T1F: Frequency selection and sharing; transmitter power; digital communications

If the FCC rules say that the amateur service is a secondary user of a frequency band, and another service is a primary user, amateurs are allowed use only if they do not cause harmful interference to the primary users

If two amateur stations want to use the same frequency, both station operators have an equal right to operate on the frequency.

If a repeater is causing harmful interference to another repeater and a frequency coordinator has recommended the operation of one repeater only, only the licensee of the unrecommended repeater is responsible for resolving the interference.

If a repeater is causing harmful interference to another amateur repeater and a frequency coordinator has recommended the operation of both repeaters, both repeater licensees are responsible for resolving the interference.


The term used for the average power supplied to an antenna transmission line during one RF cycle at the crest of the modulation envelope is Peak Envelope Power (PEP).

The maximum transmitting power permitted an amateur station on 146.52 MHz is 1500 watts PEP output. A Technician licensee who has passed a Morse code exam, may use up to 200 watts PEP output power on the 80, 40, 15, and 10 meter bands. (see table in T1B-C).

Amateur stations must use the minimum legal power necessary to communicate at all times.


The FCC uses the name, data, for telemetry, telecommand or computer communications emissions. It uses the name, RTTY, for narrow-band direct-printing telegraphy emissions. The maximum symbol rate permitted for packet transmissions, RTTY or data transmissions on the 6- or 2-meter bands is 19.6 kilobaud.