US Navy RTTY Demodulators / FSK Converters

RTTY is also called RATT (Radio Teletype)

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  fra4-1a.JPG (66621 bytes)
 KY-60/FRA-4 keyer
CM-26/FRA-24 comparator
PP-561/FRA-4 power supply		 50 kc IF input triple diversity converter - for use with RBP or RCP rcvrs

fra4-10.JPG (264681 bytes)

 fra4-11.JPG (110549 bytes) Manual NAVSHIPS 91496

another  spec sheet
CV-57/URR 

AN/URA-6 diversity system comprises two CV-57/URR plus one CM-14/URR Comparator

 cv57-13.jpg (108205 bytes)

cv57-01.jpg (87609 bytes)

cv57-02.jpg (232925 bytes)
CV-57 - 455kc IF input converter with tuning scope

395-470kc IF input (photos thanks to Ken Schwieker)

cm14-urr-01.JPG (119408 bytes)
CM-14 comparator
cm14-urr-03.JPG (196928 bytes)
CM-14 controls

CV-71/URR 

AN/URA-7 diversity system comprises two CV-71/URR plus one CM-14/URR Comparator

 ura6-01.jpg (96307 bytes) cv71-urr-01.jpg (9378 bytes)
cv71-urr-02.jpg (8343 bytes)
CV-71 50kc IF input converter with tuning scope

CM-14 - see photo above

 47.5-52.5 kc IF input - otherwise appears identical to CV-57

cv71-urr-03.jpg (8933 bytes)

CV-60/URR 

AN/URA-8 diversity system comprises two CV-60/URR plus one CM-14/URR Comparator

 ura8-01.jpg (85924 bytes) CV-60 audio input converter with tuning scope

CM-14 - see photo above
  • audio input unit - electrically same as CV-89A but externally same as CV-57
  • Note: URA-8 is interchangeable with but not the same as URA-8A
  • manuf RCA
  • Spec Sheet
  • 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.

 ura8a-01.jpg (57288 bytes) audio input converter with tuning scope

cv89a-01.jpg (127657 bytes)
CV-89A photo courtesy of Western Historic Radio Museum

  • 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)
cv89-schem-01.JPG (206533 bytes)cv89-schem-02.JPG (292115 bytes)cv89-schem-03.JPG (274925 bytes)cv89-schem-04.JPG (295912 bytes)
(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-116/URR need photo dual diversity 455kc IF input converter  Signal Corps procurement but used by USN as part of AN/FRR-38 dual diversity receiving system -
CV-127/FRR-24

part of AN/FRR-24 receiver system

 cv127-01.jpg (131455 bytes) 50kc IF input converter - part of FRR-24 receiver - internal HV power supply only Please send me email if you have a CV-127 or any other FRR-24 parts for sale or trade-
  • Manuf - National Radio
CV-227/URA-12

AN/URA-12
diversity system comprises two CV-227/URR and one CM-42/URR comparator

 ura12-01.jpg (63438 bytes)

cv227-urrr-02.JPG (125102 bytes)
CV-227 - 200kc IF input converter 
190-210 kc input

cv227-urrr-03.JPG (182118 bytes)
CV-227 controls

 cv227-urrr-01.JPG (92043 bytes)
prototype serial #1		 spec sheet
CV-483/URA-17

AN/URA-17 diversity system comprises two CV-483

 cv483-01.jpg (15139 bytes)  audio input converter with tuning scope

ura17-schem-01b.jpg (440863 bytes)
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)
 Essentially a solid-state version of the CV-89A/URA-8A. 10 to 1000cps shift

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 

 Manual is NAVSHIPS 94028 or 
NAVSHIPS 0967-034-9010 or 
NAVSHIPS 0967-LP-034-9010 or NAVSHIPS 0967-LP-340-0010 

Full Manual (thanks to Rice)
26 MB PDF file so may take a while to download

CV-763/URR
(TMC model CFA-1)		 cv763-01.jpg (46163 bytes) audio input dual diversity converter 

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)

 

Also see Navy RTTY Terminal Unit (converter + keyer) page

List of 61 military surplus RTTY units

Includes brief descriptions - See CQ magazine September 1972, page 83 (avail at http://hamcall.net/cq)

Northern Radio RTTY demods, FSK converters, etc.

Greenkeys

This is a great email list for TTY and RTTY information
http://mailman.qth.net/mailman/listinfo/greenkeys
Check out the greenkeys archives

Navy RTTY Links - more interesting info and photos

More RTTY links

Communication equipment manuals and descriptions

TTY manuals