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Technician Licensing Class

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Picture This!

Page 141 to 150

ELEMENT 2 SUB-ELEMENTS (Groupings)

About Ham Radio

Call Signs

Control

Mind the Rules

Tech Frequencies

Your First Radio

Going On The Air!

Repeaters

Emergency!

Weak Signal Propagation

2

ELEMENT 2 SUB-ELEMENTS (Groupings)

Talk to Outer Space!

Your Computer Goes Ham Digital!

Multi-Mode Radio Excitement

Run Some Interference Protection

Electrons – Go With the Flow!

It’s the Law, per Mr. Ohm!

Picture This!

Antennas

Feed Me with Some Good Coax!

Safety First!

3

Picture This!

Valid July 1, 2010

Through

June 30, 2014

- Electrical depictions
- Grey sketch
- Schematic symbols
- Component callouts

- Electrical components
- Logic states
- Digital codes
- Traffic nodes

CAPACITOR

RESISTOR

TRANSISTOR

DIODE

LED

BATTERY

ANTENNA

- Wire lengths
- Physical appearance of components
- The way components are interconnected
- All of these choices

20m CW Transmitter by ON6MU

- Connector
- Meter
- Variable capacitor
- Variable inductor

“coil”

- Antenna
- Transmitter
- Dummy load
- Ground

- Resistor
- Zener diode
- Potentiometer
- Capacitor

Tank Circuit Schematic

VariableCapacitors

Inductor

Tank Circuit or Tuned Circuit

- Resistor
- Transistor
- Battery
- connector

Resistors “slow down” the current. See that effect in the symbol?

- Resistor
- Transistor
- Indicator lamp
- Connector

Transistors have Three wires.

- Give off light when current flows through it
- Supply electrical energy
- Control the flow of current
- Convert electrical energy into radio waves

- Resistor
- Transistor
- Lamp
- Ground symbol

- Resistor
- Transistor
- Battery
- Ground symbol

- Single-pole single-throw
- Single-pole double-throw
- Double-pole single-throw
- Double-pole double-throw

- Variable inductor
- Double-pole switch
- Potentiometer
- Transformer

- Resistor
- Capacitor
- Regulator IC
- Transistor

- Resistor
- Inductor
- Regulator IC
- Light emitting diode

L

E

D

- Variable capacitor
- Variable inductor
- Variable resistor
- Variable transformer

- Potentiometer
- Transistor
- Meter
- Relay

- A switch controlled by an electromagnet
- A current controlled amplifier
- An optical sensor
- A pass transistor

- 2 dB
- 3 dB
- 5 dB
- 10 dB

dB Change

2x

4x

8x

10x

100x

1000x

10,000x

3 dB

6 dB

9 dB

10 dB

20 dB

30 dB

40 dB

- 3 dB gain = a factor of 2.
- “twice as much” is +3 db
- “half as much” is –3 db

- 1 dB
- 3 dB
- 6 dB
- 9 dB

dB Change

2x

4x

8x

10x

100x

1000x

10,000x

3 dB

6 dB

9 dB

10 dB

20 dB

30 dB

40 dB

From 12 to 3 is ¼ ½ × ½ = ¼-–3 db +–3 db =–6 db

- 3 dB gain = a factor of 2.
- “twice as much” is +3 db
- “half as much” is – 3 db

- 10 dB
- 12 dB
- 18 dB
- 28 dB

dB Change

2x

4x

8x

10x

100x

1000x

10,000x

3 dB

6 dB

9 dB

10 dB

20 dB

30 dB

40 dB

From 20 to 200 is 10x 10 db

- 3 dB gain = a factor of 2.
- “twice as much” is +3 db
- “half as much” is –3 db
- “10 times” is +10 db

- Regulator
- Oscillator
- Filter
- Phase inverter

Voltage Regulator

- Variable capacitor
- Transformer
- Transistor
- Diode

Voltage Transformer

- Transducer
- Multi-pole relay
- Integrated circuit
- Transformer

I

C

Integrated Circuit Chips

- Low Emission Diode
- Light Emitting Diode
- Liquid Emission Detector
- Long Echo Delay

- LED
- FET
- Zener diode
- Bipolar transistor

- 1500 kHz
- 1500 MHz
- 15 GHz
- 15 kHz

1500 kilo = 1500 x1000 = 1,500,000

- Metric Exponent English
- Tera-1012Trillion
- Giga-109Billion
- Mega-106Million
- Kilo-103Thousand
- Centi10-2Hundredth
- Milli-10-3Thousandth
- Micro-10-6Millionth
- Nano-10-9Billionth
- Pico-10-12Trillionth

- One one-thousandth of a volt
- One hundred volts
- One thousand volts
- One million volts

1 kilo = 1 x1000 = 1,000

- Metric Exponent English
- Tera-1012Trillion
- Giga-109Billion
- Mega-106Million
- Kilo-103Thousand
- Centi10-2Hundredth
- Milli-10-3Thousandth
- Micro-10-6Millionth
- Nano-10-9Billionth
- Pico-10-12Trillionth

- 0.003 amperes
- 0.3 amperes
- 3 amperes
- 3,000,000 amperes

1

3000 milli- = 3000 x= 3

1000

- Metric Exponent English
- Tera-1012Trillion
- Giga-109Billion
- Mega-106Million
- Kilo-103Thousand
- Centi10-2Hundredth
- Milli-10-3Thousandth
- Micro-10-6Millionth
- Nano-10-9Billionth
- Pico-10-12Trillionth

- 0.02 watts
- 0.5 watts
- 5 watts
- 50 watts

1

500 milli- = 500 x= 0.5

1000

- Metric Exponent English
- Tera-1012Trillion
- Giga-109Billion
- Mega-106Million
- Kilo-103Thousand
- Centi10-2Hundredth
- Milli-10-3Thousandth
- Micro-10-6Millionth
- Nano-10-9Billionth
- Pico-10-12Trillionth

- Metric Exponent English
- Tera-1012Trillion
- Giga-109Billion
- Mega-106Million
- Kilo-103Thousand
- Centi10-2Hundredth
- Milli-10-3Thousandth
- Micro-10-6Millionth
- Nano-10-9Billionth
- Pico-10-12Trillionth

- 15 milliamperes
- 150 milliamperes
- 1,500 milliamperes
- 15,000 milliamperes

1

1500 milli- = 1500 x= 1.5

1000

- Metric Exponent English
- Tera-1012Trillion
- Giga-109Billion
- Mega-106Million
- Kilo-103Thousand
- Centi10-2Hundredth
- Milli-10-3Thousandth
- Micro-10-6Millionth
- Nano-10-9Billionth
- Pico-10-12Trillionth

- 0.001 microfarads
- 1 microfarad
- 1000 microfarads
- 1,000,000,000 microfarads

1,000,000 pico- = 106x 10–12= 106–12 = 10–6 = 1 micro-

- One one-millionth of a volt
- One million volts
- One thousand kilovolts
- One one-thousandth of a volt

- Metric Exponent English
- Tera-1012Trillion
- Giga-109Billion
- Mega-106Million
- Kilo-103Thousand
- Centi10-2Hundredth
- Milli-10-3Thousandth
- Micro-10-6Millionth
- Nano-10-9Billionth
- Pico-10-12Trillionth

1 micro- = 10–6 = 1 millionth

- Acid-core solder
- Silver solder
- Rosin-core solder
- Aluminum solder

- Dark black spots
- A bright or shiny surface
- A grainy or dull surface
- A greenish tint

- SWR and RF power
- Signal strength and noise
- Impedance and reactance
- Voltage and resistance

- Ensure that the applied voltages are correct
- Ensure that the circuit is not powered
- Ensure that the circuit is grounded
- Ensure that the circuit is operating at the correct frequency

- Measuring a voltage too small for the chosen scale
- Leaving the meter in the milliamps position overnight
- Attempting to measure voltage when using the resistance setting
- Not allowing it to warm up properly

T7D10What is probably happening when an ohmmeter, connected across a circuit, initially indicates a low resist-ance and then shows increasing resistance with time?

- The ohmmeter is defective
- The circuit contains a large capacitor
- The circuit contains a large inductor
- The circuit is a relaxation oscillator