Hal Communications ST-6000 User manual

STI6OOO
FSK
DEMODULATOR
INSTRUCTION
MANUAL
HAL COMMUNICATIONS CORP.
BOX 365
URBANA, ILLINOIS 61801
QUALITY CO M M U NICANONS EQ U I PM ENT

STI6000
FSK
DEMODULATOR

HAL 5T-6000 FSK DE|VIODULATOR / KEYER
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Copyright @ 1976 by HAL Communications Corp., Urbana, I I I inois.
Printed in the United States of America. All rights reserved.
Contents of this publ ication rnay not be reproduced in any form
wi thout the wr i tten permi ss ion of the copyr i ght owner.
February, 1982 Printing

2. SPEC IF ICAT IONS
CONTENTS
}. INTRODUCTION
3. I NSTALLATI ON
3.1 lnitial
3.2 Use of
3 .2.1
3.2.2
) .2.3
) .2.\
3 .2.5
3.3
4.4
4.5
l+.6
t+.7
I{.8
[.9
4. l0
4.lt
\.12
I{. 13
HAL ST.5OOO DEMODULATOR
lnspection . . . . : . . . . o , . . . . .
Factory Supplied Cables . . . . . . o . .
Audio lnput Connection. . . . . . . . . . .
l-l
2-l
3-l
3-l
3-2
3-2
3-2
3-2
3-4
3-4
3-7
3-7
3-7
3-7
3-B
3-8
3-9
3-9
3-9
3-l I
3-l I
3- 13
Audio 0utput Connection
t-oop I Cable Connection
Motor Power Connection.
KOS Cable Connection.
Separate Keyboard Connection. . . . . . . .
RS-232CCableConnection...... . o
CW lD Key Cable Connection.
AC Power Cord Connection.
Ground Connection r . . . . . . . . . . . .
Connection to the ST-6000.
Use of External Loop Suppl ies and
Mul tiple Loop Ci rcui ts.
Separate Printer and Keyboard Connections
Full Duplex 0peration of the 5T-6000. .
External Data Prpcessing Equipment. . .
External 0scilloscope Connections . . . .
Tone Keyer Control Connections. . . . . .
a.a.a.ara.
a.a.a.a.a.
q. I{.1 Front Panel Control s and lndicators.
3.2.6
3 .2.7
3 .2.8
3 .2.9
3.2-lo
Al ternate
3.3.1
3 .3.2
3 .3.3
3.3.\
3 .3.5
3.3.6
4.3, I
\.j.2
\.3.3
Use of the DTH C i rc
Use of t he L im i ter.
Use of the SENSE Sw
Use of the PRINT Sw
The KOS Circuitry.
Use of the Autostar
Ant i space Ci rcu i t.
Switch
i tch.
i tch.
FM vs Al4
I.a.a.a-.a.a.a.a.a
tCircuitry.......o..
\.2 Simplified Operating Procedure. . . . . . o . . . .
4.3 Reception of Radio Teleprinter Signals. . . . . . .
Receiver for FSK Reception. . i G . . . . .
Receiver for AFSK Reception . . . . . . . .
Tuning a RTTY. Signal. . . . . . . . . . . .
4-l
\-2
\-3
\-3
4-5
4-5
4-7
4-8
4-8
4-9
4-9
4- r0
4-t r
Use of the ATC Circuit . . . . .-. . o . . . . . . .
| - . . . \-7
Tone Keyer Clrcuit . . . . . . . . . . . . . . . r 4-ll
Transmitting Radio Teleprinter Signals . . r . . . . 4-12
4.13.1 Transmitting FSK Signals. . . . . . . o . ; 4-lZ
\.13.2 Transmitting AFSK Signals . . . r . , . . 4-ll{
4.13.3 Adjustment of the 5T-6000 Tone Keyero . . . 4-14
tt

5. ST-5OOO CIRCUIT DESCRIPTION . . . . . . . . . . . .
5.1 ST-5000 Arralog Processing Circuits lnput Circuit
Board. . . . . . . . . . . . . . . . .
5.1.1 lnput AGC Circuit . . . . . . . . o . . . .
5.1.2 lnput Bandpass Filters. . . . . . . . . . .
5.1.3 Limiter Amplifier . . . . . . . . . . . . .
5.1.4 Discriminator Filters. o.... ....
5.1.5 Discriminator Detectors . . r . . . . . . .
5.1.6 A/S Amplifier and Detectors . . . . . . . .
5.1.7 Active Lowpass Filter . . . . . . . . . .
5.1.8 ATC Circuit . . o . . . . . . . . . . o
5.1.9 Tone Keyer. . . . . . . . . . . . . . . . .
5T-6000 Control Circuit Board. . . . . . . . . . . .
5.2.1 Slicer and DTH Circuits . . . . . . . . . .
5.2.2 Ant ispace C i rcu i t
5.2.3 Pre-autostart Data
5.2.\ Autostart Circuit . . . . . . . . . . . . .
5.2.5 Standby Circuit . . . . . . . . . . . . . .
5.2.6 Post-autostart Data 0utput. . . . . . .
5.2.7 Loop Keyer Stages o . . . . . . . . . . . .
5.2.8 RS-23z/MlL-l88 tnterfaces . . . . . . . .
5.2.9 KOS Circuit . . . . . o . . . . . . . . . .
5.3 Front Panel lndicators . . . . . . . . . . . . . .
5.\ Power Supply . . . . . . . . . . . . . . o . . . . .
5.5 Oscilloscope . . . .
5.6 CabinetWiring . . . . . . . . . . . . . . . . .
5.7 User Servicing
5.8 TroubleshootingGuide.. ... ....
APPENDIX A: RF-lnduced Problems . .
WARRANTY
5-l
5-l
5-l
5-r
5-r
5-2
5-z
5-z
5-2
5-3
5-3
5-\
5-t1
5-l{
5-\
5-5
5-5
5-6
5-6
5-7
5-7
5-8
5-B
5-9
5-9
5-10
5-l1
6-t
7-1
5.2
0utput.........
tll

HAL ST-5OOO DEMODULATOR
ST-5000 Front Panel Controls . c . . 4-l
ST-5000 Front Panel lndicators . . . . . . \-2
Figure IST-5000 Demodulato. (photo)
TAA LE S
Table 4.1
Table \.2
I LLUSTRAT I ONS
Figure 3.1
Figure 3.2
Figure 3.3
Figure 3.\
Figure 3.5
F i gure 3.6
Figure 3.7
F i gure 5.1
Figure 5.2
Figure 5.3
Figure 5.\
Figure 5.5
Figure 5.6
Figure 5.7
Figure 5.8
Figure 5.9
Figure 5.10
Figure 5. I I
Fi gure 5.lZ
Fiqure 5. I3
Figure 5.1\
Figure 5.15
Figure 5.15
Figure 5.17
Figure 5. lB
ilstandard" Cabl e Connect ions to the ST-5000
Loop Connections to the ST-5000 . . . . . . . . . . . o
RS-232 l/0 Connections to the ST-5000. . . . . . o . . .
Preparation of the 5T-6000 Connectors . . . . .
Alternate Loop Connections . . . . . . . . . . . . . .
Connections for Full-Duplex Operation ! . . . . . . . . .
Connect ions to Externa I Data Process i ng Dev i ces . . . .
5T-6000 BlockDiagram . . . . . . . . . . . o . .
ST-5000SchematicDiagramConventions.......
lnput AGC Circuit . . . . . . . . . . . . o . . .
lnput Bandpass Filter . . . . . .
Limiter Amplifier . . . . o . .
Discriminator Filters . . .
Discriminator, Meter Amp., Lowpass Filter, Atc . . .
ToneKeyer................o
Slicer, Antispace, Autostart . . . . o . o .
LoopDrivers, LoopSense ... o.. ..
RS-23?/lllL-lBB lnterface . . . . . . . . . . . .
KOS Circuit . . . . . . . .
PowerSupply..........
0sci I Ioscope.
lnput Circuit Board Layout . . . . . . . . o . o . .
Control Circuit Board Layout . . . .-. . . . . . .
Oscilloscope Circuit Board Layouts . o . . . . . .
Ci rcuit Board lnterconnections
IV
3-3
3-5
3-6
3-9
3- I I
3- 13
3-15
5- 14
5-i5
5- 15
5-17
5-18
5- 19
5-20
5-21
5-22
5-23
5- 2\
5-25
5-25
5- 27
5-28
5-29
5-30
5-31

I, InrnoDUCTroN
The Hal Communications Model ST-5000 is a high performance FSK
demodu Iator and tone keyer des igned for use with rad io tel epr inter systerrs.
The ST-5000 incorporates the features and performance characteristics of
previous HAL demodulators as wel I as offering some features previously
not avai lable.
The ST-5000 is an audio tone type of demodulator and keyer. Audio
tones from the receiver, representing the "markrr and ilspace" teleprinter
code states, are converted into keying pulses by the demodulator section.
Active input and discrinrinator filters are used in the ST-5000 so that a
wide range of input f requenc ies can be accomodated . Turo standard aud io
tone sets are normal Iy stocked by the factory and special tone sets within
the 1200 3000 Hz frequency range are available on special order. The
standard tone sets are based on a mark frequency of 1275 Hz ("low-tone"
set) or a mark frequency of 2125 Hz ("high-tone" set) for frequency shifts
of l7O H2,425 Hz, and B5O Hz. The tone keyer section of the ST-5000
generates the same set of tones for transmitting in addition to a narrow-
shift tone for Morse code identification.
The demodulator uses a pre-filter agc system, oR active bandpass
filter, a high gain, wide bandwidth limiter, and active detector circuits.
This combination gives outstanding performance for a wide range of input
signal apl itudes even in the face of strong interfering signals. The
Iimiter stage gain can be reduced for non-limiting operation ("AM"). The
pre-f ilter agc and active detectors also assure improved non-limiting per-
formance when compared to previous demodulators. A three pole active lot',,pass
f ilter follows the detector stages to reduce the post-detection noise bandwidth.
An Automatic Threshold Correction (nfC) circuit can be switched into
the signal chain to provide correction for bias distortion generated by
the propagation path. This feature can also be defeated with a front
panel switch if desired. A Decision Threshold Hysteresis (0fH) circuit
can also be switch selected to provide correction for multi-path propagation
d i stort ion of the tel epr i nter s i gna I
CM0S digital circuitry is used to provide the Jutomatic printer and
motor control as wel I as the ant i space feature. The 5T-6000 autostart
circuit senses the presence (or absence) of a val id teleprinter signal.
lf the input signal is not recognized as a teleprinter signal, the printer
is held in the rrmark-hold'r cond it ion. I f more than twenty seconds pass
without recognition of a valid signal, the pc\{er to the printer motor is
removed. The response t ime of the autostart c i rcu it is srvi tch selectabl e
to allow "FASTT' (1.5 sec.) or "SL0W" (3.5 sec.) response. An antispace
circuit is also included in the digital control section that I imits the
duration of a space signal to 250 ms or Iess, preventing the "running-
open" mach i ne cond i t ion on cont i nuous space tones.
As mentioned earl ier, the tone keyer section generates the same tone
set as is used in the demodulator section to assure true "transceive"
conditions. The tone keyer will also generate an additional narro\^r-shift
tone that can be connected to an externa I keyer c i rcu it for Mc,,rse code
I-t

identif icatiorr. AII tones of the tone keyer are derived from high fre-
quency crystal controlled oscillators. The output signal is a low dis-
tortion sinewave generated in a digital-to-analog converter and then
f iltered in an active low-pass f ilter. A wide range of output ampl itude
(into 500 ohnrs) it available f rorl the ST-5000, adjustable with an internal
control. Unlike previous demodulators, the tone keyer data input circuit
is not internal Iy connected to the demodulator but is available on a rear
panel connector. Thus, separate transmit and receive circuits (full-duplex)
can be accomodated by the Sf-6000. Conversel y, wi th appropr i ate rear-panel
jumpers, the tone keyer can be connected to the demodulator for a common
transmit receive circu it (lralf -duplex) ut was the case for the ST-5
demodulator. However, the shift of the tone keyer is controlled by the
f ront panel SH IFT switches. Al so, the SEIISE switch (tlOnm REV) controls
both the tone keyer as well as the demodulator.
The 5T-6000 input and output circuits have been designed to allow a
maximum of user flexibility. Many signal and control lines have been
brought-out to rear panel connections. Both pre- and post-autostart data
signals are available on the rear panel as are the inputs and outputs of
two separate high-level loop switches. fhe internal 175 volt, 50 ma Ioop
supply is also connected to the rear panel. Thus, the demodulator output
can be used to directly key the loop or be first passed through additional
signal processing (such as the popular UART and digital control devices),
and then routed back through the ST-5000 keyer stages, with the option of
using or not using the internal loop supply of the 5T-6000. tn addition,
the ST-6000 has both output and input signal connections that are compatible
with both the ilA - RS-232C and MIL-STD-IBBC data signal Ievels.
The ST-6000 also includes a Keyboard Operated Switch (fOS) circuit
that can be used to automatically switch the transmit receive cont;-ol
circuitry of the station. fhe f..0S circuit senses teleprinter keyboard
and CW identification signal status. lf either the keyboard or the
CW-lD key is used, the K0S switching transistor turns "0|J" (low impedance to
groun,j). The KOS circuit also places the 5T-6000 demodulator circuits in a
"standby'r status to prevent feedback from the receiver whi le transmitting.
The NPN K0: switching transistor can be used to control a DC relay that is
supplied f rom a positive voltage source or a push-to-talk (PTT) control I ine
in a transn'ritter (providing the PTT Iine is derived from a positive DC source.)
Since the K0S sensing I ine is connected to the rear pan6l, it can also be
t r i ggered by externa I dev i ces .
The aud io input to the dt,modu lator and the aud io output f rom the
tone keyer are both 500 ohms balanced (o. unbalanced if jumpered) with
respect to gr,:u:,d and use aud io transformers to maintain DC isolation.
The oscilloscope signals for a crossed-ellipse oscilloscope display are
connected to a rear panel connection. The ST-5000 is furnished with
a front pane I tun i ng osc i I I oscope.
lnternal , e lectronical ly regulated + 12 volt power suppl ies provide
operating voltages for the demodulator, control, and tone keyer sections
of the 5T-6000. A 175 volt, 50 ma. loop power supply is also included
as a part of that option. fhe main power transformer of the ST-5000 can
l-2

be connected for operation with either 105 to 125 VAC or 210 to 25a VAC,
50 or 50 Hz power sources. Both the power line and the loop power supply
are fused with fuses accessable from the rear panel of the unit. The
5T-6000 requires approximately 20 watts of AC power and is housed in
an attractive brown and tan cabinet that matches the DS3100 ASR and
other HAL Communications Video Display Terminals. The cabinet can
be supplied for either table or relay-rack mounting.
A complete set of cables and connectors are furnished with the
5T-6000 ro simplify rhe initial instal Iation of the Sf-5000. lf you
are anxious to try your ST-5000, it is suggested that you skip to sections
3.1 and 3.2 of the instal lat ion chapte.r and then read sect ions 4.1 and
\.2 of the operation chapter before turning the equipment on. The balance
of this manual should then be studied before attempting any "custom"
connect ions.
la
!-_1

2, SpTctFICATIoNS
Demodulator Section:
lnput data: Ser ia I Data
Data rate: Up to ll0 baud
lnput lrrrpedance: 500 ohnrs, balanced and isolated f rom ground
I npu t frequenc i es:
"Low-tonerr set: Mark = 1275 Hz
Space = 1445 Hz (tZO Hz shift)
1700 Hz (\25 Hz shift)
2125 Hz (BSo Hz shift)
"H igh-tone'r set: Mark = 2125 Hz
2295 Hz (tZo Hz shift)
2550 Hz (\25 Hz shift)
2975 Hz (BSo Hz shift)
"Special" tone sets Audio frequencies between 1200 and 3000 Hz;
mark tone must be common to all shifts'
850 Hz- max imum recornmended sh if t.
lnput s ignal ampl itude: Full I imit ing (fm mode) for s ignal
Ievel s betvreen -50 dBm and +20 dBm
("pproximately I mV to 'l 0 V rms).
When lrAMrr mode (non-l imit ing) is used,
input signal should be in the range
-40 to +20 dBm (approx imarely l0 mV
to l0 V).
lnput Fi lter -3 dB Bandwidth: 850 Hz shift - lZ5O Hz
(all tonesets) \ZSHz shift- l75Hz
l7O Hz shift - 275 Hz
Discriminator filters -3 dB
Bandwidth (all rone sets): 850 Hz shift - lB0 Hz_
\25 Hz shi ft - 125 Hz
l7O Hz shift - 7A Hz
Low-pass f i I ter bandwidth: 82 Hz (min imum for I I0 baud)
Tone Keyer Sect ion:
I nput data:
Data rate:
lnput signals:
Serial Data
Up to ll0 baud
Can be external Iy connected for:
l. sensing of current Ioop
?. sens
3. sens
4. sens
ng of EIA-RS-232C signals
ng of MIL-STD-IBBC signals
ng of "drV'keyboard contacts
5. C'/-lD key
6. CMOS-compatible signal
mark = 0V
space = +12 V
Standard - sanre tones as derncdulator input
Special - any tones in the 1200 to 3000 Hz
frequency range, mark tone common to all
shifts. ln addition, a CW lD tone is
generated 100 Hz below the mark tone;
Ct^/ lD = l 17 5 Hz f or " lov;- tones", 2A25 Hz
for "high-tones".
0utput tones:
2-1

Output muting: Tone.keyer outPut can be turned off and
on via rear panel connection (tole ENABLE)
Tone accu racy: + 0.lZ
Tone ampl itude: -Adjustable from -40 dBm to 0 dBm
(approximately lo mv to l.o v)
Anrplitude variation: Less than + 0.5 dB at 0 dBm output
Output impedance: 500 ohms, balanced to ground
Distortion: Al I harmonics below the 9th are
attenuated greater than 40 dB
(Less than l.OZ total harmonic distortion) '
Control Sect ion:
Autostart response time: Switch selectable: Slow = 3.5 sec.
Fast = 1.5 sec.
Motor control delay time: 20 seconds nominal
Antispace time: Space condition greater than 250 ms
KQS delay: Turn-on: Space condition longer than 5 ms
or upon key down of CW I D key
Turn-off: Space condition longer than 500 ms
or Mark condition Ionger than
I to l0 sec. (adjustable) or
I sec. after CW I D key oPen i ng
KOS NPN switch transistor: Off: +25 volts Dc maximum
0n: 500 ma maximum
Tuning lndicator: X Y, l" diameter osci'l loscope displ"y;
rear panel connections for addi tional
osci I Ioscope.
Automat ic Thresho'ld Control : Performs DC level restorat ion to prov ide
(nrc )correct ion for bias d istort ion irr received
signals; can be disabled with front panel
swi tch.
Decision Threshold Hysteresis: Provides switching hysteresis to provide
(orn) correct ion of d i stort ion caused by mu I t i -
path propagat i on effects; can be d i sabl ed
r^;i th f ront panel 'swi tch.
Demodulator 0utputs:
Current Loop: Two independent 250 volt, 100 ma NPN
switching transistors that may be connected
to the internal 175 volt, 50 ma looP
power supply or to external supPlies.
EIS - RS-232C compatible: Mark = -12 VDC
Space = +12 VDC
t4lL-STD-IS8CCompatible: Mark=+6VDC
Space = - 6 VDC
CM0S compatible:
(4oob series, +12 supply): Pre-autostart data: Mark = I 1x, +l .S VDC
Space + +8.4 to 12.0 VDC
Post-autostart data: Mark + +0 to 3,6 VDC
Space = +8.4 to I2.0 VDC
2-2

Miscel laneous Data:
Fuse prc>te.cLion: l'1ain AC Por;cr - 0.5 arllli, slovr-bl<lw
Loolr Por,ver SuPPIY - 0.1 arnP.
Acces>ablt f rotlt rcar Panel
Pov;er rcquirenrertts: 105 to 125 or 210 to 250 VAC
5C or 60 Hz
20 Watts rl)axinluttt (e^cluCinq printe'r motor)
Cabinet size : Width 17" U+l .Z crn) - lable
19" (l{8.3 cni) - rack
Height: 3.5" (B.g cm)
Depth: g" (ZZ.B crn)
Cabinet finish: Light tan front and rear panels
Textu red b rown top , bot tom, and s i de pane'l s
Baked vi nyl pai nt to match HAL vi deo termi nal s
we isht: 12.0 I bs (5.\5 kg) net
I5.o lbs (6.82 kg) shiPPins
Front Panel Controls:
SH I FT (ff Z1 (t hree swt iches ) : Se lect 170 Hz, tt25 Hz, or BIO Hz sh i f t ;
controls both the demodulator and tone keyer
sections'
LIMITER 0N-0FF: Allows the demodulator section to be
used in either limiting (FM) or non-
I im i t ing (AM) modes.
SENSE NORM-REV: NORM = rnark is lower tone
REV = mark is hiqher tone
Affects both the demodulator and tone keyer
sect i ons.
ATC 0N-0FF : Turns Automat i c Threshol d Cont rol on or off
DTH 0N-0FF: Turns Decision Threshold Hysteresis circuit
on or off .
PRINT LINE-L0CAL: LOCAL = demodulator signals are inhibited
to pernrit "local" oPeration.
KOS 0N-0FF: Turns. the keyboard operated swi tch sens i ng
crrcuit on or off
AUT0START FAST-SLOW: FAST = I .5 sec.* response t ime
SLOW = 3.5 sec. respoise time
AUT0START 0N-0FF: Turns the autostart c i rcu i t on or off
P0t^lER 0N-0FF: Turns AC power to the denrodu lator on or of f
0sci I loscope:
I NT:
FOC:
VER:
HOR:
Front Panel lnd icat()rs :
0scilloscope
Controls intensity of oscilloscope trace
Cont rol s focus of osc i I loscope t race
Vertical trace position control
Hor i zon ta I t race pos i t i on cont ro I
I nd i cates correct tun r ng wi th the standard
crossed-el I ipse patterns.
2-3

L00P: LED lamp that is on when Loop I is in
mark condition, regardless of autostart
or L INE-LoCAL condition.
SPACE: LED lamp that is on whenever post-
autostart data is in space condition.
|'1ARK: LED lamp that is on whenever pre-
autostart data is in mark condition,
K0S: LED lamp that is on whenever the KOS
circuit is'in transmit condition.
AUTo: LED lamp that is on whenever the
autostart circuit wi I I pass data,
P0WER: AC power-on ind icator.
Rear Panel Conn ec t ion s :
AC power input (unlabeled): Universal U.S. / European standard
connector for 120 / 2l+O UAC non-captive
AC power cords.
tlOToR: Three-prong AC socket to supply printer
motor power control led by the autostart
circuitry. The voltage avai lable is the
Ground (eround symbor), #F,n:; ;::,ffi-::"[::,::'i::",:;"tl'sr-6000'
and RF ground connect i on.
AC POWER .5A-SB: AC power fuse for ST-5000 only (not
for the l40T0R socket).
L00P .lA: Loop power supply fuse
L00P I E 2: l,,la in and auxil iary loop switch connections
lnternal loop power supply connection
CW- lD hand key connection
Sepa rate keyboard connect ion
L00P 3: Additional series loop connection that can
be used with loop I or loop 2.
KOS: KOS control I ine
Keyboard connect ion
RS-232 / MIL-IBB: Data input,/output connections for EIA -
RS-232C and HIL-ST0-188C connections,
CW lD hand kby congection.
SCOPE: Connection for external X-Y oscil loscope
d ispl ay
AUXILIARY C0NTRoL: l! pin connector to provide access to
many control and signal lines of the ST-5000,
A circuit-board jumper plug is furnished
to make lnorma l I jumpers.
AUDIO 0UTPUT: Balanced 500 ohm tone keyer output
AUDIO INPUT: Balanced 500 ohm demodulator tone input
NOTE: Al I of the above specifications are nominal, design-center values
and may vary in production units by as much as + l0 Z. HAL Communications
Corp. reserves the right to alter any specifications without prior
notification.
2-lt

3,
3.1
I rusrnLLAT r oN
lnitial lnspection
Upon receipt of the ST-5000, uopack and inspect it carefully for
shipping damage. lf evidence of shipping damage is found, contact the
carrier immediately. Before discarding the packing material, check that
all parts and accessories are accounted for. lf any are missing, please
notify the factory or distributor in writing so that replacements can be
suppl ied. The f ol lowing parts and accessor ies are f urn ished with the
ST-5000:
Accesory parts:
I - Non-capt i ve AC power cord
1 - l5 pin Auxil iary jumper plug (shipped in place on Auxiliary
connector)
3 pin Loop 3 jumper plug (shipped in place on Loop 3 connector)
Aud io lnput cable (phone to three pin male connector)
Audio 0utput cable (phone to three pin female connector)
Loop I cable (2-conductor cable to female 6 pin connector)
KOS cable (2-conductor cable to male 3 pin connector)
c|{ lD and RS-232c 0utput cable (2, 2-conductor cables to
6 pin male connector, mates with RS-232 / MIL-lBB connector)
12 ft 2-conductor shielded cable
2 - 6 pin female connector shel ls (03-09-2061)
2 5 pin male connector shells (Ol-09-1061)
4 3 pin female connector shel I s (Ol-Og-2031 )
6 - 3 pin male connector shel ls (03-09-1031)
2 -15 pin female connector shells (Ol-Og-Zl5Z)
60 male cable pins (Oz-og-2lt+3)
24 female cabte pins (OZ-Og-l 143)
2 - 0.5 ampere, slow-blow fuses
2 0. I ampere fuses
.r- ;k
zr - -l-
.t-
,r -t-
i: CAUT ION: A SER IOUS SHOCK HAZARD MAY EX tST WHEN CONNECT ING THE ;!
-t-
sr-5000 T0 OTHER EQU I PMENT. BEFoRE MAKTNG ANy coNN- :k
.t. -t-
-t-
,. ECT IONS, BE SURE TO D ISCONNECT THE 5T-6000 AND OTHER ;T
-i-
;t EOU IPMENT FROM THE AC POWER L INF. ;i
:k Lyvtr rrLrtt I t\vtl tttt_ nrJ I vwLl\ LllIL. -r-
-t-
,\ .1.
-t.
,r -t-
3-l

3.2 Use of Factory Suppl ied Cables
A total of five factory prepared cable-plug combinations and two
jumper-plugs are supplied with the ST-5000. These cables and plugs
can be used to make most standard input and output connections to the
ST-5000, particularly those connections in which an ST-5 or similar
denrodu lator is be ing repl aced by the 5T-6000. The use of these standard
cabl es and jumpers i s d i scussed i n the fol lowi ng sect ions. Fi gure 3. I
shows in pictorial form some of the possible connections to these standard
cables.
3.2.1 Aud io I nput Connect i on
The audio input cable supplied mates with the rear panel audio irrput
connector and has a phono pin plug on the other end for connection to the
station receiver. lf the receiver output does not have a phono connector,
the plug may be cut off of the cable and replaced with the proper type, or
a new cable can be prepared using the procedures described in section 3.3.
3.2.2 Aud io 0utput Connect ion
A factory-prepared cable is I ikewise provided for connection of the
tone keyer output of the 5T-6000 to the station transmitter. This cable
also has a phono plug connector which may be used or removed as the
particular connections dictate. The output level of the tone keyer is
adjustable with an internal control over the range of -40 dBm to 0 dBm. See
section 4.13 of the operations section for proper adjustment procedures. lf
a d if f erent aud io output cable is requ i red, see sect ion 3.3 for proper
preparat ion procedures.
3.2.3 Loop I Cable Connection
There are three ways in which current-loop operated devices may be
connected to the 5T-6000; "Loop 1", using the "Mainrrtrasistor keyer,
"Loop 2", using the t'Auxiliary'r transistor keyer, and rrloop 3", a jumper
connection in series with the internal 6O ma loop power supply. The
factory supplied cables and jumper plugs are arranged so that the internal
loop power supply, "Loop 3" jumper, and "Loop*l" main keying transistor
are ser ies connected. "Loop 2" is not connected wit'tr the standard cables
and plugs. Alternate applications of the loop connections are discussed
in section 3.3.1. Current-loop sensing devices such as teleprinters
and electronic displays and keyboards can be connected to the nominal
6O ma loop circuit using the cable labeled "Loop I". lf the device is
polarity sensitive (such as the DKB-2010 keyboard and the DS-3000 KSR
Terminal), the white wire is the "positive" connection and the black
the "negativer'. The shield of the cable is NOT connected in the loop
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LOOP
DS3IOO ASR
3 - 9lO6t
-9il43
3
2
r>
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r Kos I xos
J
SHELL: 323- 9t03t
PIN: 320- 2143O
sr6000
PINS: 32O - 21430
RS-232
AUDIO
OUTPUT
323 -9203t
?o -21430
SHELL: 32
PINS: 322
WHT
CONNECT TO EITHER CATHODE (+)
oR GR|D BLOCK (- ), DEPENDTNG
UPON TRANSMITTER REOUIREMENTS
2 cw-tD I
sGND )
SHELL:
PINS: 3
1 AF OUTI
2 GND I
3)
SHELL:
PINS: 3
I AF IN.)
2 GND I AUDTO
I IN PUT
3)
sHELL: 323-9l03l
PINS:322-91143
GND
( cArHoDE
I9-1s1 I u*,
OUTPUT I
IGRID BLOCK
SH ELL : 323 - 9lO3l
PINS: 322' 91143
323 -9t06t
22-91t43
r
MORSE I AF IN I
AUDIO L GND 4
SHELL:323- 92061
PINS: 320-21430
KEY GND PTT M IC
TRANSCE IVER
CABLE:
355-t3072
AUDIO
OUTPUT J
GND
3-3b

Note: The data connection
connection, not an
5T6000 is only used
between the DS3100 and the 5T6000 'i s via a loop
RS232 connection. The "RS232" connector on the
to connect the C[.l ID line to the demodulator.
DSstOO ASR
MICROPHONE
CONN.
VIDEO CABLE
J6--.
*orr, @
f6"r
*o"..4,
(
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AUX JUHPER
PLUG REOUIRE
a) LooP
\-/ laz
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I KEY ir?l?,
GND GRID BLOCK KEYED
TRANSMITTER
=--:-- -
'*1,___J
sT6000
$ffi-4
HF TRANSCEIVER
3-3c

sr 6 000
DSzOOO KSR
r+lLooP
: ;,J taz
SHELL: 323-92061
PINS: 32O -21430
, *orl
J Kos
SHELL: 323 -9l03l
PIN:322-91t43
z cw-ro )
; u*, ) RS-232
SHELL:323-91061
PINS : 322-91143
r AF our'l
2 GND I AUDTO
_ I OUTPUT
5) SHELL:323-92O31
PINS: 32O -21430
r ar rrul
2 GND I AUDTO
I lrupur
5J
sHELL: 323- 91031
Pl N S: 322-91143
GND
lN lr
ND 2.
SHEL
PINS
[^:
+l
2
+3
4
GND 5
KoS 6
CATHODE 7
GND 8
GRID BLOCK 9
t/o
SHELL : 323 -91091
PINS:322-91t43
323-92031
32 0 - 2t430
MORSE
AUDIO
/on \
\rr,n z ooo)
GND
CABLE:
355-f 3072
PLUG:
3to -ooolo
WHT
GI{D PTT MIC
GND KEY AUDI O
OUT PUT
TRANSCEIVER
052000 and 5T6000 System Connection Schematic
coNNEcr ro cATHooe (-)
oR GRro aLocr (-) DEPENDTNG wHT
UPON TRANSMITTER REQUIREMENTS
3-3d
Figure 9a

circuit but is connected to the ST-500 cabinet. The shield wire
should therefore be connected to the cabinet of the teieprinter or
electronic device as a safety ground. A typical connection to a 60 ma.
teleprinter is shown in Figure 3. I. Notice that the selector magnets
and keyboard contacts of the machine are series connected. Also,
since the standard cables and jumpers connect the 5T-6000 internal
loop supply, an external loop power supply should t'!0T be included in
the loop circuit. Additional TTY equipment can be connected in the loop
by breaking the jumper on the L00P 3 plug and series connecting the
devices. 0n the L00P 3 plug, pin I is positive, Pin 3 is negative, and
pin 2 cabinet ground. 0ther loop connections possible with the standard
cables are shown in Figure 3.2. Alternate loop connect ions are d iscussed
i n sect ion 3.3. I .
3 .2 .\ Motor Power Connect ion
The power for the teleprinter motor can be supplied by the M0T0R
connector of the ST-5000. The power to this connector is controlled
by the autostart relay of the sT-5000. The ToTAL current suppl ied
by this receptacle should not exceed I0.0 amperes. The following
precautions should be observed when using the M0T0R receptacle:
l. The power to the M0T0R receptacle is NOT fused in the 5T-6000.
The user should be sure that any device attached to this
connector has its own fuse protection.
2. The AC voltage furnished on the M0T0R receptacle is the SAME
as the AC power line voltage supplied to the ST-5000; if
the ST-5000 is operated from a nominal 2\0 VAC power line,
the l'40T0R receptacle also furnishes 2\0 VAC.
3 .2.5 KOS Cab l e Connect ion
The wires from the KOS cable can be connected to the transmitter
push-to-tal k (PTT) control I ine for automatic transmit-receive control
of the stat ion. The jumpers on the factory-suppl ied AUX I LIARY jumper
plug allow operation of the KOS circuit when the keyboard and printer
sections of the teleprinter are series connected to L00P I (or L00P 3).
A complete discussion of the operation of the KOS-circuit is found in
section 4.9. Alternate KOS circuit connections are alse discussed in
a later section. The following precautions should be observed whe,n
us i ng the KOS cabl e:
l. The KOS switching transistor in the 5T-6000 is an NPN transistor.
The transmitter push-to-talk (PTT) line should have a positive
voltage with respect to ground in receive condition.
2. Shunting the PTT line to ground should place the station in
transmi t mode.
3. The voltage of the PTT circuit should not exceed +25 volts (receive).
4. The current drawn through the KOS transistor in transmit mode
should not exceed 500 ma.
5. lf negat ive or AC voltages are to be control led by the KOS
circuit, a DC relay shouId be used to isol:te the K0S and PTT
circuits.
6. The KOS connect ion is to the wh ite wi re (*) and the sh ield wi re (ground ) .
3- t+