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111
Powdermill
Road, Maynard,
Mass.
SERVICE
BULLETIN
For
MODEL
310E BROADCAST
MONITOR
FM TUNER
SPECIFICATIONS
(These
specifications
are minimum
- all H. H.
Scott
310E
tuners
must
meet
or exceed
these
figures.
Usable
Sensitivity
(IHFM)
(For
less
than
3R Total
Noise,
distortion,
hum - 30 db)
1.9 microvolts
Cross Modulation
Rejection
85 db
Signal
to Noise
Ratio
65 db below
100% modulation
Total Harmonic
Distortion
0.5%
Frequency Deviation
0.02%
Frequency
Response
20-15,000
cps + 1 db
Capture
Ratio
2.2 db
Selectivity
50 db
Spurious
Response
Rejection
90 db
Hum
66 db
AM Suppression
60 db
Separation
In excess
of 30 db
Audio
Output
(100% modulation)
4 - 6 volts
Tuning
Range
87-109
mc
Accuracy of Calibration
0.5%
Output
Impedance
3000
ohms
Minimum
Recommended
Load
Resistance
100,000
ohms
Minimum
Recommended
Cable
Capacitance
1000
mmfds
Maximum
Recommended
Length
of Output
Lead
70 feet
Range
of Line
Voltage
and
Frequency
Power
Consumption
- AC ONLY
- DO NOT
OPERATE
WITH
DIRECT
CURRENT
GENERAL
SERVICE
NOTES
105-125
volt 50/60 cps
50 watts
Service,
other
than
replacement
of either
pilot
lights
or vacuum
tubes,
is usually
not
required.
If the
tuner
is not
operating
properly,
all
external
connections
should
be checked
to make
sure
that
the
difficulty
is in the
tuner.
Generally,
it is advisable
to
replace
the
connection
to the
tuner
with
a tape
recorder
or
similar
device
to check
out
the
amplifier
performance,
If the
difficulty
appears
to be
located
in the
tuner,
the
level
controls
should
be first
checked,
to
insure
that
they are
rotated
away
from
their
extreme
counter-clockwise
positions.
Then,
the vacuum
tubes
should
be checked
by
replacing
them with
new
ones,
one
by one.
The
tubes
should
be tight
in their
sockets
and
provided
with
shields
where
applicable.
Tube
defects
frequently
do
not
show
up_in
a tube
tester.
Only operation
in the
tuner
will
insure
the
proper
working
of a vacuum.
())
D-310E-2
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