Realistic PRO-2001 Owner's Manual page 12

M o b i l e A n t e n n a
There are many possible mounting locations on a car. Three
most popular locations for monitor antennas are shown below.
MOBI LE NOISE SUPPRESSION
Your PR0-2001 is a very sensitive receiver, and will pick up even
e x t r e m e l y w e a k s i g n a l s . T h i s m e a n s t h a t i n a d d i t i o n t o t h e t i n y r a d i o
s i g n a l s , r a d i o - f r e q u e n c y n o i s e m a y a l s o b e p i c k e d u p a n d a m p l i f i e d .
I n a m o b i l e i n s t a l l a t i o n , i t i s i m p o r t a n t t h a t y o u t a k e s t e p s t o r e d u c e
the amount of noise that finds its way into the Receiver. [f you take
some or all of the steps recommended below, your reception should
be quite satisfactory f or mobile applications.
Electrical System :
G e n e r a l l y s p e a k i n g , n o i s e c a n b e g e n e r a t e d b y a n y d e v i c e o r c o n n e c -
tion that carries electrical current. Any device that generates a spark
should also be suspected. Bypass any suspected wire to ground with a
h i g h q u a l i t y 1 p F c o a x i a l c a p a c i t o r .
A very common source of noise is the generator or alternator. This
t y p e o f n o i s e w i l l s o u n d l i k e a m u s i c a l w h i n e , a n d w i l l a l s o v a r y w i t h
s p e e d o f t h e e n g i n e . G e n e r a t o r a n d a l t e r n a t o r n o i s e c a n u s u a l l y b e
reduced by connecting a coaxial-type capacitor from the armature
terminal to the metal case.
lgnition System :
The ignition system is the most common source of noise. This noise
can be identified by the fact that its speed varies with the engine
s p e e d . l g n i t i o n n o i s e w i l l s o u n d l i k e a s e r i e s o f " p o p p i n g " s o u n d s ,
while the engine is idling, and will speed up to a buzzing sound as
engine speed is increased.
There are a number of things that can be done for this type of noise.
1 . U s e r a d i o s u p p r e s s i o n - t y p e i g n i t i o n w i r e a n d r e s i s t o r s p a r k p l u g s .
2. Check high-voltage wiring for leakage, cracks, etc. Replace any old
w i r i n g .
3. In extreme cases, obtain an ignition noise suppression kit-it
s h o u l d s h i e l d a l l i g n i t i o n w i r i n g . T h i s w i l l p r o v i d e m a x i m u m n o i s e
su pp ression.
of the
A convenient and efficient antenna for mobile use is Radio Shack's
V H F - H i / L o U H F - H i / L o N o - H o l e T r u n k M o u n t M o b i l e . 2 0 - 0 1 7 .
Keep the following points in mind
antenna.
1 . M o u n t i t r i g i d l y , s o i t w i l l r e m a i n v e r t i c a l
w h i l e i n m o t i o n .
2. Mount as far as possible from the engine
compartment.
w h e n i n s t a l l i n g y o u r m o b i l e
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