Harman Kardon The Citation Fifteen User manual

The Citation Fifteen
Professional FM/Stereo FM Tuner
harman /kardon Instruction Manual
THE MUSIC COMPANY

TABLE OF CONTENTS
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LIST OF ILLUSTRATIONS
Rear Panel yo eda es. du eens aee xd
Front Panel ....................

INTRODUCTION
Your new Citation Fifteen tuner is part of a family of high fidelity
equipment deliberately designed to effect breakthroughs in the quality
of sound available in your home. The Citation Fifteen tuner has cre-
ated new standards against which all other tuners will be measured.
Starting with the most advanced concepts in electronic technology,
. Harman/Kardon engineers developed new instrumentation and
new features. The introduction of the Citation Fifteen is significant.
for us...and for you.
SOME OF THE FEATURES YOU ARE ABOUT TO ENJOY ARE:
¢ A revolutionary QUIETING METER (patent. pending). that meas-
ures the signal-to-noise ratio of the incoming signal.
¢ Optimum phase linearity in the RF and IF sections, providing an
audio signal virtually free from IM, THD and phase distortion that
continues the Citation tradition of “straight wire with gain’. Mullti-
‘ plex phase-locked loop circuits that sense and quantify phase error
in incoming pilot signals and automatically make corrections.
PLUS THESE OUTSTANDING FEATURES:
FOUR SECTION GANG FM FRONT END. Suppression is more than
100 db eliminating all spurious responses.
IF FILTER with sealed 9 pole phase linear LC network combines
excellent phase linearity with outstanding alternate channel rejection.
IF STRIP with 2 extremely high gain ICs provides extraordinary
hard limiting of noise.
RATIO DETECTOR of unique design ensures precision linearity and
exceedingly low distortion.
SPECIAL WIDEBAND CIRCUITRY permits feeding the composite
signal into external, discrete, 4 channel stereo adapter without loss
of phase linearity or amplitude.
400 CYCLE CALIBRATION REFERENCE TONE adjusted in ampli-
tude, equivalent to 50% modulation, facilitates level setting of
reel-to-reel or cassette tape recorders.
CENTER TUNING METER augments quieting meter for lowest dis-
tortion point.
FM STEREO NOISE FILTER eliminates background noise from
weak signals.

WARRANTY POLICY
We warrant each factory wired tuner to be free from defects in
material and workmanship under normal use and service, and in
accordance with the conditions set forth below. Should a defect occur
within the period specified, and, providing the unit is returned to
either HARMAN/KARDON or an authorized HARMAN/KARDON
warranty station, transportation prepaid, and which our examination
shall disclose to our satisfaction to be defective, we will, for a period
of two (2) years from date of original purchase, either replace or repair
and install any defective parts free of charge.
To obtain service under the terms of this policy, it is necessary for
you to retain your ORIGINAL BILL OF SALE.
In the event your equipment requires service during the warranty
period, only presentation of your original bill of sale to either a
factory-authorized repair agency or the factory, itself, will insure your
rights under the policy, as outlined in this manual.
The Citation warranty does not include packaging or transportation
charges to and from the factory or authorized warranty repair station.
This warranty is not applicable to any unit which shall have been
repaired or altered in any way so as, in our judgment, to affect its
reliability or stability or general performance or has been subject to
neglect, misuse, abuse, negligence or accident; or which has had the
serial number altered, effaced or removed. Neither shall this warranty
apply to any instrument which has been connected other than in ac-
cordance with instructions furnished by us.
This warranty is in lieu of all other warranties, expressed or implied,
and of all other obligations or liabilities on our part, and we neither
assume nor authorize any representative or other person to assume for
us any other liability in connection with the sale of this instrument.
UNPACKING
After unpacking the Citation Fifteen, inspect it carefully for signs
of transit damage. The tuner was subjected to numerous quality con-
trol tests and inspections prior to packing and should therefore be in
perfect operating condition. If damage is visible, notify your dealer at
once. If the tuner was shipped to you, notify the transportation com-
pany without delay. HARMAN/KARDON will cooperate with you in
such instances, but only YOU can recover from the carrier for damage
incurred during shipment.
SERVICE
HARMAN/KARDON has a special customer service division to
answer all questions pertinent to the installation and operation of your
unit. Please feel free to write to us at any time for prompt and com-
plete advice.
Hf your problem cannot be resolved through our combined efforts,
we may refer you to a local authorized repair agency or authorize
the return of your unit to the factory. To aid us in selecting a service
station convenient to you, it would be helpful if you would indicate
the major city closest to your home.
Please address your inquiry to:
Customer Service Department
HARMAN/KARDON, INC.
Plainview, New York 11803
Be sure to include the model and serial number of your unit.
In the event it must be returned, an authorization form and proper
packing instructions will be forwarded to you. This authorization form
MUST BE RETURNED with your unit.
UNDER NO CIRCUMSTANCES SHOULD YOUR UNIT BE SHIPPED
TO THE FACTORY WITHOUT PRIOR AUTHORIZATION.

INSTALLATION
The
Citation
Fifteen
produces
very
little
heat
and
may
be
installed
without
regard
to
normal
ventilation
requirements.
However,
if
you
are
installing
the
unit
in
custom
cabinetry,
it
is
recommended
that
you
avoid
placing
the
tuner
directly
over
heat
producing
units
such
as
a
basic
amplifier
or
tube-type
preamplifier.
(A
handsome
walnut
en-
closure
or
custom
cabinet
is
available
from
your
dealer
as
optional
equipment.}
POWER REQUIREMENTS
The
AC
line
cord
plug
may
be
inseried
into
any
outlet
furnishing
117
volts,
50/60
Hz
AC
current.
(Voltage
may
vary
between
105
and
125
volts.)
For
use
in
areas
which
provide
210
to
250
volts
AC,
50/60
Hz
cur-
rent,
the
Citation
Fifteen
may
be
rewired
as
shown
on
the
schematic
diagram
in
the
Technical
Manual.
However,
rewiring
should
be
done
only
by
an
authorized
technician.
Unless
otherwise
indicated,
all
Citation
Fifteen
tuners
have
been
factory
wired
to
operate
at
a
nominal
voltage
of
117
volts
AC.
AC CONVENIENCE RECEPTACLE
An
AC
convenience
receptacle
is
provided
on
the
rear
panel
of
your
Citation
Fifteen.
Any
equipment
connected
to
this
receptacle
will
be
controlled
by
the
on/off
switch
of
the
tuner.
It
is
therefore
recom-
mended
that
this
receptacle
be
used
for
tuner
associated
accessories
such
as
an
antenna
rotator,
antenna
booster,
quad
decoder,
etc.
FUSE
The
Citation
Fifteen
is
protected
by
a
STANDARD
FAST
BLOW
fuse
located
on
the
rear
panel.
If
this
fuse
is
blown,
it
is
to
be
replaced
only
with
one
of
the
SAME
TYPE
and
SAME
RATING.
It
is
important
to
note
that
replacing
the
FAST
BLOW
FUSE
with
a
slow
blow
type
or
with
a
fuse
of
higher
rating,
WILL
PREVENT
MAXIMUM
PROTECTION
of
the
tuner
and
could
result
in
severe
damage.
Such
damage
will
not
be
covered
by
the
Factory
Warranty.
VOLTAGE
(50/60
Hz)
FUSE
TYPE
FUSE
RATING
105-125
VAC
3AG
or
AGC
1.5
Amperes
210-250
VAC
3AG
or
AGC
1.0
Amperes
ANTENNA
In selecting an antenna system for use with your Citation Fifteen
please keep in mind that your tuner’s full potential and performance
capability can only be achieved when you provide the best possible
signal to the antenna terminals.
If you live in a metropolitan area (or if you wish to receive signals
from many directions) an ordinary crossed dipole, conical or three
element in-line antenna should serve adequately. The three or four
element in-line (uni-directional) type is the most satisfactory of the
group, but due to its high directivity, it becomes necessary to include
an antenna rotator to change the direction of the antenna for best
reception,
For near-fringe and fringe reception, a six-to-eight-element log-
periodic or Yagi is recommended. Both types are excellent and offer
superior front-to-back ratio, (ratio of forward pickup to that at the
rear, greater gain and rejection of noise. Both types are highly direc-
tional and require a rotator. Far fringe reception requires an antenna
with eight or ten elements. This type antenna is usually quite heavy
and requires extra support and bracing when installed.
Remember, FM stereo reception requires greater gain than standard
monophonic FM. It is therefore, advisable to purchase the antenna
which can “pull in” a station with the greatest gain and lowest
possible noise.
Are there high-rise buildings in your area? Water towers? Gas
tanks? Mountains? They can all cause serious reception problems by
reflecting FM signals which, when received, will result in audible
distortion. This form of distortion is known as multipath interference
and is similar to “ghosts” on your TV set.
Multipath interference can be reduced or eliminated by purchasing
a highly directional antenna with a rotator. Proper orientation of the
antenna may tune out multipath completely, or alternate it below
audibility.
If installed properly, an outside antenna will reject unwanted sig-
nals, local noise, multipath interference, and provide greater signal
strength than any elementary type. Increased signal strength usually
results in the reception of additional stations with amazing clarity.

Nj TRANSMITTER
CHOICE OF TRANSMISSION LINE
The
major
types
of
antenna
lead-in
wire
available
are
flat
ribbon,
tubular,
foam,
coaxial
and
encapsulated.
Each
type
has
specific
ad-
vantages
which
must
be
weighed
against
the
costs
involved
in
each
installation.
A
high-quality
100-mil,
20-gauge,
polyethylene
300-ohm
twin-lead
is
usually
satisfactory
for
most
installations.
Tubular
or
foam
line
provides
better
protection
than
flat
ribbon
against
the
elemenis
and
industrial
smog.
Coaxial
lead-in
is
useful
for
multiple-set
installations
and
to
reduce
pick-up
of
extraneous
noise.
Coaxial
line
has
a
higher-
loss
characteristic
than
twin-lead
(tubular
or
foam),
but
the
loss
is
constant,
and
can
easily
be
compensated
for
through
the
use
of
a
more
powerful
antenna.
The encapsulated 300-ohm line (also referred to as 300-ohm shielded
lead) has excellent weather-resistant characteristics and a somewhat
lower loss factor than coaxial.
To avoid signal loss, the transmission line should be kept as short
as possible and, preferably, should run vertically down to the set.
When using an external antenna with 300 ohm twin lead, connect
both leads to the two 300 ohm antenna terminals on the rear of your
tuner. If your external antenna is connected with 75 ohm coaxial
cable, connect between the 75 ohm and GND terminal, with the outer
conductor or shield of the cable connected to the GND terminal.
GROUNDING THE ANTENNA
An antenna can act like a lightning rod because it is often the
highest metal structure on the roof. It must therefore be grounded.
Attach a heavy-gauge aluminum wire to the mast and a lightning
arrestor to the transmission line where it enters the building.
On apartment-roof installations, a lightning arrestor may be at-
tached to the mast, and another to the transmission line where it
enters the building. In general, it is always advisable to keep the
lightning arrestor outside the home interior. Where ground rods are
used, they should be at least four feet long and deeply sunk into the
ground.
When selecting an FM antenna system remember the following:
1. The proper antenna should be used for a given location. The
further you are located from the FM transmitter, the more gain the
antenna must offer.
2. The antenna should have uniform signal level across the entire
frequency range it covers.
3. Antenna placement is extremely important for maximum signal
reception.
4, The installation must be rigid to avoid damage to the roof, chim-
ney, wall or other property.
5. Careful routing of the lead-in line to avoid pick up of local inter-
ference. A poorly routed lead-in line (which touches metal portions
of the house, etc.) will reduce signal strength by a significant
margin.
OUTPUT CONNECTONS
The Citation Fifteen provides five different output receptacles,
each designed for a specific function. One receptacle {Tape Out) is
located on the front panel and uses a standard %4” phone jack. The
other four, are located on the rear panel. All receptacles accept stand-
ard RCA phono jacks. In making your installation, you may use one
or more pair, depending on your requirements.
VARIABLE OUTPUT (L&R)
These receptacles may be connected either to the preamplifier or
directly to the basic amplifier. In either case, the level of signal at
these receptacles is controlled by the GAIN CONTROLS on the front
panel of your tuner. These Gain Controls may be used when adjust- -
ing the level of your tuner to match the level of other source material
connected to your system, such as phonograph, tape recorder, etc.

FRONT PANEL
EXTERNAL
DOLBY
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REAR PANEL
VARIABLE
MUTING
STEREO
75
OHM
SWITCHED
OUTPUT
THRESHOLD]
[THRESHOLD
ANTENNA
CONVENIENCE
LSA
RECEPTACLES
CONTROL
CONTROL
ERMINALS
RECEPTACLE
FUSE
FIXED DOLBY | 300 OHM
OUTPUT
RECEPTACLES
ANTENNA
RECEPTACLES
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TO LINE
QUAD CORD
DECODER

FIXED OUTPUT (L&R)
These
receptacles
provide
the
full
output
of
your
tuner
and
are
NOT
controlled
by
the
GAIN
CONTROLS.
They
should
be
connected
to
either
your
preamplifier
or
to
a
tape
recorder.
They
should
NEVER
be
connected
directly
to
a
basic
amplifier.
TO QUAD DECODER
The Citation Fifteen anticipates the further development and
standardization
of
four
channel
FM
broadcasting.
The
tuner
provides
an
output
receptacle
to
connect
FM
four
channel
signals
to
a
decoding
device
suitable
for
any
anticipated
quadriphonic
broadcast
system.
TAPE OUT
The
front
panel
receptacle
is
identical
to
the
FIXED
OUTPUT
located
on
the
rear
panel.
It
has
been
located
on
the
front
panel
as
well
to
provide
instant
accessibility
for
temporary
connection
to
a
tape
recorder.
DOLBY NR
Your tuner is provided with Dolby In and Out receptacles. These
may be used when you wish to listen to an FM broadcast which has
been
processed
with
the
Dolby
system.
Connect
the
two
(2)
Dolby
OUT
receptacles
to
the
input
of
your
external
Dolby
processor
and
the
two
(2)
Dolby
IN
receptacles
from
the
output
of
your
external
Dolby processor.
DESCRIPTION OF CONTROLS
Each control and tuning indicator of the Citation Fifteen has been
designed to perform a specific useful function — either individually
or in combination with others. In order to obtain the best possible
performance from your tuner, we suggest’ that you read the following
so
that
you
may
take
advantage
of
the
full
potential
of
these
controls
and indicators.
POWER SWITCH
This switch provides AC power to the tuner and to the AC con-
venience receptacle on the rear panel. When in the ‘‘ON” position, the
pilot light jewel below the switch and the meter and dial scale win-
dows will be illuminated. .
GAIN CONTROLS (Left & Right)
These
control
the
output
level
of
the
tuner
at
the
VARIABLE
OUT-
PUT
receptacles
on
the
rear
panel.
If
the
tuner
is
used
in
conjunction
with
a
basic
amplifier
only,
these
controls
will
adjust
the
system
gain.
When
connected
to
a
preamplifier,
these
controls
may
be
preset
to
match
the
level
of
other
signal
sources
connected
to
your
system.
The
volume
control
of
your
preamplifer
may
then
be
used
as
the
master
gain
control
of
your
system.
STEREO INDICATOR
The
“Stereo
Indicator’
light
indicates
when
the
Citation
Fifteen
is
reproducing
stereo
FM
broadcasts.
STEREO AUTOMATIC/MONOPHONIC SWITCH
Under normal use for all broadcasts, the stereo auto switch should
be in the “OUT” (stereo Auto) position.
Your
tuner
is
equipped
with
a
stereo
sensing
circuit
which
will
auto-
matically
determine
whether
your
unit
is
receiving
monophonic
or
stereophonic
broadcasts,
and
then
automatically
adjust
the
mode
of
operation.
If
the
station
is
transmitting
stereo,
your
tuner
will
automatically
switch
on
the
multiplex
section
and
you
will
hear
the
broadcast
in
full
stereo.
Should
the
station
conclude
broadcasting
in
stereo,
your
tuner
will
automatically
switch
back
to
monophonic
reception.
Should you receive a weak stereo signal whose quality has been
degraded
by
noise
or
poor
signal
conditions,
and
you
wish
to
listen
to this stereo broadcast monophonically, place the stereo auto switch
to the “IN” position.
STEREO THRESHOLD CONTROL
This rear panel control can be adjusted to determine the number of
stereo stations the tuner will reproduce when in the “OUT” position
of the stereo Auto/Mono switch.
In the full counterclockwise position, the automatic switching
circuits have maximum sensitivity and all stereo stations within the
range of the tuner will be reproduced. However, due to weak signals
(or their distance from your antenna) some stations will contain noise
levels which degrade performance when reproduced in stereo.

In
order
to
reproduce
these
stations
monophonically
(when
in
the
“OUT”
position
of
the
stereo
Auto/Mono
Switch],
rotate
the
STEREO
THRESHOLD
control
clockwise
until
only
good
quality
stereo
stations
are
reproduced.
EXT. DOLBY NR SWITCH
When
an
FM
station
broadcasts
a
Dolby
encoded
program,
it
may
be
decoded
by
use
of
an
external
Dolby
processor.
If
you
use
an
external
processor,
the
Dolby
switch
when
depressed,
will
decode
an
encoded
program.
If
the
Dolby
button
is
depressed
without
an
external
proc-
essor
connected,
you
will
get
zero
output
from
your
speaker
system.
STEREO NOISE FILTER SWITCH
Stereophonic
FM
broadcasts
require
greater
signal
strength
at
the
antenna
terminals
(as
compared
to
monophonic
FM
broadcasts).
Weak
or
distant
stereo
signals
will
naturally
contain
more
noise
than
a
mono-
phonic
signal
of
similar
strength.
The
Citation
Fifteen
STEREO
NOISE
FILTER
will
reduce
or
eliminate
this
undesirable
noise.
In
the
“OUT”
position,
the
switch
has
no
effect.
Filtering
is
provided
in
the
“IN”
position,
MUTE SWITCH
The
MUTE
circuit
reduces
the
audible
noise
(hissing
or
rushing
sound)
found
between
stations.
To
eliminate
interstation
noise,
push
the
MUTE
Switch
“IN”.
To
defeat
the
circuii,
push
the
switch
again.
It
will
return
to
the
“OUT”
position.
MUTING THRESHOLD CONTROL
This
rear
panel
control
adjusts
the
level
at
which
muting
action
will
take
place.
Minimum
muting
action
occurs
in
the
full
counterclock-
wise
position.
Maximum
muting
is
achieved
in
the
full
clockwise
position.
The
full
clockwise
position
will
also
eliminate
stations
with
poor
transmission
quality.
The
control
should
be
adjusted
to
the
point
where
you
receive
only
those
stations
which
meet
your
standards
of
broadcast
quality.
LEVEL SET TONE SWITCH
The
LEVEL
SET
TONE
switch
on
the
front
panel
activates
a
gen-
erator
which
produces
a
sine
wave
test
tone
of
400
Hz
at
a
level
equivalent
to
50%
of
full
modulation
of
an
FM
signal.
“Off-the-air”
tape
recordings
can
be
made
with
complete
assurance
of
correct
levels
by
using
the
test
tone
as
a
recording
level
reference.
After
activating
the
LEVEL
SET
TONE
adjust
the
record
level
con-
trols
of
your
tape
recorder
so
the
record
level
meters
or
other
indi-
cators
on
your
tape
recorder
register
a
level
of
“0”
VU.
At
this
setting
recordings
can
be
made
with
optimum
signal-to-noise
ratio
and
the
distribution
of
dynamic
level
changes
in
music
will
be
properly
captured.
Recorders
vary
in
the
saturation
and
overload
characteristics
of
their
record
amplifiers
which
affect
the
occurrence
of
distortion
in
the
recording
process.
You
may
find
with
your
recorder
that
with
the
“0”
VU
setting
of
the
record
indicators,
the
reference
tone
is
too
high.
While
signal-to-noise
ratio
is
usually
optimum
at
the
“0”
VU
setting,
signal
vs.
distortion
typically
improves
at
lower
recording
levels
(down
to
—8
VU).
With
some
experience
you
will
find
a
recording
level
within
these
values
that
provides
a
combination
of
high
signal-to-
noise
ratio
and
low
distortion
that
is
right
for
you
and
your
recorder.
Because
of
the
variation
of
levels
required
by
different
tape
re-
corders,
it
is
advisable
to
experiment
with
the
record
level
controls
on
your
recorder.
However,
once
this
level
is
determined
it
can
re-
main
constant.
DIAL SCALE
The DIAL SCALE consists of a large drum which rotates in con-
junction
with
the
knurled
flywheel.
The
DIAL
SCALE
is
calibrated
with
an
FM
frequency
scale
(88-108
mHz)
and
a
logging
scale
{0-10}.
Most
FM
stations
operate
at
frequencies
which
are
not
whole
numbers
(such
as
96.3
mHz)
as
compared
to
96
mHz.
Ideally,
each
megacycle
division
on
the
frequency
scale
should
be
divided
into
10
parts
to
enable
the
user
to
pinpoint
the
location
of
the
station.
This
would
require
a
dial
scale
which
would
be
impractical.
The
logging
scale
which
is
divided
into
100
equal
parts
provides
a
means
of
finding
your
favorite
station,
once
you
have
noted
its
position
on
the
logging
scale.
For
example,
in
New
York
City,
WQXR

operates at 96.3 mHz. After locating this station through the use of
the frequency scale (between 96 and 98 mMz) the pointer may fall
on 42 on the logging scale. Make a note of this setting. For future
tuning to WQXR simply set the pointer to 42 on the logging scale.
TUNING METER
All FM broadcast stations are assigned a frequency by the Federal
Communications Commission. The signals from these stations extend
equally above (+) and below (—) the assigned frequency. The fre-
quency spectrum is called the “pass band”’.
The tuning meter of the Citation Fifteen (when centered) is tuned
to the exact center of the pass band. However, you may be detuned
slightly (either + or —) and still not experience degradation of the
quality of sound by remaining within the limits of the pass band. Only
when detuned enough to reach the edge of the pass band will the
signal become noisy, distorted and finally disappear.
It is important to note that it is NOT ALWAYS NECESSARY to
be tuned to the EXACT center of an assigned pass band to obtain
clean, undistorted sound.
QUIETING METER
“Quieting” is a term used in the measurement of the relative signal-
to-noise ratio of a broadcast signal.
Conventional signal strength or center channel meters do not in-
dicate the quality of the received signal — simply their strength and
pass band accuracy. Harman/Kardon’s extraordinary QUIETING
METER actually indicates or ‘reads’ the signal-to-noise ratio or
the QUALITY of the received signal.
Maximum deflection of this meter (highest number) represents the
best listening point within the pass band EVEN IF THE TUNING
METER IS NOT AT THE CENTER OF THE PASS BAND.
As you detune closer to the edge of a station’s pass band, the
QUIETING METER will immediately reflect the increased noise and
distortion.
The QUIETING METER will “ALWAYS” agree with what you hear
and will “ALWAYS” indicate the best tuning point.
10
The
preceding
paragraphs
provide
a
basic
and
concise
description
of
the
function
and
operation
of
the
controls
and
indicators
of
the
Citation
Fifteen.
They
have
been
described
under
what
are
considered
‘normal’
operating
conditions.
However,
abnormal
conditions
sometimes
do
occur
and
could pose
some
special
problems.
The
following
material
deals
with
some
key
problems
which
could
arise
under
“abnorma!”
conditions
and
the
methods
which
can
be
employed
to
solve
them.
PWIETING
ANTENNA ORIENTATION
If
your
antenna
system
uses.
a
rotation
device,
the
best
antenna
orientation
will
be
achieved
when
the
QUIETING
METER
indicates
the
greatest
steady
deflection
(highest
number).
Rotate
the
antenna
in
the
general
direction
of
the
transmitting
station’s
antenna
and
consult
the
QUIETING
METER
to
make
fine
adjustments
of
the
antenna’s
position.
MULTIPATH
“Multipath”
is
a
form
of
audible
distortion
caused
when
a
signal
and
its
echoes
reach
a
receiver
a
fraction
of
a
second
apart.
(Similar
io
“ghosts”
on
your
TV
screen).
Such
distortion
can
be
caused
by
high
rise
buildings,
airplanes,
water
towers,
mountains,
etc.
Con-
ventional
signal
strength
tuning
meters
are
unable
to
provide
guidance
to
reduce
such
interference.
However, since multipath signals always increase background noise,
the
QUIETING
METER
may
be
used
to
tune
both
the
Citation
Fifteen
and
your
antenna
to
eliminate
or
drastically
reduce
multipath
inter-
ference.

TUNING WEAK STATIONS
When
using
the
MUTE
function
of
the
Citation
Fifteen,
most
sta-
tions
received
will
be
relatively
strong
and
have
good
signal-to-noise
ratio.
However,
when
a
“weaker”
station
is
immediately
adjacent
to
a
“stronger”
station,
it
may
be
difficult
to
tune
in
the
weaker
station
with
clarity.
In
such
situations,
the
stronger
station
may
mix
with
or
mask
the
weaker
station
even
though
the
tuning
meter
indicates
that
you
are
precisely
tuned
to
the
weaker
station.
Under
such
circum-
stances,
you
can
achieve
the
best
possible
signal
quality
from
the
11
weaker
station
by
using
the
QUIETING
METER
to
tune
away
from
the stronger station while remaining within the pass band of the
weaker
station.
.
TUNING MECHANISM
The
Citation
Fifteen
does
not
employ
a
conventional
tuning
knob.
Instead,
a
solid,
knurled
flywheel
is
mounted
horizontally
for
precise,
smooth
and
accurate
tuning.
The
flywheel
is
carefully
designed
for
easy
access
and
for
extraordinarily
smooth
and
efficient
changing
of
stations.