Engineer Radio Electronic Communication case studies
Engineer Radio Electronic Communication · Put your knowledge to work in context.
The Engineer in Radio Electronic Communication is a professional engineering credential for people who design, operate, test, or regulate radio communication systems. Candidates typically hold an engineering or applied-science background and work in telecom operators, broadcasters, equipment manufacturers, defense and public-safety radio, spectrum regulators, or RF test laboratories. The Engineer Radio Electronic Communication case studies are 5 cases and about 4,794 words.
1Silo on the Path: An 18 GHz Hop Loses Its Fresnel Clearance
A regional utility runs a 12.4 km point-to-point link on 18 GHz between a hilltop repeater and a substation. Both ends use 0.6 m parabolic dishes mounted 40 m above local ground on flat farmland, vertical polarization.
1,005 words, about 5 min2Front-End Ordering in a 162.5 MHz Base Receiver
A systems integrator is building a VHF land-mobile base receiver on 162.5 MHz that must work within 2 km of a 1 kW FM broadcast mast and a high-power paging transmitter on 152 MHz. The candidate front end is a four-cavity preselector with 3.5 dB insertion loss, a low-noise amplifier with 1.0 dB noise figure and 20 dB gain, an image filter with 1.5 dB loss, and a mixer with 7 dB noise figure.
941 words, about 5 min3Modulation Choice for a 28 MHz Microwave Channel
A network operator must upgrade a licensed 7 GHz microwave link to carry 80 Mbit/s of net payload inside a 28 MHz channel. The hop is 22 km with 1.2 m dishes, and the radio supports adaptive modulation and coding with a channel roll-off of 0.25 and FEC rates from 1/2 to 7/8.
869 words, about 4 min4Two Transmitters, One Mast, and a Dead Receiver at 455 MHz
A water-tower site carries two 25 W PMR base transmitters on 450.000 MHz and 452.500 MHz, feeding separate vertically polarized colinear antennas 2 m apart on the same mast, plus a utility telemetry receiver on 455.000 MHz with a 12.5 kHz bandwidth. Since the second transmitter was commissioned, the telemetry link reports a raised noise floor and corrupted frames whenever both transmitters are keyed; keying either one alone causes no problem.
957 words, about 5 min5Enforcement Report on a 460 MHz PMR Installation
A regulator's monitoring team investigates interference reported by a taxi operator whose channel is the adjacent 12.5 kHz allocation at 460.7625 MHz. The suspect is a licensed PMR base on 460.7500 MHz.
1,022 words, about 5 min