{"id":18459,"date":"2026-11-07T07:02:07","date_gmt":"2026-11-07T01:32:07","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=18459"},"modified":"2026-11-09T08:17:17","modified_gmt":"2026-11-09T02:47:17","slug":"ham-radio-exam-preparation-amateur-radio-satellite-communications","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/ham-radio-exam-preparation-amateur-radio-satellite-communications\/","title":{"rendered":"Ham Radio Exam Preparation:\u00a0Amateur Radio Satellite Communications"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1208\" height=\"675\" src=\"https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2026\/11\/image-4.png\" alt=\"\" class=\"wp-image-18492\"\/><\/figure>\n\n\n\n<!-- \n  SECURITY REVIEW NOTE: \n  This code uses 100% vanilla HTML5 and CSS. 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What does the term &#8220;AOS&#8221; stand for in satellite communications?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) Angle of Sight<\/li>\n      <li>B) Acquisition of Signal<\/li>\n      <li>C) Amplitude Over Squelch<\/li>\n      <li>D) Antenna Orientation System<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: B) Acquisition of Signal<\/span>\n        <p class=\"sat-explanation\">AOS is the exact time a satellite rises above the horizon and its radio signal can first be received by a ground station.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 2 -->\n  <div class=\"sat-question-card\">\n    <h3>2. What does &#8220;LOS&#8221; stand for regarding a satellite pass?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) Line of Sight<\/li>\n      <li>B) Loss of Signal<\/li>\n      <li>C) Lower Orbit Sync<\/li>\n      <li>D) Latitude Offset System<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: B) Loss of Signal<\/span>\n        <p class=\"sat-explanation\">LOS is the time when the satellite drops below the horizon and the ground station can no longer receive its signal.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 3 -->\n  <div class=\"sat-question-card\">\n    <h3>3. Most amateur radio satellites operate in which type of orbit?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) Geostationary Orbit (GEO)<\/li>\n      <li>B) Low Earth Orbit (LEO)<\/li>\n      <li>C) Medium Earth Orbit (MEO)<\/li>\n      <li>D) Highly Elliptical Orbit (HEO)<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: B) Low Earth Orbit (LEO)<\/span>\n        <p class=\"sat-explanation\">The majority of amateur satellites are in LEO, typically 400 to 800 km above the Earth, resulting in fast passes lasting 10 to 15 minutes.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 4 -->\n  <div class=\"sat-question-card\">\n    <h3>4. How does the Doppler effect alter a satellite&#8217;s downlink frequency as it approaches your station?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) The frequency appears to shift lower.<\/li>\n      <li>B) The frequency appears to shift higher.<\/li>\n      <li>C) The frequency rapidly fluctuates up and down.<\/li>\n      <li>D) The frequency remains exactly the same.<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: B) The frequency appears to shift higher.<\/span>\n        <p class=\"sat-explanation\">As the satellite speeds toward you, the radio waves are compressed, making the frequency appear higher than it actually is. It shifts lower as it moves away.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 5 -->\n  <div class=\"sat-question-card\">\n    <h3>5. If an amateur satellite is designated as &#8220;Mode V\/U&#8221;, what does this mean?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) It uses Vertical and Unpolarized antennas.<\/li>\n      <li>B) It transmits on VHF and receives on UHF.<\/li>\n      <li>C) It receives (uplink) on VHF and transmits (downlink) on UHF.<\/li>\n      <li>D) It uses Voice and Unmodulated CW.<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: C) It receives (uplink) on VHF and transmits (downlink) on UHF.<\/span>\n        <p class=\"sat-explanation\">Mode designators usually list the Uplink band first, followed by the Downlink band. V is for VHF (2m) and U is for UHF (70cm).<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 6 -->\n  <div class=\"sat-question-card\">\n    <h3>6. What is a satellite&#8217;s &#8220;footprint&#8221;?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) The physical size of its solar panels.<\/li>\n      <li>B) The geographic area on Earth that is within line-of-sight of the satellite.<\/li>\n      <li>C) The exact coordinates of its ground control station.<\/li>\n      <li>D) The amount of space debris it leaves behind.<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: B) The geographic area on Earth that is within line-of-sight of the satellite.<\/span>\n        <p class=\"sat-explanation\">Any two stations located within the satellite&#8217;s footprint at the same time can theoretically communicate with each other through the satellite.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 7 -->\n  <div class=\"sat-question-card\">\n    <h3>7. What is the purpose of Keplerian elements (Keps)?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) They are used by software to calculate and predict a satellite&#8217;s orbit and pass times.<\/li>\n      <li>B) They dictate the power output of the satellite.<\/li>\n      <li>C) They decode digital telemetry from the satellite.<\/li>\n      <li>D) They measure the temperature of the satellite&#8217;s batteries.<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: A) They are used by software to calculate and predict a satellite&#8217;s orbit and pass times.<\/span>\n        <p class=\"sat-explanation\">Keplerian elements are mathematical data sets that define the exact shape, size, and orientation of a satellite&#8217;s orbit around Earth.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 8 -->\n  <div class=\"sat-question-card\">\n    <h3>8. What is meant by &#8220;full-duplex&#8221; operation in satellite communications?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) Transmitting with 100 watts of power.<\/li>\n      <li>B) Using two different radios tied to one antenna.<\/li>\n      <li>C) Transmitting on the uplink while simultaneously listening to your own signal on the downlink.<\/li>\n      <li>D) Communicating with two different satellites at once.<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: C) Transmitting on the uplink while simultaneously listening to your own signal on the downlink.<\/span>\n        <p class=\"sat-explanation\">Full-duplex allows you to hear yourself coming back from space in real-time, confirming you are successfully hitting the satellite and not stepping on another station.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 9 -->\n  <div class=\"sat-question-card\">\n    <h3>9. What is an FM satellite (often called an FM bird)?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) A satellite that broadcasts commercial FM radio.<\/li>\n      <li>B) A single-channel repeater in space using Frequency Modulation.<\/li>\n      <li>C) A satellite that only transmits Morse code telemetry.<\/li>\n      <li>D) A satellite that translates a wide band of frequencies simultaneously.<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: B) A single-channel repeater in space using Frequency Modulation.<\/span>\n        <p class=\"sat-explanation\">An FM satellite acts much like a terrestrial repeater. Only one person can talk through it at a time.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 10 -->\n  <div class=\"sat-question-card\">\n    <h3>10. What is a linear transponder satellite?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) A satellite that moves in a perfectly straight line.<\/li>\n      <li>B) A satellite that only receives vertically polarized signals.<\/li>\n      <li>C) A system that receives a wide band of frequencies and retransmits them simultaneously on another band.<\/li>\n      <li>D) An FM repeater that requires a linear amplifier.<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: C) A system that receives a wide band of frequencies and retransmits them simultaneously on another band.<\/span>\n        <p class=\"sat-explanation\">Unlike an FM repeater, a linear transponder can support dozens of simultaneous SSB or CW QSOs across its passband.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 11 -->\n  <div class=\"sat-question-card\">\n    <h3>11. Why should you NEVER transmit FM voice into a linear transponder?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) It will cause the satellite to de-orbit.<\/li>\n      <li>B) The 100% duty cycle of FM drains the satellite&#8217;s limited battery and hogs the passband power.<\/li>\n      <li>C) The satellite will permanently lock onto your callsign.<\/li>\n      <li>D) FM signals cannot penetrate the ionosphere.<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: B) The 100% duty cycle of FM drains the satellite&#8217;s limited battery and hogs the passband power.<\/span>\n        <p class=\"sat-explanation\">Linear transponders share their total power output among all active signals. A strong FM signal will capture most of the satellite&#8217;s power, suppressing other SSB\/CW users and severely draining the batteries.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 12 -->\n  <div class=\"sat-question-card\">\n    <h3>12. Which antenna polarization is highly recommended for satellite work to reduce fading?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) Strictly Vertical<\/li>\n      <li>B) Strictly Horizontal<\/li>\n      <li>C) Circular Polarization<\/li>\n      <li>D) Isotropic Polarization<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: C) Circular Polarization<\/span>\n        <p class=\"sat-explanation\">Circularly polarized antennas (like a crossed-Yagi) help combat &#8220;spin fading&#8221; as the satellite tumbles in orbit, and mitigate Faraday rotation caused by the ionosphere.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 13 -->\n  <div class=\"sat-question-card\">\n    <h3>13. What is &#8220;Faraday Rotation&#8221;?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) The physical spinning of the satellite to maintain gyroscopic stability.<\/li>\n      <li>B) The rotation of the polarization plane of a radio wave as it travels through the ionosphere.<\/li>\n      <li>C) A method of rotating a Yagi antenna by hand.<\/li>\n      <li>D) The orbit of the Earth around the Sun.<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: B) The rotation of the polarization plane of a radio wave as it travels through the ionosphere.<\/span>\n        <p class=\"sat-explanation\">This phenomenon causes a linearly polarized signal (like purely vertical or horizontal) to twist as it passes through the ionosphere, causing severe fading if the receiving antenna&#8217;s polarization does not match.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 14 -->\n  <div class=\"sat-question-card\">\n    <h3>14. When referring to a satellite pass, what does &#8220;Elevation&#8221; mean?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) The compass direction of the satellite.<\/li>\n      <li>B) The altitude of the satellite above sea level in kilometers.<\/li>\n      <li>C) The angle of the satellite above the observer&#8217;s horizon, measured in degrees.<\/li>\n      <li>D) The height of your antenna mast.<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: C) The angle of the satellite above the observer&#8217;s horizon, measured in degrees.<\/span>\n        <p class=\"sat-explanation\">0 degrees is the horizon, and 90 degrees is directly overhead (zenith). A high maximum elevation means the satellite will pass almost directly above you.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 15 -->\n  <div class=\"sat-question-card\">\n    <h3>15. When referring to a satellite pass, what does &#8220;Azimuth&#8221; mean?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) The compass heading (0 to 360 degrees) of the satellite from your location.<\/li>\n      <li>B) The angle above the horizon.<\/li>\n      <li>C) The speed of the satellite.<\/li>\n      <li>D) The frequency drift caused by Doppler.<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: A) The compass heading (0 to 360 degrees) of the satellite from your location.<\/span>\n        <p class=\"sat-explanation\">Azimuth tells you which direction to point your antenna. 0\u00b0 is North, 90\u00b0 is East, 180\u00b0 is South, and 270\u00b0 is West.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 16 -->\n  <div class=\"sat-question-card\">\n    <h3>16. Why do many FM amateur satellites require a CTCSS (PL) tone on the uplink?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) To encrypt the communication.<\/li>\n      <li>B) To prevent the satellite&#8217;s receiver from being keyed up by terrestrial noise or unintended interference.<\/li>\n      <li>C) To increase the transmit power of the ground station.<\/li>\n      <li>D) To measure the Doppler shift accurately.<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: B) To prevent the satellite&#8217;s receiver from being keyed up by terrestrial noise or unintended interference.<\/span>\n        <p class=\"sat-explanation\">Because the satellite&#8217;s &#8220;footprint&#8221; covers millions of square miles, it hears a lot of RF noise. The sub-audible tone ensures the satellite only repeats intentional amateur transmissions.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 17 -->\n  <div class=\"sat-question-card\">\n    <h3>17. What is an inverting linear transponder?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) It physically flips upside down in orbit.<\/li>\n      <li>B) It changes AM signals into FM signals.<\/li>\n      <li>C) It retransmits an Upper Sideband (USB) uplink signal as a Lower Sideband (LSB) downlink signal.<\/li>\n      <li>D) It reverses the audio so you must speak backward.<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: C) It retransmits an Upper Sideband (USB) uplink signal as a Lower Sideband (LSB) downlink signal.<\/span>\n        <p class=\"sat-explanation\">Inverting transponders subtract the uplink frequency from a local oscillator. This reverses the sideband (USB becomes LSB) and means tuning *up* on the uplink causes the downlink to move *down*.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 18 -->\n  <div class=\"sat-question-card\">\n    <h3>18. What is the &#8220;Apogee&#8221; of a satellite&#8217;s orbit?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) The point where it re-enters the atmosphere.<\/li>\n      <li>B) The point in its orbit where it is closest to Earth.<\/li>\n      <li>C) The point in its orbit where it is furthest from Earth.<\/li>\n      <li>D) The moment the solar panels deploy.<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: C) The point in its orbit where it is furthest from Earth.<\/span>\n        <p class=\"sat-explanation\">Apogee is the highest altitude of an elliptical orbit. At apogee, the satellite moves slower across the sky, providing a longer communications window but requiring better antennas due to the increased distance.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 19 -->\n  <div class=\"sat-question-card\">\n    <h3>19. What is the &#8220;Perigee&#8221; of a satellite&#8217;s orbit?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) The point where it is closest to Earth.<\/li>\n      <li>B) The point where it is furthest from Earth.<\/li>\n      <li>C) The exact center of its footprint.<\/li>\n      <li>D) The frequency of its beacon.<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: A) The point where it is closest to Earth.<\/span>\n        <p class=\"sat-explanation\">At perigee, the satellite is at its lowest altitude, meaning it moves extremely fast across the sky, resulting in a very short, fast pass with rapid Doppler shift.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 20 -->\n  <div class=\"sat-question-card\">\n    <h3>20. When adjusting for Doppler shift on a V\/U (VHF up, UHF down) FM satellite, which frequency requires the most manual tuning during the pass?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) The VHF Uplink<\/li>\n      <li>B) The UHF Downlink<\/li>\n      <li>C) Both require exactly the same amount of tuning<\/li>\n      <li>D) No tuning is required on FM<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: B) The UHF Downlink<\/span>\n        <p class=\"sat-explanation\">Doppler shift is directly proportional to frequency. At 435 MHz (UHF), the shift is roughly \u00b110 kHz, which is significant enough that you must tune your receiver down as the satellite passes. The VHF shift is usually small enough (~\u00b13 kHz) that an FM receiver can tolerate it without adjusting the uplink.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 21 -->\n  <div class=\"sat-question-card\">\n    <h3>21. What is a satellite &#8220;Beacon&#8221;?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) A flashing strobe light on the satellite.<\/li>\n      <li>B) A continuous or periodic radio transmission carrying telemetry and identification data.<\/li>\n      <li>C) A distress signal sent by the ground station.<\/li>\n      <li>D) A radar reflector for tracking.<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: B) A continuous or periodic radio transmission carrying telemetry and identification data.<\/span>\n        <p class=\"sat-explanation\">Beacons allow ground stations to locate the satellite, determine its operational status (battery voltage, temperature), and lock onto the Doppler shift before attempting a QSO.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 22 -->\n  <div class=\"sat-question-card\">\n    <h3>22. Which of the following is a common portable directional antenna used for satellite operations?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) Half-wave dipole<\/li>\n      <li>B) Arrow Antenna (handheld dual-band Yagi)<\/li>\n      <li>C) End-fed half-wave wire<\/li>\n      <li>D) Magnetic Loop<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: B) Arrow Antenna (handheld dual-band Yagi)<\/span>\n        <p class=\"sat-explanation\">The Arrow Antenna (and the Elk Log Periodic) are lightweight, handheld directional antennas that allow an operator to physically point at the satellite and track it across the sky.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 23 -->\n  <div class=\"sat-question-card\">\n    <h3>23. What is a &#8220;Passband&#8221;?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) A wristband worn by satellite operators.<\/li>\n      <li>B) The specific range of frequencies a linear transponder receives and retransmits.<\/li>\n      <li>C) The geographic area the satellite flies over.<\/li>\n      <li>D) The speed at which the satellite orbits.<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: B) The specific range of frequencies a linear transponder receives and retransmits.<\/span>\n        <p class=\"sat-explanation\">For example, a satellite might have a passband of 30 kHz. Any signal transmitted into that 30 kHz window on the uplink band will be translated and repeated on the downlink band.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 24 -->\n  <div class=\"sat-question-card\">\n    <h3>24. If a satellite is operating in Mode L\/U, what bands are involved?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) Low Frequency uplink, Ultra High Frequency downlink<\/li>\n      <li>B) L-Band (1.2 GHz \/ 23cm) uplink, UHF (70cm) downlink<\/li>\n      <li>C) Longwave uplink, UHF downlink<\/li>\n      <li>D) Laser uplink, UHF downlink<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: B) L-Band (1.2 GHz \/ 23cm) uplink, UHF (70cm) downlink<\/span>\n        <p class=\"sat-explanation\">In standard satellite band designators, &#8220;L&#8221; stands for the L-band (1.2 GHz \/ 23cm amateur band), and &#8220;U&#8221; stands for the UHF (432 MHz \/ 70cm amateur band).<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n  <!-- Question 25 -->\n  <div class=\"sat-question-card\">\n    <h3>25. What is the most appropriate way to call CQ on an FM satellite?<\/h3>\n    <ul class=\"sat-options\">\n      <li>A) &#8220;CQ CQ CQ, this is VU2.. calling CQ Satellite and standing by.&#8221;<\/li>\n      <li>B) Play a pre-recorded CQ loop for 5 minutes.<\/li>\n      <li>C) Briefly state your callsign and grid square, e.g., &#8220;VU2.. MK71&#8221;<\/li>\n      <li>D) Send a slow CW identification.<\/li>\n    <\/ul>\n    <details>\n      <summary class=\"sat-summary\">Reveal Answer &#038; Explanation<\/summary>\n      <div class=\"sat-details\">\n        <span class=\"sat-answer-text\">Answer: C) Briefly state your callsign and grid square, e.g., &#8220;VU2.. MK71&#8221;<\/span>\n        <p class=\"sat-explanation\">FM satellite passes are very short and highly congested. Long &#8220;CQ&#8221; calls are heavily discouraged. Operators simply drop their callsign and Maidenhead Grid Square to initiate rapid contacts.<\/p>\n      <\/div>\n    <\/details>\n  <\/div>\n\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>1. What does the term &#8220;AOS&#8221; stand for in satellite communications? A) Angle of Sight B) Acquisition of Signal C) Amplitude Over Squelch D) Antenna Orientation System Reveal Answer &#038; Explanation Answer: B) Acquisition of Signal AOS is the exact time a satellite rises above the horizon and its radio signal can first be received [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":18460,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-18459","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amateur-radio-ham-radio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ham Radio Exam Preparation:\u00a0Amateur Radio Satellite Communications - Johnson&#039;s Techworld<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/johnsonfrancis.org\/techworld\/ham-radio-exam-preparation-amateur-radio-satellite-communications\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ham Radio Exam Preparation:\u00a0Amateur Radio Satellite Communications - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"1. What does the term &#8220;AOS&#8221; stand for in satellite communications? 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