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G2A

OPERATING PROCEDURES

- Phone operating procedures: USB/LSB conventions, breaking into a contact, transmitter setup for voice operation; answering DX stations

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G2A011 of 12

Which mode is most commonly used for voice communications on frequencies of 14 MHz or higher?

Why Amateur SSB practice follows a long-standing convention: lower sideband is used on 160, 80/75 and 40 meters, while upper sideband is used on 20 meters (14 MHz) and every band above it, including 60 meters and all VHF/UHF SSB. There is no technical reason one sideband works better; it is simply the operating custom so everyone's audio is intelligible to everyone else. Modern radios switch automatically at the band edge, but you should know the dividing line yourself.
Watch out Lower sideband is the right answer only below 10 MHz, on 160, 80/75 and 40 meters; the other two choices are not standard amateur voice modes (all SSB has a suppressed carrier, and double sideband is essentially unused AM-style transmission).
Below 10 MHz go Low (LSB), 14 MHz and Up go Upper (USB).
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
G2A022 of 12

Which mode is most commonly used for voice communications on the 160-, 75-, and 40-meter bands?

Why By long-standing amateur convention, SSB voice below 10 MHz uses lower sideband, and above 10 MHz uses upper sideband. The 160-, 75- and 40-meter bands are all below 10 MHz, so they are LSB bands. This is a custom rather than an FCC rule, but everyone follows it so that stations can hear each other properly.
Watch out Upper sideband is the convention for 20 meters and higher (and for VHF/UHF SSB and all HF digital work), not for the low bands. 'Suppressed sideband' and 'double sideband' are not operating modes you select on a radio; SSB by definition suppresses the other sideband and the carrier.
Below 10 MHz go Low (LSB), above 10 MHz go Up (USB). 160/75/40 are all below, so LSB.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
G2A033 of 12

Which mode is most commonly used for SSB voice communications in the VHF and UHF bands?

Why By long-standing convention, amateurs use lower sideband on 160, 80/75 and 40 meters, and upper sideband on 20 meters and everything higher, including 60 meters and all the VHF and UHF SSB weak-signal segments. So SSB work on 6 meters, 2 meters, 222 MHz and 432 MHz is done on upper sideband. This is operating practice, not an FCC rule, but everyone follows it so stations can hear each other intelligibly.
Watch out Lower sideband is the convention only on the bands below 10 MHz; using it on 2 meters would leave your audio unreadable to stations listening on USB.
LSB below 10 MHz, USB above. VHF/UHF is way above, so it is always upper sideband.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
G2A044 of 12

Which mode is most commonly used for voice communications on the 17- and 12-meter bands?

Why Amateur SSB convention puts lower sideband on 160, 80/75 and 40 meters, and upper sideband on 20 meters and higher, which includes the 17- and 12-meter WARC bands. This is custom rather than FCC rule, but everyone follows it so contacts are intelligible. USB is also the standard on 60 meters and on VHF/UHF weak-signal SSB.
Watch out Lower sideband is the convention only on the bands below 10 MHz (160, 80/75 and 40 meters); pick it on 17 or 12 meters and you would sound like gibberish to everyone listening.
20 meters and up, use upper. Below 20, go lower.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
G2A055 of 12

Which mode of voice communication is most commonly used on the HF amateur bands?

Why Single sideband is the standard voice mode below 30 MHz because it packs a voice signal into about 3 kHz of bandwidth and puts essentially all of the transmitter power into the information-carrying sideband, with no carrier and no redundant second sideband. That makes it far more spectrum-efficient and far better for weak-signal, long-distance work than AM or FM. FM is used on HF only in a few narrow segments such as parts of 10 meters, and full double sideband AM is a niche mode.
Watch out Double sideband AM is what SSB was derived from, but it uses roughly twice the bandwidth and wastes most of the power in the carrier, so it is rare on crowded HF bands. Frequency modulation needs far more bandwidth than HF band plans allow for general use.
HF is crowded, so use the narrow mode: SSB, about 3 kHz, no carrier, no wasted sideband.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
G2A066 of 12

Which of the following is an advantage of using single sideband, as compared to other analog voice modes on the HF amateur bands?

Why SSB transmits only one sideband and suppresses the carrier and the other sideband, so it occupies about 3 kHz instead of the roughly 6 kHz an AM signal needs. Because no transmitter power is wasted on a carrier that carries no information, all of the output goes into the intelligence-bearing sideband, giving much better talk power for a given rig. That combination of narrow bandwidth and power efficiency is why SSB dominates HF voice operating.
Watch out High-fidelity audio and easy tuning actually describe AM, which has a carrier to zero-beat against and wider audio response; FM is the mode that resists impulse and static-crash noise, and it is used on VHF/UHF rather than HF.
SSB = half the bandwidth, none wasted on a carrier. AM for fidelity, FM for noise, SSB for efficiency.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
G2A077 of 12

Which of the following statements is true of single sideband (SSB)?

Why SSB is a form of amplitude modulation in which the balanced modulator removes the carrier and a filter (or phasing network) removes one of the two redundant sidebands, so all transmitter power goes into the single remaining sideband carrying the voice information. That makes it roughly a third the bandwidth of full AM (about 3 kHz versus 6 kHz) and far more power efficient, since no energy is wasted on a carrier that carries no information. Both sidebands contain the same audio, so discarding one loses nothing.
Watch out The choice that keeps the carrier describes single sideband with reduced or full carrier, which is not standard amateur SSB; ordinary double sideband AM keeps the carrier and both sidebands. The choices about SSB being the only authorized voice mode are simply false, since AM, FM, and digital voice are also permitted on HF phone segments.
SSB = Suppress carrier, Suppress one Sideband. One sideband survives, that's all.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
G2A088 of 12

What is the recommended way to break into a phone contact?

Why On SSB phone, the accepted way to join an ongoing QSO is to wait for a natural pause between transmissions and simply give your call sign once, clearly. That identifies you legally and lets the stations in contact decide whether to invite you in. Repeating it over and over or using CB-style jargon just clutters the frequency and wastes time.
Watch out "QRZ" is the Q signal meaning "who is calling me?" and is used by a station that has heard an unidentified caller, not by the station trying to break in; "CQ" is a general call to anyone, which is not what you are doing when two stations are already talking.
Break in with your call sign once, not twice, not "breaker breaker." Amateur radio is not CB.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
G2A099 of 12

Why do most amateur stations use lower sideband on the 160-, 75-, and 40-meter bands?

Why There is nothing electrically special about either sideband; a transmitter produces the same signal quality with LSB or USB. The split at LSB below 10 MHz (160, 75/80 and 40 meters) and USB above (20, 17, 15, 12, 10 meters, plus 60 meters and VHF/UHF SSB) is simply long-standing amateur custom, kept because everyone must select the same sideband to be intelligible. FCC rules do not specify which sideband to use, so this is operating practice, not regulation.
Watch out The efficiency claim is wrong because both sidebands carry identical information with identical power; the legality claim is wrong because Part 97 does not dictate sideband choice on those bands.
Below 10 MHz go Low (LSB), above 10 MHz go Up (USB), and it is custom, not law.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
G2A1010 of 12

Which of the following statements is true of VOX operation versus PTT operation?

Why VOX stands for Voice Operated Transmit (or voice operated relay): audio picked up by the microphone automatically keys the transmitter, and it unkeys after a short delay when you stop talking. That means you do not have to hold or press a PTT switch, so your hands stay free for logging, tuning, or running a contest. The transmitted signal itself is identical to PTT operation; only the keying method changes.
Watch out Nothing about VOX changes the signal itself, so the ideas that it sounds more natural, narrows bandwidth, or raises power output are all wrong. Bandwidth and power output are set by the mode and the transmitter, not by how the rig gets keyed.
VOX = Voice Operated Transmit: your voice is the switch, so your hands are free.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
G2A1111 of 12

Generally, who should respond to a station in the contiguous 48 states calling "CQ DX"?

Why "DX" means distance, that is, foreign or far-away stations. When a station in the lower 48 calls CQ DX, it is asking for contacts outside that area, which includes Alaska, Hawaii, US territories and foreign countries. Stations within the contiguous 48 should let the call go by so the DX station can be heard, since the caller is deliberately filtering for the harder contacts.
Watch out "Any caller is welcome" describes a plain "CQ", not "CQ DX"; adding DX is precisely what narrows the invitation.
DX = distance. CQ DX means "not my neighbors": answer only if you are outside the lower 48.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
G2A1212 of 12

What control is typically adjusted for proper ALC setting on a single sideband transceiver?

Why ALC (automatic level control) monitors the transmitter's drive level and pulls back gain when the audio drives the final stage beyond its linear range. Since the audio chain is what sets that drive, you set ALC action by adjusting the microphone or transmit audio gain until the ALC meter just barely flicks into its indicated range on voice peaks. Too much gain produces flat-topping, splatter into adjacent frequencies, and distorted audio, while too little gives weak talk power.
Watch out RF clipping or speech processing changes the average-to-peak ratio of the audio for more punch, but it is a separate control from the gain that sets ALC; the attenuator only affects the receiver front end, and antenna tuning controls match impedance, not drive level.
ALC watches your voice: turn the mic gain up only until ALC just tickles, no more.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
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