Background
Description
AM-6747
Radio Connector
Cables
Patents
Links
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
narrowband 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 numenclature
means "25" for the PRC-25 and "62" for the year?
The KY-65 uses the Parkhill algorithim. 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.
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.
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. |
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
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06084 hits since May 15 2007 page created 15 May
2007.
