E1C: Automatic and Remote Control

E1C covers FCC rules for automatic and remote control of amateur stations, several band-specific technical limits, rules for communicating with stations in foreign countries, and the two international operating agreements that allow US amateurs to operate abroad and foreign amateurs to operate in the US.

This group also addresses the 2200-meter and 630-meter band notification requirements, third-party traffic rules under automatic control, and the data bandwidth limit on 60 meters.

Remote Control and Link Failure

When an amateur station is being operated by remote control (the control operator is not physically present at the transmitter), the station must be capable of being shut down if the control link fails. If the control link does malfunction, the station's transmissions may continue for a maximum of 3 minutes before the station must automatically terminate. This 3-minute limit is a specific, testable fact — not 30 seconds, 5 minutes, or 10 minutes.

The requirement ensures that a remote station cannot continue transmitting indefinitely if contact with the control point is lost. The station's design must incorporate a mechanism to shut down automatically after 3 minutes without control link contact.

Automatic Control and Third-Party Traffic

Under automatic control (where neither the control operator nor any other person monitors or adjusts the station), there is a restriction on third-party traffic. A station operating under automatic control may transmit third-party communications only when transmitting RTTY or data emissions. It may not relay third-party voice or image traffic under automatic control. This limitation reflects the regulatory premise that automated relay of non-data traffic creates accountability problems that require human control.

60-Meter Data Bandwidth Limit

On the 60-meter channelized band, data emissions are permitted, but the maximum bandwidth for a data signal is 2.8 kHz. This is the same width as an SSB phone signal — data emissions on 60 meters must fit within the same channel footprint as phone. Wider data signals are not authorized on this band.

Communications with Foreign Countries

Amateur communications with stations in foreign countries must be limited to those incidental to the purpose of the amateur service and remarks of a personal nature. Business communications, political advocacy, and commercial traffic are not permitted even when directed to amateurs in other countries. Transmissions do not need to be in English — other languages are permitted — and there is no requirement for government or NGO emergency content only.

LF Band UTC Notification

Before transmitting on the 630-meter or 2200-meter bands, amateur operators must notify the Utilities Technology Council (UTC) of their call sign and the coordinates of their station. The UTC manages power-line carrier (PLC) systems that operate on these low frequencies.

After filing this notification, operators must wait 30 days before beginning operation — unless they have been notified during that period that their station is located within 1 kilometer of PLC systems using those frequencies. If the UTC indicates that the station is too close to PLC infrastructure, the amateur must not operate until the conflict is resolved. If no such notice is received within 30 days, operation may begin.

IARP and CEPT International Operating Agreements

Two formal international operating agreements allow US amateur operators to operate abroad and allow foreign operators to use their home license in the US.

Note that CEPT and IARP are distinct — the CEPT agreement handles transatlantic reciprocal operation, while IARP handles operations within the Western Hemisphere. An ITU reciprocal license is a different mechanism and is not the same as CEPT.

Angle Modulation Index Below 29 MHz

For angle-modulated emissions (FM or phase modulation) operating below 29.0 MHz, the highest modulation index permitted at the highest modulation frequency is 1.0. This limit restricts the bandwidth of FM and PM signals in the HF bands to prevent excessive spectrum occupancy. At higher modulation indices, the signal spreads across a wider bandwidth and could cause interference to adjacent frequencies.

Spurious Emission Limit Below 30 MHz

Below 30 MHz, the maximum mean power of any spurious emission must not exceed −43 dB relative to the fundamental emission. This means spurious products — harmonics, intermodulation products, and other unintentional outputs — must be at least 43 dB below the transmitter's fundamental output power. The limit is −43 dB, not −53, −63, or −73 dB.

Phone Emissions on 630 Meters

Phone emissions are permitted throughout the entire 630-meter band allocation. Unlike some other newer amateur allocations that restrict certain modes to specific portions of the band, the 630-meter band does not impose a sub-band restriction on phone. Operators may use phone (voice) modes across the full bandwidth of the 630-meter band.

E1C Practice Questions