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Modulation, Protocols and Modes Greg Wolfe KIØKK Thanks To Chapter 8 Modulation, Protocols and Modes Greg Wolfe KIØKK Thanks to: Information from: • The ARRL Library • ARRL Extra Class License Manual • Gordon West Extra Class License Class Chapter 8 - Digital Modes (G Wolfe - KI0KK) 2 1/11/2020 Section 8-1 Modulation Systems Chapter 8 - Digital Modes (G Wolfe - KI0KK) 3 1/11/2020 Modulation Review A radio wave can be thought of as having two parts: • The Carrier • The Modulation (the content) Each type of Modulation has it’s advantages and disadvantages and a typical bandwidth • CW (Continuous Wave or Morse code) ▄ 100Hz • SSB (Single SideBand)* ▄▄▄ 2.8 kHz • AM (Amplitude Modulation)* ▄▄▄▄▄▄ 6 kHz • FM (Frequency Modulation)* ▄▄▄▄▄▄▄▄▄▄ 1o kHz • TV ▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄ 6 MHz * Voice modulation is also called Phone modulation Chapter 8 - Digital Modes (G Wolfe - KI0KK) 4 1/11/2020 Emission Designators Pg. 8-2 8-1 Common Designators • Voice SSB : J3E (J3E2K80) • HF SSB Data: J2D Chapter 8 - Digital Modes (G Wolfe - KI0KK) 5 1/11/2020 Common Emission Designators Page 8-2 From the International Telecommunications Union - ITU Chapter 8 - Digital Modes (G Wolfe - KI0KK) 6 1/11/2020 Emission Types Page 8-3 The Amateur Radio regulations part 97 refers to emission types rather than emission designators Emission types are: • CW • Phone • RTTY • Data • Image • MCW (Modulated CW) • SS (Spread Spectrum) • Pulse • Test Chapter 8 - Digital Modes (G Wolfe - KI0KK) 7 1/11/2020 Frequency Modulation FM is the most common VHF mode • Voice • Data Chapter 8 - Digital Modes (G Wolfe - KI0KK) 8 1/11/2020 Frequency Modulation Viewed on a Spectrum Analyzer Page 8-3 A unmodulated An carrier is stable in unmodulated frequency carrier A FM With Frequency modulated Modulation, the carrier carrier shifts back and forth at the rate of How far the frequency the modulating deviates from the frequency carrier frequency is called the Deviation Chapter 8 - Digital Modes (G Wolfe - KI0KK) 9 1/11/2020 Deviation Ratio Pg. 8-3 The Deviation Ratio is the ratio of the maximum deviation to the highest modulating frequency [E8B09]. Equation 8.1 In narrow-band FM, the peak deviation is supposed to be 5 kHz or less. Chapter 8 - Digital Modes (G Wolfe - KI0KK) 10 1/11/2020 To Calculate the Deviation Ratio Pg. 8-3 & 4 To calculate deviation ratio of an FM signal, simply divide the maximum carrier frequency swing by the maximum modulation frequency. • The larger number is divided by the smaller number. If the peak deviation of a FM signal is 5 kHz and the maximum modulating frequency is 3 kHz, what is the deviation ratios? • Deviation Ratio = 5 kHz / 3 kHz = 1.67 (Example 8-1) [E8B05] Or if the peak deviation is 7.5 kHz and the maximum modulating frequency is 3.5 kHz, then: • Deviation ratio = 7.5 kHz / 3 kHz = 2.14 (Example 8-2) [E8B06] Chapter 8 - Digital Modes (G Wolfe - KI0KK) 11 1/11/2020 Let’s take a look at the FM Spectrum Deviation Radio of 1.67 Deviation Ratio of 3 Frequency spectrum of FM signals. Chapter 8 - Digital Modes (G Wolfe - KI0KK) 12 1/11/2020 Modulation Index Pg. 8-4 The Modulation Index is the ratio of the maximum deviation to the modulating frequency at any given instant [E8B01]. Equation 8.2 Chapter 8 - Digital Modes (G Wolfe - KI0KK) 13 1/11/2020 To Calculate the Modulation Index Pg. 8-4 To calculate the modulation index of an FM signal, simply divide the maximum carrier frequency swing by the instantaneous modulation frequency. • The larger number is divided by the smaller number. If the peak deviation of a FM signal is 3 kHz and the modulating frequency is 1 kHz, what is the modulation index? • Modulation index = 3 kHz / 1 kHz = 3 (Example 8-3)[E8B03] Or if the peak deviation is 6 kHz and the maximum modulating frequency is 2 kHz, then: • Deviation ratio = 6 kHz / 2 kHz = 3 (Example 8-4)[E8B04] Chapter 8 - Digital Modes (G Wolfe - KI0KK) 14 1/11/2020 Modulation Index As the modulation index increases, so does the width of the signal as viewed on a spectrum analyzer http://www.radio-electronics.com/info/rf-technology-design/fm-frequency-modulation/spectrum- bandwidth-sidebands.php Chapter 8 - Digital Modes (G Wolfe - KI0KK) 15 1/11/2020 Looking at Voice FM Modulation on a Spectrum Analyzer Amplitude Frequency Chapter 8 - Digital Modes (G Wolfe - KI0KK) 16 1/11/2020 What About the Operating Freq? Pg. 8-5 Notice that with either FM or PM, the deviation ratio and modulation index are independent of the RF carrier frequency (operating frequency). It doesn’t matter if the transmitter is a 10m rig, a 2m rig or a 23 cm rig. • Deviation Ratio = DMAX / M • Modulation Index = DMAX / m The maximum modulation index allowed by the FCC rules is 1 on frequencies below 29.5 MHz [E1B07]. Chapter 8 - Digital Modes (G Wolfe - KI0KK) 17 1/11/2020 Multiplexing Pg 8-5 Multiplexing means combining more than one stream of information into one modulated signal (baseband). The two common methods are: • Frequency division multiplexing (FDM) • Time division multiplexing (TDM) Chapter 8 - Digital Modes (G Wolfe - KI0KK) 18 1/11/2020 Frequency Division Multiplexing Pg. 8-5 With FDM, two or more information streams are merged together in a “baseband” signal that is used to modulate the carrier [E8B10]. Information Stream #1 Baseband Carrier Information Stream #2 Chapter 8 - Digital Modes (G Wolfe - KI0KK) 19 1/11/2020 Time Division Multiplexing Pg. 8-6 With TDM, two or more information streams are carried over a single channels by so that they occur in separate discreet time slots [E8B11]. In amateur radio, TDM is used mostly in telemetry, such as from satellites and digital voice modes such as D-Star DV. Information Stream #1 Information Packet Sync Sync Time Information Stream #2 Chapter 8 - Digital Modes (G Wolfe - KI0KK) 20 1/11/2020 How does the modulation index of a phase- modulated emission vary with RF carrier frequency (the operating frequency)? [E8B02] A. It increases as the RF carrier frequency increases B. It decreases as the RF carrier frequency increases C. It varies with the square root of the RF carrier frequency D. It does not depend on the RF carrier frequency Chapter 8 - Digital Modes (G Wolfe - KI0KK) 21 1/11/2020 What is the modulation index of an FM-phone signal having a maximum frequency deviation of 3000 Hz either side of the carrier frequency, when the modulating frequency is 1000 Hz? [E8B03] A. 3 B. 0.3 C. 3000 D. 1000 Chapter 8 - Digital Modes (G Wolfe - KI0KK) 22 1/11/2020 What is the highest modulation index permitted at the highest modulation frequency or angle modulation below 29.0 MHz? [E1B07] A. 0.5 B. 1.0 C. 2.0 D. 3.0 Chapter 8 - Digital Modes (G Wolfe - KI0KK) 23 1/11/2020 What is meant by deviation ratio? [E8B09] A. The ratio of the audio modulating frequency to the center carrier frequency B. The ratio of the maximum carrier frequency deviation to the highest audio modulating frequency C. The ratio of the carrier center frequency to the audio modulating frequency D. The ratio of the highest audio modulating frequency to the average audio modulating frequency Chapter 8 - Digital Modes (G Wolfe - KI0KK) 24 1/11/2020 Which of the following describes frequency division multiplexing? [E8B11] A. The transmitted signal jumps from band to band at a predetermined rate B. Two or more information streams are merged into a "baseband", which then modulates the transmitter C. The transmitted signal is divided into packets of information D. Two or more information streams are merged into a digital combiner, which then pulse position modulates the transmitter Chapter 8 - Digital Modes (G Wolfe - KI0KK) 25 1/11/2020 Section 8-2 Digital Protocols and Modes Chapter 8 - Digital Modes (G Wolfe - KI0KK) 26 1/11/2020 Digital Modes A digital mode consists of both a protocol and a method of modulation. Digital protocols can be used to convey speech , video or data. The advantage of using digital modes to transfer information is that the signal and its information can be copied and retransmitted multiple times without necessarily introducing errors. Chapter 8 - Digital Modes (G Wolfe - KI0KK) 27 1/11/2020 Digital Modes for HF General Review Frequency Shift Keying • RTTY Phase Shift Keying • PSK31 Packet Modes • PACTOR • WINMOR Chapter 8 - Digital Modes (G Wolfe - KI0KK) 28 1/11/2020 A Basic Digital Communication Setup Chapter 8 - Digital Modes (G Wolfe - KI0KK) 29 1/11/2020 Digital Communications Signal Formats The message is in different form throughout the communication system The Modem/TNC (Terminal Node Controller) may have significant “smarts” Uses USB or UART interface to computer Chapter 8 - Digital Modes (G Wolfe - KI0KK) 30 1/11/2020 Digital Communications Using a Sound Card The PC and the soundcard have the “smarts” The Audio Interface has no “smarts” and provides isolation between the computer and the radio The Audio interface can be eliminated by using an external sound card Audio Audio Tones Audio Tones USB/ Tones Data External Computer w/ Audio Radio Radio Computer Sound Card Interface Sound Card Chapter 8 - Digital Modes (G Wolfe - KI0KK) 31 1/11/2020 Digital Communications Using SDR Radios Modern SDR radios use internal sound cards (ICOM IC-7610, Flex 6400) Audio and Cat (Rig) control are passed inside the PC to the digital APP by specialized software applications Contact logging can be automated almost entirely Remote operation is possible USB/ USB/ Data Data Computer Radio W/Sound Card Radio Computer Chapter 8 - Digital Modes (G Wolfe - KI0KK) 32 1/11/2020 Data Speed and Symbols Pg 8-6 “Speed” is the rate of information transfer or data throughput • Air Link – the actual transmitted signal • The faster the rate, the wider the bandwidth required • Data Stream – the digital data to & from the computer The individual symbols that make a specific code are the elements Element • Letter “A”: dit dah; 00011; 01000001; 1111101 • Morse Code Baudot ASCII PSK-31 Varicode Each 1 and 0 is a Symbol Chapter 8 - Digital Modes (G Wolfe - KI0KK) 33 1/11/2020 A Look at Baud Rate Pg 8-6 The baud rate refers to the number of data symbols transmitted per second.
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