Initial commit

logseq/bak/pages/T8A/2025-05-01T13_42_07.988Z.Desktop.md

@@ -0,0 +1,85 @@
+T8A – Basic characteristics of FM and SSB; Bandwidth of various modulation modes: CW, SSB, FM, fast-scan TV; Choice of emission type: selection of USB vs LSB, use of SSB for weak signal work, use of FM for VHF packet and repeaters 
+
+- [[T8A01]] (C)
+Which of the following is a form of amplitude modulation? #card
+	- A. Spread spectrum
+	- B. Packet radio
+	- C. Single sideband
+	- D. Phase shift keying (PSK)
+--
+- [[T8A02]] (A)
+What type of modulation is commonly used for VHF packet radio transmissions? #card
+	- A. FM or PM
+	- B. SSB
+	- C. AM
+	- D. PSK
+--
+- [[T8A03]] (C)
+Which type of voice mode is often used for long-distance (weak signal) contacts on the VHF and UHF bands? #card
+	- A. FM
+	- B. DRM
+	- C. SSB
+	- D. PM
+--
+- [[T8A04]] (D)
+Which type of modulation is commonly used for VHF and UHF voice repeaters? #card
+	- A. AM
+	- B. SSB
+	- C. PSK
+	- D. FM or PM
+--
+- [[T8A05]] (C)
+Which of the following types of signal has the narrowest bandwidth? #card
+	- A. FM voice
+	- B. SSB voice
+	- C. CW
+	- D. Slow-scan TV
+--
+- [[T8A06]] (A)
+Which sideband is normally used for 10 meter HF, VHF, and UHF single-sideband communications? #card
+	- A. Upper sideband
+	- B. Lower sideband
+	- C. Suppressed sideband
+	- D. Inverted sideband
+--
+- [[T8A07]] (C)
+What is a characteristic of single sideband (SSB) compared to FM? #card
+	- A. SSB signals are easier to tune in correctly
+	- B. SSB signals are less susceptible to interference
+	- C. SSB signals have narrower bandwidth
+	- D. All these choices are correct
+--
+- [[T8A08]] (B)
+What is the approximate bandwidth of a typical single sideband (SSB) voice signal? #card
+	- A. 1 kHz
+	- B. 3 kHz
+	- C. 6 kHz
+	- D. 15 kHz
+--
+- [[T8A09]] (C)
+What is the approximate bandwidth of a VHF repeater FM voice signal? #card
+	- A. Less than 500 Hz 
+	- B. About 150 kHz
+	- C. Between 10 and 15 kHz
+	- D. Between 50 and 125 kHz
+--
+- [[T8A10]] (B)
+What is the approximate bandwidth of AM fast-scan TV transmissions? #card
+	- A. More than 10 MHz
+	- B. About 6 MHz
+	- C. About 3 MHz
+	- D. About 1 MHz
+--
+- [[T8A11]] (B)
+What is the approximate bandwidth required to transmit a CW signal? #card
+	- A. 2.4 kHz
+	- B. 150 Hz
+	- C. 1000 Hz
+	- D. 15 kHz
+--
+- [[T8A12]] (B)
+Which of the following is a disadvantage of FM compared with single sideband? #card
+	- A. Voice quality is poorer
+	- B. Only one signal can be received at a time
+	- C. FM signals are harder to tune
+	- D. All these choices are correct