TS-799/UGM-1 Teletypewriter Test Set

© Brooke Clarke 2007
TS-799/UGM-1 TTU Test Set
TS-799/UGM-1 TTY Test Set
Front
Rear when out of box



Background
Manuals
Front Panel
Rear Panel
Chassis 
Links

Background

In order to test not only the actual teletypewriter but also the associated modulator - demodulator (modem aka. Data Converter) and/or the actual loop some type of data generator is needed.  This test set is an all solid state design yet only has provision for 5 level code generation, not 5 and 8 bit.  Also provision for some rather slow baud rates. The paint scheme is light gray.  LOGSA has Technical Manuals but the -12 is not public accessable.

My hope is to be able to use this to exercise the Western Union 5A Stock Quotation ticker machine.

The test set chassis has covers on the top and bottom and then is inserted into the outer box which also has 5 faces.  The front panel has a lot of filtering.  Probably TEMPEST certified.

What I call "Golden Age" construction.  All discrete components.  Not even ICs., just transistors and diodes, no tubes.  Note the test message:
THE QUICK BROWN FOX JUMPED OVER A LAZY DOG'S BACK 1234567890 TESTING <Ltr><Ltr><Ltr><Ltr><CR><CR><LF><Ltr>
is generated using discrete components, no ICs, no EEPROMS just resistors, capacitors, transistors and diodes!

T
H
E
<SP>
Q
U
I
C
K
<SP>
B
R
O
W
N
<SP> F
O X
<SP>
J
U
M
P
E
D
<SP> O
V
E
R
<SP> A
<SP> L
A
Z
Y
<SP> D
O
G
<Fig>
'
<Ltr>
S
<SP> B
A
C
K
<SP> <Fig> 1
2
3
4
5
6
7
8
9
0
<SP> <Ltr> T
E
S
T
I
N
G
<Ltr> <Ltr> <Ltr> <Ltr> <CR> <CR> <LF> <Ltr>
A 4 character call sign can be programmed at the end of the test message allowing the TS-799 to be connected to a transmitter for generating over the air Quick Brown Fox messages.

------------------------------------------ email from Rich ------------------
We used the AN/UGM-1 in our COMMEL MAINT SECTIONS to test/repair the
TT-98, TT-76, TT-4, TT-100, UGC-4, and more of the Klienschmit type of
equipment that we had............

Our COMSEC REPAIR SECTION also used them to repair/test the TTY CRYPTO
equipment.

RICH @B> }
----------------------------------------------------------------------------

The Technical Bulletin has this description:
Descriptive Data. Teletypewriter Test Set TS-799/UGM-l is a transistorized test set, consisting of three main functional circuits: the test message generation logic, the distortion generation logic, and the output circuits. Additional data is listed in a, b, and c as follows:

a. Identification.
Nomenclature . . . . . . . .Test Set, Teletypewriter TS-799/UGM-1
National  stock number 6625-975-0196
Size. . . . . . . . . . . . . .8 3/32 x 17 1/8 x 8 7/16 in. (more like 10.5" x 10.5" x 21" deep
Weight . . . . . . . . . . . . . ..21 lb
References . . . . . . . . . . . .TM 11-6625-620-12  TM 11-6625-620-45-1

b. Specifications.
Output signal pattern . .. . . . . .Test message (“quick brown  fox” message);
                                                 selected characters, reversal (dot cycle)
Output signal reversal (dot cycle) speeds . . . . . . . . . . 100, 75, 37.5, 37, 23 Hz,
Test message, alternate R  and Y characters selected characters. . . . . . . . . ..7 unit code at 45 or 150  baud
                                                                                                                        7.6 unit code at 45, 50, 74 or 75 bauds
Signal distortion available. . . . . . . . . . . . ..Mark bias, space bias, space end mark end
Percent of signal distortion available.......... 0 to 50%
Accuracy of signal distortion output . . . . . . . . . . . ± 2%
Types of output current:
    Neutral operation, internal supply. . . . . 20 milliamperes (mA); 60 mA
    Neutral operation, external loop used . . . .  60 mA, maximum
    Polar operation, external batteries required . . . . . .  30 ma
Power Requirements:
Voltage ............... 115 or 230 volts ac +/- 10%
Frequency ...........50 or 60 Hz

c. Calibration.
Time Required ................ <? nothing here>
Technique ...................... DC-low frequency
Interval .........................In accordance with TB-43-180

Manuals

TB 11-6625-620-35-1 Calibration Procedure for  Teletypewriter  Test Set TS-799/UGM-1
Headquarters, Depatment of the Army, Washington D.C.
13 August 1976 <including Change 1>

TB 11-6625-620-35-2 Calibration Procedure for  Teletypewriter  Test Set TS-800/UGM-1

Descriptive Data.
The Teletypewriter Test SetTS-80/UGM-1 (distortion analyzer) indicates the amount of distortion present in a start-stop telegraph signal and compares the position of the input signal transitions to an accurate time-base signal that is generated in the time base circuits, and indicates whether the signal transitions are occurring at the correct time, early, or late. Additional data islisted in a, b, and c as follows:

a. Identification.Nomenclature . . . . . . . Test Set, Teletypewriter TS-800/UGM-1
National stock number . . . . . . . . . . . . . 6625-965-0197
Size  . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-23/32x17-1/8x8-7/16 in.
Weight . . . . . . . . . . . . . . . . . . . . . . . . . 17-1/2 lbs
References  . .. . . . . . . . . . . . . . . . . . . .TM 114625-62045-2, TM 11-6625-620-12

b. Specifications.
(1) Types of input
Neutral operation . . . . . . . . current.20 mA; 60 mA
Polar operation . . . . . . . . . . . 30 mA; polar
Input rate acceptance . . . . . 7-unit code at 45 and 150 bauds;
                                             7.5-unit code at 45, 50, 74 and 75 bauds;
                                            dot cycles at 23, 37, 37.5, 75, or 100 Hz
(2) Types of distortion indicated.
Types of distortion are total peak, early peak, late peak and average for mark-to-space or space-to-mark transitions.

(3) Distortion indicators.
The percent distortion meter is a 250° front panel milliammeter calibrated 0% to 50% (±2%) with a 1 mA sensitivity at 53 millivolts.  Meter resistance is 53 ohms.  There is one EARLY indicator lamp and one LATE indicatorlamp.

(4) Power requirements.Voltage . . .  . . . . . . . .115 or 230 ± 10 volts ac, single phase
Frequency . . . . . . . . . . . . . . . . 50 to 400 Hz
Power consumption . . . . . . . 16.5 watts

Refers to the TS-799 as a Pattern Generator

TM 11-6625-620-40P-1 General Support Maintenance Repair Parts and  Special Tools Liist for Test Set, Teletypewriters TS-799/UGM-1 and TS-799A/UGM-1, TS-799/UGM-1 and TS-799A/UGM-1(NSN 6625-00-965-0196)
Headquarters, Department of the Army
28 FEBRUARY 1979

TM 11-6625-620-12, Test Set, Teletypewriter AN/UGM-l - not public

TM 11-6625-620-20P, Test Set, Teletypewriter AN/UGM-l - not public

TM11-6625-620-45-1,TestSet, Teletypewriter TS-799/UGM-l - not public

TM 11-6625-620-20P Organizational Maintenance Repair Parts and Special Tools List for Teletypewriter Test Set AN/UGM-1(NSN 6625-00-967-0195)
Headquarters,  Department of the Army
28 February 1979

Components of UGM-1
TM 11-6625-620-45-3 GS, and  Depot Maintenance Manual, Test Set, Relays TS-836/UGM-1
HEADQUARTERS,DEPARTMENTOF THE ARMY
20 NOVEMBER 1967
TM 11-6625-620-40P-3  General Suppoer Maintenence Repair Parts and Special Tools List for Test Set, Relay TS-836/UGM-1(NSN 6625-00-077-2986) (EIC: KHH)
*This manual, together with TM 11-6625-620-20P, dated 28 February 1979, superxedes TM 11-6625-620-25P-3, dated 26 August 1976.

Note the TS-836 uses  +100 volt and  -100 volt power supplies to drive the relays.

Front Panel

Label

Test Set TTY TS-799/UGM-1
Serial No. 21
Order No. FR36-039-B-4-45308(E)
Stelma, Inc. Stamford, Conn.
U.S.

RATE

There are two ranges on the switch.  The top range is the baud rate slection.
45.5 baud & 7.0 units, i.e. start and 1.0 stop bits
45.5, 50, 74.2 or 75 baud & 7.5 unit code, i.e. start and 1.5 stop bits
150 baud & 7.0 units, i.e. start and 1.0 stop bits

The bottom range is the dot cycles slection.
23, 37, 37.5, 75 or 100 dot cycles

MESSAGE SELECT

% DISTORTion

variable 0 to 50%

DISTORT SELECT

MESSAGE TRANSMIT

ON or OFF  (OFF for continous Mark)

CURRENT SELECT

20, 60, 30 POLAR, EXT PWR
These are common loop currents in ma.  But it's not clear how to use the EXT PWR connection.  For example what can this be used for neutral or polar keying, what sets the loop current, what limits are on the external power supply in terms of voltage so that the TS-799 modulator is not damaged.  Works with the rear panel screw terminals for:
 - Batt, Com,+ Batt.

POWER

The front panel power switch is a center off, up for 230 VAC on and down for 115 VAC on with a metal gate (like a Ferrari transmission) where the gate can be positioned for either 115 or 230 volt operation.  A MO C7A neon bulb is behind the red plastic pilot light lens.  Dual fuses and spares mounted on the front panel.

SIGNAL OUTPUT

A ¼" insulated phone jack is used for the output.

Rear Panel

In order to have Polar output two external floating power supplies need to be connected to TB1.
Positive External Battery to terminal 1.
External Battery Common to terminal 2.
Negative External Battery to terminal 3.
Terminal 4 is Signal ground.
Terminal 5 is Chassis ground.

J2 is a MS 3112E 12-3P Same connector as front panel AC so probably for AC input, but why?
Maybe the TS-799 and TS-800 can be fitted into a single outer box and the AC is daily chained?
F3 & F4 are 0.125 Amp fuses, maybe in the TTY loop.
2A1TB1 is a screw type terminal strip with 5 positions:
Ext Batt +, COM, Ext Batt -
Signal Ground
Chassis Ground

Assy 2A3 has porbe socket test points for:
J1    +15 V (+/- 0.25 volts)
J2    GRD
J3   -15 V (+/- 0.25 volts)
J4   +130 V (+/- 6.5 volts)
J5   -130 V (+/- 6.5 volts)

The power transformer has a dual 115 VAC primary and three output windings:
24.2 V @ 35 ma
27 V @ 200 ma
125 V @ 100 ma

Chassis

TS-799/UGM-1 Top inside view

In addition to the front panel there is 2A1A1 PCB that's related to the front panel with 3 ea 2N1305 transistors and 12 ea caps selected at test.
The power supply box has PCB 2A3A1 shown photo left, instrument rear..









There are 19 plug-in printed circuit boards.
Board
Function
Transistors
Diodes
Other
A1
Power Supply
A2
Distortion Ctrl
8 ea 2N305
0
-
A3
Distortion Gen
9 ea2N1305
1 ea 2N1304
2 ea 1N457
4 ea  1N270
-
A4
Output Drivers
2 ea 2N349
7 ea 2N1305
2 ea 1N270
Transformer 6 term
A5
Baud Counter
14 ea 2N1305
28 ea 1N270
-
A6
Msg combiner
12 ea SMB954336
0
-
A7
Msg combiner
11 ea SMB954336 2 ea 1N270
-
A8
Timing Gen
10 ea 2N1305
0
-
A9
Extender board
0
0
22 terminals
A10
Tens Counter
6 ea 2N1305
0
-
A11
Msg Xistors
10 ea 2N1307
0
-
A12
Msg Xistors "
0
-
A13
Msg Xistors "
0
-
A14
Msg Xistors "
0
-
A15
Msg + 4 Call Char1 res
2 ea 2N1305
0
~ 200 resistors
A16
Msg res
"
0
-
A17
Msg res
"
0
-
A18
Msg res
"
0
-
A19
Units Counter
10 ea  2N1304
12 ea 2N1305
0
-
Note 1 - Four call characters (letters or figures) can be programmed using a soldering iron

Links


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page created 7 Sep 2007.