Model 8942-800 - Dual Band Instrumentation Antenna Feed System
The application required a dual frequency (1200 & 3100 MHz) feed with coincident phase centers, 30 dB maximum cross-polarization and antenna sidelobes better than 22 dB down. A central horn was placed between a quad array of dipoles which were fed in phase. The structure was optimized for minimum primary pattern interaction and best isolation. Polarization and frequency band switching was provided with a remotely-actuated coaxial switch. The entire job, including testing the 20-foot antenna for secondary patterns, cross-polarization and gain, was accomplished in the short period of four months. The delivered antenna is being used as part of antenna range instrumentation for testing modern radars.

Model 8365-800 - Dual Band Dual Polarized UHF Feed
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 on the Seavey Engineering test range. The program took two months for completion.

Model 9221-800 - Prime Focus 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