Coming from the prefix "tele" (distant) and the suffix "metry" meaning "the process, art, or science of measuring", telemetry is no more than simply "distance measurements".

Hint: a meter is a unit of measurement

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§97.113 Prohibited transmissions.

(a) No amateur station shall transmit: ... (4) Music using a phone emission except as specifically provided elsewhere in this section; communications intended to facilitate a criminal act; messages encoded for the purpose of obscuring their meaning, except as otherwise provided herein; obscene or indecent words or language; or false or deceptive messages, signals or identification.

§97.211(b) A telecommand station may transmit special codes intended to obscure the meaning of telecommand messages to the station in space operation.

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FCC 97.3(a)(44) Telecommand station. An amateur station that transmits communications to initiate, modify or terminate functions of a space station.

Tip - The only answer that contains the words “space station”

Tip2 - A “telecommand” station must be making commands. The correct answer is the one that includes a list of potential commands, “initiate, modify or terminate”.

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There are no specific requirements for a balloon beyond those for any aircraft. Therefore like any amateur station, the balloon-borne station must identify with its call sign.

Hint: since a balloon is intended to move (if it were tethered, it would be an aerostat), it doesn't have a unique Maidenhead grid locator. Therefore, it's not reasonable for all choices to be correct. The call sign is always required, so it can't be the wrong answer. Therefore it must be the unique right answer.

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§97.213 Telecommand of an amateur station.

(d) A photocopy of the station license and a label with the name, address, and telephone number of the station licensee and at least one designated control operator is posted in a conspicuous place at the station location.

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§97.215 Telecommand of model craft.

(c) The transmitter power must not exceed 1 W.

Hint: model craft are nearby and usually line-of-sight, so only low power is needed.

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The correct answer is ALL HF bands 40 Meters and above EXCEPT for 30 meters.

From §97.207-

(c) The following frequency bands and segments are authorized to space stations:

(1) The 17 m, 15 m, 12 m, and 10 m bands, 6 mm, 4 mm, 2 mm and 1 mm bands; and

(2) The 7.0-7.1 MHz, 14.00-14.25 MHz, 144-146 MHz, 435-438 MHz, 2400-2450 MHz, 3.40-3.41 GHz, 5.83-5.85 GHz, 10.45-10.50 GHz, and 24.00-24.05 GHz segments.

Since this question specifically mentions HF amateur bands, this limits our options to those between 3 Mhz and 30 Mhz. In the list given by the FCC regulations, that translates to parts of 40 m Band, (7.0-7.1 MHz), parts of the 20 m band (14.00-14.25 MHz) and the 17 m, 15 m, 12 m, and 10 m bands. This is another way in which the 30 meter band is an odd HF band. In addition to prohibiting space stations, the 30 meter band has a lower than standard power limit of only 200 PEP and it generally only allows narrow-band digital modes and CW.

An easy way to remember this one is that every year has 12 months (12m band) but every month doesn't have 30 days. There is only one answer that has 12m without 30m - OR - There's always 4 even and 2 odd balls in space. 4 even numbered bands and two odd numbered bands. - KF4IRE

The only answer with 10, 12, 17 meters

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From Part 97.207 Space Station::

(c) The following frequency bands and segments are authorized to space stations:

...

(2) The 7.0-7.1 MHz, 14.00-14.25 MHz, 144-146 MHz, 435-438 MHz, 1260-1270 MHz, and 2400-2450 MHz, 3.40-3.41 GHz, 5.83-5.85 GHz, 10.45-10.50 GHz, and 24.00-24.05 GHz segments.

144-146 MHz covers a portion of the 2 meter band.

For your general education, note that the following spectrum is also authorized to space stations:

(1) The 17 m, 15 m, 12 m, and 10 m bands, 6 mm, 4 mm, 2 mm and 1 mm bands;

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Part 97 : Sec. 97.207 Space station

Part 97 Sec. 97.207 Space station (c) The following frequency bands and segments are authorized to space stations:

(1) The 17 m, 15 m, 12 m, and 10 m bands, 6 mm, 4 mm, 2 mm, and 1 mm bands; and

(2) The 7.0–7.1 MHz, 14.00–14.25 MHz, 144–146 MHz, 435–438 MHz (70 cm) , 2400–2450 MHz (13 cm), 3.40–3.41 GHz, 5.83–5.85 GHz, 10.45–10.50 GHz, and 24.00–24.05 GHz segments.

Silly memory tool: In 1970 (70cm) Apollo 13 (13cm) had a problem.

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§97.211 Space telecommand station.

(a) Any amateur station designated by the licensee of a space station is eligible to transmit as a telecommand station for that space station, subject to the privileges of the class of operator license held by the control operator.

Memory aid: Both the question and the correct answer have "space station" in them. "Any amateur station so designated by the space station licensee"

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FCC 97.209(a) Any amateur station may be an Earth station. A holder of any class operator license may be the control operator of an Earth station, subject to the privileges of the class of operator license held by the control operator.

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Memory tip: There is only one answer with the word "beacon." Think of a lighthouse beacon: it can send a signal only one way ("Danger! Shallow water!").

97.211 Space telecommand station. ... (d) A telecommand station may transmit one-way communications.

97.201 Auxiliary station. ... (e) An auxiliary station may transmit one-way communications.

97.203 Beacon station. ... (g) A beacon may transmit one-way communications.

97.207 Space station. ... (e) A space station may transmit one-way communications.

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