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

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RTTY Receiving Equipment

FRA  (400 kc IF input demod)  - for use with RBB and RBC rcvrs  FRA (CRV-35122) manual is NAVSHIPS 900,613  info in NAVPERS 10190-A (ET2 training manual vol. 1)		CRV-10563 couples FRA    demod to RBB or RBC rcvr IF
FRC  (AF input dual diversity demod)  - for use with RBP rcvr FRC-1 includes CHG-50212A mixer, CHG-20345A keyer, CHG-53215A filter Manual is NAVSHIPS 900,718
FRE  (455 kc IF input triple diversity demod)   - for use with RDM rcvr FRE (CRV-35104) manual is NAVSHIPS 95100
FRF  (400kc-470kc IF input dual channel demod)  - for use with RBB, RBC, or RDM rcvrs FRF consists of CW-35118 converter, CW-35117 osc, CW-20457 p/s Manual is NAVSHIPS 900,208
FRH  50kc IF input dual channel demod   - for use with RBP or RCP rcvrs FRH consist of CW-35119 converter, CW-35117 osc, CW-20457 p/s Manual is NAVSHIPS 900,358

RTTY Transmitting Equipment

FSA frequency shift keyer  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
FSB frequency shift keyer  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)
FSD frequency shift keyer  crystal controlled exciter provides  2 to 5 mc, 1.5w output to xmtr  includes CYV-35065 keyer and CYV-20349 p/s  FSD manual is NAVSHIPS ???

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