High Frequency Radio Equipment
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NRL's development of radio equipment such as quartz crystal frequency control, high-power transmitters, and receivers led to the adoption and extensive use of high frequency (HF) by the Navy and had a profound effect on Naval communications for the next 50-60 years. NRL's HF radio equipment enabled the following achievements:
- The NRL-developed HF transmitter and receiver was carried by the Navy's dirigible USS Shenandoah during its transcontinental trip in 1924. This equipment accomplished the unusual feat of remaining in communication with NRL throughout the entire trip.
- An NRL HF crystal-controlled transmitter communicated directly with the flagship, USS Seattle, during the cruise of the Fleet to Australia in 1925.
- NRL maintained regular communications with the Antarctic base and support ships of Commander R.E. Byrd's expedition to the South Pole in 1929. The base and ships were equipped with radio gear designed and fabricated by NRL.