|
|||||||||||||
|
|
|
||||||||||||
|
|
|||||||||||||
|
Syllabus Sections:- Station design and antenna placement / Mobile installations 6F1 46 Recall that advice on mobile installations is the Federation of Communication Services UK Code of Practice for the installation of mobile radio and related ancillary equipment in land based vehicles. When
connecting mobile radio to your car special care must be taken
,the Motor and Vehicle communications industries in 2009
stated that you must connect up the radio power leads via
suitable fuses to the positive terminal to your battery and
use the vehicle chassis to connect the negative lead but
without a fuse. This assumes your vehicle is a negative
chassis type, and in all cases check with any specific
instructions of your vehicle manufacturer . Play special attention to the FCS
(Federation of Communication Services UK Code of Practice)
1362 installation guidance. 6F2 46 Understand how to minimise the likelihood of stray RF currents entering the vehicle wiring and electronics. Cars and other motor vehicles rolling off production lines today are so much more sophisticated than even 2005. Whilst in 2005 and earlier installing a radio transmitter in a car was considered relatively simple that is not the case today.EMC with modern vehicles is an area that must be taken seriously.Any stray RF generated by the radio and any cables carrying RF MUST be kept well away from any car wiring loom or electronic control circuits The modern vehicle has radio controlled systems for locking as just one example - overloading the system with your radio transmissions can cause failure of not only the locking systems but air bags and engine management systems to such an extent that it can cause the vehicle not to function properly or not to function at all. Before trying to install your radio transceiver in your can seek advice from the manufacturer, please also make sure that the radio you are installing is for in-vehicle use .Remember that your vehicle insurance company MAY need to be informed of the installation as if not told your insurance may be invalid ! General safety There are several points to consider:- Installation position of transceiver The transceiver must be installed in such a way that it will not cause injury to persons in the vehicle in the event of an accident or whilst sitting in the vehicle or entering or exiting from the vehicle. Installation position of cables The transceiver must be properly installed so that it does no interfere with the controls of the car nor be a potential fire hazard. The fire hazard is further reduced if both the positive and negative leads are independently fused - and for the fuses to be located as close to the battery as possible. Fuming in the positive lead protects the car in the event of a short circuit to the chassis (assuming negative chassis) and fusing in the negative lead protects the rig in the event that the earth system of the vehicle is faulty and uses the rigs earth to take the full load of the battery negative. Do not use the cigarette lighter or as it is now called the auxiliary electrical supply socket as it is only intended for intermittent use and is unlikely to be fused on both positive and negative leads further it could provide a direct link into the motor vehicles electrical system for RF.. Installation position of speaker Similar to the transceiver but you need to be able to hear the speaker when the car is in motion so consider its location relative to other sounds. Hands free operation Whilst regulation might allow you to talk on a normal microphone it is still dangerous and really operation without a hands free kit is just plain stupid. Next Social issues
|
|||||||||||||
|
|
|||||||||||||
|
|
|||||||||||||
