30
DAILY MCA2014 4x4 ‒ BODYBUILDER INSTRUCTIONS
ELECTRONIC SUB-SYSTEMS
5.4 ELECTRICAL SYSTEM: CURRENT INTERVENTIONS AND DRAWS
– Printed 603.95.994 – 1 Ed. - Base 05/2015
99349
Figure 29
1. Antenna connector
2. Ground wire
3. Insulator
4. Signal wire
5. Condenser (100 pF)
6. Cable RG 58 (characteristic impedance = 50 Ω)
7. Clamp
8. Protection cap
9. Connector (N.C. SO - 239) transreceiver side
10. Test executed sticker
11. The 100 pF condenser must be soldered on the lower pin
and crimped to the ground braid
12. The lower pin must be soldered to the core conductor of
the cable
13. Nut
Some specific instructions are given below for each type of equipment.
Amateur equipment for CB (27 MHz) and 2 m band (144 MHz)
The transmitter part must be installed in a separate area from the vehicle's electrical components; if the transmission is impulsive it
must be at a distance of least one metre away from other devices.
● The ROS value (Stationary Wave Ratio) must be as close as possible to the unit (the recommended value is 1.5), while the
maximum acceptable value must never be greater than 2.
● The ANTENNA GAIN values must be as high as possible and guarantee a sufficient level of spatial uniformity, characterised
by deviations in relation to the average value to the order of 1.5 dB in the typical CB band (26.965-27.405 MHz).
● The IRRADIATED FIELD in cab value must be as low as possible, and however < 1V/m.
In any case, limits set by the applicable European legislation must never be exceeded.
To determine whether the system is functioning well and to check that the antenna is calibrated, it is suggested that the following
information is taken into account:
1. if the ROS (Stationary Wave Ratio) is higher on the lower channels than on the higher ones, the antenna should be
lengthened
2. if the ROS (Stationary Wave Ratio) is higher on the higher channels than on the lower ones, the antenna should be shortened
After having calibrated the antenna, it is advisable to re-check the ROS (Stationary Wave Ratio) value on al the channels.
To Next Page
Loading...
Need help?
General
