CRYSTAL INSTALLATION
DISCONNECTPOWER
BEFORE
REMOVING
CABINET
LEAVE
POWER
OFFWHILEINSTALLING
CRYSTALS
To remove the catinet, first remove the screw at the
bottom rear edge. Pushthe rear panel forward through the
cabinet. The components and crystal sockets are in full
viewandeasily
accessible.
Ihe three crystal $n socketsat the front are for channel
No. l. The secondrow of 3 ie for channel 2 etc. Each
crystal will be inetdled betrpen the centcr row and sre
outside row. Ihe outdde rows connect to the r-f module
nearest them on the oppodte dde of the boerd. only
one outside row will bc-used wheNronly one r-f module is
used. A total of eight crystals may be used. They may
be inetalledin ary order and in either burd as long aseach
crystal frequency is proper for the particular module to
whichit isconnected.
L, H or U modulesmay be in eitherposition.
Figure I
Remove the crystal by a gentle pull upward. Insert
the crystal by aligningthe pins with the sockets
and pushing
straightdown. DO NOT BEND THE SOCKETS. THESE
MINIATURE SOCKETS
ARE MADE OF SPRING
BRONZE
AND WILL BREAKOFFIF BENTEXCESSIVELY.
NOTE: Do not install two crystalsof the samefrequency.
Rigid quality standards
are applied to crystals
furnished
by Electra Company to assurefull performance,
therefore
our warranty doesnot include correctingpoor operation
causedby crystals
from othersources.
Unless
ordered otherwisethe "U" alignment
spread
is
450mHz to 470mHz, the 6'H)' 150mHz to l7$mHz, and
the "L" 33mHz to 4BmHz. Newfrequencies
may beadded
within these
spreads.
CRYSTALFORMULAS
'6H" Receivedfrequency
- 10.80mHz = crystalfrequency.
3
Example: 155.01
mHz- 10.80
mHz
= 48.07000mHz
"L)) Receivedfrequency
* fdgO -H, = crystalfrequency.
Example: 35.80 mHz+ f0.80 mHz= 46.60000
mHz
6'L:' Reecived frequ€ncv - 10.80 mHz = crystd frequency.
Example: 9
453.250
mllz - 10.80mHz
= 49.16111mHz
9
USER HINTS
Radio equipment usually operates in an environment of
man-made electro-magnetic noise which radiates from power
lines, fluorescent lights, motors, appliances, ignition systems,
etc. Modern.
radiosare designedto minimize interference from
such sourcesbut operation may be affected under conditions
of unusuallv strong noise.
Dstant weah "rhp'' or noise siEralsmay be received by
this receiver because of its high sensitiuity. Whenever such
conditions intemrpt scanningor wheneveravery busy channel
prevents reception of other desired signals, the affected
channel ma,v be bypassed by means of its individual panel
switch.
The squelch control functions in the normal manner and,
in addition, as it is rotated counterclockwise farther, it be-
comes a sensitivity control. By careful setting, it can accept
weak signals or can be adjusted to receive only medium or
strong signals. Interference from weak signals on the same
channel may be reducedin this manner.
In casesof strong interfering noise or signals
it may be
desirable
to reducethe length of the antenna to reducenoise
pickup below a critical lerel. This mar tr ven- effective
in
medium and strong riprl ane:rs.
Single-channel operation may be obtained as described
under Operating Instructions. It may also be accomplished
with the "MANUAL-SCAN" switch in either position by lock-
ing out all but the desired
channel. This assures
that the radio
will always be on that channel even when turned OFF and ON.
Continuous-carrier signals such as the ESSA weather broad-
casts on 162.55mH2, which are availablein many areas,may
be received when desired by use of the individual channel
switches.
ln mobile servicethe commonly encountered poor recep-
tion conditions are signal fading, nearby faulty ignition
systems,power lines and proximity to shong signals. Careful
setting of the squelch control will minimize theseconditions.
When moving or shipping the radio, remove the telescoping
antenna to avoid damageto it or to the internal circuit assem-
blies.
RADIO SERVICES
LocalGovemment Special
Emergency
HighwayMaintenance -Hospitals
Foresty-Consenation -Ambulances
MotionPictures -Physicians
SpecialIndustrial -Disaster
Relief
TelephoneMaintenance -SchoolBusses
AutomobileEmergency Power
PublicMobile Radio Petroleum
Mobile
Telephones Forest
Products
Police
Fire
Press
Business
Railroad
Taxicab
Marine
Manufachrrcrs
Motor Carrier
Rurd Radio
CRY
STALS
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