Early US Navy RATT Equipment
1940's & early 1950's

"Military Teletypewriter Systems of World War II" - pdf link

RATT Receiving Equipment

FRA  - 400 kc IF input frequency shift converter - for use with RBB and RBC rcvrs

FRA Spec sheets

 FRA (CRV-35122) manual is NAVSHIPS 900,613
 info in NAVPERS 10190-A (ET2 training manual vol. 1)

General description from manual

 

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 CRV-10563 couples FRA  
 demod to RBB or RBC rcvr IF
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FRB - AFSK Facsimile Converter - Spec Sheets

FRC  - audio input dual diversity frequency shift converter - for use with RBP rcvr

FRC spec sheets

FRC-1 includes CHG-50212A mixer, CHG-20345A keyer, CHG-53215A filter
Manual is NAVSHIPS 900,718

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FRE  - 455 kc IF input triple diversity frequency shift converter  - for use with RDM rcvr

FRE spec sheets

FRE (CRV-35104) manual is NAVSHIPS 95100

General description from manual

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FRF  - 400kc-470kc IF input dual channel frequency shift converter - for use with RBB, RBC, or RDM rcvrs

FRF spec sheets

FRF consists of CW-35118 converter, CW-35117 osc, CW-20457 p/s
Manual is NAVSHIPS 900,208

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FRG - audio input frequency shift converter - for use with RBB, RBC receivers

Manufactured by Press Wireless

Spec Sheets

General description from manual

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FRH  50kc IF input dual channel frequency shift converter  - for use with RBP or RCP rcvrs

Sames as FRF with different IF input

FRH spec sheets

FRH consist of CW-35119 converter, CW-35117 osc, CW-20457 p/s
Manual is NAVSHIPS 900,358

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FSC - audio input dual frequency shift converter
 - for use with RBP

Built by Washington Navy Yard
includes RW-20340 power/keyer, RW-50212 mixer, & RW-53215 filter
Manual is NAVSHIPS 900,078

general description from manual

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RTTY Transmitting Equipment

FSA - frequency shift keyer

FSA spec sheets

 mixes 200 kc FSK signal with xmtr oscillator input 
 1.0 to 6.7 mc, 2w output to xmtr
 FSA (CW-35060) manual is NAVSHIPS 900,754

general description from manual

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FSB - frequency shift keyer

FSB spec sheets

 mixes 200 kc FSK signal with xmtr oscillator input 
 1.0 to 6.7 mc, 2w output to xmtr 
 FSB (CYV-35062) manual is NAVSHIPS 900,928
 info in NAVPERS 10190-A (ET2 training manual vol. 1)
(excerpt thanks to Google Books)

 

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FSD FSK facsimile transmitting keyer - Spec Sheets
MX-1262/URT
(CBOT-23510) 		FSK Coupling Adapter for TBL transmitter connects TBL to FSA, FSB, KY-30/GRT, KY-58/GRT, KY-75/SRT or similar keyer

section 1 couples xmtr master oscillator to FSK keyer.

section 2 couples FSK keyer output to xmtr's first IPA tubes 

NAVSHIPS 91885

manuf by American Electronic Laboratories Inc.

CYV-23510 FSK Coupling Adapter for TBK & TBM transmitters This is a small unit installed into a TBK (or TBM) transmitter to allow easy hookup of an external frequency shift keyer. Has two tuned RF transformers, one to couple the TBK osc to the 75 ohm FSK input, and the other to couple the 75 ohm FSK output to the TBK IPA. Controls are a common tuning knob for both transformers plus a switch to bypass the FSK. NAVSHIPS 900,206

manuf by Press Wireless