Electra Bearcat BC3-L User manual

GENERAT
DESCRIPTION
The Bearcat
III is a tableandmotile model,single
or dual
band FM monitor rectiver providingautomaticscanning
of B
channelsin one or two of the three Public Safety/Business
Bandsat 30-50mHz,
L4,6L74mHz
and450-47OmHz-
Its features
include: provisions
for one or two plug-in
r-f modules;B plug-in crystalsin any combination may be
used; high speed automatic or manual scanning;channel
switchesto omit scanning
of undesired
channels;solid state
Iight Emitting Dode channel
indicators;
comtination squelch
arrd sensitivity control; front-mounted 3" x 5" speaker;
externalspeaker
jack; cables
for ll7Yac or l2Vdc operation;
and operation from a singfe tele*oflng c oqtjde antenna.
The most advanced developments in solid state circuitry
are incorporated in this receiver; dud-gate \lOS Field Effect
r-f and mixer transistors provide low ncise and low cro$s-
modulation. Single conversisr into monolithic guartz crystal
i-f filters reduces spurious responses and radiation and
improves selectivity; linear inteEated circuits provide i-f
gri;, detection, audio amplification and output; TTL I'C'
multivibrators and gatesprovide scanning logic; desired chan-
nels are scanned with no time lost scanning unwanted
channels.
SPECI
FICATIONS
Size:9"W x 35/B"H x 61iB"D
Weight:
5lbs.
Cabinet: Heavyduty vinyl-clad
steel. Non-sliding
feet.
PowerRequirements:
ll7 Vac,l2 W;
l3.B
Vdc,6
W-
Audio Output: 3 W rms, voice (Powerprotectedat 1.5 W on continuous
tones).External
speaker
connector
provided.
Antenna: Telescoping
antenna
(supplied). Connector
providedfor outside
or mobileantenna
Input lmpedance:
50-;0 ohrn-..
Sensitivity: H and L bands: readableat .25 microvolt for t 5 kHz
deviation, .7 microvolt for 20 dB signal-to-noise
ratio: U band slightly less'
Channels: Up to B crystal-controlled channels (in
be scanned iutomatically or selected individually
Frequency Range:
f,ow band *30-50 mHz, total spread15 mHz.
High band xl46-L74 mHz, total spread 24 mHz.
UHF band 450-470 mtJLz,total spread 20 mHz-
(*Factory-supplied alignment f9t [,ott band is 3348 mFrz. High band is
supplied'with' 150-f74 mHz alignment. Other alignments
are available
on
specialrequest.)
Scan
Rate: Approximately
25channels
per
second.
Crystals: Miniature
plug-in
type HC-25/U
for easyuserinstallation.
AccessoriesSupplied: All-band telescoping
antenna
/ Universal
mo^bile
mount-
ing bracket I iI7 Vac power cable/ t3.g Vdg pgwe_t_9ahl_e-(Connects
to
"ficcessorv"or "Radio" ?useblock. FOR USE
WITH NEGATIVE GROUND
SYSTEMS
ONLY).
Front PanelFeatures: Squelch
control / Volume on-off corrtrol / Combined
Manual-Scan
ChannelSelect Switch / B channelswitches
/ B Light Emitting
Dode channel
indicators
/ Forward-facing
3" x 5" speaker.
Usted by Underwriters'
Laboratories,
Inc.
Certified
under FCC Reg.
Part 15.
one or two bands) -aY
or in any combination.
-2-

INSTALLATION
INSTRUCTIONS
This receiver is shipped complete with the necessary
accessoriesfor mobile or table use. fu a fixed receiver
in areas of fair-to-good rip"l strength, the telescoping
whipantenna
supplied,maybeused
on all bands.
If an outsideantenna
is necessary
for fringe reception.
you may use a l55mHz antenna on all bands.
a 40mHz
antenna for L and L/H models or a 4.6&nHz antenna on
U models only. External antennas
should be coupled to
the receiverby 50 ohm coaxial cable,zuch as RG-58 A/U,
using the supplied automotive type connector. Suitable
antennasare
available
at mostradiodealers.
MOBI
LE INSTALLATI ON
This receivermav be installed in anv car. truck. boat. etc..
having
a l2 \-OLT \EG {TI\E GROU\D SY-ITE\I.
In some areas it is illegal for unauthorized persons to
receivepolice communications on a mobile receiver. The user
of this radio is responsible
for obtainingany necessary
author-
ization throuch local agent-ie5
ap6lElectra
Conrpanr cannot
beresponsible
for anv illrgal installation
or usage.
l. Plaee
the motile mounting bracket under the dash
to
hold the receiverin the desiredposition.
2. \lark and drill two holes using a 7164 drill bit and
:H: the bracket with the two No. 6 self-tapping
3. Insert the two plastic "T" washers, flanges turned
inrt-ard, in the desired pair of mounting holes and
secure the receiver in place with the two ll4-20 bolts
and two U4" ID x 9116" OD flat washers.
4. Attach the DC power cable and connect it to the
"accessory" or "radio" terminal on the fuse block.
5. External mobile antennas may be used as described
above. The automotive antenna may be used fully
extended for L, H or L/H models. It should be re-
duced to approximately 18" for U models.
The noise generatedby the auto electrical system and
other partsof the caris sometimes
a problem,particularly in
areas
of low signalstrength. The subjectof noiseelimination
is too lengthyto dealwith adequately in thisinstruction book.
It is recommendedfor those who wish
to become
familiar
with the subjectto purchase
"The RadioAmateur's
Hand-
book" or "The Mobile Manual" publishedby the American
Radio Relay[,eagueandsold by most electronicpartsstores.
It is further recommendedthat the vehiclebe taken to a ser-
vice center which specializes
in VHF-UHF two way radio
communications
equipmentfor correction
of a
noiseproblem.
OPERATI
ON
l. \\ith the porter cableandantennaproperly
connected,
turn the receiverO\ by rotating the "VOLUME"
conrol clockwise.
Place
the B channel
switchesin the up (ON) position.
Set the "\IA\UAL-SCA\" switch on "MANUAL".
Adjust the "SQUELCH" control clockwiseuntil the
rushing
noiseis heard. Then adjust
the "SQUELCH"
control counterclockwise
until the rushingnoise dis-
apPears.
Press
the "MANUAL-SCAN" switch downward and
continue to step through all channels. If the noise
should "break the squelch" on any channel,adjust
the squelch control counterclockwise
again slightly
to quiet the receiver. THIS MUST BE DONE BE-
TWEENSTATION TRANSMISSIONS.
The "MANUAL-SCAN" switch may now be used
to select
andmonitoranydesired
channel.
To sample
all channels
automatically,
returnthe"MAN-
UAL-SCAN" switch to "SCAN". Any channelmay
beomittedas
desired
by moving
theindividual
channel
switchdownward(offl.
2.
6.
7.
-3-

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
tll
TODUL
E
I
I
RFloDuLE'B'
l(on
eorror trDE
cnvsrrue
I
\
roDuLE
I
nF toouLE 't'
-4-

ALIGNMENT
I-F SECTION
Alignment of the I-F system consistsof optimizing the input and output networls
and balancingthe detector output. The bandpassand center frequencyare established
by quartz crystal filters and "peaki.g" the coils can result
in bandpass ripple or poor sensi-
tivity. Field
alignment
should
rot be
necesqan-
but theprocedure
isgiven
for general
information.
EOUIPMENT
NEEDED
Oscilloscope
Sweepgenerator
with 10.79,
10.80
and
l0.BlmHz markers
l. Connect
sweep
generator
to TP-l througha lpf capacitor.
2. Connect
oscilloscope
to TP-2.
3. Maintain
output of tO.BmHz
sweepgenerator
at a low level
to preventdistortion from overloading.
4. Adjust Tf and T2 for maximum output, and minimum
ripple. SeeFigure 2.
to.8l
Figure
2Figure
3
Connect
scope
to ;in TP-2 andadjustT3 so that l0.BmHz
is in center of discriminator
curve and for bestlinearitv.
Seeligure 3.
-{LTER\ATE METHOD: I-F alignment may be checked using a Measurements
\lodel 800 Generatoror equivalent tuned to an operating frequency and swept
+25kc. \larkers are not essential
sinceeenter frequencyis determinedby the filter.
R_F SECTION
DO NOT ATTEMPT ALIGNMENT OR "PEAKING'' OF R-F MODULES.
The R-F alignment
points areadjusted
and sealed
at the factory and shouldnot be
disturbed. Factoryalignment
involves
multi-frequency
signal
generation
systems,add-on
test modules,
output indicators
andtraining
beyond
thescope
of normalserviceactivities.
TheuniqueR-F systeminclurles
electronic
tracking
of R-F andoscillatorcircuits
for
maximum
performance
over
a widerange
of frequencies.
THISPERFORMANCE
CANBE
DESTROYED
BY AN ATTEMPT
TO "PEAK UP''OR "TWEAK'' OR"OPTIMIZE'. ETC.
lo.8
-D-

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Top
View
-8-
UHFBAND
3UMODULE
Top
View

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tI
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103
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203
20,1
303
30+
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306
VOLTAGE CHART
'l'he
\'oltageOhart
may [rt'usetl
asan approximate
guide
in followingcircuit operationorl<xratinga
delet:tive
stage. You shoultl be familiar with the t:ntire manual bel'ore
attempting measuremt:nLs.
GND
G\I)
GND
GNT)
0
r0.2
4.01.9
(;NI)
lr.0
:i.0
7.-1,
1.9
.(r
9.6
1.9
6.9
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202
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.Jt)l
rf.2
r0.2
r0.2
|0.2
10.:J
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0
0
0
0
o
o
Voltages are measured
ntanual position. "\'olunre
".itluelt'
lt'' counterclockn'ise
rvith "\lanual-Scan" switch in
" t'ontr<llcourttert'lockw-ise
anrl
e\cept:
Stluelch
con
trol C\\'/CC\l'
Scanning/\lanual
Crystaloperating
on A/B side
LOGICCHART
The logic sequence
for counting
is shown by "0" under
.5vand
"l" over4v. I.C.-4,pins
B& 9 (*) changestateon
each
mov€ment,
up or down,of the"Manual-Scan"
Switch.
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t
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{l

SERVICING
It is recommendedthat servicingof thisreceiverbedone
by the factoryservice
center.Special
equipment
andskills
are
maintainedat the factory to give
fastandefficientservice on
allof ourproducts.
When returning radio receiversto the factory for service,
include crystals, ac and dc power cables and telescoping
antenna. Disconnect cablesand antenna,
pack carefully and
include a brief. detailed description of the difficulty )'ou are
having.
The receiver circuitry is designed to utilize the best
features of four types of semiconductors: rectifier diodes,
conventional bi-polar transistors, insulated-gate field-effect
transistors and integrated circuits. Servicing should not be
attempted by anyone who is not familiar with the manu-
facfurer's recommendations
and cautions relating to each of
these
devices. The useof ohmmeters
is particularly hazardous
since they can deliver voltagesand currents large enough to
damagesemicon
ductors.
SERVICE
PARTSLIST
(pRrcES
SUBJECT'l'OCHANGE
WTTTTOUT
NOTICE)
MAIN
BOARD
Ref. No. Resistors, t/+WlOTo List Price
Unusual circuitry in this receiver includes the automatic
tuning system in the o'f," and "H" modules. I.C.-101,
I.C.-201 and the associated
circuits generate
tuning voltages
to track the antenna, r-f and oscillator circuits aschannels
are
scanned. The "U" is broadbanded
in a more conventional
manner. Also, when the "Ll' module is operating, the antenna
loading coil [,-1 is switched into the telescopingantenna
circuit.
Audio output power is measured with bursts of modula-
tion or by measuring the maximum excursion on voice
modulation asshown on an oscilloscope. When a continuous
tone is received, the output will start at full power and then
decrease
to approximately half power to protect the output
integrated circuit from overload. It will then return to full
po$-er
for voicecommunications.
The LED indicators have a forward voltage drop of about
l.6v at 20ma. Thecurrent shouldnot exceed
50ma. They are
polarized and may be damaged by a high reverse voltage.
When a channel lamp doesnot light, the failure may be either
the lamp or the switching
I.C. If the channel
works,
checkthe
lamp; if not, check the I.C. When groupsof lamps are out,
refer to the logic chart.
Capacitors
.001 mf. 20%
Disc.Cer.............
.01
mf. 20%
DiscCer.................
.O47mf
. GMV Disc.Cer............
.l
mf. GMV Disc.Cer.
3.3pt lO%Disc.Cer.
.02mf. 20%
Disc.Cer................
.22mf
.10% Mylar.
l50pf 20%
Disc.
Cer.
................
25mf
.l0V Lytic..
I00pf 20%
Disc.
Cer.
................
l00mf. 3V Lytic....
500mf. 10V Lytic..
.047mf.Mylar.........
2000mf.20V Lytic..
l00mf. l5V Lytic..
2mf. 35V Lvtic.........
Semi-Conductors List Price
2N3563
F.
C.
......... .75
MPS3393
Mot.
......... .75
2N3640..... .7
5
TrP-29
T.I............ 1.50
I\+ I+8...... .50
rN3+A....... .50
IN524lB
llV 5%............. 1.00
rN400l .50
LM703LN
Nat........... 1.50
SN76643N
or
ULN2I
II A......... 4.00
T,4.-61lC
S.G.S. 5.00
sN-7474.... 2.00
sN-7426.... 1.00
A-259
Light
Emitting
Diode....... 1.50
Inductors
A-219-1
LoadingCoiI.......,......... 1.00
A-218-l RF Choke.. .50
A-205-l RF Choke.. .50
A-218-2
RF Choke.. .50
A-261 .50
B'-217-2I.F.
Coil..... 2.00
B-2O2PowerTransformer.......... 3.00
Miscellaneous
A-135
Crystal
(Frequenciesasrequired)...........
5.00
A-226
Crystal
Fi1ter......... 10.00
8-254"Manual-Scan"Switch..... 2.00
Slide
Switch,
SPDT..... .7b
AntennaConnector
No. 1207.... .7b
AntennaPlug
No. 1200.............. .7
b
Ext.
Speaker
Jack
No. 351
2A..... 1.00
PowerConnectorP3304AB....... 1.00
PowerSocket
5-3304FHTM...... 1.00
DC Cord Assembly... 1.50
AC Cord
Assemblv... 1.50
.50
.50
.50
.50
.50
.50
.50
.50
1.00
.50
1.00
1.00
.50
1.50
1.00
.15
\Iobile
\lounting Kit.................
8-248Speaker
3" x 5" 3.2ohm. 2.00
3.00
A-138-2TelescopingAntenna.... 1.50
8-228 Front Pane1......... l '7
5
C-233
Trim.......... 3.00
C-203WrapAssembly.....'.......... 7.50
A-237AntennaBushing............. .75
Knob RB-I55-840....... .75

SERVICEPARTS
LIST
(Continued)
Resistors.
V+W
l0% List Price List Price
.00
I
mf. 2OTo Disc.
Ccr..............
.0
Imf. 2OTo Disc.Cer.
..............
6.8pf l0% Disc.Cer. ................
56pf l0% Disc.Cer.
.................
Semi-Conductors
3N201r.r. ........... .. 2.50
2N3563
F.C.
.......... .75
2N3640..... .7 5
IN34A....... .50
LM703LN
Nat........... 1.50
Inductors
ts-208-3AntennaCoi1...............
1.00
4'-218-3RF
Choke.. .50
8-208-4
RF
CoiI...... 1.00
,\-218-2RF
Choke.. .50
B-22O-lOsc.
Coil 1.00
B-209-lTrackingCoil..............
1.00
A-218-l
RF
Choke.. .50
Resistors,
V+W.lO%
3.3k........... .25
15k............ .25
22k............ .25
{.7k.......... .25
68k............ .25
100............ .25
33k............ .25
330............ .25
1.5k........... .25
10k............ .25
I
k.............. .25
C;rpacitors
3.3pfl0% Disc. Cer.
............... .50
I.7-6pf
variable...... .75
l5pf l0% Disc.
Cer.
................ .50
22opt 20%
Disc.
Cer.
.............. .50
.00lmf. 2O%Disc. Cer.
.............. .50
.0lmf. 20%Disc.
Cer.
................ .50
l0pf l0% Disc.
Cer.
.......... .50
5pt 5% Disc.Cer. .50
68pf 5%Disc.Cer. .50
27pf lO%Disc. Cer. .50
I5pf l0% Disc.
Cer. .50
l00pf l0% Disc.Cer.
................. .50
47Opf
20%
Disc.Ccr.................. .50
5pf l0% Disc.
Cer.
Semi-Conductors
3N201T.r............ 2.50
2N3563
F.C.
.......... .75
MPS-3393.. .75
Inductors
A-221-lAntcnnaCoil............... .75
4.-218-4RF Choke.. .50
A-221-2RF Coil..... .75
A-218-2RF Chokc.. .50
8-220-2RF Coil...... .75
A-218-l RF Chokc.. .50
A-218-3RF Choke.. .50
.50
.50
.50
.50
Replacement
parts
may be orrlere<l
directll' from:
Electra
co. - P. o. Box 29243- 300 s. count-vLine Rd. - cumberlancl,
Inrl. 46229
Cash
orderfor parts
rvill
beshipped
prepaicl.

RETURN
WARRANTY
DO
NOTABUSE
NBVERREMOVE
CARD
WITHINTO
DAYS
OR
MODIFY
RADIO
A SERIAL
NUMBER
WARRANTY
This receiver is guaranteed to be free from defects in material and workmanship.
We agree to remedy such defect or to fumish a new part in exchange for any part which,
under normal installation, use and service, disclosessuch defect, provided the receiver
is delivered to us, intact, for our examination, with all transportation charges prepaid
to our factory, within one year from the date of sale to the original purchaser, and
provided suchexamination discloses,in our judgment, that it is thus defective.
This warranty does not apply if the receiver has been subjected to misuse, neglect,
accidents, incorrect wiring not our own;improper installation, or to use in violation of
instructions furnished by us, nor to receiversthat have been repaired or altered outside
our factory.
This warranty excludes all oral or other implied warranhes, ild the manufacturer
shall in no event be liable for damages for a breach of warranty in an amount exceeding
the purchase price of the alleged defective equipment.
TOPLACEWARRANTYIN FORCEFILI, OUT ANDRETURN
WARRANTYCARD
MTHrN
TEN(10)DAYSOF
PURCHASE.
ELECTRACOMPANY
DI
VISIO\ OF \,IASCO
CORPOR
\1'I0\
300
East
County
LineRd.,South
Cumberland, Indiana 16229
tNI-201-2
-r2-