Model 8942-800 - Dual frequency (1200 & 3100 MHz) feed with coincident phase centers
A dual frequency (1200 & 3100 MHz) feed with coincident phase centers; 30 dB maximum cross-polarization and antenna sidelobes better than 22 dB down. The structure is optimized for minimum primary pattern interaction and best isolation. Polarization and frequency band switching was provided with a remotely-actuated coaxial switch.  The delivered antenna is being used as part of antenna range instrumentation for testing modern radars.

Model 8365-800 - UHF Feed for Existing Reflector
Requirements specified that the antenna would be an existing 5-meter diameter reflector and that the feed should have vertical polarization in the 200 - 300 MHz band and horizontal polarization in the 300 - 400 MHz band. The design also allowed the feed to mount easily to the vertex of the reflector.A set of broadband dipoles was attached to a metal support spar. Tuned reflecting elements optimized the primary patterns. Coaxial cables were led from each dipole feed point to the base of the spar support, where a coaxial switch was installed for bandswitching. The completed feed was tested in the 5-meter reflector. 

Model 9221-800 - Low Axial Ratio C-band Scalar Feed
Remotely switches between right-hand and left-hand circular polarization. Operating over the 3.4 - 4.2 GHz frequency range, axial ratio is less than 1.0 dB over the 1 dB beamwidth. A low-loss waveguide transfer switch with remote status indicators selects the RF port. Special waveguide runs are provided to interface with existing equipment. The feed weighs 22 pounds and is used on a 12-meter reflector.

Model 9822-800 - Special Corrugated Horn for Offset Reflector.
16.9 - 17.1 GHz, linear polarized with end-launch SMA jack.

Model 9836-800 - Special Prime-Focus Dual-band Feed for 60-foot Reflector
The 225 - 400 MHz low band is dual circular polarized and is rated at 2KWCW. The 1.2 - 1.6 GHz high band is circularly polarized to receive both L1 and L2 GPS signals. Both bands have coincident phase centers.

Model 9836-800

Model OSA-77C, High Power SATCOM feed
This feed has been designed for use with standard offset reflectors having 40° edge angles. It operates in the SHF SATCOM frequency bands of 7.25 - 7.75 (receive) and 7.9 - 8.4 GHz (transmit). Polarization is RHCP and LHCP, respectively. The feed can handle 500 watts CW. Axial ratio is less than 2 dB and VSWR is less than 1.4. Its aperture window can be pressurized to 0.5 psig. Dimensions are 2.5 inches diameter and 12.75 inches long.

Model 9802-800 - Dual-band Monopulse Feed for 4.5M Axisymmetric Reflector
The 1.452 - 1.492 GHz downlink feed receives Worldspace satellite signals and incorporates a five-element monopulse circuit. The 7.025 - 7.075 GHz uplink feed is circularly polarized and handles 500 watts CW. The monopulse circuit allows the antenna to accurately point to the satellite using the downlink signal null. Both feeds have coincident phase centers.

Model 9821-800
Similar in function to Model 9802-800, except for 2.4M and 3.8M offset reflectors.

Model 9820-800 - L-band INMARSAT for an existing cassegrain subreflector
This simple feed system is mounted to the vertex of a large C-band Cassegrain subreflector to downlink INMARSAT signals. It is 6.25 inches diameter and 1/4 inch thick and does not degrade the C-band performance.

Model 9820-800

Model 8913-800 - High Efficiency and Low NOISE Temperature, Polarization-Switching Scalar Feed
Used as a high-performance prime focus feed for 12-foot reflector, this feed provides optimum aperture efficiency and low noise temperature. The exceptional bandwidth of 10.5 - 18 GHz encompasses many commonly-used frequencies. The scalar feedhorn is connected to a circular waveguide quarter-wave plate circular polarizer. A tapered rectangular-circular waveguide section is fixed to the feed supports. A 24 VDC motor and encoder rotate the scalar feed and the circular polarizer. In this way the polarization can be remotely changed to vertical, right-hand or left-hand circular polarization.

Model 8826-500, High Power Radar Simulator Feed
Designed to feed an offset rectangular reflector for a high power shipboard radar simulator, this innovative feed system consists of a pyramidal horn which uses the differential phase shift in the horn flare to create left-hand circular polarization. This design improves the RF power handling capability. It operates from 9.9 - 10.2 GHz with 75 KW peak power and 5 KW average power. The VSWR of the complete feed system is less than 1.15. Axial ratio is less than 2 dB. A low-loss, high pressure feed radome protects the system.

Model 8536-800 - Dual Frequency and Constant (same) 
Beamwidth Cassegrain Feed System
The customer requirement was for a replacement feed system for a 40-foot precision antenna. The new application demanded that the antenna have the same beamwidth at 5 GHz and 15 GHz. A special concentric feedhorn was developed and delivered. It used the existing Cassegrain subreflector, but under-illuminated the subreflector at 15 GHz and defocussed the 15 GHz phase center.  The resulting antenna was used in a series of tropospheric scatter propagation studies.

Model 9014-800 - High G/T Telemetry Feed System
Used with an accurate 24-foot reflector, this feed system was specified for demanding G/T performance. The feed system included a broadband (400 - 500 MHz) turnstile-type radiating element in a cavity.  Two 1 dB noise figure Low-Noise Amplifiers with 30 dB gain are provided in each feed output channel. RF filters are also provided to reject strong on-site VHF communications and S-band radar signals. A BIT signal injection probe is placed within the feed cavity so that the receive chain components could be calibrated and verified. 

Model 9702-800 - A Special-purpose,
Coaxial-Aperture Dual-band Feed
The low-band is 1.665 - 1.700 GHz and is right-hand circular polarized. The high-band is the DSS band of 12.2 - 12.75 GHz. The feed is designed to interface with the circular waveguide port of standard DSS LNBs. This prime focus feed enables the antenna to receive all DSS entertainment signals and to receive all weather imagery signals at L-band.

Model 9702-820 - A Special-purpose,
Coaxial-Aperture Dual-band Feed
The low-band is 1.525 - 1.661 GHz and is right-hand circular polarized. The high-band is the DSS band of 12.2 - 12.75 GHz. The feed is designed to interface with the circular waveguide port of standard DSS LNBs. This prime focus feed enables the antenna to receive all DSS entertainment signals. The low-band port interfaces with INMARSAT, AMSC and other communications satellites.