CRAC Bilingual Manual › Part: Laws, Regulations and Rules
CRAC Bilingual Exam Manual (Class A / B / C) | 中国业余无线电台操作技术能力验证英中对照手册
This section covers Frequency Allocation and Emission with 50 bilingual questions from the CRAC 2025 question bank. Each question shows the original Chinese (left) and the English translation (right). The correct answer is highlighted in green, followed by a Knowledge Point Analysis and Candidate Tips covering US–China differences, common pitfalls, and real on-air practice.
Class badges ABC indicate which license-class syllabus includes each question. Class A is the entry level, Class B adds HF privileges, and Class C is the advanced level.
业余无线电台在业余业务、卫星业余业务作为次要业务使用的频率或者与其他主要业务共同使用的频率上发射操作时，应当注意：
- A遵守无线电管理机构对该频率的使用规定
- B首先守听频率是否已由其他业务电台占用，如听不到，即可按照先来先用的原则放心使用
- C只要遵守了《中华人民共和国无线电频率划分规定》的有关规定即可放心使用
- D可以任意使用，但在遇到其他业务电台使用时要主动避让
When an amateur radio station transmits on a frequency where the amateur service or amateur-satellite service is used as a secondary service, or is shared with other primary services, it should observe:
- Acomply with the usage provisions of the radio management authority for that frequency
- Bfirst listen to see whether the frequency is already occupied by other-service stations; if nothing is heard, one may use it at ease under the first-come-first-served principle
- Cas long as one complies with the relevant provisions of the Radio Frequency Allocation Regulations of the PRC, one may use it at ease
- Done may use it arbitrarily, but should voluntarily yield when encountering other-service stations in use
On frequencies where amateur is a secondary service or shares with primary services, the station must comply with the specific usage provisions set by the radio management authority for that frequency (A). B (first-come-first-served) and D (arbitrary use) are wrong because a secondary service may never cause harmful interference, regardless of who was there first. C is insufficient because the allocation table alone does not cover the operational restrictions imposed on secondary use.
US–China difference: In the US the same principle applies — on a secondary (e.g., 432 MHz) allocation you must avoid interfering with primary users such as radar.
Common pitfall: Assuming “if I don’t hear them, the frequency is free” — primary-service radar can be silent yet still protected.
Real on-air practice: On 430–440 MHz (secondary), if a radionavigation signal appears you must move off immediately.
关于业余频率的使用，正确的叙述是：
- A业余无线电台在无线电管理机构核准其使用的频段内，享有平等的频率使用权
- B任何业余无线电台在任何频段都享有平等的频率使用权
- C业余无线电台在无线电管理机构核准其使用的频段内，不同类别的业余电台享有不同优先程度的频率使用权
- D依法成立的地方业余无线电民间组织的业余电台，在其常用的台网频率上享有比其他个人设置的业余电台优先的使用权
The correct statement about the use of amateur frequencies is:
- Awithin the bands approved by the radio management authority for its use, an amateur radio station enjoys equal frequency-use rights
- Bany amateur radio station enjoys equal frequency-use rights in any band
- Cwithin the bands approved by the radio management authority for its use, amateur stations of different classes enjoy different priority levels of frequency-use rights
- Dthe amateur station of a legally established local amateur civil organization enjoys priority use on its usual net frequency over stations set up by individuals
Within the bands that the radio management authority has approved for a station’s use, all amateur stations enjoy equal frequency-use rights (A). B is too broad (not “any band”); C wrongly implies class-based priority; D wrongly implies association/club priority. No amateur station outranks another on an amateur frequency.
US–China difference: The US likewise grants equal shared access to all licensees on a frequency; no club has priority.
Common pitfall: Thinking a club net “owns” its frequency — it does not.
Real on-air practice: Anyone may join a club net frequency; the net cannot exclude other amateurs.
在频率划分表中，当一个频段划分给业余业务或卫星业余业务和多个其他业务，并且业余业务和卫星业余业务作为次要业务时，业余无线电台应该遵循的规则是：
- A不得对主要业务电台产生有害干扰
- B可要求保护不受来自主要业务电台的有害干扰
- C不得对来自同一业务或其他次要业务电台的有害干扰提出保护要求
- D容许因设备技术问题对主要业务电台产生短时间有害干扰
In the Table of Frequency Allocations, when a band is allocated to the amateur service or amateur-satellite service together with several other services, and the amateur service and amateur-satellite service are secondary services, the rule an amateur radio station must follow is:
- Amust not cause harmful interference to primary-service stations
- Bmay claim protection from harmful interference coming from primary-service stations
- Cmay not claim protection from harmful interference by stations of the same service or other secondary services
- Dpermits brief harmful interference to primary-service stations due to equipment problems
The fundamental secondary-service obligation is that the amateur station must not cause harmful interference to primary-service stations (A). B is wrong — a secondary service may not claim protection from primary users. C is also wrong here: a secondary service may claim protection from other secondary/same-service stations, so the statement “may not claim protection” is false. D is plainly prohibited — no interference is ever permitted.
US–China difference: Identical ITU secondary-service rule in the US: no harmful interference to primary, no protection claim from primary.
Common pitfall: Confusing the two halves of the secondary-service rule; this question tests the “no interference to primary” half.
Real on-air practice: On 430–440 MHz, your first duty is to avoid harming radionavigation receivers.
在频率划分表中，当一个频段划分给业余业务或卫星业余业务和多个其他业务，并且业余业务和卫星业余业务作为次要业务时，业余无线电台遵循的规则是：
- A不得对来自主要业务电台的有害干扰提出保护要求
- B可要求保护不受来自主要业务电台的有害干扰
- C不得对来自同一业务或其他次要业务电台的有害干扰提出保护要求
- D容许因设备技术问题对主要业务电台产生短时间有害干扰
In the Table of Frequency Allocations, when a band is allocated to the amateur service or amateur-satellite service together with several other services, and the amateur service and amateur-satellite service are secondary services, the rule an amateur radio station follows is:
- Amust not claim protection from harmful interference coming from primary-service stations
- Bmay claim protection from harmful interference coming from primary-service stations
- Cmay not claim protection from harmful interference by stations of the same service or other secondary services
- Dpermits brief harmful interference to primary-service stations due to equipment problems
This is the other half of the secondary-service rule: a secondary service must not claim protection from harmful interference by primary-service stations (A). B is the negation and is wrong. C is wrong because a secondary service may claim protection from other secondary/same-service stations. D is always prohibited.
US–China difference: Same rule: you cannot demand a primary user stop because it is interfering with you.
Common pitfall: Pairing this with U0167 — together they state both duties of a secondary service.
Real on-air practice: If a primary radar wipes out your 70 cm contact, you move; you cannot complain.
我国分配给业余业务和卫星业余业务专用的频段有：
- A7MHz、14MHz、21MHz、28MHz、47GHz频段
- B7MHz、14MHz、21MHz、28MHz、144MHz频段
- C3.5MHz、14MHz、21MHz、28MHz、10GHz频段
- D7MHz、14MHz、28MHz、144MHz、430MHz频段
The frequency bands allocated by our country exclusively to the amateur service and amateur-satellite service are:
- Athe 7 MHz, 14 MHz, 21 MHz, 28 MHz, and 47 GHz bands
- Bthe 7 MHz, 14 MHz, 21 MHz, 28 MHz, and 144 MHz bands
- Cthe 3.5 MHz, 14 MHz, 21 MHz, 28 MHz, and 10 GHz bands
- Dthe 7 MHz, 14 MHz, 28 MHz, 144 MHz, and 430 MHz bands
The bands China allocates exclusively (专用) to the amateur service are 7 MHz, 14 MHz, 21 MHz, 28 MHz, and 47 GHz (A). 144 MHz and 430 MHz are shared (not exclusive), so B and D are wrong; 3.5 MHz is a shared primary band and 10 GHz is not in this exclusive list, so C is wrong.
US–China difference: The US also treats 40/20/15/10 m as exclusive amateur, but band edges differ by region.
Common pitfall: Mistaking 144 MHz or 430 MHz (both shared) for exclusive allocations.
Real on-air practice: On 20 m (14 MHz) you are the sole primary user — no radar to worry about.
我国分配给业余业务和卫星业余业务与其他业务共用、并且业余业务和卫星业余业务作为主要业务之一的30MHz以下频段有：
- A1.8MHz、3.5MHz、14.25MHz、18.068MHz、24.89MHz频段
- B3.5MHz、7MHz、14.25MHz、21MHz、24.89MHz频段
- C3.5MHz、10.1MHz、14.25MHz、18.068MHz、29.7MHz频段
- D1.8MHz、10.1MHz、14.25MHz、18.068MHz、21.45MHz频段
The bands below 30 MHz that our country allocates for shared use between the amateur service (and amateur-satellite service) and other services, with the amateur service as one of the primary services, are:
- Athe 1.8 MHz, 3.5 MHz, 14.25 MHz, 18.068 MHz, and 24.89 MHz bands
- Bthe 3.5 MHz, 7 MHz, 14.25 MHz, 21 MHz, and 24.89 MHz bands
- Cthe 3.5 MHz, 10.1 MHz, 14.25 MHz, 18.068 MHz, and 29.7 MHz bands
- Dthe 1.8 MHz, 10.1 MHz, 14.25 MHz, 18.068 MHz, and 21.45 MHz bands
Below 30 MHz, the shared bands where amateur is one of the primary services include 1.8 MHz, 3.5 MHz, 14.25 MHz, 18.068 MHz, and 24.89 MHz (A). B wrongly includes 7 MHz (exclusive) and 21 MHz (exclusive); C/D include 10.1 MHz which is a WARC band allocated as a secondary/shared category, not a shared-primary band in this listing.
US–China difference: US band edges differ; e.g., 1.8 MHz and 10.1 MHz are not standard US HF allocations.
Common pitfall: Confusing exclusive-primary bands (7/21 MHz) with shared-primary bands.
Real on-air practice: 18.068 and 24.89 MHz are the WARC bands you operate only within their narrow segments.
我国在VHF和UHF范围内分配给业余业务和卫星业余业务与其他业务共用并设业务类别为主要业务与次要业务，以下那些频率分配给业余业务和卫星业余业务与其他业务共用并且业余业务和卫星业余业务作为主要业务：
- A50MHz、144MHz
- B144MHz、430MHz
- C50MHz、430MHz
- D220MHz、430MHz
In the VHF and UHF range, our country allocates the amateur service (and amateur-satellite service) for shared use with other services under both primary and secondary categories. Which of the following frequencies are allocated for shared use with other services where the amateur service is a primary service:
- A50 MHz, 144 MHz
- B144 MHz, 430 MHz
- C50 MHz, 430 MHz
- D220 MHz, 430 MHz
In VHF/UHF, 50 MHz and 144 MHz are allocated to amateur as a primary service sharing with others (A). 430 MHz is a secondary service, so any option containing 430 MHz (B, C, D) is wrong.
US–China difference: In the US 6 m (50 MHz) and 2 m (144 MHz) are primary amateur bands too.
Common pitfall: Pairing 430 MHz (secondary) with 144 MHz (primary) as both primary.
Real on-air practice: Your 2 m FM repeater operates as a primary user on 144 MHz.
我国分配给业余业务和卫星业余业务与其他业务共用、并且业余业务和卫星业余业务作为唯一主要业务的频段的个数以及在3GHz以下的该类频段分别为：
- A3个，144-146MHz
- B4个，7.0-7.2MHz
- C5个，50-54MHz
- D5个，28-29.7MHz
The number of bands our country allocates for shared use with other services where the amateur service is the sole primary service, and such a band below 3 GHz, are respectively:
- A3 bands; 144–146 MHz
- B4 bands; 7.0–7.2 MHz
- C5 bands; 50–54 MHz
- D5 bands; 28–29.7 MHz
There are 3 bands where amateur is the sole primary among shared allocations; below 3 GHz one such band is 144–146 MHz (A). 7.0–7.2 MHz and 50–54 MHz are exclusively amateur, and 28–29.7 MHz is exclusive, so B/C/D are wrong.
US–China difference: The US 2 m band (144–148 MHz) is also a primary shared allocation.
Common pitfall: Counting exclusive bands (7/28/50 MHz) as “sole primary shared” bands.
Real on-air practice: The 144–146 MHz segment is your sole-primary shared 2 m allocation.
我国分配给业余业务和卫星业余业务与其他业务共用、并且业余业务和卫星业余业务作为次要业务的1200MHz以下频段有：
- A135.7kHz、5351.5KHz、10.1MHz、430MHz
- B3.5MHz、7MHz、50MHz
- C3.5MHz、18.068MHz、144MHz
- D10.1MHz、24.89MHz、430MHz
The bands below 1200 MHz that our country allocates for shared use where the amateur service is a secondary service are:
- A135.7 kHz, 5351.5 kHz, 10.1 MHz, 430 MHz
- B3.5 MHz, 7 MHz, 50 MHz
- C3.5 MHz, 18.068 MHz, 144 MHz
- D10.1 MHz, 24.89 MHz, 430 MHz
Below 1200 MHz, the secondary amateur allocations include 135.7 kHz, 5351.5 kHz, 10.1 MHz, and 430 MHz (A). 3.5 MHz and 7 MHz are primary/exclusive, 50 MHz and 144 MHz are primary, and 18.068 MHz / 24.89 MHz are shared-primary WARC bands — so B, C, and D are wrong.
US–China difference: 430 MHz (70 cm) is also secondary in the US; 10.1 MHz is not a US allocation.
Common pitfall: Mixing primary WARC bands (18/24 MHz) into the secondary list.
Real on-air practice: On 70 cm you must defer to primary radionavigation users.
我国分配给业余业务和卫星业余业务的频率最高的频段及其共用类别是：
- A248-250GHz，唯一主要业务
- B134-136GHz，唯一主要业务
- C47-47.2GHz，专用业务
- D77.5-78GHz，主要业务
The highest frequency band allocated by our country to the amateur service and amateur-satellite service, and its sharing category, are:
- A248–250 GHz, sole primary service
- B134–136 GHz, sole primary service
- C47–47.2 GHz, exclusive service
- D77.5–78 GHz, primary service
The highest amateur allocation in China is 248–250 GHz, as the sole primary service (A). The other listed bands are lower in frequency, so B/C/D are wrong.
US–China difference: The US 10th harmonic band (2300–2310 GHz region) differs; the highest US amateur band is 241–250 GHz too.
Common pitfall: Picking 47 GHz (a more familiar microwave band) as the highest.
Real on-air practice: Millimeter-wave (EHF) contesting happens up near 240 GHz with specialized gear.
国际业余无线电界把WARC-76增加分配给业余业务和卫星业余业务的三个HF频段俗称为WARC频段，它们的频率范围是：
- A10.1-10.15MHz、18.068-18.168MHz、24.89-24.99MHz
- B10.068-10.168MHz、18.1-18.15MHz、24.89-24.99MHz
- C10.1-10.15MHz、18.89-18.99MHz、24.068-24.168MHz
- D10.89-10.88MHz、18.1-18.15MHz、24.068-24.168MHz
The international amateur community colloquially calls the three HF bands added to the amateur (and amateur-satellite) service by WARC-76 the “WARC bands”; their frequency ranges are:
- A10.1–10.15 MHz, 18.068–18.168 MHz, 24.89–24.99 MHz
- B10.068–10.168 MHz, 18.1–18.15 MHz, 24.89–24.99 MHz
- C10.1–10.15 MHz, 18.89–18.99 MHz, 24.068–24.168 MHz
- D10.89–10.88 MHz, 18.1–18.15 MHz, 24.068–24.168 MHz
The three WARC-76 HF bands are 10.1–10.15 MHz, 18.068–18.168 MHz, and 24.89–24.99 MHz (A). The other options scramble the boundaries or swap digits.
US–China difference: Same WARC bands exist in the US; they were added worldwide by WARC-79 (ratified after the 1976 conference).
Common pitfall: Remembering the wrong narrow boundaries of the 18 MHz and 24 MHz WARC segments.
Real on-air practice: You operate 18.068–18.168 MHz with CW/RTTY; the edges are strict.
俗称的40米业余波段，其在ITU1、2、3区的频率范围以及业余业务和卫星业余业务的使用状态分别为：
- A7.0-7.2MHz、7.0-7.3MHz、7.0-7.2MHz，专用
- B7.0-7.3MHz、7.0-7.3MHz、7.0-7.3MHz，专用
- C7.0-7.3MHz、7.0-7.3MHz、7.0-7.2MHz，专用
- D7.0-7.1MHz、7.0-7.2MHz、7.0-7.3MHz，专用
The so-called 40 m amateur band, its frequency ranges in ITU Regions 1, 2, and 3 and the amateur-service usage status, are respectively:
- A7.0–7.2 MHz, 7.0–7.3 MHz, 7.0–7.2 MHz; exclusive
- B7.0–7.3 MHz, 7.0–7.3 MHz, 7.0–7.3 MHz; exclusive
- C7.0–7.3 MHz, 7.0–7.3 MHz, 7.0–7.2 MHz; exclusive
- D7.0–7.1 MHz, 7.0–7.2 MHz, 7.0–7.3 MHz; exclusive
The 40 m band is 7.0–7.2 MHz in Region 1, 7.0–7.3 MHz in Region 2, and 7.0–7.2 MHz in Region 3 (China), and it is an exclusive (专用) amateur allocation (A). Options B/C/D misstate one or more region’s edges.
US–China difference: In the US (Region 2) 40 m is 7.0–7.3 MHz; China (Region 3) is 7.0–7.2 MHz.
Common pitfall: Assuming all three ITU regions share the same 40 m edges.
Real on-air practice: A Chinese station must stay below 7.200 MHz even when working Region 2 stations.
俗称的160米业余波段的频率范围以及业余业务和卫星业余业务的使用状态分别为：
- A1800-2000kHz，主要业务
- B1800-1900kHz，次要业务
- C1900-2000kHz，主要业务
- D1700-1900kHz，专用业务
The frequency range of the so-called 160 m amateur band and the amateur-service usage status are respectively:
- A1800–2000 kHz; primary service
- B1800–1900 kHz; secondary service
- C1900–2000 kHz; primary service
- D1700–1900 kHz; exclusive service
The 160 m band is 1800–2000 kHz and amateur is a primary service (主要业务) there (A). The other options give wrong edges or wrong service category.
US–China difference: In the US 160 m is 1.8–2.0 MHz as well, but power limits and regulations differ.
Common pitfall: Confusing 160 m (1.8–2.0 MHz, MF) edges with 80 m.
Real on-air practice: 160 m is a “top band” used for DX at night with NVIS-style antennas.
俗称的80米业余波段的频率范围以及业余业务和卫星业余业务的使用状态分别为：
- A3.5-3.9MHz，主要业务
- B3.5-3.9MHz，次要业务
- C3.5-4.0MHz，主要业务
- D3.5-3.6MHz，专用业务
The frequency range of the so-called 80 m amateur band and the amateur-service usage status are respectively:
- A3.5–3.9 MHz; primary service
- B3.5–3.9 MHz; secondary service
- C3.5–4.0 MHz; primary service
- D3.5–3.6 MHz; exclusive service
The 80 m band is 3.5–3.9 MHz and amateur is a primary service (主要业务) there (A). Other options give wrong service category or wrong upper edge (4.0 MHz is Region 2).
US–China difference: US 80 m is 3.5–4.0 MHz; China stops at 3.9 MHz.
Common pitfall: Using the US 4.0 MHz upper edge in a China exam.
Real on-air practice: 80 m phone (LSB) in China runs 3.6–3.9 MHz.
俗称的20米业余波段的频率范围以及业余业务和卫星业余业务的使用状态分别为：
- A14-14.25MHz为专用，14.25-14.35为主要业务
- B14-14.15MHz为专用，14.15-14.25为主要业务
- C14-14.35MHz为专用，14.35-14.45为主要业务
- D14-14.35MHz，专用
The frequency range of the so-called 20 m amateur band and the amateur-service usage status are respectively:
- A14–14.25 MHz is exclusive, 14.25–14.35 MHz is primary service
- B14–14.15 MHz is exclusive, 14.15–14.25 MHz is primary service
- C14–14.35 MHz is exclusive, 14.35–14.45 MHz is primary service
- D14–14.35 MHz; exclusive
The 20 m band in China is 14–14.25 MHz exclusive (专用) and 14.25–14.35 MHz primary service (主要业务) (A). The other options misstate the split point or the upper edge.
US–China difference: US 20 m is 14.0–14.35 MHz entirely; China treats the upper 100 kHz as shared-primary.
Common pitfall: Treating all of 14–14.35 MHz as exclusive.
Real on-air practice: On 14.25–14.35 MHz you are a primary (shared) user, still above most primary interference.
俗称的15米业余波段的频率范围以及业余业务和卫星业余业务的使用状态分别为：
- A21-21.45MHz，专用
- B21-21.45MHz，主要业务
- C21-21.35MHz，专用
- D21-21.45MHz，次要业务
The frequency range of the so-called 15 m amateur band and the amateur-service usage status are respectively:
- A21–21.45 MHz; exclusive
- B21–21.45 MHz; primary service
- C21–21.35 MHz; exclusive
- D21–21.45 MHz; secondary service
The 15 m band is 21–21.45 MHz and is an exclusive (专用) amateur allocation (A). The other options use the right edges with the wrong service category.
US–China difference: US 15 m is also 21.0–21.45 MHz exclusive.
Common pitfall: Confusing the service category (exclusive vs primary) of 15 m.
Real on-air practice: 15 m is a favorite daytime DX band.
俗称的10米业余波段的频率范围以及业余业务和卫星业余业务的使用状态分别为：
- A28-29.7MHz，专用
- B28-29.7MHz，主要业务
- C28-29.6MHz，专用
- D28-30MHz，次要业务
The frequency range of the so-called 10 m amateur band and the amateur-service usage status are respectively:
- A28–29.7 MHz; exclusive
- B28–29.7 MHz; primary service
- C28–29.6 MHz; exclusive
- D28–30 MHz; secondary service
The 10 m band is 28–29.7 MHz and is an exclusive (专用) amateur allocation (A). The other options change the upper edge or the category.
US–China difference: US 10 m is 28.0–29.7 MHz as well, including a CW/phone segment and 29.5–29.7 MHz repeater inputs.
Common pitfall: Thinking 10 m extends to 30 MHz (it stops at 29.7).
Real on-air practice: 10 m FM repeaters use 29.6 MHz; 29.5–29.7 MHz is the repeater sub-band.
俗称的6米业余波段的频率范围以及业余业务和卫星业余业务的使用状态分别为：
- A50-54MHz，主要业务
- B50-52MHz，次要业务
- C51-54MHz，专用
- D52-56MHz，次要业务
The frequency range of the so-called 6 m amateur band and the amateur-service usage status are respectively:
- A50–54 MHz; primary service
- B50–52 MHz; secondary service
- C51–54 MHz; exclusive
- D52–56 MHz; secondary service
The 6 m band is 50–54 MHz and amateur is a primary service (主要业务) there (A). The other options give wrong edges or category.
US–China difference: US 6 m is 50–54 MHz too, but with different sub-band plans (e.g., 52–54 MHz repeater).
Common pitfall: Confusing 6 m (50–54, primary) with 70 cm (430–440, secondary).
Real on-air practice: 6 m is the “magic band” — sporadic-E openings bring long-distance VHF contacts.
俗称的2米业余波段的频率范围以及我国业余业务和卫星业余业务的使用状态分别为：
- A144-148MHz；其中144-146MHz为唯一主要业务，146-148MHz为与其他业务共同作为主要业务
- B144-146MHz；专用
- C144-148MHz；其中144-146MHz为专用，146-148MHz为次要业务
- D144-148MHz；次要业务
The frequency range of the so-called 2 m amateur band and the amateur-service usage status in our country are respectively:
- A144–148 MHz; of which 144–146 MHz is the sole primary service, and 146–148 MHz is shared with other services as a primary service
- B144–146 MHz; exclusive
- C144–148 MHz; of which 144–146 MHz is exclusive, 146–148 MHz is secondary service
- D144–148 MHz; secondary service
In China the 2 m band is 144–148 MHz: 144–146 MHz is sole primary (唯一主要业务), and 146–148 MHz is shared-primary with other services (A). B is too narrow; C/D misstate the 146–148 MHz category.
US–China difference: US 2 m is 144–148 MHz; the upper part is also primary/shared there.
Common pitfall: Treating all of 144–148 MHz as exclusive.
Real on-air practice: FM simplex and repeaters sit across 144–148 MHz; 145–148 is shared-primary.
俗称的0.7米业余波段的频率范围以及业余业务和卫星业余业务的使用状态分别为：
- A430-440MHz，次要业务
- B430-440MHz，主要业务
- C430-440MHz，专用
- D420-470MHz，次要业务
The frequency range of the so-called 0.7 m (70 cm) amateur band and the amateur-service usage status are respectively:
- A430–440 MHz; secondary service
- B430–440 MHz; primary service
- C430–440 MHz; exclusive
- D420–470 MHz; secondary service
The 70 cm band in China is 430–440 MHz and amateur is a secondary service (次要业务) there (A). The other options change the category or widen the edges.
US–China difference: US 70 cm is 420–450 MHz and also secondary to primary users such as radar.
Common pitfall: Treating 430–440 MHz as primary/exclusive like 2 m.
Real on-air practice: 70 cm repeaters must coordinate around the satellite and radar primary users.
在我国和多数其他国家的频率分配中，业余业务在430-440MHz频段中作为次要业务与其他业务共用。这个频段中我国分配的主要业务是：
- A无线电定位和航空无线电导航
- B固定业务
- C移动业务
- D水上移动和航空移动
In the frequency allocation of our country and most others, the amateur service is a secondary service sharing the 430–440 MHz band with other services. The primary service allocated in this band in our country is:
- Aradiodetermination (radiolocation) and aeronautical radionavigation
- Bthe fixed service
- Cthe mobile service
- Dmaritime mobile and aeronautical mobile
In the 430–440 MHz band, China’s primary services are 无线电定位 (radiolocation) and 航空无线电导航 (aeronautical radionavigation) (A). Amateur is secondary, so it must avoid interfering with these primary users.
US–China difference: Same primary users (radiolocation/radar) dominate 70 cm in the US.
Common pitfall: Thinking the band is “amateur’s” because hams use it heavily.
Real on-air practice: Avoid 435–438 MHz (satellite downlink) and radar frequencies on 70 cm.
我国分配给业余业务和卫星业余业务的属于低频（LF）范围的频段为：
- A135.7-137.8kHz
- B137.8-138.6kHz
- C134.7-135.8kHz
- D472-479kHz
The band allocated by our country to the amateur service and amateur-satellite service that falls within the low-frequency (LF) range is:
- A135.7–137.8 kHz
- B137.8–138.6 kHz
- C134.7–135.8 kHz
- D472–479 kHz
The LF (低频/长波) amateur band is 135.7–137.8 kHz (A). 472–479 kHz is actually MF (中频), and B/C are not amateur allocations.
US–China difference: The US has no LF amateur allocation; 472 kHz (600 m) is a European/amateur MF band.
Common pitfall: Confusing the 135.7 kHz LF band with the 472 kHz band.
Real on-air practice: 135.7 kHz is a very narrow CW/QRSS band for weak-signal LF experimenters.
短波业余电台应避免在IARU信标工作频率±500Hz的范围内发射电波。这些频率是：
- A14.100MHz、18.110MHz、21.150MHz、24.930MHz、28.200MHz
- B7.100MHz、10.070MHz、14.100MHz、21.100MHz、28.200MHz
- C7.150MHz、14.110MHz、18.150MHz、21.150MHz、28.150MHz
- D14.150MHz、18.100MHz、21.200MHz、24.930MHz、28.200MHz
Short-wave amateur stations should avoid transmitting within ±500 Hz of the IARU beacon operating frequencies. Those frequencies are:
- A14.100 MHz, 18.110 MHz, 21.150 MHz, 24.930 MHz, 28.200 MHz
- B7.100 MHz, 10.070 MHz, 14.100 MHz, 21.100 MHz, 28.200 MHz
- C7.150 MHz, 14.110 MHz, 18.150 MHz, 21.150 MHz, 28.150 MHz
- D14.150 MHz, 18.100 MHz, 21.200 MHz, 24.930 MHz, 28.200 MHz
The IARU international beacons (NCDXF/IARU) operate on 14.100, 18.110, 21.150, 24.930, and 28.200 MHz; amateurs must keep clear of these within ±500 Hz (A). The other options mix in wrong frequencies.
US–China difference: These beacon frequencies are global (IARU), identical in the US.
Common pitfall: Forgetting the 21.150 MHz beacon when operating 15 m phone near the edge.
Real on-air practice: You tune to a beacon’s CW ID to gauge band openings before calling CQ.
我国短波业余电台在7MHz频段进行LSB通话时可以实际占用的频率为：
- A7.030-7.200MHz
- B7.000-7.100MHz
- C7.023-7.200MHz
- D7.000-7.200MHz
On the 7 MHz band, the frequency range a Chinese short-wave amateur station may actually occupy when conducting LSB voice contacts is:
- A7.030–7.200 MHz
- B7.000–7.100 MHz
- C7.023–7.200 MHz
- D7.000–7.200 MHz
For LSB (lower sideband) on 7 MHz, the carrier is placed above the band’s 7.000 MHz lower edge by roughly one sideband width (~3 kHz), so the usable carrier range is 7.030–7.200 MHz (A). Options that start at 7.000 MHz would push the lower sideband below the band edge (B, D) or use an incorrect offset (C).
US–China difference: US 75 m LSB also keeps the lower sideband above 3.525 MHz; the offset logic is the same.
Common pitfall: Setting the dial to exactly 7.000 MHz on LSB, which spills below the band.
Real on-air practice: You tune your 7 MHz LSB dial to ~7.030+ so the audio sideband stays in-band.
短波业余电台在14MHz频段进行USB通话时可以实际占用的频率为：
- A14.100-14.350MHz
- B14.030-14.350MHz
- C14.000-14.250MHz
- D14.070-14.250MHz
On the 14 MHz band, the frequency range a short-wave amateur station may actually occupy when conducting USB voice contacts is:
- A14.100–14.350 MHz
- B14.030–14.350 MHz
- C14.000–14.250 MHz
- D14.070–14.250 MHz
For USB on 14 MHz, the carrier is raised above 14.000 MHz by about one sideband width so the lower sideband stays in-band, giving 14.100–14.350 MHz (A). The upper edge is the band limit 14.350 MHz. B starts too low (14.030 would push the lower sideband below 14.000); C/D truncate the upper edge.
US–China difference: Same USB offset logic; US 20 m voice is 14.225–14.350 MHz by band plan.
Common pitfall: Forgetting the ~100 kHz lower offset that keeps the sideband inside 14.000.
Real on-air practice: 14.100–14.350 MHz is where you find 20 m SSB phone.
短波业余电台在18MHz频段进行USB通话时可以实际占用的频率为：
- A18.1105-18.168MHz
- B18.110-18.170MHz
- C18.068-18.186MHz
- D18.1005-18.180MHz
On the 18 MHz band, the frequency range a short-wave amateur station may actually occupy when conducting USB voice contacts is:
- A18.1105–18.168 MHz
- B18.110–18.170 MHz
- C18.068–18.186 MHz
- D18.1005–18.180 MHz
The 18 MHz WARC band is 18.068–18.168 MHz. For USB voice, the carrier is offset above 18.068 by one sideband width and capped at the 18.168 upper edge, giving 18.1105–18.168 MHz (A). B/C/D overreach the band edges.
US–China difference: Same WARC 18 MHz band worldwide; the USB offset is identical.
Common pitfall: Using the full 18.068–18.168 edges as the voice carrier range.
Real on-air practice: 18.1105–18.168 MHz is the narrow 17 m phone window.
短波业余电台在21MHz频段进行USB通话时可以实际占用的频率为：
- A21.125-21.45MHz，除去21.1495-21.1505
- B21.125-21.45MHz
- C21-21.45MHz
- D21-21.35MHz
On the 21 MHz band, the frequency range a short-wave amateur station may actually occupy when conducting USB voice contacts is:
- A21.125–21.45 MHz, excluding 21.1495–21.1505 MHz
- B21.125–21.45 MHz
- C21–21.45 MHz
- D21–21.35 MHz
On 21 MHz (15 m), USB voice occupies 21.125–21.45 MHz, but must exclude the IARU beacon at 21.150 MHz (±500 Hz → 21.1495–21.1505) (A). B omits the beacon exclusion; C/D use the wrong lower edge (21.000).
US–China difference: US 15 m voice also avoids the 21.150 beacon; band plan similar.
Common pitfall: Forgetting to exclude the 21.150 MHz beacon segment.
Real on-air practice: You keep your 15 m SSB dial away from 21.150 MHz.
短波业余电台在24MHz频段进行USB通话时可以实际占用的频率为：
- A24.9305-24.99MHz
- B24.928-24.988MHz
- C24.890-24.98MHz
- D24.9205-24.99MHz
On the 24 MHz band, the frequency range a short-wave amateur station may actually occupy when conducting USB voice contacts is:
- A24.9305–24.99 MHz
- B24.928–24.988 MHz
- C24.890–24.98 MHz
- D24.9205–24.99 MHz
The 24 MHz WARC band is 24.89–24.99 MHz. USB voice starts above the 24.930 beacon (the 24.930 MHz IARU beacon plus offset) and ends at the 24.99 upper edge, giving 24.9305–24.99 MHz (A). Other options ignore the beacon exclusion or use wrong edges.
US–China difference: Same 24 MHz WARC band and beacon exclusion worldwide.
Common pitfall: Starting voice at the 24.89 lower edge rather than above the beacon.
Real on-air practice: 12 m phone is a thin 24.9305–24.99 MHz slice.
短波业余电台在29MHz频段进行USB通话时可以实际占用的频率为：
- A28.3-29.3MHz
- B28-29.7MHz
- C28.250-29.7MHz
- D28.2-29.6MHz
On the ~29 MHz band, the frequency range a short-wave amateur station may actually occupy when conducting USB voice contacts is:
- A28.3–29.3 MHz
- B28–29.7 MHz
- C28.250–29.7 MHz
- D28.2–29.6 MHz
The 10 m band is 28–29.7 MHz. For USB voice near the top, the usable window is 28.3–29.3 MHz (A) — kept below 29.7 to contain the upper sideband and above 28.3 to keep the lower sideband in-band. B/D use the full band edges (sideband would spill), and C reaches the 29.7 top edge.
US–China difference: US 10 m voice is 28.3–29.7 MHz (with a repeater sub-band at 29.5+); China’s tested window is 28.3–29.3.
Common pitfall: Using the full 28–29.7 edges as the voice carrier range.
Real on-air practice: 10 m SSB phone sits 28.3–29.3 MHz, while 29.5–29.7 is repeaters.
短波业余电台在29MHz频段进行FM通话时可以实际占用的频率为：
- A29.51-29.7MHz
- B29.3-29.7MHz
- C28.3-29.510MHz z
- D28-29.7MHz
On the ~29 MHz band, the frequency range a short-wave amateur station may actually occupy when conducting FM voice contacts is:
- A29.51–29.7 MHz
- B29.3–29.7 MHz
- C28.3–29.510 MHz z
- D28–29.7 MHz
FM needs a wider bandwidth, so on 10 m it is confined to the top of the band, 29.51–29.7 MHz (A), which is the FM/repeater segment. B is too wide; C and D include the SSB/lower regions. (Note: option C in the source contains a stray character “z”, preserved verbatim.)
US–China difference: US 10 m FM also sits at the top, 29.5–29.7 MHz (repeater inputs/outputs).
Common pitfall: Assuming FM can use the whole 28–29.7 MHz band like SSB.
Real on-air practice: 10 m FM simplex/repeaters live in 29.5–29.7 MHz.
VHF业余无线电台在144MHz频段进行本地联络时应避免占用的频率为：
- A144-144.035MHz和145.8-146MHz
- B144.035-145.8MHz
- C144.050-144.053MHz和145.100-145.750MHz
- D144.035-144.053MHz和145.550-145.750MHz
When conducting local contacts on the 144 MHz band, the frequencies a VHF amateur station should avoid occupying are:
- A144–144.035 MHz and 145.8–146 MHz
- B144.035–145.8 MHz
- C144.050–144.053 MHz and 145.100–145.750 MHz
- D144.035–144.053 MHz and 145.550–145.750 MHz
For local 2 m work you should avoid 144–144.035 MHz (EME / weak-signal / propagation) and 145.8–146 MHz (satellite uplink/downlink) (A). B is the main simplex/voice region you should use; C/D list sub-segments, not the protected edges.
US–China difference: US 2 m also protects 144.0–144.1 (EME) and 145.8–146.0 (satellites); the exact edges match.
Common pitfall: Using the satellite segment 145.8–146 MHz for local FM.
Real on-air practice: Local 2 m FM simplex is 144.0–145.8 MHz; keep clear of the satellite band.
UHF业余无线电台在430MHz频段进行本地联络时应避免占用的频率为：
- A431.9-432.240MHz和435-438MHz
- B430-431.9MHz和432.240-435MHz
- C431-432MHz和438-440MHz
- D430-431.2MHz和435-436MHz
When conducting local contacts on the 430 MHz band, the frequencies a UHF amateur station should avoid occupying are:
- A431.9–432.240 MHz and 435–438 MHz
- B430–431.9 MHz and 432.240–435 MHz
- C431–432 MHz and 438–440 MHz
- D430–431.2 MHz and 435–436 MHz
For local 70 cm work you should avoid 431.9–432.240 MHz (satellite uplink) and 435–438 MHz (satellite downlink) (A). The other options list the usable regions or wrong segments.
US–China difference: US 70 cm satellite uplink is 435–438 MHz and downlink 145 MHz; the protected segments are similar.
Common pitfall: Using 435–438 MHz (satellite downlink) for local FM.
Real on-air practice: 70 cm local FM avoids the 432 MHz and 435–438 MHz satellite segments.
分配给业余业务的某频段的频率下限为F1，业余电台实际可以工作的发信频率应为：
- AF1+信号下边带的频率宽度
- BF1
- CF1-信号下边带的频率宽度
- DF1-2×信号下边带的频率宽度
Where the lower frequency limit of a band allocated to the amateur service is F1, the actual transmit frequency an amateur station may operate at should be:
- AF1 plus the frequency width of the lower sideband
- BF1
- CF1 minus the frequency width of the lower sideband
- DF1 minus twice the frequency width of the lower sideband
For a band with lower edge F1, the transmit carrier must sit at F1 plus the lower-sideband width so the signal’s lower edge stays at/above F1 (A). Placing the carrier at F1 (B) or below (C/D) would push the lower sideband below the band edge.
US–China difference: Same sideband-offset principle applies everywhere SSB is used.
Common pitfall: Forgetting that the carrier, not the lower sideband, is what you tune.
Real on-air practice: On LSB you add the sideband width to the band edge to find the lowest safe dial frequency.
分配给业余业务的某频段的频率上限为F2，业余电台实际可以工作的发信频率应为：
- AF2-信号上边带的频率宽度
- BF2
- CF2+信号上边带的频率宽度
- DF2-2×信号上边带的频率宽度
Where the upper frequency limit of a band allocated to the amateur service is F2, the actual transmit frequency an amateur station may operate at should be:
- AF2 minus the frequency width of the upper sideband
- BF2
- CF2 plus the frequency width of the upper sideband
- DF2 minus twice the frequency width of the upper sideband
For a band with upper edge F2, the carrier must sit at F2 minus the upper-sideband width so the signal’s upper edge stays at/below F2 (A). Placing the carrier at F2 (B) or above (C) would push the upper sideband above the band edge.
US–China difference: Same principle; it is why US 10 m voice stops below 29.7 MHz.
Common pitfall: Dialing exactly to the band edge on USB.
Real on-air practice: On USB you subtract the sideband width from the top edge to find the highest safe dial frequency.
ITU对于5至30MHz短波频段的态度是：
- A鼓励各主管部门在可行时，使用任何其他可能的通信手段，从而防止对远距离无线电通信的有害干扰
- B在保证优先满足本地通信的前提下，允许远距离通信适当使用这一段频率
- C同样鼓励本地和远距离通信尽量使用该段频率，提高这一段频谱的使用率
- D鼓励在这些频段建立大功率中继站，以提高本地通信的覆盖效果
The ITU’s attitude toward the 5–30 MHz short-wave bands is:
- Ato encourage each administration, where practicable, to use any other possible means of communication, thereby preventing harmful interference to long-distance radio communication
- Bto permit long-distance communication to use this segment appropriately, on the premise of guaranteeing priority for local communication
- Cto equally encourage both local and long-distance communication to make the most use of this segment, raising its spectrum utilization
- Dto encourage establishing high-power relay stations in these bands to improve local communication coverage
The ITU Radio Regulations note that the 5–30 MHz bands are particularly suited to long-distance communication and encourage administrations, where practicable, to use other means of communication to avoid harmful interference to that long-distance service (A). B/C/D invert or contradict this policy.
US–China difference: This ITU policy is reflected in both countries’ deference to HF long-distance (DX) use.
Common pitfall: Thinking HF should be maximized for local communication.
Real on-air practice: On 20 m you prioritize working distant stations; local chatter yields.
国际电联规定的确定发射电台辐射功率的原则为：
- A发射电台只应辐射为保证满意服务所必要的功率
- B发射电台应辐射尽量大的功率以提供尽量好的信号质量
- CHF频段发射电台应辐射尽量大的功率，VHF频段发射电台应辐射尽量小的功率
- DVHF/UHF频段发射电台应辐射尽量大的功率，HF频段发射电台应辐射尽量小的功率
The principle laid down by the International Telecommunication Union for determining the radiated power of a transmitting station is:
- Aa transmitting station should radiate only the power necessary to provide a satisfactory service
- Ba transmitting station should radiate the maximum possible power to provide the best possible signal quality
- CHF stations should radiate maximum power and VHF stations minimum power
- DVHF/UHF stations should radiate maximum power and HF stations minimum power
The ITU principle (Radio Regulations, No. 21.1) is that a station should radiate only the minimum power necessary to give a satisfactory service (A). The other options promote maximum power, which is contrary to interference minimization.
US–China difference: FCC Part 97 also requires using the minimum power necessary.
Common pitfall: Thinking “more power is always better.”
Real on-air practice: You start with low power (QRP) and raise it only as needed for the contact.
某俱乐部约定了一个成员业余电台之间交流技术的网络频率，当遇有其他业余电台按通信惯例要求参加通信时，处理原则应为：
- A无条件欢迎加入，因为任何业余电台都对业余无线电频率享有平等使用权
- B要求其他业余电台在任何时间都不得使用俱乐部自行约定的专用通信频率
- C要求其他业余电台在俱乐部成员结束网络通信后再使用该频率
- D由俱乐部网络控制台自行决定其他业余电台是否可以加入通联
A club has arranged a net frequency for its members to exchange technical information. When another amateur station, following normal operating practice, requests to join the communication, the principle of handling it should be:
- Awelcome them unconditionally, because any amateur station enjoys equal use rights to amateur frequencies
- Bdemand that other amateur stations never use the club’s self-arranged “private” frequency at any time
- Crequire other amateur stations to wait until the club members finish the net before using the frequency
- Dlet the club net control decide on its own whether other amateur stations may join
All amateur stations have equal rights to amateur frequencies; a club cannot claim an exclusive “private” frequency, so any station requesting to join must be welcomed (A). B/C/D attempt to grant the club priority or exclusivity, which violates equal-access principle.
US–China difference: Same in the US — nets are on shared frequencies; others may join politely.
Common pitfall: Thinking a club “owns” its net frequency.
Real on-air practice: A visitor may check in to a club net; the net control should accept them.
ITU《无线电规则》禁止所有电台发射下列种类的电波：
- A阻尼波
- B调幅波
- C调频波
- D调相波
The ITU Radio Regulations prohibit all stations from emitting the following kind of wave:
- Adamped waves
- Bamplitude-modulated (AM) waves
- Cfrequency-modulated (FM) waves
- Dphase-modulated (PM) waves
The ITU Radio Regulations prohibit the emission of damped waves (阻尼波) by all stations (A). AM, FM, and PM are all authorized emission types (B/C/D are permitted).
US–China difference: Same: damped-wave (spark) transmitters have been banned internationally since the 1930s.
Common pitfall: Confusing damped waves with ordinary AM.
Real on-air practice: Modern CW/SSB/FM equipment is fully compliant; this rule is historical.
下列哪些违法行为将由无线电管理机构依照《中华人民共和国无线电管理条例》的规定处理：
- A违法使用业余无线电台干扰无线电业务正常进行的
- B向境外组织或者个人提供涉及国家安全的境内电波参数资料
- C擅自编制、使用业余无线电台呼号的
- D故意收发业余无线电台执照载明事项之外的无线电信号，传播、公布或者利用无意接收的信息的
Which of the following illegal acts will be handled by the radio management authority in accordance with the Radio Regulations of the PRC? (Choose all that apply.)
- Aillegally using an amateur radio station to interfere with the normal conduct of radio services
- Bproviding radio-parameter data within the country concerning national security to foreign organizations or individuals
- Carbitrarily devising or using amateur radio call signs
- Dintentionally transmitting or receiving radio signals beyond the particulars recorded in the amateur station license, or disseminating, publishing, or using information inadvertently received
All four are unlawful acts handled under the Radio Regulations of the PRC (《中华人民共和国无线电管理条例》): (A) illegal interference with radio services; (B) leaking national-security radio data abroad; (C) unauthorized devising/use of call signs; (D) transmitting/receiving outside license particulars or misusing inadvertently received information. Each violates the regulation’s prohibitions.
US–China difference: The US FCC similarly prohibits unlicensed/interfering operation and misuse of received communications, though the specific national-security data rule is China-specific.
Common pitfall: Overlooking D — even deliberately using or sharing accidentally received traffic is prohibited.
Real on-air practice: You must not rebroadcast or act on a message you accidentally copy from another service.
业余无线电台使用业余业务频率使用原则：
- A无需取得无线电频率使用许可
- B免收无线电频率占用费
- C需取得无线电频率使用许可
- D需收取无线电频率占用费
The principles for amateur stations using amateur-service frequencies are: (Choose all that apply.)
- Ano radio-frequency use license is required
- Bradio-frequency occupancy fees are exempted
- Ca radio-frequency use license must be obtained
- Dradio-frequency occupancy fees must be charged
When using amateur-service frequencies, an amateur station needs no radio-frequency use license and is exempt from frequency occupancy fees (A, B). C and D are the opposite of the preferential treatment granted to amateur radio.
US–China difference: In the US there is also no per-frequency license or occupancy fee for amateur bands.
Common pitfall: Assuming amateur use still requires a separate frequency license and fee.
Real on-air practice: You operate on amateur bands without paying spectrum fees.
我国《无线电频率划分规定》划分给业余业务使用的最低频段为135.7-137.8kHz，属于无线电频谱的下列频段（波段）：
- A低频（长波）
- B甚低频（甚长波）
- C特低频（特长波）
- D超低频（超长波）
The lowest band allocated by our country’s Radio Frequency Allocation Regulations to the amateur service is 135.7–137.8 kHz; this belongs to the following radio-spectrum band (waveband):
- Alow frequency (LF / long wave)
- Bvery low frequency (VLF / very long wave)
- Cultra low frequency (ULF / ultra long wave)
- Dsuper low frequency (SLF / super long wave)
135.7–137.8 kHz lies in the low-frequency (低频/LF, also called 长波 long wave) band, 30–300 kHz (A). VLF is 3–30 kHz, so B is wrong; C/D are not standard amateur-designated bands here.
US–China difference: Same LF definition internationally; the US has no amateur LF allocation.
Common pitfall: Confusing LF (30–300 kHz) with VLF (3–30 kHz).
Real on-air practice: 137 kHz is a narrow experimental CW band for long-wave enthusiasts.
我国《无线电频率划分规定》划分给业余业务使用的1,800kHz-2,000kHz属于无线电频谱的下列频段（波段）：
- A中频（中波）
- B甚高频（米波）
- C低频（长波）
- D高频（短波）
The 1,800 kHz–2,000 kHz allocated by our country’s Radio Frequency Allocation Regulations to the amateur service belongs to the following radio-spectrum band (waveband):
- Amedium frequency (MF / medium wave)
- Bvery high frequency (VHF / metric wave)
- Clow frequency (LF / long wave)
- Dhigh frequency (HF / short wave)
1800–2000 kHz (the 160 m band) is in the medium-frequency (中频/MF, 中波 medium wave) range, 300 kHz–3 MHz (A). LF is below 300 kHz and HF starts at 3 MHz, so C/D are wrong; B is VHF which is far higher.
US–China difference: Same MF band; the US 160 m is also MF.
Common pitfall: Mistaking 160 m for HF because it is an “amateur HF band” by convention.
Real on-air practice: Despite being called “HF” by hams, 1.8 MHz is technically MF.
我国《无线电频率划分规定》划分给业余业务使用的28MHz-29.7MHz属于无线电频谱的下列频段（波段）：
- A高频（短波）
- B中频（中波）
- C甚高频（米波）
- D低频（长波）
The 28 MHz–29.7 MHz allocated by our country’s Radio Frequency Allocation Regulations to the amateur service belongs to the following radio-spectrum band (waveband):
- Ahigh frequency (HF / short wave)
- Bmedium frequency (MF / medium wave)
- Cvery high frequency (VHF / metric wave)
- Dlow frequency (LF / long wave)
28–29.7 MHz (the 10 m band) is in the high-frequency (高频/HF, 短波 short wave) range, 3–30 MHz (A). MF is below 3 MHz and VHF starts at 30 MHz, so B/C/D are wrong.
US–China difference: Same HF band definition; 10 m is HF in both.
Common pitfall: Confusing 10 m (HF) with 6 m / 2 m (VHF).
Real on-air practice: 10 m uses skywave propagation like the rest of HF.
我国《无线电频率划分规定》划分给业余业务使用的50MHz-54MHz属于无线电频谱的下列频段（波段）：
- A甚高频（米波）
- B高频（短波）
- C超高频（厘米波）
- D特高频（分米波）
The 50 MHz–54 MHz allocated by our country’s Radio Frequency Allocation Regulations to the amateur service belongs to the following radio-spectrum band (waveband):
- Avery high frequency (VHF / metric wave)
- Bhigh frequency (HF / short wave)
- Csuper high frequency (SHF / centimetric wave)
- Dultra high frequency (UHF / decimetric wave)
50–54 MHz (the 6 m band) is in the very-high-frequency (甚高频/VHF, 米波 metric wave) range, 30–300 MHz (A). HF is below 30 MHz; UHF/SHF are above 300 MHz, so B/C/D are wrong.
US–China difference: Same VHF definition; 6 m is VHF in both.
Common pitfall: Mixing up the Chinese band nicknames (米波=VHF, 分米波=UHF).
Real on-air practice: 6 m is the lowest VHF amateur band, with line-of-sight and sporadic-E propagation.
我国《无线电频率划分规定》划分给业余业务使用的最接近无线宽带WiFi 频率的频段为2,300-2,450MHz，属于无线电频谱的下列频段（波段）：
- A特高频（分米波）
- B甚高频（米波）
- C高频（短波）
- D超高频（厘米波）
The band allocated by our country’s Radio Frequency Allocation Regulations to the amateur service that is closest to the wireless broadband WiFi frequency, 2,300–2,450 MHz, belongs to the following radio-spectrum band (waveband):
- Aultra high frequency (UHF / decimetric wave)
- Bvery high frequency (VHF / metric wave)
- Chigh frequency (HF / short wave)
- Dsuper high frequency (SHF / centimetric wave)
2300–2450 MHz (the 2.3 GHz / 13 cm amateur band, near WiFi/ISM) is in the ultra-high-frequency (特高频/UHF, 分米波 decimetric wave) range, 300 MHz–3 GHz (A). VHF is below 300 MHz and SHF (厘米波) starts at 3 GHz, so B/D are wrong; C is HF.
US–China difference: The US 2.3 GHz (2300–2310 / 2390–2450 MHz) band is also UHF; 13 cm is a popular ATV/microwave band.
Common pitfall: Confusing 分米波 (UHF, ≤3 GHz) with 厘米波 (SHF, ≥3 GHz).
Real on-air practice: 2.4 GHz amateur ATV and digital modes share proximity with WiFi/ISM users.
430-440MHz业余频段与公众对讲机的工作频率最为接近。如果业余无线电爱好者希望通过改变业余电台的配置，将之”扩频”并与公众对讲机持有者通信，则需注意：
- A业余电台不能与公众对讲机通信
- B将业余电台设置到公众对讲机的频率，以不大于业余电台执照核定的发射功率与之通信
- C将业余电台设置到公众对讲机的频率，以不大于0.5W的发射功率与之通信
- D将业余电台设置到公众对讲机的频率，但只能进行由业余电台到公众对讲机的单向发信
The 430–440 MHz amateur band is closest to the operating frequencies of public walkie-talkies (citizen-band radios). If an amateur wishes to modify the amateur station configuration to “extend” it and communicate with public walkie-talkie users, they should note:
- Aan amateur radio station may not communicate with public walkie-talkies
- Bset the amateur station to the public walkie-talkie frequency and communicate at no more than the transmit power authorized on the amateur station license
- Cset the amateur station to the public walkie-talkie frequency and communicate at no more than 0.5 W transmit power
- Dset the amateur station to the public walkie-talkie frequency, but only one-way transmission from the amateur station to the walkie-talkie is allowed
An amateur station may only communicate within the amateur service; communicating with public walkie-talkie (citizen-band) users is outside the amateur service and is prohibited (A). B/C/D all wrongly assume such cross-service communication is permissible under some power limit.
US–China difference: In the US, amateur stations likewise may not talk to FRS/GMRS (citizen) radios — that requires a different service.
Common pitfall: Thinking a power limit makes cross-service contact legal.
Real on-air practice: A ham on 70 cm cannot chat with a family on FRS walkie-talkies.
我国《无线电频率划分规定》划分给业余业务使用的最接近Wi-Fi局域网频率的频段为2,300-2,450MHz，属于无线电频谱的下列频段（波段）：
- AUHF
- BVHF
- CHF
- DSHF
The band allocated by our country’s Radio Frequency Allocation Regulations to the amateur service that is closest to the WiFi LAN frequency, 2,300–2,450 MHz, belongs to the following radio-spectrum band:
- AUHF
- BVHF
- CHF
- DSHF
2300–2450 MHz is UHF (ultra high frequency, 300 MHz–3 GHz) (A). VHF is below 300 MHz, HF below 30 MHz, and SHF starts at 3 GHz.
US–China difference: Same UHF classification; the US 13 cm band (2.3 GHz) is UHF too.
Common pitfall: Picking SHF because 2.4 GHz “sounds microwave-high.”
Real on-air practice: 2.4 GHz amateur links sit in UHF alongside WiFi/ISM devices.
我国《无线电频率划分规定》划分给业余业务使用的最接近C波段卫星电视广播频率的频段是5.650-5.850GHz，属于无线电频谱的下列频段（波段）：
- A超高频（厘米波）
- B特高频（分米波）
- C极高频（毫米波）
- D甚高频（米波）
The band allocated by our country’s Radio Frequency Allocation Regulations to the amateur service that is closest to the C-band satellite TV broadcast frequency, 5.650–5.850 GHz, belongs to the following radio-spectrum band (waveband):
- Asuper high frequency (SHF / centimetric wave)
- Bultra high frequency (UHF / decimetric wave)
- Cextremely high frequency (EHF / millimetric wave)
- Dvery high frequency (VHF / metric wave)
5.65–5.85 GHz (the 5 cm amateur band) is in the super-high-frequency (超高频/SHF, 厘米波 centimetric wave) range, 3–30 GHz (A). UHF ends at 3 GHz and EHF starts at 30 GHz, so B/C/D are wrong.
US–China difference: Same SHF classification; the US 5 cm (5.65–5.925 GHz) band is SHF.
Common pitfall: Confusing 厘米波 (SHF, ≥3 GHz) with 分米波 (UHF, ≤3 GHz).
Real on-air practice: 5 cm is a popular EME (moonbounce) and troposcatter microwave band.
我国《无线电频率划分规定》划分给业余业务使用的最接近Ku波段卫星电视广播频率的频段10-10.5GHz，属于无线电频谱的下列频段（波段）：
- A超高频（厘米波）
- B特高频（分米波）
- C极高频（毫米波）
- D甚高频（米波）
The band allocated by our country’s Radio Frequency Allocation Regulations to the amateur service that is closest to the Ku-band satellite TV broadcast frequency, 10–10.5 GHz, belongs to the following radio-spectrum band (waveband):
- Asuper high frequency (SHF / centimetric wave)
- Bultra high frequency (UHF / decimetric wave)
- Cextremely high frequency (EHF / millimetric wave)
- Dvery high frequency (VHF / metric wave)
10–10.5 GHz (the 3 cm amateur band) is SHF (超高频/厘米波, 3–30 GHz) (A). UHF ends at 3 GHz and EHF begins at 30 GHz, so B/C/D are wrong.
US–China difference: Same SHF; the US 3 cm (10.0–10.5 GHz) band is SHF.
Common pitfall: Mixing up the SHF/UHF boundary at 3 GHz.
Real on-air practice: 3 cm is used for high-speed digital microwave and EME.
我国《无线电频率划分规定》划分给业余业务使用的最高频段为241GHz-250GHz，属于无线电频谱的下列频段（波段）：
- A极高频（毫米波）
- B超高频（厘米波）
- C至高频（丝米波或亚毫米波）
- D特高频（分米波）
The highest band allocated by our country’s Radio Frequency Allocation Regulations to the amateur service is 241 GHz–250 GHz, which belongs to the following radio-spectrum band (waveband):
- Aextremely high frequency (EHF / millimetric wave)
- Bsuper high frequency (SHF / centimetric wave)
- Ctremendously high frequency (THF / sub-millimetric wave)
- Dultra high frequency (UHF / decimetric wave)
241–250 GHz is in the extremely-high-frequency (极高频/EHF, 毫米波 millimetric wave) range, 30–300 GHz (A). SHF ends at 30 GHz, UHF at 3 GHz, and THF (至高频) begins above 300 GHz, so B/C/D are wrong.
US–China difference: Same EHF classification; the US 241–250 GHz band is also EHF.
Common pitfall: Confusing the SHF/EHF boundary at 30 GHz.
Real on-air practice: 240 GHz is the extreme top of the amateur allocation, used by advanced microwave experimenters.
💬 Have questions about this topic, or FCC / CRAC exam preparation?
对本篇内容或 FCC / CRAC 备考有疑问？
本手册仅供业余无线电爱好者学习交流，题库原题版权归 CRAC（中国无线电协会业余无线电分会）所有，英文翻译由 BG7BAG 编译，转载请注明出处。
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