Technician Class Series – Tech Frequencies

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Hello everybody and welcome back to my blog! Today we are going to continue our series on the Technician Class License Question Pool! Today we will be talking about Technician Frequencies.

As always, the correct answers will be in bold. I also recommend that you only read the correct answers when studying for your test. If you do this, when you take your test and you see a question, there will be a better chance that the correct answer will jump out at you easier. Some say that this approach is kind of like cheating, but the way that I see it, you will always be learning something in this hobby and you don’t have to know everything there is to know about the hobby to get your license.

If you would like to purchase a copy of the Technician Class study book that this series is:

Let’s move on to the good  stuff, shall we?


 

T5C06 What does the abbreviation “RF” refer to?

A. Radio frequency signals of all types

B. The resonant frequency of a tuned circuit

C. The real frequency transmitted as opposed to the apparent frequency

D. Reflective force in antenna transmission lines

 

T3A07 What type of wave carries radio signals between transmitting and receiving stations?

A. Electromagnetic

B. Electrostatic

C. Surface acoustic

D. Magnetostrictive

Radio waves contain both electrical and magnetic energy, hence they are called Electromagnetic

 

T3B03 What are the two components of a radio wave?

A. AC and DC

B. Voltage and current

C. Electric and magnetic fields

D. Ionizing and non-ionizing radiation

 

T3B04 How fast does a radio wave travel through free space?

A. At the speed of light

B. At the speed of sound

C. Its speed is inversely proportional to its wavelength

D. Its speed increases as the frequency increases

The speed of a radio wave is constant; The distance traveled is what varies with frequency, so that knocks out (C) and (D). That leaves us with the speed of light and sound. If the question was asking about how fast the sound coming out of a speaker travels then it would be the speed of sound, however, because the question asked about a radio wave that changes things. Radio waves, as the two previous questions covered, are Electromagnetic waves, therefore the wave travels at the speed of light.

T3B11 What is the approximate velocity of a radio wave as it travels through free space?

A. 3000 kilometers per second

B. 300,000,000 meters per second

C. 300,000 miles per hour

D. 186,000 miles per hour

Since radio waves travel at the speed of light, 300,000,000 meters per second is the correct answer.

 

T5A12 What term describes the number of times per second that an alternating current reverses direction?

A. Pulse rate

B. Speed

C. Wavelength

D. Frequency

An easy was to remember this is it is asking how frequently is the alternating current reversing directions…

 

T5C05 What is the unit of frequency?

A. Hertz

B. Henry

C. Farad

D. Tesla

The basic unit of frequency is the hertz, abbreviated Hz, notice the capital H.

 

T5B07 If a frequency readout calibrated in megahertz shows a reading of 3.525 MHz, what would it show if it were calibrated in kilohertz?

A. 0.003525 kHz

B. 35.25 kHz

C. 3525 kHz

D. 3,525,000 kHz

The one beauty of the metric system is how easy it is to convert from one thing to another. There is 1,000 kHz in a MHz. So all you have to do is move the decimal place to the right 3 times to get the kHz.

Metric System Scale - Frequencies

T3B01 What is the name for the distance a radio wave travels during one complete cycle?

A. Wave speed

B. Waveform

C. Wavelength

D. Wave spread

Radio Wave - Frequencies

The key word in this question is distance. In all the possible answers the only one that is a synonym of distance is length.

 

T3B07 What property of radio waves is often used to identify the different frequency bands?

A. The approximate wavelength

B. The magnetic intensity of waves

C. The time it takes for waves to travel one mile

D. The voltage standing wave ratio of waves

Anytime that we talk about the band that we want to talk on we say something like, “I was talking on 20 meters the other night” or “Let’s switch over to the 2 meter repeater”. Some of these possible answers are just so far out there that I think to myself, “Really?!”

 

T3B05 How does the wavelength of a radio wave relate to its frequency?

A. The wavelength gets longer as the frequency increases

B. The wavelength gets shorter as the frequency increases

C. There is no relationship between wavelength and frequency

D. The wavelength depends on the bandwidth of the signal

In a previous post on my blog we talked extensively about this, Frequencies and the Spectrum. The higher the frequency the shorter the distance of the waves and visa versa.

 

T3B06 What is the formula for converting frequency to approximate wavelength in meters?

A. Wavelength in meters equals frequency in hertz multiplied by 300

B. Wavelength in meters equals frequency in hertz divided by 300

C. Wavelength in meters equals frequency in megahertz divided by 300

D. Wavelength in meters equals 300 divided by frequency in megahertz

The formula for this is:

Frequency = 300 divided by Wavelength in meters

If you remember two this for figuring this out, remember 300 and divided by whatever.

 

Use this chart to help you figure out the answers to the next few questions:

FrequencySpectrum - Frequencies

T3B10 What frequency range is referred to as HF?

A. 300 to 3000 MHz

B. 30 to 300 MHz

C. 3 to 30 MHz

D. 300 to 3000 kHz

If you remember what HF(High Frequency), VHF(Very-High Frequency) and UHF(Ultra-High Frequency) stands for then you can probably take a guess at this one and the next two questions. Also remember that all(I believe) of the frequencies as a ham we use are in the MHz ranges. So remember 3, 30, 300, and 3000 and you can probably figure these questions out.

T3B08 What are the frequency limits of the VHF spectrum?

A. 30 to 300 kHz

B. 30 to 300 MHz

C. 300 to 3000 kHz

D. 300 to 3000 MHz

 

T3B09 What are the frequency limits of the UHF spectrum?

A. 30 to 300 kHz

B. 30 to 300 MHz

C. 300 to 3000 kHz

D. 300 to 3000 MHz

 

T1B03 [97.301(a)] Which frequency is within the 6 meter band?

A. 49.00 MHz

B. 52.525 MHz

C. 28.50 MHz

D. 222.15 MHz

If you use the formula we talked about a few questions back, you can figure this out pretty easy.

Frequency = 300 / Wavelength(in meters)

Frequency = 300 / 6 (meters)

Frequency = 50 MHz

That leaves you with two possibilities (A) and (B). If you remember that the 6M band runs from 50-54MHz then you will have your answer

T1B04 [97.301(a)]Which amateur band are you using when your station is transmitting on 146.52 MHz?

A. 2 meter band

B. 20 meter band

C. 14 meter band

D. 6 meter band

This is the same thing as the last question, except this time you are solving for Wavelength instead of frequency

Wavelength = 300 / Frequency

Wavelength = 300 / 146.52

Wavelength = 2.047502

Therefore your answer is the 2 meter band

 

T1B10 [97.301(e), 97.305(c)] Which of the bands above 30 MHz that are available to Technician Class operators have mode-restricted sub-bands?

A. The 6 meter, 2 meter, and 70 cm bands

B. The 2 meter and 13 cm bands

C. The 6 meter, 2 meter, and 1.25 meter bands

D. The 2 meter and 70 cm bands

This question and the next question you are pretty much going to have to just remember because each band has some part of the band where handheld, base and mobile FM is discourgaged

T1B11 [97.301(a), 97.305 (a)(c)] What emission modes are permitted in the mode-restricted sub-bands at 50.0 to 50.1 MHz and 144.0 to 144.1 MHz?

A. CW only

B. CW and RTTY

C. SSB only

D. CW and SSB

 

T1B07 [97.301(a)] What amateur band are you using if you are transmitting on 223.50 MHz?

A. 15 meter band

B. 10 meter band

C. 2 meter band

D. 1.25 meter band

Use your formula here again:

Wavelength = 300 / 223.50

Wavelength = 1.34228

The closest option will be the 1.25 meter band.

 

T1B13 [97.305(c)] Which emission may be used between 219 and 220 MHz?

A. Spread spectrum

B. Data

C. SSB voice

D. Fast-scan television

 

T1B05 [97.301(a)] Which 70 cm frequency is authorized to a Technician Class license holder operating in ITU Region 2?

A. 53.350 MHz

B. 146.520 MHz

C. 443.350 MHz

D. 222.520 MHz

Use your formula here again:

Wavelength = 300 / .7(meters)

Wavelength = 428.571

The closest answer will be C

 

T2A02 What is the national calling frequency for FM simplex operations in the 70 cm band?

A. 146.520 MHz

B. 145.000 MHz

C. 432.100 MHz

D. 446.000 MHz

Since we are talking about the 70cm band, we know that it will not be (A) or (B) because those frequencies are in the 2 meter band. (C) is in the CW is used for CW and SSB. So if you remember 446, you will always know where to supposedly be able to find a contact. In the real world though, you will have better luck looking for a local repeater to find someone to talk to.

 

T1B06 [97.301(a)] Which 23 cm frequency is authorized to a Technician Class licensee?

A. 2315 MHz

B. 1296 MHz

C. 3390 MHz

D. 146.52 MHz

Here is another formula problem…Wavelength comes to 1304.3478…so closest is B.

 

T1A14 [97.303(d)] What must you do if you are operating on the 23 cm band and learn that you are interfering with a radiolocation station outside the United States?

A. Stop operating or take steps to eliminate the harmful interference

B. Nothing, because this band is allocated exclusively to the amateur service

C. Establish contact with the radiolocation station and ask them to change frequency

D. Change to CW mode, because this would not likely cause interference

As amateur radio operators, the first and foremost thing that we need to remember to not do is to cause interference with anyone. Whether it be with a air traffic controller to our neighbor’s TV. Even though the neighbors TV side of things is more than likely something on their end rather than yours, they are your neighbors and I, personally, like to keep at least a civil relationship with my neighbors. You never know when you house might burn down or someone rob it and your neighbors be the ones that call 911. So go over and help fix the problem with your neighbor. So, to sum up, we don’t want to cause interference so stop immediately and we want to fix the problem so it doesn’t keep happening.

 

T2A10 What is a band plan, beyond the privileges established by the FCC?

A. A voluntary guideline for using different modes or activities within an amateur band

B. A mandated list of operating schedules

C. A list of scheduled net frequencies

D. A plan devised by a club to indicate frequency band usage

The way that each band is broke up is done on a voluntary basis. They are guidelines to help keep everyone on the same page so to speak. If you would like to get a free band plan chart visit, http://www.w5yi.org/page.php?id=18

 

T1B08 [97.303] Which of the following is a result of the fact that the amateur service is secondary in some portions of the 70 cm band?

A. U.S. amateurs may find non-amateur stations in the bands, and must avoid interfering with them

B. U.S. amateurs must give foreign amateur stations priority in those portions

C. International communications are not permitted on 70 cm

D. Digital transmissions are not permitted on 70 cm

There are some bands that amateur radio operators are allowed to use where we are not the primary users of those bands. One of those bands is the 70 cm band. On the 70 cm band we share it with the Air Force radio navigation service. That could and probably would be a very bad thing if you caused interference with that.

 

T1B09 [97.101(a), 97.301(a-e)] Why should you not set your transmit frequency to be exactly at the edge of an amateur band or sub-band?

A. To allow for calibration error in the transmitter frequency display

B. So that modulation sidebands do not extend beyond the band edge

C. To allow for transmitter frequency drift

D. All of these choices are correct

 300px-Am-sidebands - Frequencies

fc = Frequency Carrier
fm = Frequency Modulation

This is what the your transmission basically looks like when you press the PTT. The frequency that you have your radio set to is the Carrier frequency but you can have a bandwidth of up to 15 kHz(I believe, depending on what mode you are talking on), 7.5kHz on either side. So if you set your radio to the bottom or top of the band, half of your transmission will be going out on frequencies that we, as hams, are not allowed to talk on. The other two options are correct to because your radio might be a little off from the manufacture or may “drift” from what you read out says.


That wraps it up for this post. If you like what you are reading or you have a question, please leave me a comments down below. I would like to thank everybody for reading my posts. I would like to ask that you have patients with me in the coming weeks until I can get a new web host. My current host only allows for 250 mbs for 24 hour period, so if you see my page give you a 503 Service Temporarily Unavailable, please come back later and try again. I hope to have a new host soon!

If you have not done so already, please subscribe to my blog either by email or by RSS feed, like me on Facebook and follow me on Twitter, Google+ and LinkedIn. Links to all of these can be found in the bar on the right. Next Sunday we will be talking about “Your First Radio” so please come back and check it out next Sunday. I will be having posts between now and then as well.

Until next time

73 de Curtis, K5CLM

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