joint and transmission line. This is not a request for proposals. Send statements of capabilities by October 3, 1997 to James P. Waldenfels by mail to the above address, by FAX (202) 767-5896 or -- 6197, or by E-MAIL to waldenfels@contracts. nrl.navy.mil).***** (0265)

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