.
:~~;'
.:~'~
~
-•..
,;.i
. '(:between the alternator and regulator field terminals. the field terminal
(5) IGNITION COI L PRIMARY: Install O.lpF
coaxial capacitar (Sprague 48P 9 or equivalent) in C. MARINE INSTALLATION
'-
the lead from ignition switch to coil. Keep the The antenna system for a boat requires: a ground
'capacitor close to the coil terminals. Clean the
plane antenna. The common name for such an antenna
metal around the coil mounting bracket to engine
is "coaxial ground plane antenna".
block, apply grease, and retighten mounting screws. The same bonding and ignition suppression tech-
(6) REGULATOR FIELO TERMINAL: Connect
niques must be applied to a boat as to an automobile.
a 39 ohm resistor in series with a O.OlpF ceramic
In many cases a boat requires more work because the
capacitor between the field terminal and ground.
. (7) REGULATOR ARMATURE TERMINAL: Con- engine compartment is of wood, while anautomobile
has a metal hood and firewall to shield theengine. A
nect a 0.Q.2pF coaxial capacitor (Sprague 48P 18 boat's wooden engine compartment requires copper mesh
or equivaleñt).
shielding that is adequately connected to a bonded elec-
(8) REGULATOR BATTERY TERMINAL: Con-
v ~.. trical system.
nect a 0.02pF coaxial capacitor (Sprague 48P 18
i'
f
Bonding a boat requires that electrical and metal
or equ ivalent).
(9) GAUGES: Install 0.5pF 200V capacitors from
terminals to ground.
(10) WHEELS ANO TIRES: Inject special graphite engine.
by the The
use ofpropeller
a wiper.shaft
Thecanwiperand
be bonded all to
other
the fittings
engine
can be bonded
fittings to the engineandusing
be interconnected thentwo-inch-wide
connected to copperthe .
powder (available at automobile parts suppliers) strips. The engine should then be connected to a hull
into the tires.
bottom ground plate or ground tube, again usiog the
CAUTION: Do not connect any capacitor alone from
same copper strip.
CRYST ALS
The Federal Communications Commission has as- Crystals may normally be ordered by simply giving
signed three. different bands of frequencies for use as the channel frequency. In order to determine the crystal
Public Safety two-way radio communications channels. frequency, the following formulas should be used:
The Low VHF band covers from 30.0 to 50.0 MHz LOW VHF
(megahertz), the High VHF band from 150.0 to 174.0 CRYSTAL 3RD OVERTONE FREOUENCY
MHz, and the UHF band from 450.0 to 520.0 MHz. Both CJ-1ANNEL FREOUENCY + 10.7 MHz
public and private agencies, such as poi ice, ambulance, HIGH VHF
fire, lifeguard, Red Cross, and Forest Service, are assigned CRYSTAL 3RD OVERTONE FREOUENCY
specific frequencies within these bands. The frequencies (CHANNEL FREOUENCY - 10.7 MHz)/3
will differ in each town or city. Your local dealer or UHF
town hall can tell you the frequencies being used in CRYSTAL 3RD OVERTONE FREOUENCY
your area. (CHANNEL FREOUENCY - 10.7 MHz)/9
For greatest sensitivity, your 4353 is suppl ied from
In .special cases where interference is encountered
the factory preal igned for best performance in the most
from strong adjacent stations, the formula should be
active portions of the three bands. Signals in other
changed by substituting a positive sign (+) for the nega-
portions of the bands may still be received with slightly
tive sign (-), or vice versa. These crystals are avai lable
less sensitivity. It. desired, your dealer can modify the on special order.
tuning to optimize performance for other frequencies.
REMEMBER: When ordering crystals- from your dealer,
The bands and the parts changes required are as follows:
always give Craig Model Number 4353,
Lo VHF the channel frequency, and the crystal fre-
Covers from 30.0 to 50.0 MHz without any change. quency, and specify crystal holder CR 25/U.
FREQUENCV
156-164MHz
150-158MHz
166-174MHz
Hi VHF 5pFI
C316
10pF 5pF 12pF
10pFi 17pF! 12pFll0pF
17pF\12pF
TVPE C331 I C321I C3231C330 INSTALLlNG CRYSTALS
H2RANGE H1
H3 8pF 8PFI15PFI15PFI12PF
1. Remove the cover of the crystal compartment.
2. Install the crystals in the sockets according
to the desired channel assignments. Using the label pro-
UHF 500-520MHz 112pF
490-510MHz
450-470MHz 10pF
lOpF
vided, write in the respective frequencies.
U1 U4
U2
U3 RANGE
TVPE i FREQUENCV r C423
470-490MHz 112PF
• Supplied Iram the lactary pretuned lar this range.
fII
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