I. CATV-Compatible Structural Design (F-Type Connector + Low-Power Optimization)

　　1. F-Type Male CATV-Specific Mechanical Structure

　　Interface Standards and CATV Compatibility:

　　The F-Type male connector (5/8-24 UNC thread size) conforms to CATV industry standards. The thread length is 9.5 ± 0.2mm, and the inner conductor (high-purity oxygen-free copper, diameter 1.8 ± 0.02mm) protrudes 2.2 ± 0.03mm. This connector perfectly fits the RG-6/RG-11 coaxial cable connectors and F-type female connectors commonly used in CATV systems. At a tightening torque of 3-6 N·m, the contact resistance is ≤ 3mΩ, preventing CATV signal attenuation caused by loose threads (measured signal transmission efficiency after tightening is ≥ 99.5%).

　　CATV Protection Design:

　　The connector and housing feature a PTFE waterproof seal (weatherproof temperature -40°C-80°C). Combined with the rubber dust cover on the outside of the housing, the enclosure achieves an IP54 protection rating, making it suitable for installation in damp/dusty environments such as CATV outdoor distribution boxes and corridor amplifiers. The housing is constructed of die-cast aluminum alloy (1.8mm thick) and features a lightweight design (weighing ≤12g), ensuring easy installation as a spare port for indoor set-top boxes while also withstanding minor outdoor impacts (impact resistance ≥5J).

　　2. 0.5W Low Power, Efficient Heat Dissipation, and Durability

　　Power Handling and Heat Dissipation Optimization:

　　Targeting CATV systems with signal power requirements of ≤0.5W (CATV amplifier output power is typically 0.1-0.3W), a 0.5W/°C low thermal resistance metal film load resistor (temperature coefficient ±15ppm/°C) is used. The resistor is directly bonded to the aluminum alloy housing (no additional heat dissipation structure is required, relying on the housing's natural heat dissipation). When operating at full 0.5W power, the maximum housing temperature remains ≤50°C (at an ambient temperature of 25°C), eliminating impedance drift due to overheating (impedance deviation ≤±0.5Ω), meeting the 24-hour continuous operation requirements of CATV systems.

　　Enhanced CATV Long-Term Durability:

　　The F-type male thread is nickel-plated (coating thickness ≥ 2μm) and has passed a 72-hour salt spray test without rust (suitable for outdoor CATV installations). The housing is painted with a matte anti-corrosion paint (matching CATV equipment color schemes, such as black or gray) to prevent glare from direct sunlight and enhance scratch resistance (measured surface hardness ≥ HB).

　　II. Core Performance (0.5W/DC-2.5GHz + CATV Signal Optimization)

　　1. Low Power and Wide Band Adaptability

　　Precise 0.5W Power Delivery:

　　With a continuous power carrying capacity of 0.5W (over the entire DC-2.5GHz band) and peak power (1ms pulses) of up to 2W, it fully covers low-power load scenarios such as CATV system distributor terminals, unloaded amplifier ports, and set-top box backup interfaces. After a 72-hour continuous load of a 0.3W CATV signal (typical amplifier output power), the test results showed no resistor burnout or significant impedance change (75Ω reference deviation ≤±0.3Ω), and insertion loss ≤0.08dB (DC-2.5GHz).

　　DC-2.5GHz CATV Full Band Coverage:

　　Perfectly compatible with the full-band CATV system signal range (50MHz VHF, 470-860MHz UHF, 950-2150MHz satellite IF, and 2.3-2.5GHz two-way data band), the VSWR (standing wave ratio) is ≤1.2:1 (corresponding to a reflection coefficient ≤-20dB) across all frequency bands. In the CATV core band (50MHz-2.15GHz), the VSWR is ≤1.15:1, effectively suppressing signal reflections that can cause snow and pixelation on CATV screens (measured reflection interference is reduced by over 90%).

　　2. CATV Signal Interference Prevention Performance

　　Low Noise and Signal Purity:

　　The load resistor utilizes a low-noise metal film process, achieving a noise figure of ≤-45dB (DC-2.5GHz). This eliminates the introduction of additional noise during CATV small signal transmission (such as μV-level satellite intermediate frequency signals), thus preventing interference with cable TV program quality. The internal PCB utilizes an FR-4 high-frequency substrate (dielectric constant 4.6±0.05), with microstrip line impedance control accuracy of ±0.5Ω, parasitic capacitance ≤0.4pF, and parasitic inductance ≤1.0nH. Signal phase distortion is eliminated (CATV bidirectional data transmission delay deviation ≤0.1μs).

　　CATV Electromagnetic Compatibility Design:

　　The housing utilizes a fully enclosed aluminum alloy structure with a shielding effectiveness of ≥75dB (DC-2.5GHz), effectively blocking electromagnetic interference from surrounding CATV systems (such as radiation from home routers and microwave ovens). In actual measurements, in a 2.4GHz WiFi environment, the CATV signal signal-to-noise ratio (SNR) dropped by ≤0.5dB, far exceeding the 1.5dB drop observed with conventional terminals.

　　III. CATV System Applications (Terminal Load + Signal Optimization)

　　1. Core Scenario: CATV Splitter/Amplifier Termination

　　Unused Splitter Port Termination:

　　Connects to unused F-type female ports on CATV 4/8-way splitters (such as unused ports in corridor junction boxes). Through precise 75Ω impedance matching and a VSWR of 1.2:1, this device prevents signal reflections caused by open circuits on unused ports and prevents interference with CATV signals on used ports. (After connection, the signal level fluctuation between adjacent ports was ≤0.2dB, with no snow or interference on the screen.)

　　Amplifier Unloaded Port Protection:

　　Connects to the unloaded output ports of CATV trunk amplifiers and building amplifiers. Its 0.5W power handling capacity absorbs redundant amplifier signals and prevents gain drift caused by signal reflections back into the amplifier. (After connection, the amplifier output power stability was ≤0.1dB/h, with no self-oscillation.)

　　2. Extended Scenario: CATV Terminal Equipment and Test Adaptation

　　Set-Top Box/Modem Backup Interface:

　　Serves as a backup F-type interface terminal for CATV set-top boxes and two-way data modems. It prevents external interference signals (such as noise introduced by damaged outdoor cables) from entering when the interface is unloaded, ensuring signal stability on the main interface. (After connecting the backup interface to the terminal, the CATV data transmission rate fluctuation on the main interface was measured to be ≤2Mbps, meeting the requirements of two-way broadcasting services.)

　　CATV Signal Tester Load:

　　Used with CATV field strength meters and spectrum analyzers, it serves as a terminal load for test signals under 0.5W (such as a remote load when measuring CATV cable loss). Its DC-2.5GHz wideband adaptability covers the full range of the tester, with a test error of ≤0.1dB (far better than the ±0.3dB tolerance for CATV testing).

　　IV. CATV Scenario Maintenance and Reliability Assurance

　　1. Routine Maintenance and Installation Adaptation

　　CATV Installation and Inspection:

　　For outdoor installations, ensure the F-type male connector is fully tightened (torque ≥ 3 N·m) and the housing dust cover is securely fastened. Quarterly, inspect the waterproof seals on outdoor terminals for aging (replace them promptly if cracked). Indoor terminals should be regularly cleaned of dust (gently wipe with a dry cloth dipped in anhydrous ethanol to avoid scratching the coating with metal tools).

　　CATV Equipment Compatibility:

　　Clearly marked with the "75Ω/F-type male connector/DC-2.5GHz/0.5W" parameters, prohibit connecting to 50Ω devices (such as microwave signal sources) or using excessive power (>0.5W) to avoid damage to precision equipment such as CATV splitters and amplifiers. This cable is compatible with commonly used RG-6/RG-11 CATV cables and can be connected directly without additional adapters.

　　2. Reliability and CATV Compliance

　　Environmental Adaptability:

　　Operating temperature range: -40°C-80°C (covering CATV outdoor cold/sun exposure and indoor ambient temperature), humidity ≤ 95% (non-condensing), impedance deviation ≤ ±0.6Ω at -40°C, and VSWR ≤ 1.25:1 at 80°C, meeting the requirements of CATV installations in diverse climates across China.

　　CATV Industry Compliance:

　　Complies with GB/T 11318.1-2019 "Cable Television System Measurement Methods" and EN 50083-2 "Cable Television System Cables and Components," and is RoHS 2.0 certified. Each batch of products comes with a CATV signal transmission test report (with VSWR and insertion loss data for the five key frequency points: 50MHz, 500MHz, 1GHz, 2GHz, and 2.5GHz).

　　Lifespan and Durability:

　　The F-type male connector has a plug-in/plug-out life of ≥300 cycles (the frequency of CATV system installation and commissioning). Contact resistance remains ≤5mΩ after 300 plug-in/plug cycles. Performance degradation is ≤5% after a 0.5W full-power cycle test (8 hours on/4 hours off, for a total of 2000 cycles). Under normal CATV conditions, the service life is ≥5 years.

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