ARRL 9 cm Band Plan Updated

Outside of ITU Region 1, the Amateur Satellite Service has a 9cm band allocation of 3.400 GHz – 3.410 GHz on a non-interfering basis. No current satellites are active on this frequency range at present. The new band plan reserves allocations for EME and amateur satellite operation.

The detailed graphic of the 9 cm band plan and accompanying article is posted on the ARRL web at:

In ARRL Bulletin 14 ARLB014, released on June 5 the report reads:

The ARRL Board of Directors has unanimously voted to approve the 9cm band plan, as presented by the ARRL UHF/Microwave Band Plan Committee. Earlier this year, the committee asked radio amateurs for comments on a proposed 9 cm band plan, explaining that the purpose of these band plans is to share information about how the amateur bands are being used and to suggest compatible frequency ranges for various types of application. The committee also recognized that local conditions or needs may necessitate deviations from a band plan, and that regional frequency coordinating bodies may recommend alternatives for use in their respective regions.

The new 9 cm band plan includes the following notations:

* This band plan includes all other emission modes authorized in the 9 cm amateur band whose necessary bandwidth does not exceed the suggested bandwidths listed.

* Weak Signal Terrestrial legacy users are encouraged to move to 3400.3-3401.0 MHz, as time and resources permit.

* Broadband segments may be used for any combination of high-speed data (e.g. 802.11 protocols), Amateur Television and other high-bandwidth activities. Division into channels and/or separation of uses within these segments may be done regionally, based on need and usage.

* Per ITU RR 5.149 from WRC-07, these band segments are also used for Radio Astronomy.  Amateur use of these frequencies should be first coordinated with the National Science Foundation.

Source AMSAT News Service ANS

A global Amateur-Satellite Service allocation at 3400-3410 is one of the objectives of the IARU.

Use of Amateur Satellite Frequencies by Olympic and Paralympic Games

The Olympic and Paralympic Games will be using almost half of the 430 MHz amateur radio allocation as well as segments of 2.3 GHz and 3.4 GHz during the period June 28 to September 23.

The impact on the Amateur-satellite Service 435-438 MHz allocation has been restricted to 436.25-437.25 MHz. It is understood that the equipment being used in the 430 MHz band will include handheld FM rigs at the hotels, the routes to the venues and the venues themselves.

The UK communications regulator Ofcom has provided details of the areas that need to be protected from RF within the designated frequency ranges. Ofcom say: Use of radio by Amateurs in the areas defined in Annexes A and B below could cause interference to Games applications; it is also possible that higher power transmissions from outside these areas could cause interference. Consequently, to avoid the risk of interference to Games applications, Ofcom request that Amateurs do not operate within the frequency ranges identified in the areas defined in Annexes A and B, and that Amateurs ensure that any signals that could be received in these areas are negligible.

Individual Amateurs should assess if their transmission is likely to be received in the defined areas and if in any doubt please DONT operate within the frequency ranges identified.

This indicates that the specified frequency ranges should be avoided for a considerable distance outside the designated zones. Clearly a well equipped station on a good site 75 km from the edge of a zone could still put a signal into that area.

Ofcom also say: There are a number of Amateur contests that fall within the period of the 2012 Games. We can accommodate these providing the Amateur activity is kept to the dates of 6th – 8th July, 4th – 5th August, 14th August and 11th September.

The wideband OMEGA Time Distance system will be used by the sailing vessels taking part in the events at Weymouth. When the system was first tested in August 2011 it operated across the 430 MHz band and it was noted that the repeater GB3SD suffered interference while the trials were taking place. See the South Dorset Repeater Group log at It is understood that for the Games this year OMEGA will be using a different frequency band.

Annex A: Areas in which 431-432 MHz, 432-433 MHz paired with 436.25-437.25 MHz and 438-439 MHz need to be protected for Games use.

Annex B: Areas in which 2.39 – 2.4 GHz and 3.41 – 3.44 GHz need to be protected for Games use.

Annex C: Details of some other changes and restrictions that will apply to repeaters and RAYNET use.

Ofcom Statement

RSGB Olympic and Paralympic Games information