The FCC sets maximum transmitting power limits (Peak Envelope Power) for each amateur frequency band. The given frequency of 10.140 MHz (wavelength = 300/10.140 = 29.58 m) falls within the 30 meter band. The maximum transmitting power allowed on this band is 200 watts PEP output.

Refer to FCC Part: [97.313(c)(1)]

Link to ARRL color chart: US Amateur Radio Bands

Link to ARRL text based band table (more accessible): US Amateur Radio Frequency Allocations

Silly Hint: It's 10:00 - do two know where your children are?

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Tags: transmit power 30 meters arrl chapter 3 arrl module 9

The FCC sets maximum transmitting power limits (Peak Envelope Power) for each amateur frequency band. The maximum transmitting power allowed on the 12-meter band is 1500 watts PEP output.

Refer to FCC Part: [97.313(a), (b)]

Link to ARRL color chart: US Amateur Radio Bands

Link to ARRL Vertical chart (2020-01-22): http://www.arrl.org/files/file/Regulatory/Band Chart/Band Chart.pdf

Link to ARRL text-based band table (more accessible): US Amateur Radio Frequency Allocations

Tip: for all commonly used bands (from 160m to 70cm, with exceptions for 60m, 30m, and 1.25m), the maximum transmitting power is 1500 watts PEP

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The 60-meter band is a special case.

Amateur allocation is secondary—the government has first dibs, and amateurs can only use 5 specific frequency channels.

To keep interference to a minimum when using voice modes, amateur radio operators may only use Upper Sideband signals with a maximum bandwidth of 2.8 kHz. (Remember almost 3)

There's also a power restriction (100W PEP).

Refer to FCC Part: [97.303(s)]

Link to ARRL chart: US Amateur Radio Bands

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(A). Strictly speaking, the FCC allows us to use up to a maximum of 1500 watts PEP output on the 14 MHz (20-meter) band. However, we should ALWAYS use only the minimum power necessary to carry out the desired communications. This minimum power use statement is true for using any frequency. We run less risk of causing harmful interference running at only the lowest power necessary rather than blasting the airways with over-powered signals.

Refer to FCC Part: [97.313(a)]

Link to ARRL color chart: US Amateur Radio Bands

Link to ARRL text-based band table (more accessible): US Amateur Radio Frequency Allocations

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Tags: 20 meters transmit power arrl chapter 3 arrl module 9

(C). The FCC sets maximum transmitting power limits (Peak Envelope Power) for each amateur frequency band. We are allowed to use a maximum of 1500 watts PEP output on the 28 MHz (10-meter) band.

Refer to FCC Part: [97.313(b)]

Link to ARRL color chart: US Amateur Radio Bands

Link to ARRL text-based band table (more accessible): US Amateur Radio Frequency Allocations

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Tags: transmit power 10 meter arrl chapter 3 arrl module 9

The FCC sets maximum transmitting power limits (Peak Envelope Power) for each amateur frequency band. We are allowed to use up to a maximum of 1500 watts PEP output on the 1.8 MHz (160-meter) band.

Refer to FCC Part: [97.313(b)]

Link to ARRL color chart US Amateur Radio Bands

Link to ARRL text based band table (more accessible): US Amateur Radio Frequency Allocations

Hint: For 1.8 MHz, the "limit" is the highest or largest wattage of PEP output among the multiple choices.

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Tags: 160 meters transmit power arrl chapter 3 arrl module 9

Radioteletype [RTTY] or data transmissions are limited to a maximum symbol rate of 300 baud on the 20-meter band to limit the amount of bandwidth used. (See the table below).

Note: Shorter wavelengths allow higher baud rates.

Refer to FCC Part: [97.305(c), 97.307(f)(3)]

Table: Maximum RTTY/Data Symbol Rates and Bandwidth

For Use on Amateur Radio Bands

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Tags: digital modes 20 meters arrl chapter 3 arrl module 9

The maximum symbol rate permitted for RTTY or data at frequencies below 28 MHz is 300 baud.

This is somewhat of a trick question. When you see 28MHz (10-meter band) you might be inclined to answer 1200 Baud. However, the question states "BELOW" 28 MHz (160 meters to 12 meters). so the correct answer is 300 baud.

Radioteletype (RTTY) and data transmissions are limited in their maximum permitted symbol rate to control the amount of bandwidth used. Frequencies below 28 MHz (below the 10 meter band = 12 meters to 160 meters) are restricted to using a maximum symbol rate of 300 baud. (See the table below)

Note: Shorter wavelengths are allowed greater baud rates.

Refer to FCC Part: [97.305(c)] and [97.307(f)(3)] Table: Maximum RTTY/Data Symbol Rates and Bandwidth

For Use on Amateur Radio Bands

To help recognize them: it seems four options will always be 300/1200/19.6k/56k, so we just need to correspond them to the range of wavelength in order: 15m/10m/5m/1m -- multiples of 5.

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Tags: digital modes 10 meter arrl chapter 3 arrl module 9

Radioteletype (RTTY) and data transmissions are limited to a maximum symbol rate (baud) so that they do not use up too much bandwidth. The lower the frequency, the lower the allowed baud rate.

The 1.25 m and 70 cm bands are limited to 56,000 baud (56 kilobaud). The frequencies above the 70 cm band have no limit at all.

To help remember this, notice that 1.25 m and 70 cm are close to 1 meter, and note that the 56 kilobaud is the highest rate limit provided in the options (one => top).

Refer to FCC Part: [97.305(c) and 97.307(f)(4)]

Table: Maximum RTTY/Data Symbol Rates and Bandwidth

For Use on Amateur Radio Bands

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Radioteletype [RTTY] and data transmissions are limited to a maximum symbol rate (baud) so that they do not use up too much bandwidth. The lower the frequency, the lower the allowed baud rate.

For the exam note that the 10 meter band has an allowed maximum baud rate of 1200.

If you need a mnemonic, try 10 m => about 1000 baud.

Refer to FCC Part: [97.305(c) and 97.307(f)(4)]

Table: Maximum RTTY/Data Symbol Rates and Bandwidth

For Use on Amateur Radio Bands

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Tags: digital modes 10 meter arrl chapter 3 arrl module 9

Radioteletype (RTTY) and data transmissions are limited to a maximum symbol rate (baud) so that they do not use up too much bandwidth. The lower the frequency, the lower the allowed baud rate.

The exam always shows the same options for the maximum symbol rate questions:

• 300 baud (longer than 10 m)
• 1200 baud (10 m)
• 19.6 kilobaud (6 m, 2 m)
• 56 kilobaud (1.25 m, 70 cm)

If you need a mnemonic, try 2 m => almost 20 kilobaud.

Refer to FCC Part: [97.305(c) and 97.307(f)(5)] Table: Maximum RTTY/Data Symbol Rates and Bandwidth

For Use on Amateur Radio Bands

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Tags: digital modes 2 meter arrl chapter 3 arrl module 9

The 60-meter band is a unique band that amateur stations may use. The amateur radio service is secondary to the government when using this band and we are restricted to using 5 specific channels for only upper sideband voice communications. The power and bandwidth on this frequency range is also tightly specified. Because of the exact nature of operations on this band and to avoid interference with government communications, the FCC requires that if you are using anything other than a dipole antenna, you must keep a record of the gain of your antenna. This is to demonstrate that you are not using too much output power while operating on this frequency.

Refer to FCC Part: [97.303(s)]

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Tags: 60 meters rules and regulations operating rules arrl module 4 arrl chapter 2

Rules about digital modes are found in 47 C.F.R 97.309, subpart (a)(4) allows any mode that is publicly documented, so an experimental or rule-making petition would not be required.

FCC Type Certification does not cover digital modes on Amateur Radio.

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ERP = “Effective Radiated Power”

47 CFR 97.313 covers power limits across bands, part i regulates the power on the 60-meter band.

Subsection I provides a presumption of a half-wave dipole antenna with a maximum ERP of 100 watts PEP.

Important to note on the 60-meter band: if you are operating with an antenna with gain above a half-wave dipole, you must retain documentation showing the gain and/or calculations to ensure you do not exceed the 100 watt PEP ERP limit.

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Peak Envelope Power (PEP)

This is the highest power level emitted at the output of a transmitter regardless of modulation and other variables.

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