General Course, Module 9: HF Operating

9.1Phone, and the Sideband Custom

Single sideband is the voice of HF: the most common HF voice mode, chosen for its advantages of less bandwidth and greater power efficiency, and defined precisely as one sideband transmitted with the other sideband and the carrier suppressed. All of that carries forward from Modules 5 and 6; what is new is the custom of which sideband, and the exam asks it four ways:

• 160, 75, and 40 meters: lower sideband.
• 20 meters and above (14 MHz and up), including 17 and 12 meters: upper sideband.
• VHF and UHF SSB: upper sideband.

Why LSB down low? Not physics, and not law: it is commonly accepted amateur practice, a custom old enough to have outlived its original technical reason. The dividing line to memorize: below 10 MHz think LSB, above think USB. (The 60-meter band, always the exception, is USB by rule, not custom.)

Operating customs of the phone bands:

• Breaking into an ongoing contact: say your call sign once, in a pause. Not "break break," not a long preamble. One call sign; the stations in the contact will bring you in.
• "CQ DX" from a station in the lower 48 means the caller wants distance: stations outside the contiguous 48 states should respond. Answering a CQ DX from the next state over is a custom violation the band will remember.
• VOX versus PTT: voice-operated transmit exists for one advantage, hands-free operation, keying the transmitter when you speak. Loggers and contesters love it; open-mic accidents are its tax.

And the transmit-audio discipline from Module 8 gets restated as the operating habit it is: proper ALC is set by adjusting the transmit audio or microphone gain, the last thing to check before your first CQ of the evening.

9.2Sharing the Band Like You Own It Together

The legal foundation first, because every courtesy stands on it: except during emergencies, no amateur station has priority access to any frequency. Not nets, not schedules, not contests, not the group that has met on 7.272 since 1974. From that one rule, the customs follow:

• Before calling CQ, verify the frequency is clear: on CW send "QRL?" followed by your call; on phone, ask "is this frequency in use?" followed by your call. Silence is not consent; ask.
• When propagation shifts mid-contact and another conversation fades in on top of yours, nobody is the villain: attempt to resolve the interference in a mutually acceptable manner. The Technician course's negotiate rule, now with ionospheric humility attached.
• Spacing is courtesy in hertz: keep 150 to 500 Hz from adjacent CW signals, 2 to 3 kHz from adjacent SSB signals. Module 6's bandwidths, applied as manners.
• Choosing where to operate at all: follow the voluntary band plan, the same voluntary structure Module 1 defined. One band-plan specific the exam checks: the 50.1 to 50.125 MHz window on 6 meters is reserved by custom for contacts with stations outside the contiguous 48 states, a DX window kept clear so weak intercontinental signals are not buried by locals.

Emergencies invert everything. If a station in distress breaks into your contact, the first action is to acknowledge the station in distress and determine what assistance may be needed. Not to clear off, not to relay to someone else first: answer them.

The organized version of readiness carries two RACES facts forward from Technician: the control operator of a RACES station must hold an FCC-issued amateur license (civil defense enrollment is the RACES membership requirement, but the control operator must still be a licensed ham), and routine RACES drills are limited to one hour per week. Plus one net-management practice with wide application: have a backup frequency planned for interference or poor conditions, because Murphy checks into every net.

9.3The Key: CW Procedures and the Q Code

Ray unplugs the microphone and slides a paddle in front of you. "Slowest conversation on the band, and the one you will end up proudest of."

The Q signals are CW's compressed vocabulary, and five are on the exam:

• QRL? "Are you busy? Is this frequency in use?" (Section 9.2's door knock.)
• QRS "Send slower." The kindest three letters a new CW operator will ever receive.
• QRN "I am troubled by static." Module 2's summer atmospheric noise, reported in three letters.
• QRV "I am ready to receive."
• QSL "I have received and understood." The same QSL that names the postcards.

The prosigns are punctuation:

• KN at the end of a transmission: listening only for a specific station. The closed-door version of K.
• AR: end of a formal message, the radiogram's period.

Operating craft, each one a mercy in practice:

• Answer a CQ no faster than the CQ was sent. The calling operator showed you their comfortable speed; matching it is both courtesy and self-preservation.
• Zero beat the station: match your transmit frequency to the received signal's frequency, so the contact happens on one frequency instead of two. Modern rigs have a button for it; ears learned it first.
• A "C" appended to an RST report means a chirpy or unstable signal, the report that politely says your oscillator moves when you key it.
• Full break-in, QSK: the transmitting station can hear between code characters and elements. With QSK, the other operator can interrupt you mid-word, which turns CW from alternating monologues into actual conversation. It is the mode's best feature and its best-kept secret.

9.4The Long Path, the Log, and the Monitors

This group is the HF operator's toolkit of habits, plus the hobby's self-policing.

The Volunteer Monitor Program: amateur volunteers formally enlisted to monitor the airwaves for rules violations, with the objective of encouraging amateurs to self-regulate and comply with the rules. Their working method for a classic problem, a stuck carrier holding a repeater open: participating monitors compare beam headings from their home locations, triangulating the offender with Module 7's directional antennas. Amateur radio polices itself the same way it does everything else: with antennas and cooperation.

Navigation for the HF operator:

• An azimuthal projection map shows true bearings and distances from a specific location, your QTH at the center of a compass rose covering the planet. It is how you learn that from most of the US, the beam heading for southern Asia is roughly north.
• Long path, from Module 2, now as an operating move: point the beam 180 degrees from the short-path heading and work the station the long way around when the short way is closed.

Habits of the good operator:

• Calling CQ on HF phone follows the same skeleton as Technician simplex: repeat CQ a few times, "this is," your call a few times, pause, listen, repeat.
• Exchange signal reports early in a contact so each station can operate according to conditions: slow down, repeat, or relax based on what the other end actually copies.
• Use the NATO phonetic alphabet (Alpha, Bravo, Charlie, Delta), the Technician standard now doing daily HF duty.
• Keep a log. Not because the FCC requires one (it does not, for ordinary operation), but because a log helps you reply if the FCC requests information about your station, and because your award and QSL life runs on it.
• Contest identification carries no exemptions: identify per normal FCC regulations, exchange or no exchange.
• And learn one term of art: QRP is low-power operation, typically 5 watts or less, the discipline that turns Module 8's S-meter math into sport. Two S units below the 100-watt crowd, and still working the world.

9.5Digital Operating, Done Correctly

The digital modes from Module 6 come with procedures of their own, and the machine modes are surprisingly opinionated.

Where and how: most 20-meter digital activity lives between 14.070 and 14.100 MHz, with FT8 specifically at 14.074 to 14.077 MHz. When transmitting digital modes by AFSK through an SSB radio, the sideband conventions split by history: RTTY uses LSB (a teleprinter tradition), while FT8, FT4, JT65, and JT9 use USB. RTTY's other vital statistic: the most common HF frequency shift is 170 Hz between mark and space.

FT8 has house rules:

• Your computer clock must be accurate to within approximately 1 second, because the mode lives and dies by its 15-second time slots. (Chronic failure to decode anyone? Check the clock first.)
• Answering a CQ correctly: find a clear frequency in the alternate time slot to the caller. They transmit on odd slots, you answer on even, and the whole waterfall interleaves like traffic taking turns.

Winlink, the radio email system from the Technician course, now with its General-class specifics: Winlink is an amateur wireless network for internet email, a form of packet radio, operating on both VHF and HF. All of these. Its infrastructure station, the Remote Message Server, goes by a name you already know: a gateway. Its modern HF transport protocol is VARA, and establishing contact with any digital gateway works the same way: transmit a connect message on the station's published frequency.

Connection-mode etiquette and troubleshooting:

• PACTOR contacts cannot be joined: the protocol links exactly two stations. There is no three-way; wait your turn.
• Interference to a PACTOR or VARA link produces frequent retries or timeouts, long pauses, or failure to connect. All of these, the ARQ machinery from Module 6 audibly struggling.
• An RTTY signal that looks right but will not decode: mark and space reversed, wrong baud rate, or wrong sideband. All of these. Three switches, flip them in order.

One network closes the course's digital thread: AREDN, the Amateur Radio Emergency Data Network, whose primary purpose is providing high-speed data services during an emergency or community event. The mesh networks Technician Module 6 introduced, grown into deployable emergency infrastructure, and a preview of where your public-service story can go.