MARCONI WIRELESS of AMERICA - EQUIPMENT LISTING

The radio equipment made by the Marconi Wireless Telegraph Company of America  listed below, has been catalogued from two main sources. The first primary source are the engineering drawings "Finding Aid"  prepared by Anastasia Day of the Hagley Museum and Library, Manuscripts and Archives Department. A copy of this PDF document can be found here. The drawings are organized by filing numbers from early RCA historian George H. Clark. Clark’s catalog numbering system was an extension/adaptation from a US Navy classification system.  Equipment extracted from this document bears a specific date. It is presumed, that the drawing date and the in-service date for the equipment are relatively close to each other.

The second primary source is a spreadsheet of equipment provided by the Infoage library web site .  An Excel copy of the spreadsheet can be found here.  A great deal of care was exercised when radio information was being extracted from the document.  Many of the ubassemblies were identified with the same model number as a complete receiver or transmitter.

The equipment list is by no means complete. If you can help to enhance this listing, please contact: Jerry.proc@sympatico.ca
 
 

MODEL # FUNCTION POWER/NOTE WAVELENGTH CIRCA COMMENT 
? Transmitter 0.5 KW  ? 1916 December 8. Quenched gap transmitter
? Transmitter 1.5 KW  ? 1917 January 14.  Panel transmitter
? Transmitter 2 KW, 500 cycle ? 1915 September 3  
? Transmitter 10 KW, 500 cycle ? 1915 February 16. . US Signal Corps proposal 
Transmitter 20 KW ? 1918 September 26. . Used at Fort Sam Houston
? Transmitter  25 KW ? ? Disc discharger
BC14A Receiver  n/a ? ? Signal Corps. a.k.a. SCR-54A
C296-B Transmitter 0.5 KW ? ?
C3 Transmitter (?) ? ? ? Army Cart set
CM Switchboard ? Radio switchboard
CM 98     ? ? Motor boat set
CM 294 /B/C Receiver n/a 250  to  3100 m  ?
CM 296B Transmitter 0.5 KW  ? ? Paired with type 106 receiver
CM 297 Transmitter  5 KW  ? 1918 March 28  
CM298 Transmitter 5 KW ? Navy set 120 and 230 VDC
CM299 Transmitter 5 KW ? Navy set 120 and 230 VDC
CM 300 Transmitter 5 kw ? ?
CM 301 Transmitter 5 KW ? 1918  March 12.  
CM
305
Transmitter  2 KW ? 1918 December 24 US Navy auxiliary transmitter.
CM 306 Transmitter 2KW ? ?
CM 307 Aux xmitter 2 KW ? 1918 October 24  
CM 309  Transmitter 1 KW  ? 1918 February 27. . For US Navy
CM 314 Transmitter ? ? ?
CM 416 Switchboard n/a ? ?
CM 858 Transmitter 5 KW ? 1918 May 23
CM 1122 Transmitter 2 KW  ? 1918 September 25
CM1123 Transmitter  5 KW ? ?
M1 ? ? ? ? Mule pack set
P1 Transmitter  5 KW ? 1916 December 21.
P3 Transmitter  2 KW, 500 cycle ? 1915 January 2 Supplied on  US Navy contract no. 21,507.
P4 Transmitter  2 KW, 500 cycle ?
P4A Transmitter  2 KW, 500 cycle ? ?
P4B Transmitter 1 KW 500 cycle  ? ?
P5 Transmitter  5 KW, 500 cycle ? 1915 August 14.
P6 Transmitter  5 KW, 500 cycle ? 1916 February 25.
P8 Transmitter  2 KW ? 1919 December 17 Mated with  receiver type 106 B
P11 Transmitter 0.5 KW ? ?
P13  Transmitter 0.5 KW, 500 cycle ? 1917 March 19.
P18 Transmitter  1 KW, 500 cycle See Comment 1918 October 2 300, 600 and 952 meters

 
MODEL # FUNCTION POWER/NOTE WAVELENGTH CIRCA COMMENT 
SCR-54A Receiver n/a 200 to 600 m a.k.a. BC-14A
SCR 105 Trench Rx and Tx  ? ? 1918 September 20 Quenched gap transmitter
SE 68 Key ? n/a ? Auxiliary key 
SE 80 Switchboard  n/a ? ? Radio switchboard.
SE 81A Switchboard  n/a n/a ? Radio switchboard
SE 81B Transmitter 2 KW ? 1918 June 12. .
SE 84 Tone Tester n/a n/a ?
SE 86 Key ? n/a ? Flameproof key for submarine radio 
SE 87  Transmitter 5 KW ? ?
SE 89 Transmitter 2 KW  ? ?
SE 90 Transmitter 2 KW ? ?
SE 95 Receiver n/a Long wave ?
SE 108 Transmitter ? ? 1918 January 25.
SE 109 Transmitter ? ? 1918 January 25. Quenched gap transmitter
SE 327 Transmitter 10 KW ? ?
SE 328 Transmitter 10 KW ? ?
SE 653 Transmitter 0.5 KW ? ? Flameproof key for use in submarines
SE 970  Transmitter 2 KW ? ?
SE 1000A Amplifier n/a n/a ? Two stage AF amplifier
SE  1100  Transmitter ? ? 1918 May 2 Flying boat transmitter. 
SE 1205A Transmitter 2 KW 1918 September 8.
SE1060  Transmitter ? ? 1917
SE 1405A Amplifier n/a n/a ? Six stage AF amplifier
SE 1420-A and B  Receiver n/a ? ? Medium wave receiver
SE 1443-A Key ? n/a ? Flameproof key
SE 3519 Test buzzer n/a n/a ?
Standard 1 KW Transmitter 1 KW ? ?
Standard 2 KW Transmitter 2 KW ? ?
S1  Switchboard n/a -- -? Switchboard for P6
Station Wavemeter Wavemeter n/a ? ?
Ten Inch Coil  Aux Set Transmitter ?    
Type A  Xmitting key  Up to 4 kw  n/a ?
Type D Tuner -- ? ?  
Type E  Tuner -- ? ?
         
21  Wavemeter  n/a  ?  ?  
24 Decremeter n/a ? ? An instrument for measuring the logarithmic decrement of electromagnetic waves.
25 Wavemeter 2 KW ? "
26 Decremeter n/a ? ?
27  Wavemeter n/a ? ?
28  Wavemeter n/a ? ?
101 Receiver n/a ? ?
102 Tuner n/a ? ?
105 Receiver n/a ? ?
106 Receiver n/a 200-3500 m ?
106B Receiver n/a ? ?
107A  Receiver n/a ? ?
110  Receiver n/a ? ?
111 Receiver n/a ? ?
112  Receiver n/a ? ? Cargo set
113 Receiver n/a ? 1917 April 11.  
117  Receiver n/a ? ?
118  Receiver n/a ? ?
119 Receiver m/a ? ?
120 Receiver n/a ? ? Signal Corps receiver
121 Receiver n/a ? ? Signal Corps receiver
122 Receiver n/a ? ? Signal Corps receiver
294 (See CM294) Receiver -- 250  to  3100 m ?
380  Transmitter  2 KW ? 1919 October 11.
442 Transmitter  2 KW ? ? Belt  driven transmitter
444 Transmitter  0.5 KW ? ?
463 Control box n/a n/a ? Audio control box 
531 Transmitter  0.5 KW 500 cycle 300 to 1,000 m 1920 August 12. .

Contributors:

1) Steve Rosenfeld <oceangate(at)comcast.net>
2) Finding Aid  http://hdl.library.upenn.edu/1017/d/pacscl/HML_246483
3) Infoage Science and History Centre  https://infoage.org/

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