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| According to the Sparker who drew this sketch, the TW-12 was fitted in RCN Corvettes. |
Design Date: 1935
Frequency Range: 375 to 500 KHz; 1200 to 3000 KHz;
Modes: CW/MCW/RT
Power Output: Unknown
Frequency Control: Free running Master Oscillator
Mains power: M-G set.Comments Type TW-12 and its mating receiver the 394E are commercial sets which have been adopted for Naval use in small craft. The Type TW-12A consists of the TW-12 transmitter, the 394E receiver and necessary power supplies. The Type TW-12B consists of the TW-12 transmitter, the 394E receiver and a additional receiver, the CSB. The CSB receiver covers 15 KHz to 20 MHz , using three VR27 valves and was considered to be a "separate line of communication".
The TW-12AE installation was comprised of a TGY-1 transmitter and a type 394G receiver. Not sure why this radio outfit was given the TW12 prefix when there is nothing about it that is TW12 !
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| According to the Sparker who drew this sketch, the TW-12 was fitted in RCN Corvettes. |
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| 1. Master Oscillator and spot frequency stops. | 9. Filament rheostat |
| 2. M/F I/F switch | 10. Filament voltmeter |
| 3. CW /ICW switch | 11. Ammeter for tuning power amplifier |
| 4. I/F aerial taps | 12. Aerial ammeter |
| 5. I/F anode taps | 13. +13A H/F attachments |
| 6. I/F tuning condenser | 14. H/F tuning condenser |
| 7. M/F variometer | 15. H/F tuning inductance |
| 8. Key Jack | 16. Aerial coil taps. |
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| TW-12 transmitter (Courtesy British Admiralty) |
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| Rear view of the TW12 transmitter , (Courtesy Commsmuseum.co.uk) |
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| The mating receiver (if used) with the TW12 was the 394E made by Marconi International UK. (Courtesy Commsmuseum.co.uk) . |
| Title page for the TW-12A/B/C/D/E manual |
Credits:1) TW-12 image http://www.rnmuseumradarandcommunications2006.org.uk/MARCONI_TW12_P.html
2) Tom Brent <navyradiocom(at)gmail.com>
3) 394E photo: http://www.commsmuseum.co.uk/transmitters/132%20Type%20Marconi%20TW12/pdfs/marconitw12photos.pdf
Oct 17/22