Serious ‘XM(That’s W2XM) presents

Exam-Prep JepperdeeTech-exam prep, v. 2

Announcements go here.

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.

Rules and Regs

Give Me a Number

Operating UrStation

Radio Technology

100 100 100 100

200 200 200 200

300 300 300 300

400 400 400 400

500 500 500 500 SFJ

Analog Modern Radio

Trouble-shooting

Antenna Systems

100 100 100 100

200 200 200 200

300 300 300 300

400 400 400 400

500 500 500 500 FJ

T1A02 What agency regulates and en-

forces the rules for the Amateur Radio Service in the US?

answer

The FCC

another ?, optional, +/- 50 points back

T2C05 What is the Radio Amateur Civil

Emergency Service?

answer

a radio service using amateur stns for

emergency manage-ment or civil defense

communications back

T1B08 What does it mean when a ham band is said to be

available on a secondary basis?

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

T1C04 When are you allowed to operate

your amateur station in a foreign country?

hint answer

FCC rules don’t apply.

answer

When the foreign country authorizes

it back

T1D04 What is the only time an amateur station is allowed

to transmit music?

hint (costs 50 points) answer

This circum-stance did not

even exist in the 1950’s

answer

When incidental to an authorized

retransmission of manned spacecraft

communicationsback

T1E06 Under which type of control may the

control op be some-where other than the

control point? hint (costs 50 points) answer

Local control,Automatic control,Remote control, or

Indirect control answer

Automatic control

back

T5B10 What’s the approx. change, in decibels (dB), of a power decrease

from 12 w to 3 w?

answer

6 dB

more info back

The question pool says “6 dB;” some

might say “-6 dB.”

back

T5C09 How much power is being used when an applied 13.8 VDC causes a current of

10 A?

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

T5D04 What value of resistor has 3 amps

flow through it when connected to 90v?

answer

Be ready to click!

30 ohmBONUS! 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

T3B06 What is the formula for

converting frequency to wavelength?

answer

Wavelength in meters equals 300

divided by frequency in megahertz

OR (click to advance)

λ(m) = 300 / f(MHz)

back

T2A01 What is the most common re-peater freq. offset in the 2 mtr band?

answer

plus or minus 600 kHz

…now click screen for 50-point extra-credit question with no penalty for wrong

answer

What is the popular offset for

the 222-MHz band?

answer

5 MHz

back

T1F03 When is an amateur station

required to transmit its assigned call sign?

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 correctanswer; 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

T2B01 What term describes an amateur station that is trans-mitting and receiving

on the same freq? answer

Simplex communication

Extra Info

Repeater stations use duplex rather than

simplex

back

T3A01 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?

answer

more info back

Try moving a few feet, as random

reflections may be causing multi-path

distortion.

back

This only works on VHF or UHF where wavelengths are

short

T4B06 What adjust-ment would be used to change the voice

pitch of a single-sideband signal?

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

T4A04 Where must a filter be installed to

reduce harmonic emissions?

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

frequencyback

T5A10 What term describes the rate at which electrical

energy is used?answer

Power

Gamble 100 points back

Given easily measur-able quantities, how

do you compute power consumed in a

resistor?

answer

P = I2R

or

P = IE

back

T6A02 What type of component is often

used as an adjustable volume control?

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

T6B06 How is a semi-conductor diode’s

cathode lead usually identified?

answer

With a stripe

Click to bet 100 points on another question back

How is a semi-conductor diode’s anode lead usually

identified?answer

.

absence of a marking

back

T6D06 What component is commonly used to

change household 120VAC to a lower

AC voltage?

hint (costs 100 points) answer

One of these things has a primary

winding, a core, and a secondary winding

answer

a Transformer

back

T3C05 What is meant by the term "knife-edge" propagation?

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.

What’s item 2?Click here for answer

12

3

4

5

12

3

4

5

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

T7A01 What is the function of a

product detector?answer

To Detect CW and SSB signals

back

T7A03 What is the function of a mixer in

a superheterodyne receiver?

answer

to shift the incoming signal to an

intermediate frequency

more info back

All signals are con-verted to the IF. The

same circuits filter and optimize them.

back

T8A07 What is the primary advantage of single sideband over

FM for voice transmissions?

answer

SSB signals have narrower bandwidth

Click here if you want to gamble back200 points

What is an advantage of communicating

using FM?

answer

FM receivers are insensitive to

amplitude variations and atmospheric

noise.back

T6C07 What is 8?

answer

1

2 5

4

3

6

7

8

9

101

2 5

4

3

6

7

8

9

10

Light emitting diode

Are you willing to gamble backanother 400? Yes No

T6C06 What is 6?

answer

1

2 5

4

3

6

7

8

9

101

2 5

4

3

6

7

8

9

10

Capacitor

back

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

answer

SSB

back

T7B12 What does the acronym "BER" mean

when applied to digital communi-cations systems?

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

T8B07 Regarding satellite commu-nications, what is

Doppler shift?answer

A change in ob-served 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

T8C07 What’s the max power allowed when

xmitting tele-command signals to

r. c. models? hint costs 50 points answer

It’s quite low

answer

1 watt

back

T8D05 What emission modes may be used by a Technician Class

operator between 219 and 220 MHz?

hint costs 50 points answer

There’s only one.

answer

Data

back

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

answer

From a repeater directory

back

T7C06 What does an SWR reading

of 4:1 mean?

answer

An impedance mismatch

more info back

An impedance mis-match at a junction causes a signal to be partially reflected.

back

T7D09 What is the characteristic

appearance of a "cold" solder joint?

answer

A grainy or dull surface

back

T9A05 How would you change a dipole

antenna to make it resonant on a higher

frequency?hint answer

Design lengths of an-tenna elements are

computed to be par-ticular fractions of a

wavelength.answer

Shorten it

back

T7C09 What is the most common

cause for failure of coaxial cables?

answer

Moisture contamination

This next one should be easy; ‘Care to gamble 200 points?

YES NO back

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

ultraviolet light?answer

Ultraviolet light can damage the jacket and allow water to

enter the cable. back

T0A01 What is the com-monly accepted value for the lowest voltage that can cause a dan-gerous electric shock?

answer

30 volts

Back

T9B02 What is the im-pedance of the most commonly used coax cable in typical ham

installations?answer

50 ohms

Click to gamble50 points back

What is the impedance of RG-8

coax?

answer

50 ohms

back

T9A08 What is the approx. length, in

inches, of a quarter-wavelength vertical ant. for 146 MHz?

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?

answer

1

2

3

4

1

2

3

4

Antenna

Continue with same player

•x

Same player, no extra credit:

Without component #4, what is this device?

answer

1

2

3

4

1

2

3

4

Antenna tuner

back

T0B05 What is the purpose of a gin

pole?answer

To lift tower sections or antennas

back

“Quad antenna” is found in the

glossary (Chapter 10). Describe one.

hintCosts 100 points answer

For one thing, it usu-ally has more than 1

element for en-hanced 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

T7C04 What reading on an SWR meter indi- cates a perfect im-

pedance match btwn feedline & antenna?

hint answer

It is the ratio of two identical

impedance values.

answer

1:1

back

T0CO7 What could happen if a person

touched your antenna while you were transmitting?

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 power-handling capability

than RG-58.next

Thanks for playing Exam-prep Jepperdee!

Questions, comments, and/or constructive criticism

would be appreciated.