An amateur radio repeater is an electronic device that receives a weak or low-level amateur radio signal and retransmits it at a higher level or higher power, so that the signal can cover longer distances without degradation. Many repeaters are located on hilltops or on tall buildings as the higher locations increases their coverage area, sometimes referred to as the radio horizon, or “footprint”. Amateur radio repeaters are similar in concept to those used by public safety entities (police, fire department, etc.), businesses, government, military, and more. Amateur radio repeaters may even use commercially packaged repeater systems that have been adjusted to operate within amateur radio frequency bands, but more often amateur repeaters are assembled from receivers, transmitters, controllers, power supplies, antennas, and other components, from various sources.

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Map developed by Steve Kawamae, KH6WG
The map above can be found at: and shows most repeaters on Oahu.

The Emergency Amateur Radio Club (EARC) currently has two club owned repeaters. The Diamond Head repeater uses the EARC Club callsign but the hardware is owned by the Hawaii Department of Emergency Management.

146.800- (PL 88.5) Repeater: Maunakapu (EARC Repeater)
146.660-(PL88.5) Repeater: Olomana (EARC Repeater)

The EARC 146.800 Maunakapu and the 146.660 Olomana repeaters are linked.

What does it mean when we say a repeater is linked?

In some areas multiple repeaters are linked together to form a wide-coverage network, the Western Intertie Network, or the WIN System as it is called, is a good example of a wide coverage linked repeater network.

The WIN System is a series of over 100 linked, or Inter-tied repeaters; most are UHF repeaters, but some have some 2-meter and 220 repeaters as well, that cover a great deal of California, 16 States, and four Countries around the world.

Oahu had a linked system until recently. With the Missile Threat security of systems has been tightened and some of the linked repeaters belonged to the EARC Club, some to the DEM. So the EARC and DEM link has been suspended for now. When it was working it provided coverage nearly all over Oahu.