QEI 675 User manual

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TABLE
OF
CONTENTS
,
SECTION
1
GENERAL
INFORMATION
1-1
.Description
1-2
Electrical
S~ecifications
1-3 Mechanical
Spedfications
1-4 Instrument
[dentification
1-5
Acces
so
•
ri
es
SECTION
2
INSTALLATION
2-1
Initial
Inspection
2-2 Preparation•for
Use
2-3
Repacking
for
Shipment
SECTION
3
OPERATI.ON
3-1
Operator Controls
and
Indicators (Front
Panel}
3-2 Controls
and
Connections (Rear Panel}
3-3
Initial
Operation
3-4
Normal
Operation
-
SECTION
4
THEORY
OF
OPERATION
4-1
General
4-2 Detail
Circuit
Destription
SECTION
5
ALIGNMENT
AND
TROUBLESHOOTING
5-1
Equipment
Required but
Not
Supplied
5-2
FMO
and
Phase
Lock
Assembly
Alignment
5-3
Power
A~plifier
Alignmen~
5-4 Exciter-Transmitter.Interface
5-5 Troubleshooting
5-6
Power
Tran~fo~mer
Wiring
SECTION
6
PARTS
LISTS
SECTION
7
SCHEMATICS,
LAYOUTS,
WAVEFORMS
SECTION
8
OPTIONS

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-
SECTION
l
-
GENERAL
INFORMATION
1-1
DESCRIPTION
1-2
The
QEI
Type
675
FM
Exciter
is
an
all
solid
state,
on
carrier
direct
FM~
phase locked, frequency synthesized
exciter
designed
to
meet
or
exceed the
FCC
requirements
for
use in the standard
FM
broadcast
band
(88-108
MHz).
The
Exciter
may
be
programmed
to operate
on
any
100
KHz
increment in the
FM
band
using the
same
high
stability
8
MHz
crystal
as .a reference.
The
Exciter
is
manufactured in a standard
3½
11
X
19
11
rack
mount.
All
operator
controls,
adjustments
and
indicators
are
located
on
th~
front
panel. Signal
input
and
output connections,
fuse,
AC
power
and
the
MONO-COMP
switch are
lo-
cated
on
the
rear
panel.
The
Exciter
is
all
solid
state,
employing
silicon
transistors"
diodes
and
in-
tegrated
circuits.
The
Exciter
features
phase locked stabil.,ity
and
on
carrier
direct
FM
for
full
multiplex operat,ion with freedom
from
spurious responses.
The
Power
Amplifier
is
capable
of
withstanding
any
magnitude or·phase
of
VSWR
.
and
the
power
output
is
adjustable
from
less
than 5 to
greater
than
20
watts.
ELECTRICAL
SPECIFICATIONS
Primary
Power
Power
Consumption
Power
Output
Frequency
Range
Type
of
Emission
Modulation Capability
(less
than
1%
THO)
Frequency
Stability
Output
Impedance
VSWR
Protection
Harmonic
and
Spurious
Suppression
l05-125/210-250
Vac
50/60
Hz.
Approximately
50
watts
max.
Adjustable
from
less
than.5
to
greater
t.
han
20
watts.
88
MHz
to
108
MHz
(programmable).
180F3
or
300F9.
150
KHz
peak.
+
500
Hz
(-10°C
to
+55
6C).
50
·
Ohms.
Any
magnitude
or
phase.
Better
than
80dB.
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I

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1-3
Mono Input
a. Impedance
b. Level
c. Pre-emphasis
Stereo Input
a.
Impedance
b. Level
SCA Inputs (2)
600 Ohms (balanced).
+10 dBm for 75 KHz dev. @400 Hz.
75 usec + 1 dB (50 usec optional).
lOK.
4V pp for 75 KHz de viation.
a
a. Impedance
------ lOK.
b. Le vel
""T"
Distortion
FM Noise (below 75KHz dev.
with
75 usec de-emp.)
AM Noise
Stereo Separation
Crosstalk
(Main to SCA)
Crosstalk (SCA to Main)
Environmental
MECHANICAL SPECIFICATIONS
Dimensions
Mounting Dimensions
Net Weight
Shipping Weight
Maximum Operating Temp.
JYp p for 10% inj ection.
0.35% max. THO@ 75 KHz dev.
Better than -70dB.
Better than -55dB.
Better than 40dB from 30Hz to 15KHz
with QEI Model 772 Stereo Generator.
-55dB.
-65dB.
0°C to +55°C operating. (-15°C to
+55°C with 30 minute warm up.)
3½"H X 19"W X
14
11
D.
Figure 2-1.
13 pounds
17 pounds
131°F (55°C)
Ambient.
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1-4
INSTRUMENT
IDENTIFICATION
This
unit
is
identified
by
a
Model
Number
and
a
six
digit
serial
number
located
on
the
rear
panel.
All
correspondence
to
your
sales
representative
or
the
factory
in regard
to
this
unit
should
reference
the complete
Model
and
Serial
Numbers.
1-5
ACCESSORIES
The
Exciter
may
be
used -as a
10
Watt
Transmitter
with the accessory
Meter
Panel. This Panel contains Final
Amplifier,
and
Incident
and
Reflected
Pow-
er
,Metering, di~ectiorial ~oupler ~nd ~ignal sampler.
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