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


FSK RECEIVING CONVERTERS (DEMODULATORS)

AN/FGC-1
fgc1-01.JPG (3400243 bytes)

Dual Diversity system for use with RBP receivers
fgc1-02.JPG (2227827 bytes)
general description from AN/FGC-1 manual (TM 11-356)

general description from AN/FGC-1A manual (Western Electric)

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

AN/FRA-86 (AFSAV-133D)
fra86-01.jpg (68142 bytes)

Twin-channel FSK & DFSK unit used by SECGRU - also by COMMSTAs?

Info - Description & Operation

more to post later

fra86-02.JPG (106587 bytes)

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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 - 
cm14-urr-01.JPG (119408 bytes)

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

cv60-180.JPG (4383015 bytes)

CM-14 - 
cm14-urr-01.JPG (119408 bytes)

  • audio input unit - electrically same as CV-89A but externally same as CV-57

cv60-176.JPG (4041489 bytes)

  • Note: URA-8 is interchangeable with but not the same as URA-8A
  • manuf RCA
  • Spec Sheet
  • Manual NAVSHIPS 91339

cv60-183.JPG (4296727 bytes)

cv60-177.JPG (4123015 bytes) cv60-182.JPG (3973514 bytes) cv60-178.JPG (3852208 bytes) cv60-179.JPG (4117383 bytes)

CV-89/URA-8A
CV-89A/URA-8A

AN/URA-8A
diversity system comprises two CV-89 plus one CM-22/URR Comparator in MT-719/URA-8A enclosure
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

ura8b-dia-1103-01.JPG (486227 bytes)
  • 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)
AN/URA-8A
ura8a_5350.JPG (2689736 bytes)
ura8a_5349.JPG (2822207 bytes) AN/URA-8B
ura8b-1307-01.jpg (545671 bytes)
ura8b-1307-02.jpg (356366 bytes)

CV-89 (not CV-89A)
P1010203.JPG (26114 bytes)

CV-89 rear - no fan
P1010204.JPG (1085469 bytes)
CV-89 rear - no fan connector
P1010205.JPG (1071299 bytes)
CV-89A rear - fan connector
P1010206.JPG (1098019 bytes)

cm22a-ura8-1300.jpg (27913 bytes)
CM-22A/URA-8A

cm22a-ura8-1302.jpg (19009 bytes)
CM-22A/URA-8A
cm22a-ura8-1305.jpg (95829 bytes)
  • 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
 

cm22a-ura8-1306.jpg (86625 bytes)
CM-22A/URA-8A

cm22a-ura8-1312.jpg (127852 bytes)
CM-22A/URA-8A
cm22a-ura8-1311.jpg (53384 bytes)
CM-22A/URA-8A
ura8-scope-01.JPG (134319 bytes)

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cv89-schem-01.JPG (206533 bytes)cv89-schem-02.JPG (292115 bytes)cv89-schem-03.JPG (274925 bytes)cv89-schem-04.JPG (295912 bytes)
(CV-89 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

P1010019.JPG (81326 bytes)

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)

ura17-1103-01.JPG (268021 bytes)

audio input converter with tuning scope

Essentially a solid-state version of the CV-89A/URA-8A. 10 to 1000cps shift

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)

See CQ magazine July 1973, page 73, for info (avail at http://hamcall.net/cq)

Manual is NAVSHIPS 94028 or 
NAVSHIPS 0967-034-9010 or 
NAVSHIPS 0967-LP-034-9010 or NAVSHIPS 0967-LP-340-0010 
  • More info here 
  • USN operational info here
  • Another photo here 

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

cv483c-ura17-1207-01.jpg (35019 bytes) cv483c-ura17-1207-02.jpg (146576 bytes) cv483c-ura17-1207-03.jpg (59920 bytes)

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)

 

CV-2310()/G FSK and DFSK demodulator  - Perhaps the replacement for AN/FRA-86 (see above). Please send me e-mail if you have any info about this unit.

cv2310-01.jpg (552359 bytes)

cv2310-02.jpg (1374279 bytes) Colored cylinders are plug-in filters

cv2310-03.JPG (841349 bytes)

Please send me e-mail if you have any info about this unit.

cv2310-04.JPG (673449 bytes)

OTHER RELATED EQUIPMENT

R-466/UC
Keying converter

Converts on-off tone signals (not FSK) to loop current keying

r466-uc-51.jpg (138281 bytes)

r466-uc-54.jpg (99928 bytes)

r466-uc-55.jpg (69020 bytes)
r466-uc-52.jpg (121047 bytes) r466-uc-53.jpg (113199 bytes) r466-uc-56.jpg (163280 bytes) -

OSA Monitoring Scope
(Tuning Indicator)

osa-04.jpg (112925 bytes)

osa-01.jpg (82981 bytes) osa-02.jpg (72213 bytes) osa-03.jpg (132740 bytes)

designed to mount up high with a tilt-down swivel.

osa-nib-1303-01.JPG (68412 bytes) osa-nib-1303-02.JPG (55910 bytes) osa-nib-1303-03.JPG (47779 bytes) osa-nib-1303-04.JPG (60144 bytes)

IP-352/UR Monitoring Scope
(Tuning Indicator)
ratt-display-04.JPG (18928 bytes)

ratt-display-05.JPG (14183 bytes) ip352-01.JPG (194832 bytes)

Manuf by Hoffman and designed to mount up high with a tilt-down swivel.

Please send me e-mail if you have a NAVSHIPS 92705 manual

ratt-display-01.JPG (90796 bytes) ratt-display-02.JPG (107063 bytes) ratt-display-03.JPG (130799 bytes) --

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.