Spread spectrum (SS) uses a wide bandwidth which would cause too much crowding on the relatively narrow bands below UHF.

See FCC rules: §97.305 Authorized emission types.

Tip: SS222

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47 CFR 97.107 (a) states that Canadian amateurs are bound by the terms of their Canadian license but may not exceed the privileges given to US Extra-class licensees.

Hint: The answer with Canadian in it

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Older equipment that was produced prior to new regulations and can be used in a legal manner are allowed to be sold by hams. This is how working but older equipment is effectively grandfathered in to current use. Of course good amateur radio practices should be always followed. The below 144 MHz prohibition was a result of unlawful citizen band overpowering.

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Silly memory trick: Canadians are known for saying, “Eh?” So think of the question as, “Line, eh?” 🙂

Real explanation:

Private land mobile radio services, 47 C.F.R. § 90.7 (2010):

Line A. An imaginary line within the U.S., approximately paralleling the U.S.-Canadian border, north of which Commission coordination with the Canadian authorities in the assignment of frequencies is generally required. It begins at Aberdeen, Washington, running by great circle arc to the intersection of 48° N., 120° W., then along parallel 48° N., to the intersection of 95° W., thence by great circle arc through the southernmost point of Duluth, Minnesota, thence by great circle arc to 45° N., 85° W., thence southward along meridian 85° W. to its intersection with parallel 41° N., to its intersection with meridian 82° W., thence by great circle arc through the southernmost point of Bangor, Maine, thence by great circle arc through the southernmost of Searsport, Maine, at which point it terminates.

Private land mobile radio services, 47 C.F.R. § 97.3 (2010):

29. Line A. Begins at Aberdeen, WA, running by great circle arc to the intersection of 48° N, 120° W, thence along parallel 48° N, to the intersection of 95° W, thence by great circle arc through the southernmost point of Duluth, MN, thence by great circle arc to 45° N, 85° W, thence southward along meridian 85° W, to its intersection with parallel 41° N, thence along parallel 41° N, to its intersection with meridian 82° W, thence by great circle arc through the southernmost point of Bangor, ME, thence by great circle arc through the southernmost point of Searsport, ME, at which point it terminates.

reference:

http://www.gpo.gov/fdsys/pkg/CFR-2010-title47-vol5/pdf/CFR-2010-title47-vol5.pdf

page 244, 589

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Line A roughly parallels the border between the Lower 48 States and Canada, about one degree south of the border. Line B is the Canadian counterpart, running about one degree north of the border.

Check out the following for more information: Private land mobile radio services, 47 C.F.R. § 97.303 (2010):

(m) In the 70 cm band:

(1) No amateur station shall transmit from north of Line A in the 420-430 MHz segment. See §97.3(a) for the definition of Line A.

reference:

http://www.gpo.gov/fdsys/pkg/CFR-2010-title47-vol5/pdf/CFR-2010-title47-vol5.pdf

pages 244 and 609

Memory aid: "Stay away from 420 when you're up high." (I know, groan, but you don't forget it.)

Another memory aid: Only those below the line can use the lower end of the 70cm band

TEST TIP: "The southern (low) edge of 70cm is not for those up north."

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Further reading of Special Temporary Authority details:

Special Temporary Authority from the FCC

Accessed 04-Aug-2014

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§97.113 Prohibited transmissions.

(a) No amateur station shall transmit:

(3) Communications in which the station licensee or control operator has a pecuniary interest, including communications on behalf of an employer, with the following exceptions:

(i) A station licensee or station control operator may participate on behalf of an employer in an emergency preparedness or disaster readiness test or drill, limited to the duration and scope of such test or drill, and operational testing immediately prior to such test or drill. Tests or drills that are not government-sponsored are limited to a total time of one hour per week; except that no more than twice in any calendar year, they may be conducted for a period not to exceed 72 hours.

(ii) An amateur operator may notify other amateur operators of the availability for sale or trade of apparatus normally used in an amateur station, provided that such activity is not conducted on a regular basis.

(iii) A control operator may accept compensation as an incident of a teaching position during periods of time when an amateur station is used by that teacher as a part of classroom instruction at an educational institution.

(iv) The control operator of a club station may accept compensation for the periods of time when the station is transmitting telegraphy practice or information bulletins, provided that the station transmits such telegraphy practice and bulletins for at least 40 hours per week; schedules operations on at least six amateur service MF and HF bands using reasonable measures to maximize coverage; where the schedule of normal operating times and frequencies is published at least 30 days in advance of the actual transmissions; and where the control operator does not accept any direct or indirect compensation for any other service as a control operator.

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The answer is:

Communications transmitted for hire or material compensation, except as otherwise provided in the rules

All the other listed types of communications are permitted.

See

http://wireless.fcc.gov/services/index.htm?job=about_1&id=amateur

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Taken directly from the rules:

FCC Part 97.113(a)(4) states that "No amateur station shall transmit ... messages encoded for the purpose of obscuring their meaning."

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All amateurs, except Novices, may put auxiliary stations on the air [97.201(a)].

Note: Since the FCC no longer issues licenses for Novice and Advanced, you might be tempted to select "Any licensed amateur operator" However, there are still individuals who hold Novice and Advanced licenses (the FCC has not forced them to upgrade.), And those who have Novice licenses are not allowed to handle auxiliary stations.

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5 watts to produce full legal output is not correct. The FCC actually maintains a limit of 15dB gain on HF amplifiers as a way of regulating the misuse of Amateur amplifiers which are repurposed for CB. So 5W could only legally be amplified to around ~150W.

External switching really has nothing to do with the question or with amplifier standards.

A gain of 0 is no amplification at all and the question is about amplifiers.

"Satisfying the FCCs spurious emission standards" is correct because the FCC is always concerned with keeping the bands clean and high power amps always create a certain amount of noise (spurious emissions). That is why the FCC publishes spurious emission standards.

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