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Kenwood cd reciever model 241-Sa, fitted by halfords, am receprion very poor, interferance. What do I do? Thanks

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1) The most likely cause of bad AM reception is a bad antenna
or a broken antenna cable, somewhere behind the dash.

Because FM is roughly 100x the frequency of AM, it requires
a much less efficient antenna, and the signal tends to jump over
small wire gaps or breaks.

2) The next likely problem is the reception area. AM is much less penetrating than FM, but it does go around things like
buildings, while FM tends to reflect off of them causing nodal
interference. AM also goes beyond the horizon, FM does not.
FM may work underground and in garages, on the other hand,
and AM may not. AM reflects from the ionosphere and travels
great distances at night, FM does not.

but

AM is much more sensitive to atmospheric noise, electrical
noise, thunder storms, ignition noise ... etc, and AM sound
quality is by design much lower.

3) Make sure that your antenna is rated for both AM and FM,
some are not. Theoretically, a simple antenna needs to
at least 1/4 wavelength long at the receiving frequency.

While this theoretical distance represents around 3 ft at FM
frequencies, it is hundreds of feet for AM. Because such a
large antenna is not practical for cars or portable radios,
other technology is required to make up for this.

3) Many car radios have a tuning capacitor on the back, which
could be mis-adjusted. This capacitor makes the antenna
look much longer, than it actually is in an electrical sense.

4) When you say the radio gets interference, is this cackle
and hiss like a weak station, or are you getting motor
ignition noise, ie. clicks at low RPM ==> annoying
whine at high RPM ?

This would be caused by the car or by poor installation,
not by the radio itself.

How does the radio work with the motor turned off?

5) The radio itself could of course be also defective, because
the AM and FM parts are totally separate and different. This
could be due anything from internal mis-alignment of the
mixer and IF stages, to a cracked circuit board or a bad
chip or transistor.

Martin



Posted on May 22, 2008

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You need to buy a regular car antenna or replace the one you have
but also this model number is not listed in kenwoods mauals i have
please check model number so that i can find your device and give you proper help

Posted on May 09, 2008

Is it a VW AUDI Ford Gallaxy? with the aerial inbeded in the glass or a bee sting on the roof?

You may need a power antenna feed. part# PC5-90

or if your car has a electric aerial is it working?

or is your fixed aerial damaged?

Posted on May 09, 2008

Modern AM reception is usually quite bad. We are used to the high quality sound from other formats and FM, AM has a very compressed frequency range so will always sound poor in comparison. The interference could be due to poor earthing or suppression on the electrical equipment in the car. Usual suspects are ignition, wiper motors and fans. A suppressor between the +V and earth usually help, fitted as close to each device as possible. The devices causing the interference can be pin pointed by turning one electrical item on at a time and seeing if it causes a problem. Another issue is that a lot of modern vehicles use the rear screen demister as an aerial, which can cause bad reception and interference. An external aerial is always best.

Posted on May 09, 2008

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