CRAC Class B (2025) — Questions 91–100

The NCDXF/IARU (Northern California DX Foundation / International Amateur Radio Union) beacon network includes a Chinese beacon with the call sign VR2B (Hong Kong). BS7H is the Huangyan Island (Scarborough) coral-island activation, B0CRA is a China Radio Association special-event call, and 4U1UN is the UN station in New York — none is the Chinese NCDXF/IARU beacon.

In China's call-sign plan the prefix "BJ" is assigned to space (satellite) amateur stations, so BJ1 is a space-station prefix and is therefore NOT selected. The prefixes BY, BR and BS are used for ordinary ground-based or other amateur stations and do NOT denote space stations, so A, B and C are the correct "does not belong" choices. 业余无线电台的法定设置与使用 Lawful Establishment and Operation of Stations

The lawful path is to apply to the radio management authority under the Measures and obtain a radio station license (A). Joining an association, association approval, or employer/neighborhood approval are not the legal requirement (B, C, D wrong).

By law an amateur radio station is for intercommunication, technical research, and self-training (A) — the ITU definition of the amateur service. Personal, entertainment, or vehicle-safety use (B, C, D) is not its statutory purpose.

Multiple devices at one station count as a single station with one call sign, but every device must be inspected and its parameters recorded in the license (A). Inspecting only one device (B, D) or giving each device its own call sign (C) is wrong.

A repeater must have a responsible monitor/manager, effective remote control, and the ability to stop transmitting promptly if it causes harmful interference (A). Encryption to restrict use (B), cranking up power to override others (C), and hot-standby (D) are not the required measure and some are contrary to amateur principles.

An amateur repeater must serve all amateurs in coverage equally and publish its parameters (A). Restricting to permitted users (B), member-priority (C), or charging fees (D) violates the equal-service principle.

Repeater offsets follow the amateur standard: +/−600 kHz on 2 m (144 MHz) and +/−5 MHz on 70 cm (430 MHz) (A). Non-standard offsets to exclude users (B), changing offsets (C), or arbitrary selection (D) are not the principle.

Equipment must be compliant: commercial gear needs type approval covering amateur bands (A), and homebrew/modified gear must meet national standards and stay within amateur bands (B). Unrestricted homebrew (C) and "foreign gear just needs international standards" (D) are wrong — China requires its own type approval.

The statement is wrong (A): establishing a station requires being familiar with radio regulations, and an amateur station may only be operated for its statutory purpose by qualified persons. Personal "driving convenience" is not a basis to ignore the rules. B/C/D wrongly excuse non-compliance.