The Navy Electricity and Electronics Training Series Module 17 Radio Frequency Communications Principles : United States. Navy : Free Download, Borrow, and Streaming : Internet Archive
![SWLD - Shortwave Listeners Delight - HFGCS USA High Frequency Global Communication System Frequencies SWLD - Shortwave Listeners Delight - HFGCS USA High Frequency Global Communication System Frequencies](http://www.swld.com.au/images/HFGCS_winter.jpg)
SWLD - Shortwave Listeners Delight - HFGCS USA High Frequency Global Communication System Frequencies
NRL conducts first test of solar power satellite hardware in orbit > U.S. Naval Research Laboratory > NRL News
![File:US Navy 041207-N-5362F-304 Sailors use high frequency radios and couplers aboard USS Shiloh (CG 67) to talk with other ships in the USS Abraham Lincoln (CVN 72) Carrier Strike Group (CSG).jpg - File:US Navy 041207-N-5362F-304 Sailors use high frequency radios and couplers aboard USS Shiloh (CG 67) to talk with other ships in the USS Abraham Lincoln (CVN 72) Carrier Strike Group (CSG).jpg -](https://upload.wikimedia.org/wikipedia/commons/b/bf/US_Navy_041207-N-5362F-304_Sailors_use_high_frequency_radios_and_couplers_aboard_USS_Shiloh_%28CG_67%29_to_talk_with_other_ships_in_the_USS_Abraham_Lincoln_%28CVN_72%29_Carrier_Strike_Group_%28CSG%29.jpg)