CTTS-4313/RHM Collimation Tower Test Set 5.6 GHz Oscillator HP PIN Diode ARRA

CTTS-4313/RHM Collimation Tower Test Set 5.6 GHz Oscillator HP PIN Diode ARRA

The CTTS-4313/RHM is a portable, self-contained collimation tower test set built into a rugged aluminum and wood-laminate briefcase enclosure. It is a custom or contractor-built RF signal source and switching assembly designed for antenna collimation and alignment testing. The front panel is gold anodized and carries the designation "CTTS-4313/RHM" along with a bank of toggle switches, a variable attenuator control knob, an SMA RF output port, a fuse, and a power switch. This unit is being sold for parts or repair.

Specifications & What's Included

• Model: CTTS-4313/RHM
• Type: Portable Collimation Tower Test Set
• Oscillator frequency: 5.6 GHz
• Oscillator supply requirement: +30V DC at 0.2A (oscillator confirmed functional at this supply)
• Two potted power supplies (internal, epoxy-encapsulated)
• Two HP (Hewlett-Packard) PIN diode switches
• One ARRA variable attenuator (blue body, visible in interior)
• RF output: SMA female connector on front panel
• Front panel toggle switches: labeled C-BAND, CW, CODE 1, CODE 2, CODE 3, CODE 4, and additional unlabeled positions
• Variable ATTEN (attenuator) control knob on front panel
• Fuse and press-type fuse access on front panel
• Enclosure: portable aluminum-framed briefcase with wood-laminate top and bottom panels, corner clasps, and carry handle
• Internal RF interconnects via SMA coaxial cables and connectors
• Internal connector blocks and wiring harness visible in photos
• Small transformer visible internally

Applications

Collimation tower test sets like the CTTS-4313/RHM are used to align and verify the boresight of antennas, radar systems, and electro-optical sensors mounted on collimation towers or boresight ranges. The 5.6 GHz frequency places this instrument in the C-band microwave range, which was commonly used in military and aerospace antenna alignment facilities for radar and electronic warfare systems. The front panel switch labels — C-BAND, CW, and CODE positions — suggest the unit generates coded or keyed CW RF signals used during collimation procedures. The HP PIN diode switches enable fast RF switching between signal states, and the ARRA variable attenuator allows signal level adjustment at the RF output. Equipment of this type was typically deployed at military installations, defense contractor facilities, and government test ranges from the 1970s through the 1990s. This particular unit's portable briefcase form factor indicates it was designed for field use or transport between test sites.