ABBREVIATIONS - H
| h | hour | | HAPS | High Altitude Platform Station | | HAT | Height Above Terrain | | HCE | Heater Control Electronics | | HCI | Host Computer Interface | | HCU | Hyper Combine Unit | | HDLC | High speed Data Link Control | | HDTV | High Definition Television | | HDX | Half Duplex | | HE | Heat Exchanger | | HEAO | High Energy Astronomy Observatory | | HEMT | High Electron Mobility Transistor | | HEOS | Highly Eccentric Orbit Satellite | | HF | High Frequency | | HF | Human Factors | | HGA | High Gain Antenna | | HL | High Load | | HLES | Home Land Earth Station | | HLLV | Heavy Lift Launch Vehicle | | HM | Hybrid Modulation | | HNMC | Hub Network Management Computer | | HP | Horsepower | | HPA | High Power Amplifier | | HPC | High Power Converter | | HPF | High Pass Filter | | HPM | Hybrid Phase Modulation | | HPP | Host Protocol Processor | | HRC | Hypothetical Reference Circuit | | HRDP | Hypothetical Reference Digital Path | | HRX | Hypothetical Reference Connection | | HSC | Hangover Control and Signal Classification | | HSD | High Speed Data | | HSP | Host Satellite Processor | | HTF | Hub Terminal Facility | | HTML | Hypertext Mark-up Language | | HTTP | Hypertext Transfer Protocol | | HU | High Usage Circuit | | HVCS | Half Voice Circuits | | HYPACE | Hybrid Programmable Attitude Control Electronics | | Hz | Hertz - cycles per second |
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