The U.S. Naval Radio Station Tarlac

The U.S. Naval Radio Station, Tarlac, also known as the U.S. Naval Radio Transmitter Facility, Capas, Tarlac, was a remote unit of the U.S. Naval Communication Station Philippines (NavComStaPhil), located at 15.354114 deg north latitude, 120.536048 deg east longitude, near the town of Capas, Tarlac Province, Luzon, Republic of the Philippines. The sole, purpose of the station was to provide short-wave radio transmission capability for its parent communication station, that is, to be the radio voice for NavComStaPhil. It provided wide-area radio broadcasts, as well as dedicated, point-to-point radio transmissions to individual U.S. Navy ships in the vicinity of the Philippine Islands.

The station was operated and maintained by a combined workforce of U.S. Navy personnel, U.S. Marines, U.S. civilian contractors, and Filipino personnel.

The station comprised 1,937 acres. The core of its transmission capability was located in two transmitter buildings. The primary building, referred to as "Main Deck", housed a large number of high power, high frequency (HF) transmitters. It also housed microwave radio-relay equipment for reception and distribution of data received from the NavComStaPhil for subsequent short-wave radio transmission. The secondary transmitter building, referred to as "Bull Horn", housed a smaller number of transmitters, but with similar capabilities to those at Main Deck. Additionally, the Bull Horn site held the S-500 transmitter trailer. The S-500, known affectionately as "Big Sam", was a high power, low frequency (LF) transmitter dedicated for fleet broadcast, capable of generating 500 kW of broadcast signal power. Radio transmitters employed at both sites were in the category of high-power output, meaning, they generated radio signal powers in the range from a few kilowatts (kW) to several 10's of kW, but the majority of transmitters operated at either 10 kW or 40 kW. A large number and variety of LF and HF antennas were used at both transmitter sites. These included directional (beam antennas), omnidirectional antennas, and tall antenna towers for dedicated, wide-area broadcast capability.

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