Chrysler Conquest 1988 Service Manual page 14

Voltage
/o,tagel 3z;:ztag,
5. After installation of transmitter, run the engrne at idle. emit ~~
radio waves from the transmitter and make sure that the -:
engine is not affected.
*§TANDING-WAVE RATIO
If an antenna and a cable having different im~pedances are __
connected, the input impedance ZI will vary in accordance with _~-
the length of the cable and the frequency of the transmitter, Y
and the voltage distribution will also vary in accordance with the
location.
high-frequency
lower supply
The ratio between this maximum voltage and minimum~voltage -_
Antenna
is called the standing-wave ratio. It can also
be
represented by
OOY59
the ratio between the impedances of the antenna and the
cable.
.,Ti- T: ,,,_,
_;- d
F
ES
14
INTRODUCTION
ms-
- Precautions before Service
g&
NOTE ON INSTALLATION OF RADIO EQUIPMENT ;;
NlJtJEA.. ~~ &-
The computers of the electronrc control system has been or ?
designed so that external radro waves will not interfere with
their operatron. --II-
*zx :. ., e3
However, If antenna or cable of amateur transceiver-etc. & i z _ ~(~_ E
routed near the computers. It may attect the operationof the
computers, even rf the output ot the transcerver is no more - G
--
than 25W.
-
To protect each at the computers from Interference by
rransmrtter (hum, transcerver, etc.), the follow~ing
should be -: g
observed.
z=z
1. Install the antenna on the. roof or rear bumper.
2. Because radio waves are emtrted from the coaxialUcable of -:y
the antenna, -keep rt 2UU mm (8 in.) away from the --
.\ =~~
I++
computers and the wrnng harness. If the cable must cross ,,
the wrnng harness, route It so that It runs at right angles to 1:;
the wiring harness.
-
3. The antenna and the cable should
be well matched,
and the -,~ =_
standing-wave ratio* should be kept low.
4. A transmitter having a large output should not be installed in -~- ~
--...-. .,
the vehicle.
The amount ot radio waves emitted from the cable increases as ~_~
the standing-wave ratio Increases, and this increases the -
possibilrty of the electronrc components being adversely
affected.