Sentra 2001 Antenna

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Bob - 10 Sep 2005 22:32 GMT

Hi

I will explain my problem. I have a FM transmiter for my mp3 player.
Obviously, the transmitter power is really small. So, I would like to
bypass the car factory Antenna and plug my FM transmitter directly onto the
radio car. Is it possible to do? My final objective is to install a switch
so in one position I will be able to receive FM radio station and on the
other position, the factory antenna will be disabled and only my FM
transmitter will work. I think with this method, I will have less noise on
my radio.

I unplug the radio car and try to see wich cable is the antenna but it's
really hard to see. Is it the round connector? It's the only one I see that
can go on the antenna. If I unplug this little cable, the car radio
shutdown immediately. But, on the test I have made, it dont look to have
power.

My car is a Sentra 2001 SE (180 Watt radio).

Thanks in advance.

PS. Excuse my poor english.

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gary - 10 Sep 2005 23:45 GMT

Yes, the round cable is the antenna cable. Nissan usually supplies the
ground through the antenna cable/chassis. Usually a wire from the metal
case of the radio to a real chassis ground will turn it back on.

Unless the transmitter you have has a lower output for direct connection
into a radio, the transmitter can overload/damage the radio. (essentially
burn out the most sensitive part of the receiver).

Gary K

> Hi
>
[quoted text clipped - 20 lines]
>
> PS. Excuse my poor english.

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Bob - 11 Sep 2005 14:53 GMT

Thanks

If I understand you corectly. All the chassis of the car can act as
a Antenna. So, mays be I can try to plug directly my FM transmitter on
the chassis and expect it to work better.

I Think my tranmiter have a really lower output. It's a Lexar LDP-600.
The FM transmiter is incorporate in the device. So I think it should be
the easist and better way to achive my goal.

Another time, thanks.

Roberts

> Yes, the round cable is the antenna cable. Nissan usually supplies
> the ground through the antenna cable/chassis. Usually a wire from the
[quoted text clipped - 32 lines]
>>
>> PS. Excuse my poor english.

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Dave D - 15 Sep 2005 16:28 GMT

> Unless the transmitter you have has a lower output for direct connection
> into a radio, the transmitter can overload/damage the radio. (essentially
> burn out the most sensitive part of the receiver).

That is true. However, it would take a considerable amount of RF energy to
destroy the front end of a receiver, at least tens of times more than these
little FM transmitters can chuck out. They're little more than modulators
with an aerial attached.
They are generally in the milliwatt range, connecting them directly should
not risk any damage.

However, that's not to say that it will work well. Overloading the front end
of the receiver could produce undesirable effects. For that and other
reasons, I wouldn't be too keen on connecting them directly without using a
small value capacitor, say 10pf, or using inductive coupling.

Dave

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