Exam Prep Jepperdee Technician 2010- Level 2

Serious ‘XM (That’s W2XM) presents

Exam-Prep Jepperdee Tech-exam prep, v. 2

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You MUST use the slide-show mode for the program’s hyperlinks to work properly with MS PwrPt. Operation of the game is almost intuitive, and you can make up your own rules. On the game boards: each numeric point value is a hyperlink which reveals either a question or “Daily Double.” Whenever you get “Daily Double,” click on either word. “SFJ” (semi-final jepperdee) and “FJ” (final jepperdee) are also hyperlinks leading to questions; after selecting SFJ or FJ, click on the screen until it’s obvious what to do. Any question slide or answer slide may give you clickable options at the bottom of the screen. You may take any one of them. On the answer slide, clicking “back” returns you to the game board. For most fun, appropriate hardware (lights, push-buttons, sounder, lockout circuitry) should be used. A diagram is available from the author.

Operating Ur Radio Station Technology

Rules and Regs

Give Me a Number

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500 SFJ

Analog

Modern Radio

Troubleshooting

Antenna Systems

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500 FJ

What agency regulates and enforces the rules for the Amateur Radio Service in the US? T1A02

answer

The FCC

another ?, optional, +/- 50 points

back

What is the Radio Amateur Civil Emergency Service? T2C05

answer

a radio service using amateur stns for emergency management or civil defense communications back

What does it mean when a ham band is said to be available on a secondary basis? T1B08

answer

That amateurs may not cause harmful interference to primary users more info

back

US amateur activity is secondary on the 60m band, on part of the 40m band, and on the 30m band. back

When are you allowed to operate your amateur station in a foreign country? T1C04

hint

answer

FCC rules don’t apply. answer

When the foreign country authorizes it back

What is the only time an amateur station is allowed to transmit music? T1D04

hint (costs 50 points)

answer

This circumstance did not even exist in the 1950’s answer

When incidental to an authorized retransmission of manned spacecraft communications back

Under which type of control may the control op be somewhere other than the control point? T1E06

hint (costs 50 points)

answer

Local control, Automatic control, Remote control, or Indirect control answer

Automatic control back

What’s the approx. change, in decibels (dB), of a power decrease from 12 w to 3 w? T5B10

answer

6 dB

more info

back

The question pool says “6 dB;” some might say “-6 dB.” back

How much power is being used when an applied 13.8 VDC causes a current of 10 A?

T5C09

answer

138 watts

gamble 100 points

back

What is the R of this circuit that draws 10 A with 13.8 volts applied? answer

1.38 ohms

back

What value of resistor has 3 amps flow through it when connected to 90v? T5D04

answer

Be ready to click!

30 ohm BONUS! Any player can try this! 100 points extra credit for correct answer; no penalty for incorrect answer!

Express in kilohm(s). answer

.03 kilohm

back

What is the formula for converting frequency to wavelength? T3B06

answer

Wavelength in meters equals 300 divided by frequency in megahertz OR

(click to advance)

λ(m) = 300 / f(MHz) back

What is the most common repeater freq. offset in the 2 mtr band? T2A01

answer

plus or minus 600 kHz …now click screen for 50point extra-credit question with no penalty for wrong answer

What is the popular offset for the 222-MHz band? answer

5 MHz

back

When is an amateur station required to transmit its assigned call sign? T1F03

answer

At least every 10 minutes during a contact and at the end of the contact FOR BONUS, CLICK HERE. 50 points extra credit for correct answer; no penalty for incorrect answer.

back

Which phonetic alphabet must be used according to FCC rules? answer

There is no particular list specified in the rules. back

What term describes an amateur station that is transmitting and receiving on the same freq? T2B01

answer

Simplex communication Extra Info

Repeater stations use duplex rather than simplex back

What should you do if it is reported that your 2-mtr sigs were strong just a moment ago, but now are weak or distorted? T3A01

answer

Try moving a few feet, as random reflections may be causing multi-path distortion. more info

back

This only works on VHF or UHF where wavelengths are short back

What adjustment would be used to change the voice pitch of a singlesideband signal? T4B06

answer

The RIT or clarifier Gamble 100 points

back

What do the initials “RIT” stand for? answer

Rochester Institute of Technology or Receiver Incremental Tuning back

Where must a filter be installed to reduce harmonic emissions? T4A04

answer

Between the transmitter and the antenna Another wager, this one for 100 points?

back

What is the meaning of “harmonic emissions”? answer

Emissions at frequencies which are integral multiples of the desired frequency back

What term describes the rate at which electrical energy is used? T5A10

answer

Power

Gamble 100 points

back

Given easily measurable quantities, how do you compute power consumed in a resistor? answer

P=

2 IR

or

P = IE back

What type of component is often used as an adjustable volume control? T6A02

answer

Potentiometer

gamble 100 points

back

Describe the symbol for a potentiometer. answer

A zig-zag line with both 1) a terminal at each end and 2) an arrow point (with a terminal) touching a zig or a zag. see symbol

Potentiometer back

How is a semiconductor diode’s cathode lead usually identified?

T6B06

answer

With a stripe

Click to bet 100 points on another question

back

How is a semiconductor diode’s anode lead usually identified? answer .

absence of a marking

back

What component is commonly used to change household 120VAC to a lower AC voltage? T6D06

hint (costs 100 points)

answer

One of these things has a primary winding, a core, and a secondary winding answer

a Transformer

back

What is meant by the term "knife-edge" propagation?

T3C05

hint costs 50 points

answer

A knife is sharp.

answer

Signals are partially refracted around solid objects exhibiting sharp edges

back

Semi-final Jepperdee Topic: Schematic symbols. Your wager? Click here for question.

3 2 1

4

5

What’s item 2? Click here for answer

Transistor

EXTRA credit

to game board 2

For 50 points if you are correct, what kind of transistor (PNP or NPN)? answer

NPN (and it’s a bipolar junction transistor) To second game board

What is the function of a product detector? T7A01

answer

To Detect CW and SSB signals

back

What is the function of a mixer in a superheterodyne receiver? T7A03

answer

to shift the incoming signal to an intermediate frequency more info

back

All signals are converted to the IF. The same circuits filter and optimize them. back

What is the primary advantage of single sideband over FM for voice transmissions? T8A07

answer

SSB signals have narrower bandwidth Click here if you want to gamble 200 points

back

What is an advantage of communicating using FM? answer

FM receivers are insensitive to amplitude variations and atmospheric noise. back

T6C07

2

What is 8?

3

9

5 4 7

1

6

10

8

answer

Light emitting diode

Are you willing to gamble another 400? Yes No

back

T6C06

2

What is 6?

3

9

5 4 7

1

6

10

8

answer

Capacitor

back

What type of modulation is most often used for longdistance voice QSO’s on VHF/UHF bands? T8A03

answer

SSB

back

What does the acronym "BER" mean when applied to digital communications systems? T7B12

answer

Bit Error Rate

Only if you were correct, you may try for 50 more points

back

Give me “BER” using the ITU phonetic alphabet. answer

Bravo Echo Romeo

back

Regarding satellite communications, what is Doppler shift? T8B07

answer

A change in observed freq. caused by relative motion between the satellite and the earth station a familiar example

back

Because of Doppler shift, the apparent frequency of a truck’s horn drops as the truck passes. back

What’s the max power allowed when xmitting telecommand signals to r. c. models? T8C07

hint costs 50 points

answer

It’s quite low

answer

1 watt

back

What emission modes may be used by a Technician Class operator between 219 and 220 MHz? T8D05

hint costs 50 points

answer

There’s only one.

answer

Data

back

How might you obtain a list of active nodes that use VoIP? T8C09

answer

From a repeater directory back

What does an SWR reading of 4:1 mean? T7C06

answer

An impedance mismatch more info

back

An impedance mismatch at a junction causes a signal to be partially reflected. back

What is the characteristic appearance of a "cold" solder joint? T7D09

answer

A grainy or dull surface back

How would you change a dipole antenna to make it resonant on a higher frequency? T9A05

hint

answer

Design lengths of antenna elements are computed to be particular fractions of a wavelength. answer

Shorten it

back

What is the most common cause for failure of coaxial cables? T7C09

answer

Moisture contamination This next one should be easy; ‘Care to gamble 200 points? YES NO

back

Why should the outer jacket of coax cable be resistant to ultraviolet light? T7C10

answer

Ultraviolet light can damage the jacket and allow water to enter the cable. back

What is the commonly accepted value for the lowest voltage that can cause a dangerous electric shock? T0A01

answer

30 volts

Back

What is the impedance of the most commonly used coax cable in typical ham installations? T9B02

answer

50 ohms

Click to gamble 50 points

back

What is the impedance of RG-8 coax? answer

50 ohms

back

What is the approx. length, in inches, of a quarterwavelength vertical ant. for 146 MHz? T9A08

Hint

answer

A λ/4 vertical for the 20-m phone band is slightly less than 200 inches tall answer

19 (inches)

back

T6C11

What’s component 4? 4

2 1

3

answer

Antenna Continue with same player •

x

Same player, no extra credit:

Without component #4, what is this device? 2

1

3

answer

Antenna tuner

back

What is the purpose of a gin pole? T0B05

answer

To lift tower sections or antennas back

“Quad antenna” is found in the glossary (Chapter 10). Describe one. hint Costs 100 points

answer

For one thing, it usually has more than 1 element for enhanced directivity. What’s its shape? answer

Each element is a square loop, λ/4 on a side. Each element is perpendicular to the quad’s boom. back

What reading on an SWR meter indicates a perfect impedance match btwn feedline & antenna? T7C04

hint

answer

It is the ratio of two identical impedance values. answer

1:1 back

What could happen if a person touched your antenna while you were transmitting? T0CO7

answer

He or she might receive a painful RF burn. back

Final Jepperdee Topic: cable characteristics $$

Your wager? click here for question

$$

Give me two reasons for choosing RG-8 over RG-58. answer

At a given frequency, RG-8 has less loss and greater powerhandling capability than RG-58. next

Thanks for playing Exam-prep Jepperdee! Questions, comments, and/or constructive criticism would be appreciated.