TS-799/UGM-1 Teletypewriter Test Set

------------------------------------------ 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> }
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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

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

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

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

variable 0 to 50%

•  BIAS: MARK
• BIAS:  SPACE
•  END: MARK
• END:  SPACE

ON or OFF  (OFF for continous Mark)

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.

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.

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

Maybe the TS-799 and TS-800 can be fitted into a single outer box and the AC is daily chained?