Collins 207B-1 Transmitter

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.

Specifications

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]

Usage

In April of 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]

References

1. ^ Maes, Ludo. TDP COLLINS 207B-1 GENERAL DESCRIPTION. TDP. 2010-06-04. URL:http://www.transmitter.be/col-207b1.html. Accessed: 2010-06-04. (Archived by WebCite at http://www.webcitation.org/5qEpTCJ1b)
2. ^ Unclassified publications of Lincoln Laboratory, 1951
3. ^ U.S. Coast Guard Cutter Courier. United States Coast Guard. 2010-06-04. URL:http://www.uscg.mil/history/webcutters/Courier_WAGR410_Photos.asp. Accessed: 2010-06-04. (Archived by WebCite® at http://www.webcitation.org/5qEcH1yCd)
4. ^ "Voice of America Broadcasts From Coast Guard Cutter". Modesto Radio Museum. http://www.modestoradiomuseum.org/voa%20courier.html. Retrieved 16 November 2010.