US Navy RTTY Demodulators / FSK Converters

RTTY is also called RATT (Radio Teletype)

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Back to main Navy RTTY page
Please send me e-mail if you have more info or links for me to add
thanks, Nick KD4CPL

This page is for RTTY electronics
Go to Navy Teletype Page for actual TTY equipment

Early USN RTTY equipment - Click Here
FRA, FRC, FRE, FRF, FRH receiving converters

1950's-60's DEMODULATORS - FSK RECEIVING CONVERTERS
MODEL	PHOTO	PURPOSE	SPECS	NOTES
AN/FRA-4 Comprises CM-26/FRA-24 comparator, KY-60/FRA-4 keyer, PP-561/FRA-4 power supply		50 kc IF input triple diversity demod - for use with RBP or RCP rcvrs	spec sheet	Manual NAVSHIPS 91496

CV-57/URR AN/URA-6 diversity system comprises two CV-57/URR plus one CM-14/URR Comparator		455kc IF input demod with tuning scope	395-470kc IF input (photos thanks to Ken Schwieker) Spec Sheet	manual NavShips 91355 manuf RCA
CV-71/URR AN/URA-7 diversity system comprises two CV-71/URR plus one CM-14/URR Comparator	also see CV-57 photo above	50kc IF input demod with tuning scope	47.5-52.5 kc IF input - otherwise appears identical to CV-57 Spec Sheet	manual NavShips 91355 manuf RCA Please send me email if you have a CV-71 for sale or trade
CV-60/URR AN/URA-8 diversity system comprises two CV-60/URR plus one CM-14/URR Comparator		audio input demod with tuning scope	audio input unit - electrically same as CV-89A but externally same as CV-57 Spec Sheet	Note: URA-8 is interchangeable with but not the same as URA-8A manuf RCA Manual NAVSHIPS 91339

CV-89/URA-8A CV-89A/URA-8A AN/URA-8A diversity system comprises two CV-89 plus one CM-22/URR Comparator AN/URA-8B diversity system comprises two CV-89A plus one CM-22A/URR Comparator Note: units and internal modules are interchangeable except URA-8B units have blowers on rear, URA-8A units do not.	CV-89A photo courtesy of Western Historic Radio Museum	audio input demod with tuning scope	See CQ Magazine June 1962, page 81, for hookup and operation info (see http://hamcall.net/cq) See 73 Magazine, June 1985, page 46 for hookup to RS-232	More CV-89 info here Manual NAVSHIPS 91278 (URA-8A) or 91490 (URA-8B) USAF manual is T.O. 21R1-2URA8-11 manuf - Hoffman & National (URA-8B)
	(schematic from manual T.O. 16-30URA8-6, thanks to a greenkeys list member) audio input - pin A, pin B (AN3106-14S-7)) TTY - negative ground pin B, positive pin A (switched to ground) (AN3106-14S-9S) power - 115vac pin C, pin A (AN3106-14S-7S)

CV-127/FRR-24 part of AN/FRR-24 receiver system		50kc IF input demod - part of FRR-24 receiver - no internal power supply		Manuf - National Radio Please send me email if you have a CV-127 or any other FRR-24 parts for sale or trade

CV-227/URA-12 AN/URA-12 diversity system comprises two CV-227/URR and one CM-42/URR comparator		200kc IF input demod 190-210 kc input	appears similar to CV-57	spec sheet


CV-483/URA-17 AN/URA-17 diversity system comprises two CV-483		audio input demod with tuning scope	Essentially a solid-state version of the CV-89A/URA-8A. 10 to 1000cps shift	Manual is NAVSHIPS 94028 or NAVSHIPS 0967-034-9010 or NAVSHIPS 0967-LP-034-9010 See CQ magazine July 1973, page 73, for info (avail at http://hamcall.net/cq) More info here USN operational info here Another photo here
	CV-483/URA-17 Schematic (thanks to Randy Guttery) click image above for 3300x750 or click here for 6500x1500 J6 TTY output - negative ground pin B, positive pin A (switched to ground) (AN3106-14S-9S) Full Manual (thanks to Rice) 26 MB PDF file so may take a while to download

CV-763/URR (TMC model CFA-1)		audio input dual diversity demod	Spec sheets Manual manuf - TMC	See CQ magazine July 1971, page 84, for info (avail at http://hamcall.net/cq) Please send me email if you have a CV-763 for sale or trade
CV-763/URR (TMC model CFA-1)		Connections - audio input #1 - terminals 1,2 audio input #2 - terminals 3,4 ground - terminal 5 loop supply pos - terminal 6 loop supply neg - terminal 7 TTY neg - terminal 8 (jumpered internally to terminal 7) TTY pos - terminal 9 (switched to terminal 6)