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9 Cards in this Set
- Front
- Back
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SSB & benefits |
- HF transceiver Removes 1 sideband and carrier wave to inc transmission pwr, adds them again at receiver 1. Inc range of HF transmissions 2. Inc signal strength 3. Greater signal coverage |
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SELCAL |
Reduce static noise in cockpit Utilizes HF fqz range |
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HF radio |
LR communication via skywaves
Max range: sun up dial up (high fqz)
Reception of HF transmissions dependent on: - distance from transmitter - time of day |
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Datalink |
- advanced transponder system (mode S) - auto transmits a/c speed, RoC, clearance acknowledgement direct to controller |
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Radio waves |
- produced when high fqz AC sent through a conductor (antenna) - fqz = no. of cycles/sec (in Hz) - cycle = time to complete full wave - high fqz = short wave length - amplitude = width of wave |
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Ground waves |
- VLF/ LF/ MF -Bend/refract following curvature of surface (diffraction) - causes waves to lose energy through attenuation *lower fqz attenuated less - greater reception distance
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Sky waves |
- HF *reception better at night, as ionosphere lower - signal travel further, but will also inc skip zone
*Attenuation of HF fqz range - most prevalent in higher HF fqzs
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Space wave |
- VHF range and above
Range limited to: - transmitter power - line of sight
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Quality of HF transmission varies with |
1. Time of day 2. Season 3. Solar cycle |
