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TFT 763 User manual

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I
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1:
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I
MODEL
763
FM
MODULATION
MONITOR
lTlEm
TIME
.A~ID
FREQUENCY
TECHNO
'
LOGY,
INC~
www.SteamPoweredRadio.Com
Serial
No.
Revision Level.
C
December
1980
----
.
MODEL
763
FM
MODULATION
MONITOR
TIME
&
FREQUENCY
TECHNOLOGY,
INC.
3090
OAKMEAD
VILLAGE
DR.
P.O.
BOX
58088
SANTA
CLARA,
CA
95052
(408)
727-7272
TWi
910-338-0584
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www.SteamPoweredRadio.Com
✓
_
.,__
TFT
OPE
RJ:
.T
ION
MANUAL
ADDENDUM
M
ODEL
7
63
.
11\ANUAL
REVISION
LE
VEL
EFFECTIVITY S/N
-----
-----
!M?OF;
AN
T
MANUAL
CHANGES
This adde
nd
um
s
how
s t
he
comp
on
ent
va
lues
needed
to
cha
noe
the
meter
an
d audio
ci
r
cuits
in
the
mode
l .
763
fro
m
75
us
ec
to 50 usecs deemohasis
Schematic
f.
.ssy
0119
.
Refey-e
nc
e
de~
iqnator
Va
lues
for
-,..,
J V usec
De
-
emohas
is
6601
-
157
0
6608
-1
050
C78
.047 ufd
6601
- 1
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0
6608
-1
050
C121
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e 5/
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SECTION
1
1.1
1.2
1.3
1.4
1
.5
SECTION
2
2.1
2.2
2.3
2.4
2.5
2.6
SECTION
3
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.
9 .
3.10
3.11
3.12
SECTION
4
4.1
4.2
4.3
4.4
f,()OEL
763
FM
MlDULATION
MONITOR
TABLE
OF
CONTENTS
GENERAL
INFORMATION
Page
General Description.
...
....
.............
...
1-1
Specifications..................
.
..
......
..
1-1
Accessory Equipment......
....
......
........
1-3
Warranty.....
...
......
.......
....
..
........
1-4
Claim
for
Damage
in
Shipment...
......
..
...
. 1-4
INSTALLATION
Unpacking
and
Installation.......
.....
...
..
2-1
Power
Requirements......
.....
....
.........
.
2-1
Installation
and
Connections.
......
.
.......
2-1
t-t>del
704F
Connections
....
........
...
......
2-2
Composit
Output
Connections.......
....
.....
2-2
Field
Installation
of
Options.
...
..
.......
. 2-3
OPERATION
General
_.........................
.......
....
3-1
Turn-On
and
Wann-Up........................
3-1
Front
and
rear
panel controls
and
connections
••••••••••••••••••••••
;....
3-1
Setting the Carrier
Level
into the rt>nitor. 3-5
Measurement
of
FM
f.t>dulation using
tt>dulation
Meter............
..
........
3-5
t<l!asurement
of
AM
f.t>dulation using
f.t>dulation
Meter........
.....
...
..
....
3-6
Measurement
of
FM
t-bdulation
Peak
Flashers..
......
........
........
. 3-6
Measuring
Residual
Noise........
...........
3-6
Distortion
Measurements...........
.........
3-6
Use
of
the
f.t>del
704F
Remote
Meter
and
Flasher Panel.
.......
.................
3-6
Carrier
Power
alanns (optional)
••••
•
~......
3-7
tt>dulation
Alann
_
(optional)....
.....
.......
3-7
THEORY
OF
OPERATION
Block
Diagram
•••••
~........................
4-1
AM
Detector
and
Carrier
Level
Circuits.....
4-2
Local
Oscillator....
.
..............
........
4-2
First
Mixer.........
............
.....
...
...
4-2
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...
SECTION
4
TABLE
OF
CONTENTS
(Continued).
(Continued)
4.5
4.6
4. 7
4.7.1
4.8
4.9
Limiting Amplifier
and
Discriminator••
4-3
Baseband
Lowpass
and
amplifier
••••
••••
4-3
Calibration Signal Generator
and
Lowpass
••••••••••••••••••••••••••
4~3
Peak
Flasher
Lowpass
Filter
•••••••••••
4-3
Inverting Amplifier
•••••••••••••••••••
4-3
Thumbwheel
Current Source
and
Peak
Detectors
••••••••••••••••••••••••
4-4
4.10
Audio
.Ar.lplifiers
••••.
•••
••••.•••••••..
4-4
4.
11
Meter Amplifiers,
Peak
Meter
Detector
and
Averaging
Meter
Detector•• •••
4-4
4.12
Power
Supplies
••••••••••••••••••••••••
4-5
SECTION
5
MAINTENANCE
General
Access
SECTION
5.
1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.8.1
5.8.2
5.
8.3
5.8.4
6
6.1
6.2
6.3
6.4
6.5
6.6
6.7
Periodic Maintenance
Modulation
Accuracy
Check
Calibration
Circuit
Adjustment
Modulation Attenuator
Check
RF
Level
and
AM
Modulation Circuitry
Checks
Trouble Shooting
Guide
Meter
and
Flashers Inoperative
Modulation
Meter
Inoperative
Peak
Flashers Inoperative
RF
Level
and
AM
Modulation Circuitry Inoperative
SCHEMATIC
DIAGRAMS
Block
Diagram
Wiring
Diagram
Moni
-
tor
Schematic
Carrier
Fail
Alann
Carrier
Power
Alarms
(Optional)
Modulation
Alann
(Optional)
Remote
Meter
and
Peak
Flashers (Accessory)
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1.1
SECTION
1
GENERAL
INFORMATION
General Description.
The
Model
763
FM
Modulation
Monitor
is
designed for
continuous monitoring of
an
FM
broadcast
transmitter
operating in the
frequency range
of
88 to
108
MHz.
The
monitor
is
factory-adjusted for
the customer's assigned
transmitter
frequency. Features include:
1.2
RF
Input
Flashers
to
indicate
when
a
preset
modulation
percentage
is
exceeded
on
either
positive
or
negative peaks.
Adjustab
le
attenuator
for reading residual
AM,
noise
and
low
percentage modulation
on
the modulation
meter.
Wide
audio bandwidth.
Internal
calibration
circuit
to check
the
modulation
meter
and
peak
flashers.
Carrier-fail
alarm to
indicate
loss
of
RF
input to
the Monitor.
Low-level audio output
for
aural
program
monitoring•
Three options,
all
field
installable:
Carrier
Power
Alann
Modulation
Alann
Balanced
Audio
Output
S
pecifications
.
Frequency
Range
RF
Input Voltage
Range
Input
Impedance
88
to
108
MHz
l to
7
volts
nns
50
ol'lns
nominal
Modulation Meter
Deviation
for
100
%indication
Meter
Range
Attenuator
Range
Accuracy
(5-kHz
modulation)
Frequency
Response
Characteristics
Remote
Output
1-1
+75
kHz
Oto
133%
Oto
-50dB
in 10-
dB
steps
+2'.t
at
all
iiiodul
ati
on
percentages
+0.1
dB
from
100
Hz
to
75
kHz
+0.25
dB
from
50
Hz
to
100
kHz
Peak-reading
circuit.
Scale
and
ballistics
confonn to
FCC
re
qui
remen
ts
Suitable for
driving
two
Model
704F
Remote
Readout
Panel
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.
..
-
..
,
i
I
i
1.2
(Continued)
Peak
Modulation
Indicators
Deviation for
100%
Indication
Peak
Level
Accuracy (5-kHz modulation)
Frequency Response
Response
Time
Accuracy
(1
cycle
of
50
kHz)
Remote
Output
Modulation
Calibrator
Measurement of Residual
AM
Range
Accuracy
(at
-30
dB)
Audio
Outputs
(at
100%
modulation)
Composite Outputs (with
or
without 75-us
deempha-
sis)
Signal-to-Noise Ratio
(400
Hz
with
deempha-
sis)
Hannonic
Distortion
Intennodul
ati
on
Frequency Response
(
W/0
deemphasis)
Audio
Monitor Output
Stereo Monitor Output
SCA
Monitor Output
+75
kHz
Set
by
a front-panel
three-digit
thurnbwheel
switch
in
1%
steps
from
soi
to
129i
on
both
positive
and
negative peaks.
+2%
at
100%
modulation
+2%
from
400
Hz
to
50
kHz,
+4%
from
50
Hz
to
75
kHz
+2i
Suitable
for driving
two
Mode
1
704F
Remote
Readout Panels.
Built
in,
for
calibration
of
modulation meter
and
peak
flashers
from
the
front
panel .
0
to
-70
dB
+1
dB
5
volts
nns
into
5000
otwns
75
dB
o.a
max
•
o.
1i
max.
per
SMPTE
standard
+0.25
dB
from
50
Hz
to
i s
kHz
0
dBm
into
600
ohns
1
volt
nns
into
600
ohms
1
volt
nns
into
600
ohms
Carrier-Fail
Alarm
-Relay
drive
output capable
of
sinking
50
mA
at
30V
DC
when
RF
carrier
drops
below
50%
of
nominal.
Preselector
Input -
Direct
input to discriminator
for
use with
FM
presel
ector
Frequency
Input Level
1-2
700
kHz
100
mV
rms
for fu
11
limiting
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r
--.I.·,
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-,
..
..q
..iJ
1.2
(Continued}
Optional Features
Carrier
Power
Alarm
--,.
Modulation
Alarm
Balanced
Audio
Output
Level
Frequency
Response
Power
Requirements
Operating
TemperatuFe
Dimensions
1
.3
Accessory Equipment.
1.3.l
Model
704F
Remote
Readout Panels.
Two
relay
drive outputs,
one
for
carrier
level changes
of
+5%
and
the other for
+10%.
Each
output
is
capable
of
sinking
50
mA
at
30V
DC.
An
output capable of sinking
50
mA
at
30
V
DC
when
modulation drops
below
30%
for a period of time
between
2 seconds
and
1 minute,
internally
adjustable.
0
dBm
into
600
otllls
+1
dB
from
50
Hz
to
50
kHz
117/230V
AC
+10'1,
58
to
400
"z-
o C
to
50
C
19"
WX5-1/2" HX
14"
D
Rack
Mount
These
remote
modulation meter
and
peak
flasher
panels duplicate
the corresponding front-panel indications.
They
connect to terminals
on
rear-
panel
strips
Jl
and
J2
of
the
Model
763
through 5-conductor cables.
Power
for
_operating the
two
remote panels
and
drive for the
remote
me~er
and
·
peak
flashers
are supplied
by
the
Model
763.
,.
.
l
.3.
2
Model
724A
Stereo Monitor.
This instrument
is
for
use
by
stereo
FM
stations
to
meet
all
FCC
stereo monitoring requirements. Acomposite input
is
furnished
by
the
Model
763
.
1.3.3
Model
730A
SCA
Monitor.
The
Model
730A
enables
FM
stations
broadcasting
SCA
information
on
the
carrier
to meet
all
FCC
SCA
monitoring requirements.
The
Model
763
provides a composite input
to
the
Model
730A.
l
.3.
4
Model
764A/765A
FM
RF
Preselectors•
Either the
Model
764A
or
765A
allows the user to monitor the
transmitter
at
a remote
location.
Both
models
are
digitally
tunable
to
any
channel in the
FM
band
.
The
Model
764
has a
digital
frequency
error
readout,
the
765
does
not.
..
1-3