Collins 207B-1 Transmitter

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Collins 207B in the transmitting room aboard the USCG Courier.

The Collins 207B-1 was a radio transmitter manufactured in 1951 by Collins Radio Company.


The 207B-1 was capable of 35 kilowatts of RF output in amplitude modulation mode, and 50 kilowatts in continuous wave mode. The transmitter was designed for land-based operation within the frequencies of 4 to 26 MHz and was contained within five sheet metal cabinets bolted together to form a single unit with a weight of 16,800 pounds. Intended primarily for high speed telegraphy and broadcasting, the 207B-1 was capable of high power AM transmission and telegraphic or frequency-shift keying at speeds greater than 400 words per minute. It could also be used to amplify the power output of a single-sideband modulation transmitter to a peak envelope power of 30 kilowatts.[1][2]


In April 1951 the United States Coast Guard Cutter USCGC Courier was equipped with two 207B-1 transmitters during its time as a ship-borne radio relay station to transmit Voice of America programs behind the Iron Curtain.[3][4]


  1. ^ Maes, Ludo. TDP COLLINS 207B-1 GENERAL DESCRIPTION. TDP. 2010-06-04. URL: Accessed: 2010-06-04. (Archived by WebCite at
  2. ^ Unclassified publications of Lincoln Laboratory, 1951
  3. ^ U.S. Coast Guard Cutter Courier. United States Coast Guard. 2010-06-04. URL: Accessed: 2010-06-04. (Archived by WebCite at
  4. ^ "Voice of America Broadcasts From Coast Guard Cutter". Modesto Radio Museum. Retrieved 16 November 2010.