Moseley DRS-1A User manual
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TABLE
OF
CONTENTS
Page
I.
INTRODUCTION
1
II.
SPECIFICATIONS
6
III.
UNPACKING
8
I
V.
INST
ALLA
TIO
N 8
A.
General
Information
8
B.
Wir
e
less
Operation
for
FM
Broadcast
Transmitters
9
C.
Wirel
ess
Operation
for
TV
Transmitters
13
D.
Equipment
Location
14
E.
Studio-Transmitter
Interconnections
14
F.
Functional
Test
Procedure
18
G.
Metering
24
H.
Control
28
I .
Fail-Safe
Connections
32
J.
Miscellaneous
Connections
34
K.
Calibration
36
V .
OPERATION
37
A.
Telemetry
and
Control
System
37
B.
Fail-Safe
Indications
38
VI.
CIRCUIT
DESCRIPTION
39
A.
General
Description
39
B.
Control
Terminal
42
1.
Timing
42
2.
Transmitter
Logic
43
3.
Receiver
Log
ic
43
4.
Metering
Fail-Safe
44
S.
Front-Panel
Readout
45
6.
Pow
er
Supply
45
DRS-lA
-i
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TABLE
OF
CONTENTS
7.
Control
FSK
Modulator
8.
Telemetry
FSK
Demodulator
9.
Telemetry
Phase-Shift
Demodulator
C.
Remote
Terminal
1.
Timing
2.
Transmitter
Logic
3.
Receiver
Logic
4.
Local/
Remote
Se
l
ectors
5.
Channel-Change
Logic
6.
Fail-Safe
Logic
7.
Miscellaneous
Logic
8.
Power
Supply
9.
Telemetry
FSK
Modulator
1
O.
Control
FSK
Demodulator
11.
Telemetry
Phase-Shift
Modulator
D.
Selector
Unit
1.
Channel
Decoder/Drivers
2.
Metering
3.
Control
E.
Subcarrier
Generator
F.
Subcarrier
Demodulator
VII.
ADJUSTMENTS
A.
Control
FSK
Modulator
B.
Telemetry
FSK
Demodulator
C.
Telemetry
FSK
Modulator
D.
Control
FSK
Demodulator
E.
Telemetry
Phase-Shift
Demodulator
F.
Subcarrier
Generator
G.
Subcarrier
Demodulator
VIII.
TROUBLESHOOTING
DRS-lA
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APPENDIX
A -
DIGIT
AL
LOGIC
FUNDAMENTALS
1.
·
"AND"
Gate
2.
11
NAND
11
Gate
3.'
Latches
4.
Counters
5.
Parallel
and
Serial
Data
Representations
6.
Universal
Asynchronous
Receiver/Transmitter
7.
Timing
and
Clock
Logic
DRS-lA
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Page
68
68
68
70
72
73
74
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INSTRUCTION
MANUAL
MODEL
DRS-
IA
DI
GITAL
REMOTE
CONTROL
SYSTEM
I.
INTRODUCTION
The
Model
DRS
-
IA
Digita
l
Remote
Control
'
system
was
designed
to
r
emote
ly
control
TV,
FM,
and
AM
transmitters.
In
addition,
the
system
is
ideally
suited
for
use
in
industrial
or
other
applications
wherever
a
need
exists
for
remote
data
telemetry
sampling
and
contro
l.
A
total
of
30
metering
channels
and
30
bidirectional
(on/
off,
raise/lower,
etc.)
control
functions
are
provided
by
the
system
in
i
ncrements
of
ten
channels.
A
24-channel
status/alarm
sub-
system
is
included
as
an
option.
Full
FCC
-
required
meterin
g
and
control
fail
-
safe
functions
are
provided
for
controlling
TV
trans-
mitters.
For
automatic
recording
of
telemetry,
the
companion
Model
DLS-1
Digital
Logging
System
provides
the
capability
of
pr
inting
up
to
20
parameters.
Interconnection
between
the
studio
or
control
point
(Control
Ter-
minal)
and
transmitter
site
(Remote
Termina
l )
requires
only
a
si
ngle
full-time,
two-way,
voice-grade
wire
line
or
radio
link.
The
standard
DRS
-
lA
e
mploying
a
te
l
ephone
line
interconnection
i s
referred
to
as
the
Model
DRS-1AW
.
When
options
are
installed
to
enable
subcarrier
techniques
to
be
used,
it
is
referred
to
as
the
Model
DRS-
lAR.
Di
gi
tal
techniques
are
used
in
the
design
of
the
DRS
-
lA
.
This
e n
sures
accurate
transmitter-to-
studio
tel
emetry
tracking
and
allows
one-man
calibration
from
the
transmitter
or
remote
location.
E r
ror
checking
is
included
in
the
data
receivers
neous
te
l
emetry
readings
and
control
fun-ctions.
i n
dications
are
given
to
ensure
the
operator
that
fu
nctioning
properly.
to
prevent
erro-
Control
feedback
the
system
is
Ease
of
operation
has
been
a
prime
cons
i
dera
t
ion
in
the
de
s
ign
of
D
RS-
IA
(
Rev
.
7/75)
-1-
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----- -
C:HANN!L
INO!X
CARO
,01t
OPERATOR
ID!NTl,iCATION
01'
CHANN!LS
- -
CHANNEL
INDEX
- - - - - -
3 1
;2
-OUUT
L!O
R!AOOUT
SHOWS
MET!R
ING
SAMPL!
VALUE
OR
ECHO
CHANN£L
NUNl!R
READOUT
1999
RAIS(
LOWER
---- -
LIO
IS
ON
WHIN
AEMOT!
T!IUIINAL
IS
IN
LOCAL
MOO!
CONTROL
OVlltRIOE
@
CHANNEL
SELECT
DI
SPLAY
___
_ _
CMANN!L
!CHO
O!PRIESS
TO
TE'ST
ALL
LEO
S!GNENTS
IN
READOUT
TEST
□□
OEPR!SS
OEPA!IS
TO
TO
GAUS!
CAUS!
A
A
RAISE
L
OWE
R
COMM
AN
D.
COMMAND
.
LAMP
LIGHTS
LAM
P
LI
GHTS
WHEN
WHEN
COMMAND
CON
MANO
FEE
DB
AC
K
FEEDBACK
IS
IS
RECE
IVE
D.
RtCEI
V
EO
.
0
a•
·
SELECT
CONTltOL
/
M(TEAIIUI
CHANN!L
NUMl!R
OEPR!SS
TO
Vl!W
ACTUAL
CONTROL
,HANNIL
NUMBER
IN
°
R!AOOUT
FIGURE
1-
CONTROL
TERMINAL
FRONT
PANEL
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CHANNEL
INDEX
CARO
,oR
OP!RATOR
IO!NTi,tGATION
o,
GHANN!LI
CHANNEL
INDEX
ANALOG
TO
DIGITAL
CONVERTll!:A
DISPLAY.
SHOWS
lfALUE
OF
METERING
SAMPLE.
(ILLUMINATED
ONLY
WHEN
IN
LOCAL
MODI!)
-1999
GLOWS
GREEN
WHl!N
MAIN
♦
,voe
SUPPLY
IS
ON
~
~
CHANNEL
SELECT
LOCAL
CONTROL
□
DEPRESS
TO
PLACE
UNIT
IN
LOCAL
MOOE.
DEPRESS
AGAIN
TO
RE
MOVE
UNIT
FROM
LOCAL
MOO[
.
LAMP
LIGHTS
IN
LOCAL
MOOE
.
RAIS!
LOWER
□□
0
DEPRESS
TO
CAUSE
A
RAISE
CO"MMAND.
LAMP
LIGHTS
WHEN
COMMAND
FEEDBACK
IS
Rl!CE
IV[D.
DEPRESS
TO
'-.
Sl!L!CT
GONTIIOL/METElltN
I
CAUSE
A
LOWER
GHANN!L
NUMIER
COMMAND
.
LAMP
Ll<iHTS
WHEN
COMMAND
'EEO
-
IAGK
IS
•reEIVID.
FIGURE
2 -
REMOTE
TERMINAL
FRONT
PANEL
--- - - - - - - - - - - - -- -
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CALIBRATION
POT!NTIOM!T!"
IS
S!T
SU
CH
THAT
NU
MB!R
IN
RtMOT!
T[RMINAL
REAO!)UT
MATCHES
R!AO
I
NG
ON
Rf,-!IUNC!
N!T!R
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a
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0 0
7 8 9
10
CHANNEL
NUMBER
I
O!NT
IFI
CATION
STIUP
FOR
OPERATOR
OESGIIIPTION
OF
MET!RING
SAMPLE
.
FIGURE
3 -
SELECTOR
UNIT
FRONT
PANEL
-
www.SteamPoweredRadio.Com
IL
SPEC
I
FICATIONS
Type
Number
of
Telemetry
Channels
Te
l
emetry
I
nput
Telemetry
Accuracy
Telemetry
Update
Calibration
Controls
Control
Sys
t
em
Number
of
Channels
Control
Output
Ratings
Telephone
Line
Studio-Trans
-
mitter
Interconne
c
tion
(DRS-lAW)
Telephone
Line
Impedance
Telephone
Line
Levels
Contro
l
FSK
Freq
u
encies
Telemetry
FSK
F r
eq
u
encies
Allowable
Line
Loss
DRS-lA
Fully
digital
comma
nd
and
tel
emetry.
Ten
minimum,
expandab
l e
to
20
or
30,
se
l
ected
one
a t a
time.
±1
VDC
for
±1000
reading
on
dis-
play.
Full
100
%
over
range
cap
-
ability
(±1.
999
VDC
for
reading
of
±1999)
.
Each
input
isolated
and
floating
(up
to
350
VDC);
lOOI.ffi
input
impedance
.
0. 1%
of
full
scale
270
milliseconds
with
audib
le
tele-
metry;
1.
3
seconds
with
subau
dible
telemetry.
Multiturn
potentiometers
Ten
On/Raise
and
ten
Off/Lower
minimum,
expandable
to
20
or
30,
isolated.
120
VAC
or
VDC
,
50
watts
non-
inductive
maximum,
fused
at
one
ampere.
6000
0
dBm,
adjustab
le
2300
Hz
to
2500
Hz
1300
Hz
to
1500
Hz
30
dB
(with
O
dBm
send
l
eve
l)
-6-
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Radio
Link
Studio-Trans-
·
mitte
r
lnte
rconnection
(DRS-lAR)
Radio
Link
Impedances
Radio
Link
Levels
Contr
ol
Subcarrier
Frequencies
Subaudible
Telemetry
Frequencies
(Option)
Telemetry
Subcarrier
Frequencies
(Option)
Operating
Temperature
Range
Power
Requirements,
30-
Ch
annel
configuration
with
all
status
channels
activated.
Control
Terminal
Remote
Terminal
1
9-inch
Vertical
Rack
Space
Control
Terminal
Status
Panel-Control
Terminal
Remote
Terminal
Status
Panel-
Remote
Terminal
IO-channel
Selector
Unit
Do
mestic
Shipping
Weight
,
Basic
10-channel
system
20000
nominal
1. 5
volts
peak-to-peak,
adjustable
26
kHz
typical
£or
monaural
STL.
110
kHz
typical
for
composite
stereo
STL.
Occupies
region
to
45
Hz.
67
kHz
typica,l,
41
kHz
alternate
for
FM,
39
kHz
for
TV
.
0°C
to
70°C
120/140
VAC,
50-60
Hz,
30
watts
-
120/140
VAC,
50-60
Hz,
35
watts
8.89
cm
(3-1/2
inches)
4.45
cm
(1-3/4
inches)
8.89
cm
(3-1
/2
inches)
4.45
cm
(1-3/4
inches)
4.45
cm
(1-3/4
inches}
23.1
kg
(51
pounds)
DRS-l
A
-7-
www.SteamPoweredRadio.Com
III.
UNPACKING
The
DRS-
IA
units
should
be
carefully
unpacked
and
inspected
for
any
shipping
damage.
Keep
·
all
packing
material
in
case
a
claim
is
to
be
made
against
the
carrier
for
damages.
Any
damages
should
be
reported
immediately
to
the
delivery
carrier.
Remove
the
top
covers
from
all
units.
Due
to
normal
shipping
vibration,
some
plug-in
components
may
not
be
fully
seated.
Ver-
ify
that
all
integrated
circuits,
relays,
and
other
plug-in
components
are
properly
seated
in
their
respective
sockets
or
connectors,
IV.
INSTALLATION
A.
General
Information
IT
IS
HIGHLY
RECOMMENDED
THAT
NO
CONNECTIONS
BE
MADE
TO
THE
DRS-
lA
UNTIL
THE
BASIC
CONCEPTS
OF
HOW
THE
SYSTEM
OPERA
TES
ARE
UNDERSTOOD
BY
THE
INSTALLING
PER-
SONNEL
. T
hese
concepts,
as
well
as
installation
suggestions
and
comments,
are
explained
in
the
next
few
pages
of
this
manual.
Bear
in
mind
that
if
the
units
are
interconnected
with
a
telephone
line,
the
system
is
a
DRS-IA
W;
if
wireless
(subcarrier)
intercon-
nections
are
used,
the
system
is
a
DRS-
lAR.
The
subaudible
te-
lemetry
option
is
typically
available
only
for
the
DRS-
lAR
system
.
Connections
which
will
be
·
required
at
the
Control
Terminal
are
to
th
e
power
so
urce
and
either
the
telephone
lin
e
(for
the
DRS-lAW)
or
the
STL/
radio
eq
uipment
(for
the
DRS-
lAR).
If
a
Status
Subsystem
is
included,
the
us
e r
may
wish
to
make
connections
to
the
externa
l
drivers
for
additional
visual
or
aural
indications.
The
mete
ring
fail-safe
output
may
also
be
connected
to
an
external
warning
device.
At
the
Remote
Terminal,
.
required
connections
are
to
the
power
source
and
either
th
e
telephone
line
or
radio
equipment.
If
req~red
by
the
licensing
agency,
the
fail-
safe
outputs
must
also
be
con-
nect
ed
to
the
transmitter.
In
addition,
the
Selector
Units
must
be
connected
to
the
Remote
Terminal
with
the
cable
provided.
Option
-
ally
,
the
Status
Panel-
Remote
Terminal
must
be
similarly
-:o
nnected.
The
DRS-lA
-8-
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control
and
metering
connections
should
not
be
made
until
th
e
studio
and
transmitt
e r
units
of
the
DRS-
lA
have
been
interconnected
and
conf
irm
ed
as
operationa
l.
The
Control
Te
rminal
sends
frequency-shift
-
keyed
(FSK)
control
signals
in
the
region
of
2300
Hz
to
2500
Hz
to
the
Remote
Ter
-
minal
.
In
the
wire-line
DRS-
lA
W
system
,
these
signals
are
sen
t
to
the
transmitter
via
a
telep
hone
line
.
In
the
radio
DRS-
lAR
system,
the
signals
are
sent
via
a s
ub
carrie
r
on
a
radio
link.
The
Remote
Terminal
returns
FSK
telemetry
signa
ls
in
the
r
egion
of
1300
Hz
to
1
500
Hz
to
the
Contro
l
Te
rmin
al
via
te
l
ephone
line
o r
subcarrier
.
As
an
op
tion,
subaudible
signals
up
to
45
Hz
may
be
sent
via
a s
ubcarrier
(SCA)
on
an
FM
broadcast
transmitter.
The
DLS
-1
Logger
may
sha
r e
the
DRS-
lA
telemetry
data
link
.
The
DLS-1
FSK
frequencies
are
750
Hz
to
900
Hz.
In
addition,
modulation
information
derived
from
a
monitor
may
share
the
data
lin
k
in
th
e
region
of
300
Hz
to
500
Hz
.
The
wire-line
system
is
illustrat
ed
in
block
diagram
form
in
Figure
4,
anq
the
radio
system
is
illustrated
in
Figure
5.
B .
Wireless
Operation
for
FM
Broadcast
T
ran
smitters
If
the
telephone
line
interconnection
is
not
used
,
the
con
trol
signa
ls
are
sent
to
the
transmitt
er
site
by
using
subca
rrier
te
chniques.
As
shown
in
Figure
5,
the
control
FSK
modulator
at
the
studio
frequ
ency-modu
l
ates
a
subcarrier
gene
rat
or.
The
output
of
this
subcarrie
r
generator
is
then
applied
to
t
he
multiplex
or
subcarrier
i
nput
of
an
aural
STL
(microwave)
transmitter.
In
this
manner
,
the
control
signa
ls
II
ride
piggyback"
on
the
STL
going
to
the
trans-
mitter
site.
This
subcarrier
generator
is
a
standard
addition
to
the
Cont
rol
Terminal
of
the
DRS-
l
AR
for
wireless
opera
tion.
At
th
e
transmitter
s
ite
the
subcarrie
r o
utput
from
the
aural
STL
receiver
is
applied
to
a
subcarrier
demodulator
lo
cated
in
the
DRS-
IA
Remote
Term
inal.
The
o
utput
from
this
demodulator
is
a
replica
of
the
control
s
ignal
which
originated
at
the
studio.
This
DRS-lA
-9-
www.SteamPoweredRadio.Com
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NTAOL
co
IN
,
PUTS
~
1999
MAOOIJT
- -
STUDIO
SITE
OIG
I
TAL
CONTRO
L -
ENCODER
•
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r-
----7
I
OPTIONAL
I
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STATUS
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READOUT
-- - ---- - - - - -
STUDIO
S
ITE
TRANSMITTER
SITE
CONTROL
,sK
MODULATOR
TELEMETRY
P'SK
OR
PIIASE-
S14
1
FT
DEMODULATOR
0
SUICAAAl!R
GENERATOR
MULTIPLEX
PORTION
OF
MICROWAVE
LINK
GOINC.
TO
TRANSMITTER
S I
TE
SUICAARIEA
DEMODULATOR
1.- - 7
MULT1PL!X
PORT
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10
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OPTIONAL
OF
FM
OR
TV
SUBCARRl!R
SU8CA!IRIER
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SIGNAL
t
C.ENERATOR
DEMODULATOR
RETURN
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STUD
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CONTROL
l'SK
DEMODULATOR
TELEMETRY
,SK
OR
PHASl!:-SHIFT
IIIODULATOR
0
FIGURE
5. O
RS
-lAR
REMOTE
CONTROL
SYSTEM
WITH
RADIO-
LINK
INTERCONNECTION
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GITAL
C.ONTAOL
DEC.ODEA
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DIGITAL
TELEMETRY
ENC.ODER
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S.
ELECTOR
UNITS
1 -
10
II - 20
2
1-
30
SAMPLE
INPUTS
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signal
is
then
internally
applied
to
the
control
FSK
demod
u
lato
r
in
the
DRS-lAR
as
in
the
basic
system.
The
subcarrier
demod
ul
ato
r
at
the
transmitter
s i
te
is
a
standard
addition
to
the
remote
term
i
na
l
of
the
DRS
-
lAR
for
wireless
operation
.
In
this
same
manner,
the
telemetry
signals
may
be
returned
from
the
transmitter
to
the
studio
by
using
a
subcarrier.
As
shown
in
Figure
5,
the
telemetry
FSK
modu
l
ator
frequency-modulates
a
sub-
carrier
generator
at
the
transmitter
site.
This
subcarrie
r
gen-
e
rat
or
is
usually
a
part
of
the
main
FM
transmitter.
As
with
the
control
signals,
the
fe
l
emetry
signal
now
rides
piggyback
on
the
broadcast
carrier
in
the
form
of
an
SCA
signal
which
is
then
re-
ceived
at
the
studio.
Here
the
subcarrier
is
extracted
and
demod-
ulated
by
an
SCA
receiver
or
SCA
modulation
monitor
.
The
output
of
this
receiver
or
SCA
demodul:ator
is
a
replica
of
the
telemetry
signa
l
generated
at
the
Remote
Termina
l.
When
the
telemetry
signal
is
returned
to
the
studio
in
this
manner,
it
is
customary
to
use
the
optional
subaudible
frequency
range
for
the
telemetry
signal.
In
this
case,
the
telemetry
phase
-
shift
modulator
and
demodulator
are
factory-installed
as
shown
at
11
A11
and
11
D"
in
Figure
5
instead
of
the
FSK
modems.
In
this
way
,
program
material
such
as
background
music
may
also
be
broadcast
on
the
SCA
subcarrier.
This
low-frequency
telemetry
signal
is
usually
adjusted
to
modulate
the
SCA
subcarrier
about
14
dB
below
program
._
Because
it
is
in
the
low
audio
spectrum
and
because
it
modulates
the
subcarrier
at
a
low
level,
it
causes
little
degradation
of
the
music
service.
Before
the
program
signal
is
mixed
with
the
subaudible
telemetry
signal
at
the
transmitter
site,
the
program
signal
MUST
be
fed
through
a
high-pass
filter
to
prevent
the
low-frequency
program
material
from
interfering
with
the
telemetry
signal.
This
filter
should
be
down
10
dB
at
80
Hz,
and
20
dB
at
70
Hz,
and
35
dB
or
more
at
50
Hz
and
below.
A
suitab
le
high-pass
filter,
with
6000
input
and
output
impedances
and
a
nominal
insertion
loss
of
6
dB,
is
the
Moseley
Associates
Type
2-
1388.
DRS-
l A
-1
2-
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If
the
FM
transmitter
does
not
contain
an
SCA
generator,
then
a
subcarrier
generator
is
installed
at
the
transmitter
site
as
shown
at
"B"
in
Figure
5.
If
program
service
is
to
be
accommodated
,
the
Moseley
Associates
Model
SCG-8
SCA
Generator
is
recom-
mended.
No
modifications
are
necessary
to
it
or
to
the
DRS-lAR
for
such
operation.
If
program
service
is
not
a
requirement,
then
an
internal
subcarrier
generator
can
be
added
to
the
DRS-
l A
Remote
Terminal.
This
telemetry
-
only
SCA
generator
is
installed
in
place
of
the
subcarrier
generator
jumper/terminating
board
in
the
DRS-
lA
Remote
Terminal.
Such
a
subcarrier
generator
is
an
optional
item
which
may
be
easily
added
to
the
standard
DRS-
lAR
Remote
Terminal.
If
the
receiver
or
monitor
at
the
studio
does
not
have
an
internal
SCA
demodulator
but
a
sample
of
the
broadcast
subcarrier
is
available,
then
a
subcarrier
demodulator
can
be
added
to
the
Con
-
trol
Terminal
of
the
DRS-
lA
as
shown
at
·
"C"
in
Figure
5.
This
subcarrier
demodulator
will
accept
the
subcarrier
and
demodulate
it
to
recover
the
metering
signal.
This
signal
is
a
replica
of
the
original
telemetry
signal
generated
at
the
transmitter
site.
It
is
internally
routed
to
the
telemetry
demodulator
in
the
DRS-
!A
Control
Terminal.
This
added
subcarrier
demodulator
at
the
studio
site
is
an
available
option
which
may
be
added
to
the
standard
wire
l
ess
DRS-lAR.
When
the
interna
l
subcarrier
units
are
em-
ployed,
the
standard
high-
speed
(
1300
Hz
to
1500
Hz)
telemetry
system
is
usually
preferred
since
no
program
provisions
are
pro-
vi
ded.
The
FSK
modems
are
factory
-
installed
as
shown
at
"A
11
and
11
D"
in
Figure
5.
C.
Wireless
Operation
for
TV
Transmitters
Figure
5
also
illustrates
a
typical
TV
installation.
The
telemetry
signa
l
usually
returns
as
a
subcarrier
of
the
TV
aural
signal
at
39
kHz.
The
high-speed
(FSK)
telemetry
modems
are
recommended
for
t
his
purpose
.
Control
signals
may
be
re
l
ayed
to
the
transmitter
site
in
a
num-
be r
of
different
ways
.
An
FM
subcarrier
as
shown
in
F i
gure
5
D
RS-
l A
-1
3-
www.SteamPoweredRadio.Com
may
be
multiplexed
on
an
aural
STL.
Alternately,
a
spare
sound
channel
of
a
video
STL
may
provide
the
interconnection
path.
In
these
instances,
a
DRS-
IA
W
configuration
will
be
supplied.
Figure
4
depicts
the
use
of
the
BNC
connectors
for
this
type
of
application.
D .
Equipment
Location
Providing
that
installation
personnel
understand
the
principles
in-
volved
for
the
particular
version
of
the
DRS-
lA
being
used,
instal-
lation
of
the
Control
and
Remote
Terminals
may
proceed.
The
first
stage
of
the
installation
will
involve
the
remote
control
units
only;
no
connections
will
be
made
to
the
transmitting
equipment.
After
the
remote
control
units
are
installed
and
their
operation
is
confirmed,
the
remainder
of
the
installation
will
be
accomplished.
Since
the
Control
Terminal
will
receive
frequent
operator
attention
during
the
routine
controlling
and
logging
operation,
its
location
at
the
studio
should
receive
careful
attention.
Since
occasional
re-
adjustment
of
the
front
-
panel
controls
at
the
transmitter
site
may
be
required,
this
unit,
too,
should
be
mounted
at
an
appropriate
height.
In
each
case
it
is
recommended
that
the
racks
should
be
well-bonded
to
a
good
system
ground
.
E.
Studio-Transmitter
Interconnections
The
various
interconnections
should
now
be
made.
The
control
path
to
the
.
transmitter
site
arid
the
telemetry
path
returning
to
the
studio
should
be
completed.
This
may
be
nothing
more
than
just
connecting
the
telephone
line,
or
it
may
involve
the
full
complement
of
sub-
carrier
equipment.
Figure
6
illustrates
the
telephone
line
con-
nections,
and
no
comment
is
needed
.
Figure
7
illustrates
subcarrier
and
radio
equipment
connections
and
should
be
understood
to
.
avoid
error
.
Occasional
reference
to
Figure
5
may
be
helpful.
At
the
studio
the
contro
l
output
connection
will
normally
deliver
a
subcarrier
frequency-modulated
by
the
control
tone.
This
subcarrier
wi
ll
be
routed
to
the
STL
transmitter
mult
i-
plex
or
subcarrier
input.
If
the
DRS-
l
AR
internal
subcarrie
r
gen-
erator
is
not
.
used,
it
is
replaced
by
a
jumper/terminat
i
ng
boa
rd,
and
the
control
output
connector
wi
ll
deliver
the
control
FSK
tones.
DRS-IA
-
14-
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www.SteamPoweredRadio.Com
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TELEPHONE
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REAR
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CONTROL
TERMINAL
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REAR
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REMOTE
TERMINAL
FIGURE 6 - TELEPHONE
LINE
INTERCONNECTIONS
POWER
INPUT
( 120
OR
240
VAC)
I •
POWER
INPUT
( 120
OR
240
VAC)
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