TSEC/KY-65 Narrow-band Secure Voice Unit

HYX-65-1 Wire-line Adapter Local Unit

Brooke Clarke 2007



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TSEC/TSEC/KY-65
                    Narrow-band Secure Voice Unit
TSEC/TSEC/KY-65
                    Narrow-band Secure Voice Unit
TSEC/TSEC/KY-65
                  Narrow-band Secure Voice UnitHold Up Battery
                  Compartment
under the stenciled 81 is a small
red "X" which is the
shoot me here mark
Front Panel
positions for two BA-1372/U
one is a spare

KY-65
    Background
    Description
    Radio Connector
    Cables
 AM-6747
HYX-65-1
Patents
Links

KY-65

Background

If you have any information on the KY-65 please let me know.

This is a voice encryption unit that's made to work on H.F. radio circuits.  The KYV-2, KY-8, KY-28, KY-38 and KY-57, KY-58 are designed to work in a 25 kHz wide channel on VHF or UHF frequencies where the propagation conditions are much different than what's found in the H.F. band.  The PRC-104 is one of the H.F. radios that was used with this box.

The packaging is derived from the PRC-25 radio (which is also the PRC-77).  It uses the CY-2562/PRC-25 battery box and so can use any of the batteries that fit this box including my 257477BA battery Adapter.

Also used with the AN/PSC-3  UHF satcom terminal.
There were KY-65A and KY-65(E-1) versions per AF Instruction 21-109 1 Oct. 2000.

A note in relation to the AN/GRA-39 RFI modification.
Laboratory tests verify the reported susceptibility of the AN/GRA-39 to powerful hf fields. Instability results from detection of the envelope of an AM signal by the remote unit microphone amplifier input circuit. The modification reduces the rf vulnerability of the remote unit by 40-60 dB over the 2-30 MHz band. The modified AN/GRA-39 is shown to be operationally compatible with the TSEC/KY-65 narrow band secure voice unit.

Description

What's left of the internal wiring on the back of the front panel is all white wires.  There's an interlock switch that will be opened if the front panel is removed from the box.

On top of the box there is a stencil "M28111" and just under the first "1" is a small red "X" which is the shoot me here mark for destroying the heart of the unit. under the M28111 is "RED BANK".  Note that Fort Monmouth and Red Bank are both in New Jersy.

FM 24-19 Section IV has info about using the KY-65, 2 ea. BA-1372 HUBs, CX-13168 cable between the RT-1209 upper AUDIO connector and the KY-57 RADIO connector. Z-AKE is an AC/DC power supply for the KY-65. CX-13211 cable between the KY-65 AUDIO connector and the AUDIO connector on the AM-6879 Amplifier-Converter.  Handset to AUDIO connector on KY-65.

In a vehicle installation the cable from the J-4885/GRC Junction Box goes to the speaker connector on the Amp-PS. The H-250 handset connects to the J-4885 HANDSET connector.  An LS-454 Speaker connects to the Speaker connector on the J-4885

Less than 10.2 volts causes a battery fail condition.  This is consistent with a 10 to 15 Volt range for a "12 Volt" supply and the CY-2562 battery box.  I wonder if the nomenclature means "25" for the PRC-25 and "62" for the year?

The KY-65 uses the Parkhill algorithm as does the KY-75 (Jerry Proc) aircraft version. The KY-65 and KY-75 may be the only Parkhill machines?  If someone talks too fast then the message gets garbled.  This is because the output needs to have a narrow (3 kHz) bandwidth to work with HF radios.  A fast talking person will exceed 3 kHz bandwidth.

It think this system divides the 300 to 3,000 Hz voice band into 9 sub bands each 300 Hz wide.  The signal in any of the 9 bands can be changed to any of the other bands either as is or inverted.  So there are 18 things that can be taken 9 at a time or 18!/(18-9)! = 17.6 billion.  Note that the key is a fixed permutation of the sub bands and does not change with time like the more modern voice encryption systems, so no date - time input is needed.  It may be related to U.S. patents 2183248 & 3012098 assigned to Bell Labs?

KY-65 controls: & Indicators

INT BAT / AUDIO / EXT BAT works with the analog panel meter, upper scale 0 to 1.50 Vrms, lower scale 0 - 3.0 Vrms and near the center of the scale a green band for the battery check.
OFF / ZEROIZE / STANDBY / ON - standby uses the external DC power for keep alive, saving the HUB batteries.  You need to pull up the knob to bet into or out of ZEROIZE.
PLAIN / CIPHER
VOLUME
FILL SELECTOR allows selection of one of three keys
DELAY OUT / DELAY IN / SIG CLEAR - not sure?
HF / NON HF - H.F. has propagation problems that are not present on phone circuits.
Amber Light - "SIG/CIPHR RCV" - filament lamp "JKL 345" - would indicate an encrypted incoming message, but why?
Uses two each BA-4386 batteries, one active and one spare (also active and spare fuses).
HANDSET & FILL - standard U-229 type with 6 pins.
RADIO - 1" O.D. 26 male pin circular connector (the KY-38 also has a 26 male pin RADIO connector)  It's likley that the pinouts are the same.  There may even be cables that work with either the KY-38 or KY-65 and a radio or phone box.

The KY-99 Miniterm replaces the KY-65 for voice security.

J1 Radio Connector

Pin
Function
A
PT in
B

C
Gnd
D

E

F

G

H

J
Gnd
K
PT out
L

M Gnd
N PTT
P
R
S
T Gnd
U
V
W
X
Y
Z
a

b

c


Cables

CX-13138/U - "Y" type with 1 socket circular connector that mates to the Z-AKE power supply, a 4 male pin connector that mates with the AM-4749 amplified speaker and a 4 socket connector that may mate with a crypto junction box to pick up clear text audio.

CX-13168
CX-13211
KY-99 Cable might have commonality with KY-65?
NESA N00140-92-C-AB15, RT-1209 to KY-99, 29357-46923-202014-24
The RT-1209 end goes to an AUDIO connector on the RT and has a 5 contact U-229 type connector, except it looks to be TEMPEST rated.  KY-99 end that attaches to the RADIO connector is a MS27467T11B35S.  This is a 13 Socket connector.  This cable has a 1992 contract date, so the KY-99 was supported at least this early.
KY-99
RT-1209
1

A
2

B
3

C
4

A
5

D
6

A
7

n.c.
8

n.c.
9

n.c.
10

n.c.
11

n.c.
12

n.c.
13

n.c.

AM-6747 Speaker NSN5895-01-056-4553

This speaker was made specifically for the KY-65.  It came out 24 Sep 1976, went inactive 2 Oct 1989 and was canceled 29 Mar 1996.  It might be fair to assume that the KY-65 came out about the same time and that the KY-65 was replaced about 1986 by the KY-99.

The speaker runs from either "24 Volt" Vehicle power using an internal voltage regulator or from a clean 12.0 +/- 0.7 VDC depending on how the power connector is wired.  Schematic on Jerry Proc's web page.

It's composed of an LS-454 with an added amplifier and a relay that prevents clear text from being heard on the speaker.  You would not want to be using a PA system to be giving out the clear text.  That's probably why the speaker was made.

It's similar to the AM-4979 Speaker that's for use on non encrypted radios.

HYX-65-1 Wire-line Adapter Local Unit

Front Panel Controls & Indicators

Console rotary Switch (& Indicator lights): Secure (Green) or Normal (Red)
Toggle switch: Remote or Telephone
Amber Indicator: Cipher or Rcv
J2 SMA jack Cipher Indicator
J1 KY-65/75 - 8 sockets (MS3112E 12-8S)
1-1/2 Amp fuse & spare
Mode rotary switch (&amber pilot lamp): Off, AC, Ext DC, Int Batt.

Rear Panel Controls & Indicators

Toggle switch: 230 VAC or 115 VAC
J3 POWER connector 10 male pins (MS3122E 12-10P)
J5 ____?_____ 8 male pins (12-8)
J4 ____ ? ____ 10 female sockets (12-10)
Wire-line push-down jack field
    PTT: E & F
    Coupler: B & C (2-wire or 4-wire)
    Remote Audio I/O, Key Relay (B & C)
    Phone System: B & C(2-wire or 4-wire)
Toggle switch: 4-Wire or 2-Wire
Toggle switch: Input Level: 0 to -36 dBm or -9 to -45 dBm

Label

Local Unit
HYX-65-1
Assy No. 0N288083-1
Serial No. ----
Mfr Code No. 26687

Inside

There appears to be an internal battery in it's own metal box.
PCB sockets J6 & J7 are empty, maybe demiled or maybe an option no installed.

It's my understanding that the U.S. military no longer buys products with internal batteries.  When the battery goes dead the unit needs to be scrapped since most manuals do not cover battery replacement.  This battery measures about 20 mV, I expect it's should be more like 14 VDC.

Fig 1 Front Panel
HYX-65-1
                  Wire-line Adapter
Fig 2 Label
HYX-65-1
                  Wire-line Adapter
Fig 3 Rear Panel
HYX-65-1
                  Wire-line Adapter
Fig 4 Rear Panel
HYX-65-1
                  Wire-line Adapter
Fig 5 Inside
HYX-65-1
                  Wire-line Adapter


Patents

This is just a guess on my part.

2151091
2183248 Wave Translation, R.R. Riesz (Bel Labs), Dec 12 1939, 381/61 ; 333/28R; 380/39; 472/64; 704/205
2238555 Voice Operated Mechanism, H.W. Dudley (Bel Labs), Apr 15, 1941, 379/88.01 ; 361/183; 367/135; 367/198; 379/282; 379/286; 704/275-
10 narrow channels looks like crossbar phone switch
2243090 Sound Record, H.W. Dudley (Bel Labs), May 27, 1941, 369/272.1 ; 369/4; G9B/5.308- allows voice modulation of natural sounds, maybe SIGSALLY related
2243525 Production of Artificial Speech, H.W. Dudley (Bel Labs), May 27 1941, 704/268 - plungers to control reasonance, mixes in noise
2243526 Production of Artificial Speech, H.W. Dudley (Bel Labs), May 27 1941, 704/209 - includes both analysis and synthesis of speech
2243527 Production of Artificial Speech, H.W. Dudley (Bel Labs), May 27 1941, 704/268 ; 324/76.31; 704/208- analysis of input speech allowing sending in narrow bandwidth
3967067 Secret Telephony, R.K. Potter (Bell Labs), Filing date: Sep 24, 1941, Issue Date: Jun 29, 1976 (35 Years held as top secret), 380/41 ; 380/40; 704/205
Calls:
1310719 Secret Signaling System, G.S. Vernam (AT&T), Jul 22 1919, 380/33 ; 380/259; 380/26 - TTY mixes two aphabets
1829783 Method and System of Secret Signaling, R.W. Chesnut & H.J. Fisher (Bell Labs), Nov 3 1931, 380/33 ; 380/38- voice uses sub band scrambling
2213320 Privacy System, R.C. Mathes,E. Peterson, H.W. Dudley (Bell Labs),  Sep 3 1940, - audio sub bands commutated by RTTY distributor
2243527 <see above>
 
Post Vietnam KY-57, OTAR, SICGARS Patents

Links

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