Antenna Repair Requirements Document.pdf

TELEMETRY ANTENNA REPAIR BUILDING 1161

Holloman High Speed Test Track

Requirements Document

For

704th Test Group/846th Test Squadron

10 June 2024

1.0 PURPOSE

The 704th Test Group (704 TG) mission is to be the premier provider of unique test and evaluation capabilities relevant to tomorrow’s warfighter through world-class people improving technical excellence, cost-effectiveness, and agility. The 846th Test Squadron (846 TS) is assigned to the 704 TG. The 846th Test Squadron which operates the Holloman High Speed Test Track conducts various tests which require telemetered data to be transmitted from a moving rocket sled to a central facility commonly known as the Track Data Center (building 1161). The vertically polarized antenna atop a 205 foot tower is currently inoperable and requires repair. Telemetry data is crucial to mission success for numerous programs.

2.0 SCOPE

2.1 Initial Inspection and Evaluation

2.1.1 The contractor shall evaluate and troubleshoot the cause of malfunction on a vertically polarized telemetry antenna located atop a 205-foot-tall tower at building 1161. Building 1161 is located at the Holloman High Speed Test Track. The entire system will need to be tested and evaluated from the telemetry ground station all the way to the antenna. If problems are located during evaluation and found to be something minor (loose connector, wire, etc.) they should be corrected during the evaluation. The contractor must be capable of repairing and/or replacing all components listed in sections 3.0 and 4.0 of this document.

2.1.2 The contractor shall identify any malfunctioning components and provide a detailed listing of additional recommendations to restore the system to operational condition if needed.

2.2 Over and Above Work

2.2.1 The contractor shall provide a proposal for the equipment and labor required to restore the system to operational condition if needed after the initial inspection and evaluation.

2.2.2 Additional recommended work will be considered over and above work and may be authorized upon approval by the Government. Price and schedule for the over and above work will be addressed prior to the option being exercised as needed.

3.0 SYSTEM DESCRIPTION

There are four antennas on the top of the 205 ft. tower (vertical, horizontal, left circular, and right circular).

Each antenna is connected to the telemetry ground station utilizing LDF4-50A coaxial cable. Each antenna has its own pre-amp and bandpass filter located in a single enclosure adjacent to the antennas. The pre-amps are powered by 12 volts DC which is injected into the coaxial cable on the telemetry ground station side. A DC pick-off is located on the antenna side inside the pre-amp enclosure to provide 12 volts DC to the pre-amps.

4.0 DESCRIPTION OF SYSTEM COMPONENTS

4.1 Vertical Antenna:

• Frequency: 2200-2400 Mhz

• Polarization: Vertical Linear

• Impedance: 50 ohms

• VSWR: 2.5:1 maximum

• Gain: 5.5 dBi nominal

Radiation Patterns:

• Azimuth – 175 degrees nominal beamwidth

• Zenith – 53 degrees nominal beamwidth

• Beam tilt – 22 degrees nominal

• Input Connector – Type N receptacle

Construction:

• Vertical dipole array backed by a metallic corner reflector.

4.2 Coaxial Cabling from Ground Station to Antenna

• ½” Foam Dielectric 50 Ohm Andrews type LDF4-50A cable terminated with N type connectors

4.3 Bandpass Filter

• Connectors – Type SMA

• Frequency Response – 2200 to 2400 MHz

• VSWR Max – 1.5:1

• Reject Frequency – 1900 MHz and 2700 MHz @ -50 dB

• Insertion Loss – -0.5 dB Maximum

• Impedance – 50 ohms @ 2200 to 2400 MHz

4.4 Low Noise Amplifier (LNA)

• Inputs – 1

• Outputs - 1

• Connectors – Type SMA

• Frequency – 2200 to 2400 MHz

• Gain – 35 dB

• VSWR – 1.5:1

• Impedance – 50 ohms at 2200 to 2400 MHz

4.5 Polyphaser DC Injector

• Surge – 18kA ANSI C62.1 8/20 sveform 110 Joules

• Turn-on – 17 VDC, -1 VDC +/-5%

• Turn-on Time - < 4ns for 2kV/ns

• Let Through dc Port - +26Vp, -23Vp open circuit - +/-10 kA 8/20

• Frequency Range – 2.2 to 2.4 GHz

• VSWR - ≤ 1.2 to 1 over the frequency range

• Insertion Loss - ≤ 0.3 dB over the frequency range

• User Current – 1.2 Adc continuous

• Temperature - -50° to 95° C

• Connectors – Type N Female

4.6 DC Pickoff

• Surge – 18kA ANSI C62.1 8/20 sveform 110 Joules

• Turn-on – 17 VDC, -1 VDC +/-5%

• Turn-on Time - < 4ns for 2kV/ns

• Let Through dc Port - +26Vp, -23Vp open circuit - +/-10 kA 8/20

• Frequency Range – 2.2 to 2.4 GHz

• VSWR - ≤ 1.2 to 1 over the frequency range

• Insertion Loss - ≤ 0.3 dB over the frequency range

• User Current – 1.2 Adc continuous

• Temperature - -50° to 95° C

• Connectors – Type N Female

5.0 MILESTONES

5.1 The vendor shall complete the inspection and evaluation within 14 days of contract award.

5.2 Schedule for the over and above work will be addressed prior to the option being exercised if needed.

6.0 DELIVERABLES

6.1 Unit POC: Patrick Nunnelley, Comm: 575-572-9013

6.2 The vendor shall perform service at Bldg 1161, physical address: 1910 Camera Pad Rd., Holloman AFB, NM 88330