2024年6月 – -Nara 2m SSB Lovers-

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6月 30 2024

令和6年06月行事等ログ

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R6-06-30 SUBELEMENT G4A

R6-06-29 SUBELEMENT G3A

R6-06-28 RC 第2542回 MC局: JF3CHM

R6-06-28 ご寄付の更新

R6-06-27 SUBELEMENT G1B

R6-06-26 General Class の構築

R6-06-25 SUBELEMENT G2A

R6-06-24 SUBELEMENT T0C

R6-06-23 SUBELEMENT T8D

R6-06-22 SUBELEMENT T7D

R6-06-21 RC 第2541回 MC局: JF3CHM

R6-06-20 SUBELEMENT T6D

R6-06-19 SUBELEMENT T1F

R6-06-18 SUBELEMENT T1E

R6-06-17 SUBELEMENT T8C

R6-06-16 SUBELEMENT T7C

R6-06-15 SUBELEMENT T5D

R6-06-14 RC 第2540回 MC局: JF3CHM

R6-06-14 タワー付物件/富山・小矢部市

R6-06-13 SUBELEMENT T2C

R6-06-12 SUBELEMENT T1D

R6-06-11 SUBELEMENT G1A

R6-06-11 暗号の利用/FCC

R6-06-10 SUBELEMENT T0B

R6-06-10 SUBELEMENT T9B

R6-06-10 Coaxial cable RG-58, RG213

R6-06-10 PL-259 type coax connectors

R6-06-09 FCCライセンス取得による利点

R6-06-09 SUBELEMENT T7B

R6-06-09 SUBELEMENT T6B

R6-06-08 SUBELEMENT T3B

R6-06-07 RC 第2539回 MC局: JF3CHM

R6-06-07 SUBELEMENT T5C

R6-06-06 SUBELEMENT T5B

R6-06-05 Wire color coding / FCC ライセンス

R6-06-04 FCCライセンス取得案内

R6-06-03 お試し用FCCライセンスTechnician Class

R6-06-03 SUBELEMENT T8A

R6-06-03 SPDT 技術用語/ FCC ライセンス

R6-06-02 SUBELEMENT T5A

R6-06-01 Roll Call CHED (基本45分間)

R6-06-01 SUBELEMENT T3A

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FCCライセンス General

6月 30 2024

SUBELEMENT G4A

FCC General

SUBELEMENT G4A

G4A – Station configuration and operation

1 / 13

G4A01
What is the purpose of the notch filter found on many HF transceivers?

A. To restrict the transmitter voice bandwidth

B. To reduce interference from carriers in the receiver passband

C. To eliminate receiver interference from impulse noise sources

D. To remove interfering splatter generated by signals on adjacent frequencies

2 / 13

G4A02

What is the benefit of using the opposite or “reverse” sideband when receiving CW?

A. Interference from impulse noise will be eliminated

B. More stations can be accommodated within a given signal passband

C. It may be possible to reduce or eliminate interference from other signals

D. Accidental out-of-band operation can be prevented

3 / 13

G4A03

How does a noise blanker work?

A. By temporarily increasing received bandwidth

B. By redirecting noise pulses into a filter capacitor

C. By reducing receiver gain during a noise pulse

D. By clipping noise peaks

4 / 13

G4A04

What is the effect on plate current of the correct setting of a vacuum-tube RF power amplifier’s TUNE control?

A. A pronounced peak

B. A pronounced dip

C. No change will be observed

D. A slow, rhythmic oscillation

5 / 13

G4A05

Why is automatic level control (ALC) used with an RF power amplifier?

A. To balance the transmitter audio frequency response

B. To reduce harmonic radiation

C. To prevent excessive drive

D. To increase overall efficiency

6 / 13

G4A06

What is the purpose of an antenna tuner?

A. Reduce the SWR in the feed line to the antenna

B. Reduce the power dissipation in the feedline to the antenna

C. Increase power transfer from the transmitter to the feed line

D. All these choices are correct

7 / 13

G4A07

What happens as a receiver’s noise reduction control level is increased?

A. Received signals may become distorted

B. Received frequency may become unstable

C. CW signals may become severely attenuated

D. Received frequency may shift several kHz

8 / 13

G4A08

What is the correct adjustment for the LOAD or COUPLING control of a vacuum tube RF power amplifier?

A. Minimum SWR on the antenna

B. Minimum plate current without exceeding maximum allowable grid current

C. Highest plate voltage while minimizing grid current

D. Desired power output without exceeding maximum allowable plate current

9 / 13

G4A09

What is the purpose of delaying RF output after activating a transmitter’s keying line to an external amplifier?

A. To prevent key clicks on CW

B. To prevent transient overmodulation

C. To allow time for the amplifier to switch the antenna between the transceiver and the amplifier output

D. To allow time for the amplifier power supply to reach operating level

10 / 13

G4A10

What is the function of an electronic keyer?

A. Automatic transmit/receive switching

B. Automatic generation of dots and dashes for CW operation

C. To allow time for switching the antenna from the receiver to the transmitter

D. Computer interface for PSK and RTTY operation

11 / 13

G4A11

Why should the ALC system be inactive when transmitting AFSK data signals?

A. ALC will invert the modulation of the AFSK mode

B. The ALC action distorts the signal

C. When using digital modes, too much ALC activity can cause the transmitter to overheat

D. All these choices are correct

12 / 13

G4A12

Which of the following is a common use of the dual-VFO feature on a transceiver?

A. To allow transmitting on two frequencies at once

B. To permit full duplex operation -- that is, transmitting and receiving at the same time

C. To transmit on one frequency and listen on another

D. To improve frequency accuracy by allowing variable frequency output (VFO) operation

13 / 13

G4A13

What is the purpose of using a receive attenuator?

A. To prevent receiver overload from strong incoming signals

B. To reduce the transmitter power when driving a linear amplifier

C. To reduce power consumption when operating from batteries

D. To reduce excessive audio level on strong signals

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FCCライセンス General

6月 29 2024

SUBELEMENT G3A

FCC General

SUBELEMENT G3A

G3A – Sunspots and solar radiation; geomagnetic field and stability indices

1 / 14

G3A01

How does a higher sunspot number affect HF propagation?

A. Higher sunspot numbers generally indicate a greater probability of good propagation at higher frequencies

B. Lower sunspot numbers generally indicate greater probability of sporadic E propagation

C. A zero sunspot number indicates that radio propagation is not possible on any band

D. A zero sunspot number indicates undisturbed conditions

2 / 14

G3A02

What effect does a sudden ionospheric disturbance have on the daytime ionospheric propagation?

A. It enhances propagation on all HF frequencies

B. It disrupts signals on lower frequencies more than those on higher frequencies

C. It disrupts communications via satellite more than direct communications

D. None, because only areas on the night side of the Earth are affected

3 / 14

G3A03

Approximately how long does it take the increased ultraviolet and X-ray radiation from a solar flare to affect radio propagation on Earth?

A. 28 days

B. 1 to 2 hours

C. 8 minutes

D. 20 to 40 hours

4 / 14

G3A04

Which of the following are the least reliable bands for long-distance communications during periods of low solar activity?

A. 80 meters and 160 meters

B. 60 meters and 40 meters

C. 30 meters and 20 meters

D. 15 meters, 12 meters, and 10 meters

5 / 14

G3A05

What is the solar flux index?

A. A measure of the highest frequency that is useful for ionospheric propagation between two points on Earth

B. A count of sunspots that is adjusted for solar emissions

C. Another name for the American sunspot number

D. A measure of solar radiation with a wavelength of 10.7 centimeters

6 / 14

G3A06

What is a geomagnetic storm?

A. A sudden drop in the solar flux index

B. A thunderstorm that affects radio propagation

C. Ripples in the geomagnetic force

D. A temporary disturbance in Earth’s geomagnetic field

7 / 14

G3A07

At what point in the solar cycle does the 20-meter band usually support worldwide propagation during daylight hours?

A. At the summer solstice

B. Only at the maximum point

C. Only at the minimum point

D. At any point

8 / 14

G3A08

How can a geomagnetic storm affect HF propagation?

A. Improve high-latitude HF propagation

B. Degrade ground wave propagation

C. Improve ground wave propagation

D. Degrade high-latitude HF propagation

9 / 14

G3A09

How can high geomagnetic activity benefit radio communications?

A. Creates auroras that can reflect VHF signals

B. Increases signal strength for HF signals passing through the polar regions

C. Improve HF long path propagation

D. Reduce long delayed echoes

10 / 14

G3A10

What causes HF propagation conditions to vary periodically in a 26- to 28-day cycle?

A. Long term oscillations in the upper atmosphere

B. Cyclic variation in Earth’s radiation belts

C. Rotation of the Sun’s surface layers around its axis

D. The position of the Moon in its orbit

11 / 14

G3A11

How long does it take a coronal mass ejection to affect radio propagation on Earth?

A. 28 days

B. 14 days

C. 4 to 8 minutes

D. 15 hours to several days

12 / 14

G3A12

What does the K-index measure?

A. The relative position of sunspots on the surface of the Sun

B. The short-term stability of Earth’s geomagnetic field

C. The short-term stability of the Sun’s magnetic field

D. The solar radio flux at Boulder, Colorado

13 / 14

G3A13

What does the A-index measure?

A. The relative position of sunspots on the surface of the Sun

B. The amount of polarization of the Sun’s electric field

C. The long-term stability of Earth’s geomagnetic field

D. The solar radio flux at Boulder, Colorado

14 / 14

G3A14

How is long distance radio communication usually affected by the charged particles that reach Earth from solar coronal holes?

A. HF communication is improved

B. HF communication is disturbed

C. VHF/UHF ducting is improved

D. VHF/UHF ducting is disturbed

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-Nara 2m SSB Lovers-

-Nara 2m SSB Lovers-

月別アーカイブ: 6月 2024

令和6年06月行事等ログ

SUBELEMENT G4A

G4A01What is the purpose of the notch filter found on many HF transceivers?

G4A02

What is the benefit of using the opposite or “reverse” sideband when receiving CW?

G4A03

How does a noise blanker work?

G4A06

What is the purpose of an antenna tuner?

G4A07

What happens as a receiver’s noise reduction control level is increased?

G4A08

What is the correct adjustment for the LOAD or COUPLING control of a vacuum tube RF power amplifier?

G4A09

What is the purpose of delaying RF output after activating a transmitter’s keying line to an external amplifier?

G4A10

What is the function of an electronic keyer?

G4A11

Why should the ALC system be inactive when transmitting AFSK data signals?

G4A12

Which of the following is a common use of the dual-VFO feature on a transceiver?

G4A13

What is the purpose of using a receive attenuator?

SUBELEMENT G3A

G3A01

How does a higher sunspot number affect HF propagation?

G3A02

What effect does a sudden ionospheric disturbance have on the daytime ionospheric propagation?

G3A03

Approximately how long does it take the increased ultraviolet and X-ray radiation from a solar flare to affect radio propagation on Earth?

G3A04

Which of the following are the least reliable bands for long-distance communications during periods of low solar activity?

G3A05

What is the solar flux index?

G3A06

What is a geomagnetic storm?

G3A07

At what point in the solar cycle does the 20-meter band usually support worldwide propagation during daylight hours?

G3A08

How can a geomagnetic storm affect HF propagation?

G3A09

How can high geomagnetic activity benefit radio communications?

G3A10

What causes HF propagation conditions to vary periodically in a 26- to 28-day cycle?

G3A11

How long does it take a coronal mass ejection to affect radio propagation on Earth?

G3A12

What does the K-index measure?

G3A13

What does the A-index measure?

G3A14

How is long distance radio communication usually affected by the charged particles that reach Earth from solar coronal holes?

G4A01
What is the purpose of the notch filter found on many HF transceivers?