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TRW
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Known as AutoManual System, the KL-43C was first fielded with the US
Armed Forces in 1989 [7].
In 1995 it was succeeded by the slightly improved KL-43F, which offers
support for a second language (French).
The entire KL-43 family was declared obsolete in May 2013 [5].
According to some sources, the Datotek XMP-500 is the export version
of the KL-43 [6]. Instead of the secret proprietary NSA algorithm, the
XMP-500 uses 56-bit DES, but is key compatible with the KL-43.
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KL-43 Initial design KL-43A Early version KL-43C Tactical ruggedized version KL-43D Regular version with small keyboard KL-43E High-volume version with full-size keyboard
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KL-43F Similar to KL-43C KL-43G Similar to KL-43D KL-43H Similar to KL-43E
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The KL-43C and KL-43F have a standard US/NATO 6-pin audio connector,
which is also known as U/329 or U-229. It allows the device to be
connected to a radio or to a printer.
Below is the pinout when looking into the connector.
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GND Ground AFI Audio into KL-43 (10-350 mW, 1200Ω) PTT Push-to-Talk (connects to GND) AFO Audio from KL-43 (20 mW, 134Ω) RXD Data into KL-43 (or CTS from printer) TXD Data from KL-43 (or Data to printer at 1200 baud)
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The KL-43D, E, G and H have a 5-pin 180° DIN socket for connection
of an acoustic coupler or a radio. Below is the pinout when looking
into the socket.
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AFI Audio to KL-43 (-3dBm to -5 dBm, 4kΩ) GND Ground AFO Audio from KL-43 (-9 dBm, 200 mV, 8Ω) GND Ground GND Ground
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KL-43D, E, G and H can be connected directly to an analogue telephone line
(PSTN) via the RJ-14 modular jack socket marked LINE. An extra RJ-14 socket
is available for connection of the existing telephone set (PHONE). Below is
the pinout when looking into the LINE socket.
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- unused P5 Connected to pin 5 of the PHONE jack RING 2-wire 600Ω balanced line TIP 2-wire 600Ω balanced line P2 Connected to pin 2 of the PHONE jack - unused
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STR STROBE D0 Data bit 0 D1 Data bit 2 D2 Data bit 3 D0 Data bit 4 D4 Data bit 5 D5 Data bit 6 D6 Data bit 7 D7 Data bit 7 - unused BUSY Printer busy - unused - unused - unused - unused - unused - unused - unused
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GND Ground GND Ground GND Ground GND Ground GND Ground GND Ground GND Ground GND Ground GND Ground GND Ground GND Ground GND Ground INIT Initialize - unused GND Ground - unused - unused - unused
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Model KL-43C01 Manufacturer TRW Year 1989 NSN 5810-01-318-0414 Languages English Message 2 × 2600 characters Connections U-229 Data RS232 (via U-229) Acoustic Built-in Speed 50, 75, 150, 300, 600, 1200, 2400, 4800, 9600, 19200 baud async. 1 Sync time 750 ms (400 ms for versions ≤ 1.7.0) Printer TP-40S via Serial I/O 1200 baud (U-229) Power 4 × AA-size Alkaline or NiCd battery Duration 24 hours (8 hours with NiCd) External - Standards NACSIM 5100A TEMPEST, MIL-STD-461 (A1b, A3, A4), MIL-STD-810. Enclosure Ruggedized die-cast aluminium Dimensions 168 × 95 × 43 mm Weight 900 g Cost ?
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Meets RS232C standard, except for risetime at 9600 and 19200 baud.
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Model KL-43D Manufacturer TRW Year ? NSN 5810-01-318-0415 Languages English Message 1 × 2600 characters Connections DIN, RJ14 Data Optional external adapter (300 baud) Acoustic External adapter (via DIN socket) Printer TP-40P via Parallel I/O (D-36) Power 4 × AA-size Alkaline or NiCd battery Duration 24 hours (8 hours with NiCd) External 12V DC adapter Standards FCC par 15 leel A Dimensions 267 × 140 × 38 Weight 800 g Cost USD 300 [4]
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Model KL-43E Manufacturer TRW Year ? Languages English Message 1 × 2600 characters Connections DIN, RJ14 Data Optional external adapter (300 baud) Acoustic External adapter (via DIN socket) Printer TP-40P via Parallel I/O (D-36) Power 4 × C-size Alkaline or NiCd battery Duration 72 hours (24 hours with NiCd) External 12V DC adapter Standards FCC par 15 leel A Dimensions 260 × 235 × 51 Weight 1400 g Cost USD 1000 [4]
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Model KL-43F Manufacturer EPI Year 1995 NSN 5810-01-376-7375, 5810-01-387-1642 Languages English, French Message 2 × 2600 characters Connections U-229 Data RS232 (via U-229) Acoustic Built-in Speed 50, 75, 150, 300, 600, 1200, 2400, 4800, 9600, 19200 baud async. 1 Sync time 750 ms Printer TP-40S via Serial I/O 1200 baud (U-229) Power 4 × AA-size Alkaline or NiCd battery External - Duration 24 hours (8 hours with NiCd) Standards NACSIM 5100A TEMPEST, MIL-STD-461 (A1b, A3, A4), MIL-STD-810. Enclosure Ruggedized die-cast aluminium Dimensions 168 × 95 × 43 mm Weight 900 g Cost ?
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Meets RS232C standard, except for risetime at 9600 and 19200 baud.
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Model KL-43G Manufacturer EPI Year ? Languages English Message 1 × 2600 characters Connections DIN, RJ14 Data Optional external adapter (300 baud) Acoustic External adapter (via DIN socket) Printer TP-40P via Parallel I/O (D-36) Power 4 × AA-size Alkaline or NiCd battery Duration 24 hours (8 hours with NiCd) External 12V DC adapter Standards FCC par 15 leel A Dimensions 267 × 140 × 38 Weight 800 g Cost ?
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Model KL-43H Manufacturer EPI Year 1990 Languages English Message 1 × 2600 characters Connections DIN, RJ14 Data Optional external adapter (300 baud) Acoustic External adapter (via DIN socket) Printer TP-40P via Parallel I/O (D-36) Power 4 × C-size Alkaline or NiCd battery Duration 72 hours (24 hours with NiCd) External 12V DC adapter Standards FCC par 15 leel A Dimensions 260 × 235 × 51 Weight 1400 g Cost ?
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Obtained from Jerry Proc in May 2025 `[1].
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- Jerry Proc and contributors, KL-43 Automanual Equipment
Jerry Proc's Crypto Pages.
Visited 30 May 2025.
- Wikipedia, KL-43
Visited 30 May 2025.
- NATO, NCI Agency, Kl-43F
NATO Information Assurance. Visited 2 June 2025.
- Lt. Col. David M. Fiedler, The KL-43: burst communication on a budget
Winter/Spring 1990. pp. 42-47.
- DIN Digest, May 2013
UK Department of Defense, May 2013.
- Jerry Proc, Datotek XMP-500
9 April 2013.
- C4IEW and Sensors Project Book, Fiscal Year 1996
US Army, 23 May 1996. Page 36-13.
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© Crypto Museum. Created: Monday 02 June 2025. Last changed: Monday, 02 June 2025 - 09:50 CET.
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