B has been competing against A for over six months, and there have been more competitions within that period. Why hasn't B managed to win one yet?
Exam Secrets (Part 1)
Units of measurement for radio:
K.3. M.6. G.9. T.12.
m-3. u-6. n-9. p-12.
(Uppercase indicates positive numbers. Lowercase indicates negative numbers)
Peak effectiveness was 35.4%. The average was 0%. Peak effectiveness was 70.7% (for C-type questions).
Antenna: DP dipole, GP vertical whip. BEAM directional. YAGI eight-element. VER vertical.
The legal and regulatory framework is dominated by large departments, where the larger one is correct. Fines are based on the amount; if it's over five thousand yuan, you don't need to pay one thousand yuan; if it's more, you don't need to pay less. Asking whether something is illegal or not is always illegal, and asking whether something is discouraged is also discouraging! All options contain extreme statements, or statements that are not illegal, which are all incorrect.
(This regulation does not apply to radio control)
Exam Secrets (Part 2)
DP Dipole Antenna
GP Directly mounted antenna
BEAM directional antenna
YAGI antenna (also known as a Yagi-Uda antenna)
VER Vertical Antenna
ANT Antenna
ARDF Amateur radio direction finding
Frequency
GND - Ground/Earth connection
OM Old friend
RIG Radio equipment
Receiver, RX - Mail Receiving Device
TX, XMTR - Transmitter
Transceiver
WX Weather
The meaning of the prefix "K" is: ( "x^m" represents "x to the power of m") 10^3
The meaning of the term "m" is: ("x^m" represents "x to the power of m") 10^(-3)
The meaning of the prefix "M" is: ("x^m" represents "x to the power of m") 10^6
The meaning of the prefix "μ" is: (where "x^m" represents "x to the power of m") 10^(-6)
The meanings of the terms "G" are as follows: (where "x^m" represents "x to the power of m") 10^9
The meanings of the terms "n" are as follows: ("x^m" represents "x to the power of m") 10^(-9)
The meanings of the prefixes "T" are as follows: ("x^m" represents "x to the power of m") 10^12
The meanings of the prefixes "p" are as follows: ("x^m" represents "x to the power of m") 10^(-12)
K M G T m μ n p
The frequency range referred to as "audio" is approximately: 16Hz - 20kHz
5W can be represented as: 37 dBm
0.25W can be represented as: 54 dBμ
0.4kW can be represented as: 86 dBμ
Peak value of 100 volts AC sine wave, with an RMS voltage of approximately 35.4 volts.
The peak value is a sinusoidal alternating current voltage of 100 volts, with an effective voltage of approximately 70.7 volts.
Peak value of 100 volts sinusoidal AC voltage, with an average voltage of: 0
The peak value is 100 volts of sinusoidal alternating current voltage, and its average value is: 0
Using standard frequency modulation for voice communication, the required bandwidth is approximately: 6.25 kHz
Which of the following modulation methods is commonly used for VHF or UHF communication in long-distance, weak signal scenarios? SSB
Which of the following modulation methods is widely used for local communication by VHF and UHF amateur radio stations? FM
Exam Secrets (Part 3)
Regarding common radio measurement units: All uppercase letters represent positive exponents, while all lowercase letters represent negative exponents. A radius of 3 kilometers (Km), with only 6 acres (Mu) of land, and a greeting to "9姑" (likely a person's name or title).(G)Dear [Name], Key points:(12)Grape (pT), please refer to it.
Exam Secrets (Part 4)
Prefixes for common radio measurement units: KMGTmunp, respectively representing 10^3, 10^6, 10^9,
12, -3, -6, -9, -12. So, you just need to remember "Kunming Steel doesn't have cowhide" (the first eight letters).
This means that after the B exam, you should take it as soon as possible.
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