US Navy RTTY Demodulators / FSK Converters

RTTY is also called RATT (Radio Teletype)

Main Vintage Navy Radio Page
Back to main Navy RTTY page
- Navy RTTY Transmitting Keyer page
- Navy RTTY Terminal Unit (converter + keyer) page
Please send me e-mail if you have more info or links for me to add
thanks, Nick K4NYW
Go here for FSK and AFSK EQUIPMENT MANUALS

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) - See HERE for FSK equipment manuals
AN/FGC-1	Dual Diversity system for use with RBP receivers		general description from AN/FGC-1 manual (TM 11-356) general description from AN/FGC-1A manual (Western Electric)
AN/FRA-4	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		Manual NAVSHIPS 91496 another spec sheet
AN/FRA-86 (AFSAV-133D)	Twin-channel FSK & DFSK unit used by SECGRU - also by COMMSTAs? Info - Description & Operation Manual	more to post later	--
AN/URA-6 AN/URA-6 diversity system comprises two CV-57/URR plus one CM-14/URR Comparator	CV-57 - 455kc IF input converter with tuning scope 395-470kc IF input (photos thanks to Ken Schwieker)	CM-14 comparator CM-14 controls	manual NavShips 91355 Spec Sheet manuf RCA CV-57 mod to airborne TU
Photos thanks to W5JV
AN/URA-7 AN/URA-7 diversity system comprises two CV-71/URR plus one CM-14/URR Comparator	CV-71 50kc IF input converter with tuning scope CM-14 -	47.5-52.5 kc IF input - otherwise appears identical to CV-57	manual NavShips 91355 Spec Sheet manuf RCA
AN/URA-8 AN/URA-8 diversity system comprises two CV-60/URR plus one CM-14/URR Comparator	CV-60 audio input converter with tuning scope CM-14 -	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

AN/URA-8A AN/URA-8B	AN/URA-8A diversity system comprises two CV-89/URA-8A plus one CM-22/URR Comparator in MT-719/URA-8A enclosure	AN/URA-8B diversity system comprises two CV-89A/URA-8A plus one CM-22A/URR Comparator in MT-719/URA-8A enclosure	Note: units and internal modules are interchangeable except URA-8B units have blowers on rear, URA-8A units do not.
	audio input converter with tuning scope CV-89A photo courtesy of Western Historic Radio Museum		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		AN/URA-8B
CV-89/URA-8A	CV-89 rear - no fan connector CV-89 rear - no fan	CV-89A/URA-8A	CV-89A rear - fan connector CV-89A fan
CM-22A/URA-8A	CM-22A/URA-8A		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
CM-22A/URA-8A	CM-22A/URA-8A	CM-22A/URA-8A
AN/URA-8B manual - download pdf	(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)
AN/URA-12 AN/URA-12 diversity system comprises two CV-227/URR and one CM-42/URR comparator		CV-227 - 200kc IF input converter 190-210 kc input CV-227 controls	spec sheet prototype serial #1
AN/URA-17 AN/URA-17 diversity system comprises two CV-483/URA-17 audio input converter with tuning scope Essentially a solid-state version of the CV-89A/URA-8A. 10 to 1000cps shift	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) More info here USN operational info here Another photo here URA-17 Manual (thanks to Rice) URA-17C Manual URA-17D Manual (thanks to Hutch)
			AN/URA-17(XN-1) Prototype Concept
NOTE: AN/URA-17, AN/URA-17A, AN/URA-17B, AN/URA-17C, and AN/URA-17D are receive-only AFSK converters (see above) NOTE: AN//URA-17E, AN/URA-17F, and AN/URA-17G are receive + transmit AFSK Terminal Units - see TU page
CV-116/URR	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	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-763/URR (TMC model CFA-1)	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)	Spec sheets Manual manuf - TMC	See CQ magazine July 1971, page 84, for info (avail at http://hamcall.net/cq)
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.		Colored cylinders are plug-in filters	Please send me e-mail if you have any info about this unit.
Hoffman Model 170 - prototype Please send me e-mail if you have any info about this unit.	Dual Diversity RTTY converter		--
Boehme 5-C Series B			NAVSHIPS 92660
OTHER RELATED EQUIPMENT
R-466/UC Keying converter Converts on-off tone signals (not FSK) to loop current keying Spec Sheet
			NAVSHIPS 91612 - pdf
R-551/UC Keying converter	Converts on-off tone signals (not FSK) to loop current keying	Similar use as R-446/UC but also includes TTY sync pulse circuit	NAVSHIPS 91907 - pdf
OSA Monitoring Scope (Tuning Indicator)			designed to mount up high with a tilt-down swivel.
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IP-352/UR Monitoring Scope (Tuning Indicator)			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
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