9 cm band
Privileges
E, G, T
Legend
Data, RTTY, and CW
Phone, image, and CW
Operations suspended
Typical phone mode
FM, USB
These mode(s) are commonly used for voice on this band. Most bands allow other modes, as well (see restrictions).
Restrictions
The FCC has decodified this band and permanently suspended amateur operations in the 3.45-3.5 GHz segment. The FCC is allowing amateur operations in the 3.3-3.45 GHz segment on a secondary basis. Because this band was decodified, the regulations below may not be valid. Please review the applicable laws and the ARRL's guidance before operating in the 9 cm band.
Amateur stations transmitting on the 3.3-3.4 GHz segment must not cause harmful interference to, and must accept interference from, stations authorized by other nations in the radiolocation service.
§97.303(d)
Amateur stations transmitting in the 9 cm band must not cause harmful interference to, and must accept interference from, stations authorized by the United States Government in the radiolocation service.
§97.303(b) Outdated
Amateur stations transmitting on the 3.332-3.339 GHz segment and the 3.3458-3.3525 GHz segment must must not cause harmful interference to radio astronomy stations.
§97.303(f) Outdated
Amateur stations transmitting on the 3.4-3.5 GHz segment must not cause harmful interference to, and must accept interference from, stations authorized by other nations in the fixed and fixed-satellite (space-to-Earth) services.
§97.303(q) Outdated
On the 9 cm band, a RTTY, data or multiplexed emission using a specified digital code listed in §97.309(a) of this part or an unspecified digital code under the limitations listed in §97.309(b) of this part may be transmitted.
§97.307(f)(7) and §97.305(c) Outdated
The 5-unit, start-stop, International Telegraph Alphabet No. 2, code defined in ITU-T Recommendation F.1, Division C (commonly known as "Baudot"); The 7-unit code specified in ITU-R Recommendations M.476-5 and M.625-3 (commonly known as "AMTOR"); The 7-unit, International Alphabet No. 5, code defined in IT--T Recommendation T.50 (commonly known as "ASCII"); An amateur station transmitting a RTTY or data emission using a digital code specified in this paragraph may use any technique whose technical characteristics have been documented publicly, such as CLOVER, G-TOR, or PacTOR, for the purpose of facilitating communications.
§97.309(a) Outdated
On the 9 cm band, a station may transmit a RTTY or data emission using an unspecified digital code, except to a station in a country with which the United States does not have an agreement permitting the code to be used. RTTY and data emissions using unspecified digital codes must not be transmitted for the purpose of obscuring the meaning of any communication. When deemed necessary by a District Director to assure compliance with the FCC Rules, a station must: Cease the transmission using the unspecified digital code; Restrict transmissions of any digital code to the extent instructed; Maintain a record, convertible to the original information, of all digital communications transmitted.
§97.309(b) Outdated
Amateur stations on the 9 cm band may transmit a RTTY or data emission having designators with A, B, C, D, E, F, G, H, J or R as the first symbol; 1, 2, 7, 9 or X as the second symbol; and D or W as the third symbol is also authorized.
§97.307(f)(8) and §97.305(c) Outdated
Spread spectrum emissions are authorized on the 9 cm band with a maximum of 10 W PEP.
§97.305(c) and §97.313(h) Outdated
F8E emissions (Multi-Channel FM Voice) may be transmitted on the 9 cm band.
§97.305(c) and §97.305(f)(12) Outdated
MCW emissions may be transmitted on the 9 cm band.
§97.305(c) Outdated
Test emissions may be transmitted on the 9 cm band.
§97.305(c) Outdated
Pulse emissions may be transmitted on the 9 cm band.
§97.305(c) Outdated
Band plan
Analog & Digital; paired with 3.43-3.439 GHz; 130 MHz Split; Emission Bandwidth is 0.1-1 MHz
3.3 - 3.309 GHz
Experimental
3.309 - 3.31 GHz
Analog & Digital; paired with 3.41-3.43 GHz; 100 MHz Split; Emission Bandwidth is 1 MHz or more
3.31 - 3.33 GHz
Experimental
3.332 - 3.339 GHz
RADIO ASTRONOMY PROTECTED BAND
3.332 - 3.339 GHz
Analog & Digital; paired with 3.439-3.4458 GHz; 100 MHz Split; Emission Bandwidth is 0.1-1 MHz
3.339 - 3.3458 GHz
RADIO ASTRONOMY PROTECTED BAND
3.3458 - 3.3525 GHz
Analog & Digital; paired with 3.4525-3.455 GHz; 100 MHz Split; Emission Bandwidth is 50-200 kHz
3.3525 - 3.355 GHz
Experimental
3.355 - 3.357 GHz
Analog & Digital; paired with 3.457-3.46 GHz; Emission Bandwidth is 50 kHz or less
3.357 - 3.36 GHz
Broadband Modes; Emission Bandwidth is 22 MHz or less
3.36 - 3.4 GHz
ATV
3.36 - 3.38 GHz
Amateur Satellite Communications; Emission Bandwidth is 6 kHz or less
3.4 - 3.41 GHz
EME Calling Frequency; Emission Bandwidth is 3 kHz or less
3.4001 GHz
Weak Signal EME Band; Emission Bandwidth is 3 kHz or less
3.4 - 3.4003 GHz
Terrestrial Weak Signal Band; Emission Bandwidth is 3 kHz or less
3.4003 - 3.401 GHz
Analog & Digital; paired with 3.31-3.33 GHz; 100 MHz Split; Emission Bandwidth is 1 MHz or more
3.41 - 3.43 GHz
Analog & Digital; paired with 3.300-3.309 GHz; 130 MHz Split; Emission Bandwidth is 0.1-1 MHz
3.43 - 3.439 GHz
Analog & Digital; paired with 3.339-3.3458 GHz; 100 MHz Split; Emission Bandwidth is 0.1-1 MHz
3.439 - 3.4458 GHz
Experimental
3.4458 - 3.45 GHz