Hal Communications RS2100 User manual
..
~
~
'--
~
..
,...._ '
·,
~
~.
;
R S 2 1 0 0
R T T Y S C 0 P E
INSTRUCTION
MANUAL
HAL COMMUNICATIONS CORP.
BOX
365
URBANA, ILLINOIS
61801
QUALITY COMMUNICATIONS EQUIPMENT
f
(
(
·.'
R S 2 1 0 0
R T T Y S C 0 P E
Copyright
~
1982 by
HAL
Communications
Corp.,
Urbana,
Illinois.
Printed
in
the
United
States
of
America.
All
rights
reserved.
Contents
of
this
publication
may
not
be
reproduced
in
any form
without
the
written
permission
of
the
copyright
owner.
July,
1982
Printing
RS2100
RTTY
SCOPE
CONTENTS:
INTRODUCTION
• • • • • •
CHAPTER
1.
UNPACKING
AND
INSPECTION
2
CHAPTER
2.
RECEIVING
WITH
THE
RS2100
. . . . . . . .
2.
1
How
it
Works • . . . . . . . . . . . .
2.2
Connecting
the
RS2100
Tuning Scope
2.3
Receiving
RTTY
Signals
. . . . . . .
2.4
Connecting
the
RS2100
Loop
Supply • .
CHAPTER
3.
IN
CASE
OF
DIFFICULTY
• • • • • $ • . . .
3.
1 Care and Feeding
of
Your
RS2100
•••
3.2
Typical
Operational
Problems . . . .
3.3
Repair
Procedures
. • • • • • • • • .
3.4
User Adjustments . . . . . . . . . .
CHAPTER
4.
SPECIFICATIONS
• • . . . . . . . . . . . .
LIMITED
WARRANTY
• • • • • . • . • • • . .
• • . . .
. . . .
. . .
. . . . .
.
. .
.
4
4
5
6
8
. • • • • • 10
. . • • • •
10
. . . • • .
11
. . . . . •
12
. . . • • • 16
. . . . . •
18
. . . .
•.
20
ILLUSTRATIONS:
Figure
1.
Figure
2.
Figure
3.
Figure
4.
The
RS21
00
• • • • • • • . . . . • . . • . • . • • • 1
RS2100
Connections
• • • . • . . . • . • . • . . • • • 3
RS2100
Schematic
Diagram
•.•.•••••••••••
14
Test
Points
and
User-adjustable
Controls
.....••
15
'"''·
,
~)
~
c
.,
(
(
RS2100
USER
MANUAL
INTRODUCTION
v
"f
~
This
manual
describes
the
installation
and
operation
of
the
HAL
RS2100
RTTY
Scope.
The
features
of
th~
RS210Q
have
been
designed
for
conven-
ient
and
straightforward
us'e,;
~many
features
are
self-explanatory
from
a
close
examination
of
th'E{'RS2100
front
panel
or
rear
panel.
However,
like
many
sophisticated
electronic
devices,
there
are
some
features
and
operator
techniques
which you
may
not
understand
until
you
have
read
this
manual.
You
should
plan
to
devote
several
hours
to
becoming
familiar
with
your RS2100.
Figure
1 The
RS2100
PAGE
2
CHAPTER
1
UNPACKING
AND
INSPECTION
When
you unpack
your
RS2100
carefully
inspect
the
shipping
carton
and
the
cabinet
for
shipping
damage.
Any
evidence
of
shipping
damage
should
be
immediately
reported
to
your
supplying
dealer
or
shipping
carrier.
Be
sure
to
save
all
packing
materials
if
damage
is
found -
the
shipping
carrier
will
want
to
inspect
them
for
any
insurance
claim.
Before
discarding
the
packing
materials
check
that
all
parts
and
accessories
are
accounted
for.
Check
the
accessories
against
the
following
list.
If
any
are
found
missing,
double-check
the
packing
for
loose
parts
and
then
notify
either
your
dealer
or
HAL
Communica-
tions
Corp.
of
the
shortage.
Please
specify
the
HAL
part
number!
Accessory
parts:
Accessories
Packed With RS2100:
3 -
310-35012
1 -
310-00010
2 -
310-00020
1 - 770-05001
1 -
333-17250
355-132'{2
355-14000
870-02105
Phono
Pin
Plug
Monaural Phone
Plug
Stereo
Phone
Plug
0.5
Ampere
slow-blo
fuse
Power Cord
Stereo
Phono Cable
Phono
to
Phone
Plug
Cable
RS2100
USER
MANUAL
:,
r~
:I"'
'Tj
1-'·
OQ
c
..,
(1)
1\.)
::0
Ul
1\.)
-"
0
0
0
0
::3
::3
(1)
()
cT
1-'·
0
::3
Ul
A
-
8
-
c
-
D
-
E
l 1
[~·~
0
..
10
Sl"l"n:·.,,.,
~
..
Gf!OUNO
1 I
2 I
:s
I 4 I I!
C.ltiOO
0 D
oo
..
,.
r•to",
'"'
'"'UI
~··
000000000000000
I
t~
LJ-,
IJOTES:
i.
c.C)
....
•~:.t
C.T2100
...
Tre
..
n••..,..,
•s
,.
...
t.T2too
t..A-.ua\
'2.
C.o.,.ru.t
1o
DS10SD
••
.w...,...
•"o,.c.
3.CWJt48S'
CWit,SSO
c..
..
~•t''.SWOOf-F!!tK"+o"LOOPt"fttL"
-4.
n.
NOT
v.•
FtS2IOOl
•
.,,,.,.,.,,,
....
""'
tull'n0
1
e.o..>~tuoo,srsooo,sT&.
1
STS
5.
A4d:+••l
TTY
Mk
\""•)'
t..t.
........c.hcl
~
~TTY2.•'
2 I 3 I 4 I II
I 6 I 1 I 8
o
....
D
0·""
)'f"
•
OT'
r
......
ltQ-<-
~
~~
o·'"'f!,
0'".,
't,.JIIll.o
""'-
~
~1\.
"'
.,
..
,_
--·-·-
----1
L
......
,
···rJI
. M,ta
TTY
M/C
l:iii:iL--
--
to.••
tc:.y~mo
....
~
mu
HAL
CDMMUNICATIDNa
CD
..
P.
90)( 3650 URBANA,
llLINOIS
61801
ftGVRE.
2.
RSZIOO
CoNNECTIONS
DATE
28
:TUtJE
81
SCALE
NONE
DRN
BY
Gt.>H
No.C
1052
APP
BY
<;,wll
I 6 I 1 I 8
A
-
8
--
c
-
D
E
-~
'"0
:x:-
Cl
tr1
w
PAGE
4
CHAPTER
2
RECEIVING
WITH
THE
RS2100
2.1
How
it
Works
The RS2100
is
an
accessory
for
the
CT2100
Communications
Terminal
that
provides
an
RTTY
oscilloscope
tuning
indicator
and a
high
voltage
RTTY
loop
power
supply.
The RS2100
cabinet
matches
that
of
the
CT2100
and
is
approximately
one-half
the
width
of
the
CT2100. However,
the
RS2100
may
also
be
used
with
a
great
variety
of
other
models
of
RTTY
equipment,
including
the
HAL
DS2050,
CWR685,
CWR6850,
CWR670,
CWR6700,
ST5000, ST6K, ST5K, and most
other
brands
of
RTTY
demodulator-terminal
equipment
on which a
tuning
scope
output
is
provided.
The
RS2100
will
not
provide
tuning
indication
for
phase-lock
loop
types
of
demodula-
tors
or
other
circuits
that
do
not
provide
separate
filtered
outputs
for
mark and
space
channels.
The
tuning
indicator
section
of
the
RS2100
uses
a 1
inch
diameter
CRT
(Cathode
Ray
Tube)
to
present
the
"standard"
crossed-ellipse
type
of
tuning
indication.
The
CRT
circuit
has
separate
amplifier
stages
for
both
the
X
(horizontal)
axis
and
the
Y
(vertical)
axis
of
the
display.
The
standard
RTTY
connection
is
to
display
the
RTTY
mark
signal
on
the
X-axis
of
the
CRT
and
the
space
signal
on
the
Y-axis.
Controls
are
provided
so
that
the
Gain
of
both
the
X and Y
axis
amplifiers
may
be
adjusted
to
suit
your
particular
demodulator.
These
controls
are
mounted
along
the
top
edge
of
the
circuit
board
and
the
RS2100
top
cover
must be removed
for
their
adjustment.
As
shipped
from
the
fac-
tory,
these
controls
are
set
for
proper
display
when
the
RS2100
is
used
with
the
CT2100.
Four
front
panel
controls
are
provided
for
adjustment
of
the
CRT
trace
intensity
("I"),
focus
("F"),
vertical
position
("V"),
and
horizontal
position
("H").
These
four
controls
are
grouped
around
the
CRT
bezel.
These
adjustments
should
be
set
to
your
prefered
viewing
conditions.
An
astigmatism
adjustment
is
also
mounted on
the
internal
circuit
board.
This
control
is
set
at
the
factory
and
should
only
need
re-adjustment
if
the
CRT
itself
is
changed.
The RS2100
also
includes
a
high-voltage
loop
power
supply
that
allows
the
CT2100
and
DS2050
to
key
the
selector
magnets
of
an
RTTY
machine
(Models
14, 15, 19,
and
28
in
particular).
This
supply
has
an
open-loop
voltage
of
200
VDC
and
the
mark
current
is
set
to
approxi-
mately
60
rnA.
The
loop
supply
may
be keyed
directly
from a
high
vol-
tage
switch
in
the
terminal,
such
as
is
found
the
the
CT2100
and
DS2050,
or
through
an
optical
isolator
circuit
from low
voltage
''··
1
·>··.·
,.
',~
.
,.
'4
(
l
(
CHAPTER
2
PAGE
5
transistor
switches
as
are
used
in
the
CWR685,
CWR6850,
CWR670,
and
CWR6700,
and
various
models made by
other
manufacturers.
Special
circuitry
in
the
CT2100
and DS2050
allow
transmitting
of
RTTY
from
loop
connected
devices
(keyboard
or
tape
transmitter)
when
the
high
voltage
connection
is
used.
The
optically
isolated
connection
may
only
be
used
to
drive
a
printer
when
receiving.
Two
front
panel
lamps,
labeled
"LOOP-MIS",
indicate
the
state
of
the
loop
signal.
These
lamps
ONLY
indicate
the
loop
status
and
DO
NOT
necessarily
show
the
same
state
as
that
indicated
on
the
CRT
screen.
Two
isolated,
"stereo-type"
of
phone
jacks
are
provided
on
the
rear
panel
for
con-
nection
to
RTTY
machines.
The
internal
power
supply
of
the
RS2100
provides
+1- 500
VDC
for
the
CRT
circuitry,
+24
VDC
for
the
CRT
amplifiers,
and +200
VDC
@60
rna
for
the
loop
circuit.
The
power
transformer
may
be
connected
for
ei-
ther
110-130
or
220-260
VAC,
50
or
60Hz.
A
0.5
Ampere
slo-blo
fuse
protects
the
entire
unit.
2.2
Connecting
the
RS2100
Tuning
Scope
Please
refer
to
Figure
2.,
"RS2100
Connections",
when
connecting
the
RS2100
to
your
RTTY
equipment.
A
"stereo-type"
of
twin
phono
connec-
tion
cable
is
provided
for
connection
of
the
RS2100
to
your
demodula-
tor.
Use
this
cable
to
connect
the
"MARK"
and
"SPACE"
scope
connec-
tions
of
the
CT2100
to
the
RS2100.
This
cable
should
also
work
di-
rectly
with
the
DS2050,
CWR685,
CWR6850,
CWR670,
and
CWR6700.
The
de-
modulator
end
of
the
cable
will
have
to
be
modified
when
the
ST5000,
ST6K,
or
ST5K
are
used;
just
cut-off
this
end
of
the
cable
and
in-
stall
the
Molex
pins
and
shell
as
described
in
the
demodulator
in-
struction
manual. Connect a
ground
wire
between
the
RS2100,
CT2100
(or
other
demodulator),
transceiver,
and any
RTTY
machine
cabinets.
Also,
connect
the
RS2100
power
cord
to
a
grounding
type
of
AC
power
outlet.
Connection
of
the
loop
supply
will
be
discussed
in
section
2.4
of
this
manual.
The
internal
X and Y
axis
amplifiers
of
the
RS2100
are
set
at
the
fac-
tory
for
the
correct
gains
for
use
with
the
CT2100.
Other
terminals
may
require
additional
adjustment.
The
DS2050
and ST5000
should
oper-
ate
with
similar
gain
settings
to
those
set
for
the
CT2100. The
gain
controls
will
probably
require
re-adjustment
(increased
gain)
when
other
models
are
used.
The
gain
control
potentiometers
are
mounted on
the
left
end
of
the
RS2100
circuit
board
(viewed
from
the
front
panel)
and
the
RS2100
cabinet
top
will
have
to
be
removed
to
make
the
adjust-
ments (remove
top
three
screws
on
each
side).
These
controls
are
most
easily
set
when
RTTY
stations
are
received
as
will
be
discussed
in
the
following
section.
CHAPTER
2
*****************************************************
* *
*
*
*
*
*
*
*
C A U T I 0 N ! !
Potentially
lethal
voltages
are
exposed
when
the
top
cover
is
removed from
the
RS2100. Use
extreme
care
when
the
RS2100
is
operated
with
the
top
cover
removed.
Use
of
an
insulated
alignment
screw
driver
is
highly
recommended!
*
*
*
*
*
*
*
*****************************************************
2.3
Receiving
RTTY
Signals
PAGE
6
Turn on
the
ac
power
to
the
RS2100 and
the
CT2100
(or
other
RTTY
demo-
dulator).
Tune
the
receiver
to
a
RTTY
station
and
adjust
the
CRT
in-
tensity
and
focus
controls
to
obtain
a
viewable
trace.
These
controls
will
interact,
so
a
"two-handed"
adjustment
procedure
is
recommended.
Do
not
try
to
set
too
high
a
trace
intensity
as
this
causes
severe
de-
focusing!
Position
the
traces
to
the
center
of
the
CRT
screen.
For
the
CT2100, DS2050, and ST5000,
these
should
be
the
only
adjustments
you need
to
make.
For
other
models,
you
may
now
have
to
adjust
the
X and Y
axis
gain
controls
to
obtain
sufficient
CRT
trace
deflection.
As
noted
in
the
previous
section,
these
adjustments
are
located
inside
the
RS2100
on
the
circuit
board
and
the
top
cover
must be removed
for
access
to
the
controls.
Be
sure
to
use
the
insulated
alignment
tool
and
avoid
con-
tacting
any
part
of
the
RS2100
interior
as
POTENTIALLY
LETHAL
voltages
are
exposed
when
the
cover
is
removed.
Adjust
the
two
left-hand
po-
tentiometers
(viewed
from
front)
for
an
approximate
2/3
width
screen
deflection
in
both
X and Y
directions
(left
pot
= Y
axis,
center
pot
=
X
axis).
Do
NOT
attempt
to
set
the
gain
for
full,
edge-to-edge
CRT
deflection
as
severe
trace
distortion
will
occur.
The
traces
may
be
most
easily
adjusted
when a
850
Hz
shift
RTTY
signal
is
received.
Conversely,
the
receiver
may
be tuned
to
a
constant
carrier
such
as
the
crystal
calibrator
to
give
separate
mark and
space
conditions.
The
traces
displayed
will
NOT
be
crossed
lines
unless
very
narrow
bandwidth
mark and
space
filters
are
used
in
the
demodulator.
The
normal
display
with
all
HAL
models
will
be
the
crossed-ellipse
pat-
tern.
The
tuning
oscilloscope
output
of
most
demodulators
is
obtained
from
the
demodulator
discriminator
filters.
These
filters
are
pur-
posely
designed
for
a
fairly
wide bandwidth
to
assure
that
all
of
the
keying
sidebands
of
the
RTTY
signal
are
properly
detected
and
the
op-
timum
signal-to-noise
ratio
is
preserved.
The
wide
bandwidth
of
the
discriminator
filter
allows
some
of
the
space
signal
to
be
detected
in
"
..
. ,
,.
>~I
(
(
(
CHAPTER
2
PAGE
7
the
mark
filter
and
vice-versa.
For
example,
if
only
a mark
tone
is
received,
a
high-amplitude
signal
will
be
present
at
the
mark
discrim-
inator
filter.
However, a
small
amount
of
the
mark
tone
will
also
be
present
at
the
space
filter
because
of
its
wide
bandwidth.
Therefore,
a
signal
is
presented
to
both
the
X and Y
axis
of
the
RS2100
scope;
a
large
amplitude
signal
on
the
X-axis
and a
smaller
amplitude
signal
on
the
Y-axis.
What
you
see
on
the
CRT
is
therefore
an open
ellipse.
Correct
tuning
is
shown
by
a
maximum
CRT
deflection
on
the
MAJOR
axis
(X
for
mark
andY
for
space).
Since
the
bandwidth
of
the
discrimina-
tor
filters
depends upon
the
data
rate
(WPM
or
baud)
to
be
received,
the
ellipse
will
be narrow
for
wide
shifts
(850Hz) and wide
for
narrow
shifts
(170Hz). The wide
ellipses
obtained
with
170Hz
shift
in
par-
ticular
may
be
at
first
confusing,
but
are
easily
interpreted
with
some
practice.
This
wfde-ellipse
display
is
actually
an
advantage
in
that
a
degree
of
phase
information
is
also
shown by
the
CRT
and,
with
practice,
you can
determine
which
direction
the
receiver
dial
should
be
turned
to
obtain
correct
tuning.
If
you
prefer
the
crossed-line
type
of
display,
this
may
be
obtained
by
adding
separate
high-Q
filters
tuned
to
mark and
space
between
the
demodulator
and RS2100. However, be
careful
to
use
isolation
amplif-
iers
between
the
demodulator
and
the
filter
to
avoid
interaction
with
the
demodulator
discriminator
filters.
Also,
these
extra
filters
will
have
to
be
tuned
very
accurately
to
match
the
center
frequencies
of
the
demodulator
filters.
The RS2100
will
now
indicate
only
when a
good
frequency
match
is
obtained
with
respect
to
the
add-on
filters,
not
necessarily
the
same
frequencies
as
those
of
the
discriminator
filters.
Practice
tuning-in
various
RTTY
signals,
comparing
the
RS2100
scope
trace
to
the
tuning
bar
and
flashing
LEDs
of
the
CT2100
(or
meter
on
the
DS2050
and ST5000).
After
some
practice,
you
will
find
that
you
can
easily
set
your
receiver
to
within
5
or
10
Hz
of
the
other
station's
frequency
(170Hz
shift).
If
you
use
a
transceiver
that
tru~~y
transmits
and
receives
on
the
same
frequency
(correctly
al-
igned),
your
transmit
frequency
should
now
closely
match
that
of
the
other
station,
thus
eliminating
the
offset
frequency
error
common
with
transceiver
RTTY
stations
that
do
not
have an
accurate
tuning
indica-
tor
(so-called
"frequency
walking").
CHAPTER
2
PAGE
8
2.4
Connecting
the
RS2100 Loop
Supply
Again,
refer
to
Figure
2.,
"RS2100
Connections",
for
connection
of
the
RS2100
loop
circuit
to
your
RTTY
equipment.
The RS2100
includes
a
high
voltage
(200
VDC
open
circuit)
loop
power
supply
that
is
pread-
justed
for
a mark
(closed
circuit)
loop
current
of
approximately
60
ma.
This
loop
supply
is
identical
to
that
used
in
the
HAL
ST6000,
ST5000, ST6, and
ST5
demodulators
•.
'The
RS2100
loop
supply
is
designed
to
directly
drive
the
selector
magnets
of
the
popular
models
14, 15,
19,
and
28
teleprinter
machines.
The
RS2100
will
NOT
directly
drive
the
selector
magnets
of
the
newer models
32
and
33
machines
since
these
machines
use
a 500 ma, low
voltage
selector
magnet.
Some
of
the
model 32 and 33
machines
do
have
high
voltage
loop
compatible
selector
magnet
driver
circuits
that
may
be
used.
However,
the
model
32
and
33
machines
have
also
been
sold
with
RS232
and
TTL
data
I/0
interfaces
which
may
be damaged by
connection
to
the
RS2100's
high
voltage
loop
supply.
The owner
of
such
a machine
should
determine
the
compatibili-
ty
of
his
particular
machine
before
connecting
it
to
the
RS2100.
The
simplest
loop
connection
is
to
just
a
printer
such
as
the
model
15
or
28.
In
this
case,
connect
the
tip
and
ring
terminals
of
a
"stereo"
phone
plug
(furnished
with
RS2100
accessories)
to
the
two
terminals
of
the
machine's
selector
magnets.
DO
NOT
GROUND
either
of
these
wires
or
the
loop
keying
circuit
of
the
CT2100
and
RS2100
will
not
work.
This
connection
will
allow
you
to
print
received
RTTY
text
but
does
not
allow
transmitting
from
the
RTTY
machine's
keyboard
or
from a
tape
transmitter
in
the
loop
circuit.
Plug
the
"stereo"
phone
plug
into
the
"TTY1"
RS2100
rear
panel
connector.
The
"TTY1"
and
"TTY2"
connec-
tors
are
wired
so
that
EITHER
a
stereo
or
monaural
type
of
phone
plug
may
be
used;
the
"sleeve"
connection
to
these
jacks
is
NOT
grounded!
If
your
TTY
machine
has
a
standard
1/4"
phone
plug,
just
plug
it
into
either
"TTY1"
or
"TTY2".
NOTE:
Loop
connection
of
a
printer
to
the
CT2100
or
DS2050
with
the
RS2100
only
allows
you
to
print
a
RTTY
signal
whose code and
data
rate
("speed")
match
that
of
the
received
signal.
For
example,
a
60
wpm
model
15
can
only
be
used
to
print
RTTY
signals
that
are
using
the
Baudot code and
are
running
60
wpm
(the
usual
radio
am-
ateur
combination).
The
loop
connection
does
NOT
provide
any
code
or
speed
conversion
to
the
printer;
reception
of
an ASCII
station
or
a Baudot
station
operating
at
a
different
speed
will
not
give
correct
print-out
on
the
loop
printer.
The ASCII
printer
output
of
the
CT2100
does
give
the
code and
speed
conver-
sion
for
Baudot,
ASCII, and Morse code
signals.
It
may
also
be
desireable
to
use
the
transmit
features
of
a
TTY
ma-
chine.
This
is
easily
accomplished
by
just
connecting
the
transmit
contacts
of
the
machine
IN
SERIES
with
the
selector
magnets.
For
ex-
·~
)
.,£~
~/#
(
(
{
CHAPTER
2
PAGE
9
ample,
for
a model
15
or
28,
just
connect
the
keyboard
contacts
and
selector
magnets
in
series,
as
is
shown
in
Figure
2.
A
tape
transmitter
("TD")
may
also
be
connected
in
series
with
the
loop
cir-
cuit
to
allow
transmission
of
paper
RTTY
tapes.
If
the
TD
is
a
separ-
ate
unit
from
the
teleprinter,
the
TTY2
jack
may
be
used
for
its
con-
nection
as
is
shown
in
Figure
2.
If
you
are
using
a model
19
or
model
28
ASR
machine,
the
connection
of
the
TD
contacts
is
usually
made
through
the
table
or
cabinet
wiring
and
only
one
loop
connection
is
usually
required
for
the
system.
NOTE:
ONLY
the
CT2100
and
DS2050
have
the
internal
circuitry
necessary
to
sense
that
the
loop
circuit
has
been
keyed from an
external
device.
The
sensed
loop
signal
is
then
used
to
key
the
internal
transmit
tone
generator
of
the
CT2100
or
DS2050.
Other
"loop
output
circuits"
on
equipment
of
other
manufacturers
will
only
drive
a
receive
printer.
To
transmit
data
from a
loop-connected
device
with
the
CT2100, you must
use
the
"LOOP"
position
of
the
"NORM-LOOP"
switch
(button
out).
Be
sure
to
restore
the
switch
to
"NORM"
when
you have
completed
the
loop
transmission.
On
the
DS2050, engage
the
"LOCAL"
position
of
the
"LINE-LOCAL"
switch
(button
out)
while
transmitting
from
the
loop
circuit.
Again,
be
sure
to
restore
the
switch
to
the
"LINE"
position
when
ready
to
receive.
Connect
the
RS2100
"CT2100
EXT.
LOOP"
jack
to
the
CT2100
"EXT.
LOOP"
jack
with
the
phone
to
phone
plug
cable
provided.
NOTE:
BE
SURE
THAT
THE
RS2100
POWER
IS
TURNED
OFF
WHEN
CONNECTING
THIS
CABLE;
DO
NOT
DISCONNECT
THE
CABLE
FROM
THE
CT2100
WHEN
POWER
IS
APPLIED
TO
THE
RS2100 -
THERE
IS
200VDC
ACROSS
THE
PHONO
END
OF
THE
CABLE!
The
RS2100
loop
supply
may
also
be
used
with
terminals
that
do
not
have a
high
voltage
loop
keying
transistor
such
as
the
HAL
CWR685,
and
CWR6850
as
well
as
most
equipment
made by
other
manufacturers.
For
this
equipment,
use
the
"LOOP
CTRL"
inp,yt
(small
phone
connector
in
the
middle
of
the
rear
panel).
The
keying
transistor
in
the
driving
terminal
should
have
the
characteristic
that
it
is
open
circuit
for
mark
condition
and
closed
(transistor
"on")
for
the
space
condition.
Use
the
"TTL
I/O"
output
on
the
CWR685
or
CWR6850.
The
"LOOP
CTRL"
input
drives
an
optical
isolator
in
the
RS2100
loop
circuit;
the
key-
ing
transistor
in
the
terminal
need
not
be
capable
of
switching
of
a
high
voltage
or
current.
The machine
connections
to
the
loop
in
the
case
are
the
same
as
those
outlined
above.
Note,
however,
that
this
connection
may
ONLY
be used
to
print
received
signals.
Keyboards
or
tape
transmitters
in
the
loop
circuit
are
not
sensed
with
the
isolator
circuit
and
the
terminal's
transmit
tones
will
not
be
keyed
with
this
connection.
Do
not
use
the
RS2100
loop
supply
with
the
STSOOO,
ST6,
or
STS
as
these
units
already
include
a
built-in
loop
power
supply.
PAGE
10
CHAPTER
3
IN
CASE
OF
DIFFICULTY
This
section
of
your
user's
manual
will
discuss
in
general
terms
how
to
keep
your
RS2100
in
top
operating
condition
and
typical
operating
problems
you
might
encounter
(and
some
solutions).
3.1
Care
and
Feeding
of
Your
RS2100
Your RS2100
is
the
latest
of
many
generations
of
RTTY
equipment
sold
by
HAL
Communications.
In
every
way,
it
has
been
designed,
construct-
ed,
and
tested
to
assure
years
of
trouble-free
operation.
However,
there
are
a number
of
simple
procedures
that
you,
the
user,
can
follow
to
further
improve
the
reliability,
performance,
and
lifetime
of
the
terminal.
The
following
suggestions
are
offered
to
help
preserve
a
long
operating
life
for
your
RS2100.
Environment:
Electronic
equipment
is
very
susceptible
to
variations
in
temperature,
relative
humidity,
and
to
dust
and
dirt
accumulations.
The RS2100
will
operate
in
normal
room-temperature
environments
and
should
be
as
tolerant
of
temperature
extremes
as
you
are
while
operating
it.
However,
inadvertent
blockage
of
the
ventilating
holes
in
the
cabinet
will
cause
the
INTERNAL
temperature
of
the
unit
to
rise
considerably
above
the
ambient
room
temperature
and
may
in
fact
cause
circuit
fai-
lure.
Also,
accumulations
of
dust
or
dirt,
particularly
when accom-
panied
by
high
humidity
conditions,
can
also
cause
overheating
and
may
result
in
long-term
corrosion
of
the
internal
circuitry.
Therefore,
try
to
position
the
RS2100
so
that
its
ventilating
holes
are
not
ob-
structed
and
try
to
avoid
extremely
dusty
or
dirty
environments.
On
the
other
hand,
the
solid-state
components
in
the
RS2100
are
designed
to
operate
at
considerably
higher
temperatures
than
we
humans; do
not
be
overly
disturbed
if
the
cabinet
of
the
RS2100
operates
quite
warm
to
the
touch.
This
internal
heat
often
helps
to
"dry-out"
humidity
in
the
cabinet.
In
the
normal
course
of
operation,
the
face
of
the
CRT
may
attract
a
build-up
of
dust
or
smoke
"haze".
This
may
be
expected
even
in
the
cleanest
areas,
particularly
if
tobacco
smoking
is
prevalent.
Because
of
the
air
flow
around
the
CRT
and
the
high
voltage
applied
to
it,
dust
is
actually
attracted
to
the
CRT.
This
causes,
over
a
period
of
time,
what
may
appear
to
be
a
gradual
fading
of
the
screen
intensity
as
well
as
de-focusing
of
the
traces.
Therefore,
the
face
of
the
CRT
should
be
cleaned
often.
Electrical
Connection:
All
electrical
connection
points
of
the
RS2100
have
maximum
voltage
and
current
ratings
as
given
in
this
manual.
If
these
ratings
are
ex-
··~
)
'~
(
(
(
CHAPTER
3
PAGE
11
ceeded
for
even a
short
period
of
time,
considerable
damage
to
the
scope
may
result.
Therefore,
be
very
careful
--
KNOW
the
ratings
of
the
RS2100 and
the
characteristics
of
any
other
equipment
before
mak-
ing
connections.
Some
common
causes
of
electrical
failures
have
been
found
to
be:
A.
Inadequate
grounding,
causing
RF
interference
problems
as
well
as
sensitivity
to
AC
power
line
transients.
B.
Damage
from
lightning,
or
other
transients
on
the
power
line
or
station
antenna
system.
A good
lightning
protection
system
may
help,
as
will
disconnecting
the
antenna
and
ac
power
during
electrical
storms.
However,
such
things
are
unpredictable
and
the
RS2100
is
no more
susceptible
to
such
problems
than
other
elec-
tronic
equipment
in
the
station.
C.
Improper
connections
to
high
voltage
devices
or
to
equipment
with
inadequate
safety
grounds.
Be
sure
that
all
devices
plugged
into
the
AC
mains have
safety
grounds
attached
to
them.
AC
line
by-pass
capacitors
in
a
piece
of
equipment
may
cause
the
cabinet
of
that
equipment
to
"float"
at
an
AC
potential
sufficiently
high
that
damage
might
be done
to
the
RS2100 when
the
equipment
is
con-
nected.
CONNECT
THE
GROUNDS
FIRST -
THEN
CONNECT
TO
POWER!
3.2
Typical
Operational
Problems
Operation
of
the
RS2100
Should be
fairly
straightforward
and few
prob-
lems
should
be
expected.
However,
there
are
some
indications
that
may
at
first
be
confusing
to
the
first-time
user.
The most
common
of
these
are:
1.
CRT
trace
is
ovals,
not
lines:
As
explained
in
section
2.3
of
this
manual,
this
is
normal
since
the
discriminator
filters
of
most
demodulators
are
ne-
cessarily
wide
to
accomodate
the
keying
sidebands
of
the
RTTY
signal.
Additional
filters
may
be
added between
the
demodu-
lator
and
RS2100
to
give
sharp
line
traces,
but
this
is
NOT
recommended
since
the
RS2100
then
only
indicates
the
signal's
match
to
these
filters
rather
than
to
the
demodulator
filters
as
desired.
2.
CRT
trace
is
not
focused:
This
is
usually
caused
by
adjustment
of
too
high
an
intensity
control
setting.
Reduce
the
intensity
control
and
try
re-
focusing
the
trace.
In
extreme
cases,
the
astigmatisim
con-
trol
(mounted
on
the
circuit
board
-
see
section
3.4)
may
have
to
be
readjusted.
If
these
steps
fail,
check
the
CRT
high
voltages.
CHAPTER
3
3.
CRT
trace
distorts
at
the
This
is
usually
caused
by
gain.
See
section
2.3
controls.
If
this
fails,
defective.
ends:
setting
of
too
high
a X
or
and
3.4
to
readjust
these
the
amplifier
transistors
PAGE
12
Y
axis
internal
may
be
4.
CRT
trace
leaves
a
dot
on
the
screen
while
transmitting:
This
is
entirely
normal;
the
CRT
trace
is
NOT
blanked
during
transmission.
Our
experience
has
shown few
problems
with
"burning
a
hole"
in
the
CRT
screen
due
to
this
dot,
especial-
ly
if
the
CRT
intensity
is
set
to
a
fairly
low
level
as
is
recommended.
If
you
are
going
to
leave
the
station
unattend-
ed
for
a
period
of
time,
you
may
wish
to
turn
the
intensity
control
down.
5.
Mark and
Space
lights
don't
flash:
The mark and
space
lights
indicate
ONLY
the
loop
status;
they
do
not
indicate
the
same
conditions
as
the
CRT!
If
the
mark and
space
lights
are
not
flashing,
the
loop
circuit
is
probably
not
being
keyed
as
described
in
section
2.4
of
this
manual.
6.
Can't
transmit
RTTY
from
the
machine
keyboard:
As
discussed
in
section
2.4,
loop
data
can
only
be
transmit-
ted
when
the
HAL
CT2100
and
DS2050
terminals
are
used.
This
is
because
special
loop
sensing
circuits
are
built
into
these
models
that
may
NOT
be
included
in
other
pieces
of
equipment.
3.3
Repair
Procedures
In
the
event
that
your
RS2100
develops
a
malfunction,
the
first
step
is
to
carefully
note
all
of
the
symptoms
of
the
problem.
Statements
such
as
"BROKEN"
or
"DOESN'T
WORK"
are
of
little
help
to
the
service
technician,
and
usually
lead
to
longer
repair
times
than
might
other-
wise
be
required.
Try
to
provide
as
much
information
concerning
the
failure
as
you
can
before
you
contact
your
dealer.
By
all
means,
con-
sult
your
dealer
before
calling
the
factory;
he
may
be
able
to
fix
the
unit
locally
and
avoid
the
shipping
and
delay
times.
·~
:)
.
."
\fJ#
(
(
(,
CHAPTER
3
PAGE
13
The
following
are
some
factory:
of
the
things
that
will
concern
the
dealer
or
1.
Model number
2.
3.
4.
5.
6.
7.
8.
Serial
number
How
long
have you owned
it?
Where
did
you
purchase
it
(dealer's
name)?
If
purchased
used,
who
was
the
previous
owner?
refer
to
any
previous
repair
history
on
that
unit.)
(Used
to
What
operating
conditions
are
associated
with
the
failure?
Are
there
extenuating
circumstances?
(Lightning,
spilled
li-
quids,
dropped
unit?)
What
unit
are
you
using
the
RS2100
with
(CT2100, DS2050,
etc)?
9.
Is
there
anything
else
you
can
add
to
the
description
that
you
think
might
be
useful?
AFTER
you
have
determined
answers
to
the
above,
contact
your
dealer
and
discuss
the
problem
with
him.
If
he
indicates
that
he
will
be
un-
able
to
assist
you,
the
unit
should
be
returned
to
the
HAL
factory
for
repair.
Before
returning
the
unit
to
the
factory,
either
you
or
the
dealer
should
call
and
receive
factory
return
authorization
so
that
we
may
expect
the
unit
in
shipping
and be
prepared
to
work on
it
when
it
arrives.
Whenever
possible,
return
the
unit
via
UPS
to
the
factory
address
below,
insuring
it
for
the
full
value.
The
shipping
cost
to
the
factory
should
be
paid
by you;
the
return
shipping
costs
from
the
factory
(48
contiguous
states
only)
are
paid
by
HAL
(warranty
repairs
only).
The
factory
"ship-to"
address
is:
HAL
COMMUNICATIONS
CORP
1201
W.
KENYON
ROAD
BOX
365
URBANA,
ILLINOIS 61801
ATTENTION:
REPAIR
DEPARTMENT
The
one-year
limited
warranty
(listed
in
full
at
the
end
of
this
manu-
al)
provides
for
repair
of
the
RS2100
for
a
full
year
after
purchase.
The
purchase
invoice
date
from
your
dealer
marks
the
beginning
of
the
warranty
period
-
save
your copy
of
the
invoice!
Please
read
the
war-
ranty
carefully
to
determine
the
full
extent
of
the
privileges
and
limitations.
::0
(/l
1\)
0
0
(/)
(.)
::;
CJ)
9
Ill
cT
.....
(.)
Cl
.....
Ill
()Q
-s
Ill
9
A
c
0
E
2
t.rol'co'.L
I
flo~~
1-----,
''•"'
co~--
-&----"v--
--
-----------'--------1
llfoo3!'1S
_(
T
IK
2
....
Hf'<::.UtO
4
!l 6
f?,."B:
18-llliiiE-SZ
'Y.£~
1\
lf>-~'Ai-82.
!I
6
1 8
'*
(mJNE>l._l
1-Z.
r-oe_
b'Mt~\\
c._~,
(_£t-H~nc-r
1:
\
Foil!_
\)!\\3-:.
<::~
ctJ/or~
,,.__
5~
Co>IPIEcnoN
o~
--
IIO::ffJA.C
:;;'{
L.
~-
1-
':.'::.r
hoV
n r
I
-0----
~
o-,
'2>o-<sov.4t:.
~~
C..c.>JNF-C14CIIJ
.
--0-----
mu
HAL
CDMMUNICATIDN8
CORP.
m 80)(
365~
URBANA~
IlliNOIS
e!&Oft
RS-2100 RITY SCOPE
fiGUI<_E_ 3.
DATE
o8-
HAY-
tl
Z.
ORN
BY
T-1--.--
APP
BY
7
SCALE
No.Al437B
e
A
B
c
0
E
,.....
,...,,,
~
(")
::t:
~
'"'0
2 I 3 I 4 I !! I 6 ! 7 I >-i
8 I tr1
:xl
w
.I
'TJ
.....
L
()Q
t::
-s
i1)
.f=
.
>-i
i1)
{ll
-~,
r-t500'i
CRT
l-tV
("1"
8
'"'0
r
,:
~::::
~.:.~D-CKT)
0
X..A.XIS
Q•IN
I B
1-'·
u'"\
-w\
I e d
::3
("1"
-
{ll
_...,-'WI>
Ol
::3
0.
cI
c: I
t1
I
~
II
u<v
•v
.J
..
{ll
\_
...
LOOP
·-PI
i1)
(.toof'
.,,.N-C.111.T)
I c
RSZioO
CIRCUIT
801'1tl>
(
""""sc
"•oM
"~o:Wt
~
...
,.~)
-s
I
Ol
__,
I I I I
II
'-
-lOOP
M'#
0.
c......
t::
{ll
("1"
Dl
Ol
~
~
t:T
L.J
......
I D
TOP
\I
leW
i1)
(")
0
::3
("1"
00
HAL
COMMUNICATIDN8
CORIO,
BOX
36!l
0 URBANA,
IlliNOIS
aJBOI
-s
0
......
t
{ll
FtGI!flE4.
o.djusto.ble
Controls
IE
DATE
:28- :nJNe:-az
TscALE
No>Jf!
OliN
bY
GWI~
TNo.
C
1053
2 I 3 I I APP
llY
""'~
I
'"'0
4 !! I I
6 1 l l
~
8
Cl
tr1
_...
Vl
CHAPTER
3
PAGE
16
3.4
User
Adjustments
Refer
to
the
Figures
3 and 4
for
the
RS2100
schematic
diagram
and
ad-
justment
and
test
point
locations.
*******************************************************
* *
*
*
*
*
*
*
*
*
*
*
*
*
*
C A U T I 0 N ! !
Potentially
lethal
voltages
are
exposed when
the
protective
covers
are
removed from
the
RS2100.
Be
extremely
careful
when
making any
adjustments
or
tests
to
avoid
touching
any
connections
on
the
circuit
board
or
RS2100
components.
Use
insulated
alignment
tools
for
adjustments
and
well
insulated
test
probes
for
all
measurements.
Be
sure
to
disconnect
the
AC
power whenever you
are
removing
the
covers
or
changing
components
in
the
RS2100.
*
*
*
*
*
*
*
*
*
*
*
*
*
*******************************************************
There
are
three
internal
user
adjustments
available
on
the
RS2100;
X-axis
amplifier
gain,
Y-axis
amplifier
gain,
and
astigmatisim
correc-
tion.
The
adjustmemnt
of
the
X and
Y-axis
gain
controls
was
discussed
in
section
2.3
of
this
manual.
The
astigmatism
control
should
be
ad-
justed
in
conjunction
with
the
focus
(F)
front
panel
control
to
give
the
most
consistent
trace
focusing
over
the
screen
area.
This
is
most
easily
accomplished
while
receiving
a
RTTY
signal.
The
focus
and
as-
tigmatism
control
interact
and
some
back-and-forth
adjustment
of
each
will
be
nescessary.
Be
sure
to
keep
the
trace
intensity
fairly
low
during
this
adjustment.
The
astigmatism
control
is
set
at
the
factory
and
should
not
require
readjustment
unless
the
CRT
itself
is
replaced.
As
noted
in
Figures
3 and
4,
there
are
four
different
power
suplies
in
the
RS2100.
If
power
supply
problems
are
suspected,
these
voltages
may
be
checked
at
the
points
shown
in
Figure
4
with
a
20,000
ohms-per-volt
VOM
or
higher
impedance
voltmeter.
The
voltages
should
measure
as
follows:
+500V
CRT
HV:
+525VDC
+1-
10%
-500V
CRT
HV:
-525VDC
+1-
10%
+24V
LV:
+24VDC
+1-
5%
+LOOP
HV:
+200VDC
+1-
10%
(LOOP
OPEN
-"SPACE")
-LOOP
HV:
+180VDC
+1-
10%
(LOOP
SHORT
-
"MARK")
If
any
of
these
voltages
are
not
within
the
above
tolerances,
a
defec-
tive
filter
capacitor
or
rectifier
diode
should
be
suspected.
If
all
of
the
voltages
are
wrong,
the
line
voltage
may
be low
or
high
or
the
selector
taps
on
the
power
transformer
primary
may
set
for
the
wrong
voltage.
Unless
otherwise
specified,
RS2100's
sold
within
the
United
States
will
have
the
primary
taps
set
for
110-130
VAC
power
mains;
'~
/)
J
(
(
(
CHAPTER
3
PAGE
17
export
units
will
be
set
for
220-260
VAC
operation
and a
special
label
will
so
indicate
on
the
RS2100
rear
panel.
The
cathode
ray
tube
used
in
the
RS2100
is
a
long-lifetime
device
and
it
is
unlikely
that
it
will
fail
until
after
many
years
of
service.
When
CRT
replacement
is
required,
be
sure
to
disconnect
the
power and
then
gently
pry
the
CRT
out
of
the
tube
socket
with
a
small
blade
screw
driver.
The
CRT
can
then
be
pulled
out
through
the
front
bezel.
When
installing
the
new
CRT,
be
sure
that
the
tube
pins
are
all
stra-
ight
and
aligned
with
the
socket
holes.
The
"gap"
between
pins
1 and
13
is
near
the
top
of
the
socket.
Before
pressing
the
tube
into
the
socket,
make
sure
that
all
13
pins
are
correctly
positioned
with
res-
pect
to
the
socket
pins.
It
is
easiest
to
stand
the
RS2100
vertically
on
its
back
when
positioning
the
CRT
for
insertion.
Now,
gently
press
the
CRT
into
the
socket.
There
may
be some
variation
in
the
CRT
phy-
sical
length
between
tubes;
this
can
be
compensated
for
by
the
amount
of
insertion
into
the
socket.
These
are
the
ONLY
user
adjustments
and
tests
on
the
RS2100.
If
you
are
unable
to
correct
a
fault
after
making
these
tests,
the
unit
should
be
returned
to
HAL
Communications
Corp.
as
explained
in
sec-
tion
3.3
of
this
manual.
Table of contents
Other Hal Communications Computer Hardware manuals
