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SCR-578 BC-778

SCR-578 BC-778; MILITARY U.S. (ID = 1886314) Military
SCR-578 BC-778; MILITARY U.S. (ID = 252125) Military SCR-578 BC-778; MILITARY U.S. (ID = 252142) Military
SCR-578 BC-778; MILITARY U.S. (ID = 252143) Military SCR-578 BC-778; MILITARY U.S. (ID = 252144) Military
SCR-578 BC-778; MILITARY U.S. (ID = 252145) Military
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SCR-578 BC-778; MILITARY U.S. (ID = 252125) Military
MILITARY U.S.: SCR-578 BC-778 [Military] ID = 252125 614x425
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For model SCR-578 BC-778, MILITARY U.S. (different makers for same model)
Country:  United States of America (USA)
Manufacturer / Brand:  MILITARY U.S. (different makers for same model)
Year: 1942 Category: Military Equipment (not Re, Tr or RXT)
Valves / Tubes 2: 12A6 12SC7
Wave bands Wave Bands given in the notes.
Power type and voltage Solar- and/or muscle driven, also addl. power jack possible
Loudspeaker - For headphones or amp.
Power out
from Model: SCR-578 BC-778 - MILITARY U.S. different makers
Material Metal case
Shape Tablemodel, with any shape - general.
Dimensions (WHD) 265 x 265 x 215 mm / 10.4 x 10.4 x 8.5 inch
Notes Radio transmitter of life-raft emergency set SCR-578 known as "Gibson Girl" for its ergonomic shape. Used by US Army Air Force. The transmitter was not crystal controlled. It consisted of an ECO RF oscillator-RF output valve 12A6, operating on 500 kHz, grid modulated by a 1000 Hz tone oscillator valve 12SC7. Equivalent to US Navy Model TCY. The SCR-578 is powered by a hand-cranked DC generator that is inside the case (note the crank on top of one of the photos).
Source of data - - Data from my own collection

Model page created by Ernst Rykkje. See "Data change" for further contributors.

All listed radios etc. from MILITARY U.S. (different makers for same model)
Here you find 343 models, 296 with images and 167 with schematics for wireless sets etc. In French: TSF for Télégraphie sans fil.


Forum contributions about this model
Threads: 2 | Posts: 3
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military: BC-778; SCR-578
Uwe Rehage † 2015

Dieses Funkgerät wurde als eines von dreien, von Thor Heyerdahl auf seiner Kon-Tiki Expedition im Jahre 1947 benutzt. Im Kon-Tiki-Museum in Oslo kann man ein Exemplar besichtigen. Es handelt sich allerdings nicht um das Gerät welches auf der Expedition betrieben wurde.

Die von den Expeditionsfunkern benutzte Morsetaste und das Logbuch sind im Original ausgestellt.

                               Das im Kon-Tiki-Museum in Oslo ausgestellte Gerät



Martin Bösch

Beim SCR-579 handelt es sich um einen seit dem 2. Weltkrieg weit verbreiteten Seenotsender mit Kurbelbetrieb, der auf eine Festfrequenz (int. Seenotfrequenz von 500 kHz) abgestimmt ist, er dürfte (meine Spekulation) als Seenotsender mitgeführt worden sein, aufgrund der Fixfrequenz nicht zu Kommunikationszwecken.

Lieber Gruss Martin Boesch

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military: Life-raft emergency set 'Gibson Girl' BC-778; SCR-578
Ernst Erb

The life-raft emergency set SCR-578 contains a radio transmitter BC-778, called "Gibson Girl" for its shape. It was used in the WW2 by US-Amercan forces in case of an emergency. A guest, Jim Mandaville, has explained the following:

The "round thing" is a door which opens to expose a cylindrical chamber.  Mounted on the back of the door is a reel with the antenna on it.  The antenna is about 92 m long (only about one sixth wavelength at the operating wavelength of 600 m.)  Some models also had a second frequency in the short wave range, either 8280 or 8364 kHz.  This used the same antenna, which was then more efficient.

The antenna lead-in wire (about 1.5 m long) comes out from the back of the chamber.  It has a spring clip on the end so you can attach it to the antenna.  The antenna itself is raised at its far end by a kite or a hydrogen balloon (both of which are supplied in the original radio package).

The radio is operated in a sitting position, with the radio held vertically between one's upper legs, with the crank at the top.  The straps go around the thighs to hold it firmly in place while the operator cranks.  That is why the case has that "Gibson Girl" shape -- so it can be held more easily. It is quite a bit of work to operate the crank and maintain the minimum voltage (which is indicated by a light on the top of the case)!

It is rather amazing how the insides of the radio are kept waterproof through the use of gaskets at all case openings.  When new, it could be thrown into the sea and would float and not leak, and still operate when taken out of the water.

This transmitter was a close copy of the German NS2 (Notsender Gerät 2). The British captured  one of these from a crashed German plane and made a copy themselves. Another captured unit was sent to the U.S., where it was promptly copied in a somewhat different version.  The whole idea was German and copied by G.B. and the U.S.

Thank you, Jim.

End of forum contributions about this model