I have just installed my ALPINE CDM9803RM in to my horsebox and it works fine BUT I can't get very good radio reception - even the everyday channels like radio 1,2,4 etc come and go. I have put a brand new aerial on the lorry but still only get intermittent reception as I drive.
Can you help please?
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It is always worth checking the aerial in any case of poor reception.
In the case of a standard mast-type aerial it is necessary for the mast to have very good continuity to the centre of the aerial plug, that the outer part of the aerial plug has good continuity to the aerial ground and thus to the vehicle bodywork and the two parts are electrically isolated from each other. A good independent radio ground connection also helps.
In the case of miniature aerials or those within a windscreen, a rear screen or rear quarter glass, the amount of signal available will be small and so an aerial preamplifier will be provided to boost the signal. The preamp might be part of the aerial or a separate unit fitted anywhere convenient. I once found one fixed to the front firewall behind the dashboard.
The preamp needs a good 12 volt supply and a ground as well as good connections to the aerial coaxial leads. The supply is usually obtained from the radio set so it is operative only when the radio is switched on. Sometimes a radio has a dedicated output but mostly the electric (automatic) aerial output must be used. If the preamp isn't working reception will typically be limited to a few powerful stations.
You can bench test it by hooking up powers and ground to a battery (12 volt) and use a speaker to one set of speaker wires at a time. Even a 12 volt cordless drill battery will work. Should only take a few minutes. You just won't get reception to radio stations without an antennae.
You have the wrong blue wire connected. Your power antenna wire is hooked to the amp remote wire and vice versa. Your radio thinks the tuner is off - and is dropping the signal thru the power antenna wire - and turning off your amplifer. Switch the 2 blue wires in your install - and you'll be all set.
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Your antenna wire could be loose behind the radio because sometime they will have to use an adapter because of the size another thing could be if you have a sirius/xm radio they will send you an adapter to cut down on the static for free also the adapter on the sirius could be loose or bad good luck