Creech Tower PMI Report 2024 (2of4).pdf
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- Antenna Preventative Maintenance
- Solicitation number
- FA486126Q0028
About this file
This document is a Performance Maintenance Inspection (PMI) report for transmission lines, antennas, tower, and mounting hardware at Creech Air Force Base in Indian Springs, Nevada, dated September 18, 2024.
The inspection employed Distance-to-Fault (DTF) and Return Loss measurement testing using an Anritsu LMR Master S412E to verify system performance and identify failures in cable and antenna systems. The standard benchmark for system performance is 15 dB or better return loss. Four antennas were tested: RX Antenna 1 (WHITE) with measurement values at 57.28m; RX Antenna 2 (RED-RED) at 56.22m; TX Antenna 1 (BLUE) at 130 feet; and TX Antenna 2 (GREEN) at 43.02m. All antennas demonstrated passing return loss values across the 400 to 479 MHz frequency range, confirming compliance with operating specifications. The report includes detailed measurement graphs, site photographs documenting antenna installations and tower infrastructure, and cable connections. The conclusion confirms that all transmission lines tested within operating limits and that cable and antenna mounting hardware was securely fastened, indicating the tower and antenna systems are functioning properly and require no immediate corrective action.
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Table of Contents
Objective
Methodology
Results
Site Pictures
Conclusion
September 18, 2024
Creech AFB
RE: Tower / Antenna PMI
Objective The objective of this RF survey was to test and inspect the transmission lines, antennas, tower, and mounting hardware for Creech AFB.
Methodology Cables and antennas were tested with an Anritsu LMR Master S412E using Distance-to-Fault and Return Loss measurement tests. Distance To Fault (DTF) is a performance verification and failure analysis tool used for antenna and transmission line service and maintenance. DTF displays RF return loss or VSWR data versus distance. The effects of poor connections, damaged cables, or faulty antennas are quickly identified. Since DTF automatically accounts for attenuation versus distance, the display accurately indicates the return loss or VSWR of the antenna. These measurements show the user the match of the system and if it conforms to system engineering specifications. A poorly matched antenna will reflect costly RF energy which will not be available for transmission and will instead end up in the transmitter.
This extra energy returned to the transmitter will not only distort the signal, but it will also affect the efficiency of the transmitted power and the corresponding coverage area. While different systems have different acceptable return loss limits, 15 dB or better is a common system limit for a cable and antenna system.
Results Screenshots provided are the output of Anritsu’s Line Sweep Tools application using the measurements collected on site.
RX Antenna 1 (WHITE)
Distance-to-Fault Test indicates typical measurement value for a load/antenna at 57.28m
RX Antenna 1 (WHITE)
Return Loss Test indicates passing values for frequencies between 400 to 479 Mhz
RX Antenna 2 (RED-RED)
Test indicates typical measurement value for a load/antenna at 56.22m
RX Antenna 2 (RED-RED)
TX Antenna 1 (BLUE)
Test indicates typical measurement value for a load/antenna at 130ft
TX Antenna 1 (BLUE)
TX Antenna 2 (GREEN)
Test indicates typical measurement value for a load/antenna at 43.02m
TX Antenna 2 (GREEN)
Site Photos
Conclusion All transmission lines tested within operating limits. Cable and antenna mounting hardware was securely fastened.
Sincerely,
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