T-827/URT Equipment Model Differences

• Predecessor - General Dynamics SC series equipment
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Designed by Stromberg-Carlson (General Dynamics) & manufactured by several others
Predecessor - General Dynamics SC series equipment
Used in AN/WRC-1 transceiver - 1962 development report  
100 cps incremental tuning 1963 proposal
12 kc bandwidth 1964 proposal

AN/WRC-1 Logistics manual - lots if info about interchangeability, etc.

AN/URT-23(V) NAVELEX 0967-LP-879-5010
TABLE 1-4. EQUIPMENT SIMILARITIES

ITEM	T-827/URT	T-827B/URT	T-827D/URT	T-827E/URT
Used in -	AN/WRC-1 AN/URT-23 (early)	AN/WRC-1B AN/URT-23	AN/URT-23 AN/URT-24	AN/URT-23
Tuning increments	500Hz	100Hz	100Hz	100Hz
KCS controls	Incorporate stops	Incorporate stops	Stops not incorporated	Incorporate stops
Mode Selector Assembly A2A1	Interchangeable with T-827B and T-827D	Interchangeable with T-827 and T-827D	Interchangeable with T-827 and T-827B	See Note 1
Translator/ Synthesizer Assembly A2A6	Not interchangeable	Interchangeable with T-827D	Interchangeable with T-827B	See Note 2
RF Amplifier Assembly A2A4	Not Interchangeable	See Note 3	See Note 3	See Note 3
Antenna Coupler ground pulse actuated	MCS switches, 100 KCS switch	MCS switches, 100 KCS switch	MCS switches, 100, 10 and 1 KCS switch	MCS switches, 100, 10 and 1 KCS switch
Front panel lamps can be changed from front	No	No	Yes	No
Chassis may be tilted 90 degrees when extended	No	No	Yes	No

• Note 1: A2A1A4R86 changed from fixed 10-kilohm resistor to 10-kilohm potentiometer to permit adjustment of CW carrier reinsertion in AN/URT-23 system.
• Note 2: A2A6A6A1R60, 500-ohm potentiometer, added to rf translator board to compensate for hi-lo-band gain variations when used in AN/URT-23 system.
• Note 3: A2A4A38R6 changed from fixed 470-ohm resistor to 470-ohm potentiometer to compensate for gain variation when used in AN/URT-23 system.

T-827/URT - used in AN/WRC-1 - 500 Hz tuning
	==		NOTE: This transmitter has a T-827B badge but looks like a T-827 with 500 Hz tuning increment.
T-827A/URT - version manufactured by Elmer in Italy for NATO - manual - (100 cps steps)
100 Hz tuning
T-827B/URT - used in AN/URT-23 and AN/WRC-1B (100 cps steps)
	missing A1, A4, A5 modules
		==	==
T-827C/URT - need info
T-827D/URT - used in AN/URT-23 and AN/URT-24 - need info
T-827E/URT - used in AN/URT-23 - need info
Here is a tag that says "modified to T-827E"	It seems that T-827B were modified to T-1827E - they have the same modules Need more info		==
T-827F/URT - used in AN/URT-23A and AN/URT-24A - need info
T-827G/URT - used in AN/URT-23B and AN/URT-24B (now says Hz instead of cps) A2A6 "6-pack" synthesizer/translator was replaced by a plug-in circuit board assembly
			==
T-827H/URT - part of AN/URT-23C Note A5 location has moved and A2/A3 audio modules have been replaced by A21 assembly of 3 plug-in boards (A18, A19, A20).		Manual
			A2A6 synthesizer/translator
A2A21 audio assembly	A18, A19, A20 audio boards	A21 audio backplane assembly	==
T-827J/URT - part of AN/URT-23D J model has module layout like H model, but chassis wiring is different
			Damn all those plastic chains!
T-827K/URT - part of AN/URT-23E
			URT-23E with T-827K aboard BB-62
T-827L/URT - part of AN/URT-23F		Please send email if you have more info or photos
Harris RF-131 exciter also used with RF-110A (AM-3924/URT) amplifier
Manual pdf

T-827, RT-618, R-1051 Modules  -  - complete module interchangeability info

See also R-1051 page for information on chains and modules