Radio interference

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L

Liam

Guest
Just fitted a radio to my Series 3 which works great until I switch on other
things like heater fan, wipers or cooling fan.
When ever any of these are running there is a lot of crackling, this is
mainly when listening to the radio but also a bit when playing tapes.
What can I do to remove the interference?
I did think about one of those filter things that fits to the power supply
to the radio but they seem to be for removing alternator noise, am I right?

Regards

Liam


 
> When ever any of these are running there is a lot of crackling, this is
> mainly when listening to the radio but also a bit when playing tapes.
> What can I do to remove the interference?
> I did think about one of those filter things that fits to the power
supply
> to the radio but they seem to be for removing alternator noise, am I
right?
>



No you got it wrong that's all party political stuff; sounds the same
though.



 
So Liam was, like

> Just fitted a radio to my Series 3 which works great until I switch
> on other things like heater fan, wipers or cooling fan.
> When ever any of these are running there is a lot of crackling, this
> is mainly when listening to the radio but also a bit when playing
> tapes. What can I do to remove the interference?
> I did think about one of those filter things that fits to the power
> supply to the radio but they seem to be for removing alternator
> noise, am I right?
> Regards
>
> Liam

Long time since I did any of this, but IIRC you fit a small capacitor (about
1 microfarad) across each of the components causing the interference - size
of capacitor to be determined by trial and error. As far as I know there is
nothing you can do to "filter" the power supply to the radio - it's the
other components that are causing the problem.

An expert will be along shortly, I am sure.


--

Rich

Nullum Gratuitum Prandium


 
Richard Brookman wrote:

> So Liam was, like
>
>> Just fitted a radio to my Series 3 which works great until I switch
>> on other things like heater fan, wipers or cooling fan.
>> When ever any of these are running there is a lot of crackling, this
>> is mainly when listening to the radio but also a bit when playing
>> tapes. What can I do to remove the interference?
>> I did think about one of those filter things that fits to the power
>> supply to the radio but they seem to be for removing alternator
>> noise, am I right?
>> Regards
>>
>> Liam
>
> Long time since I did any of this, but IIRC you fit a small capacitor
> (about 1 microfarad) across each of the components causing the
> interference - size
> of capacitor to be determined by trial and error. As far as I know there
> is nothing you can do to "filter" the power supply to the radio - it's the
> other components that are causing the problem.
>
> An expert will be along shortly, I am sure.
>
>
Depending where the radio is picking it up, a filter on the radio power
supply may be useful, but it is most likely you will have to attack the
problem at each noise generating motor, although if you get it on tape it
is clearly coming through the power leads as well and you may have to do
both. As Richard says, a small capacitor to earth as close as possible to
each motor is the way to go. There are special coaxial capacitors for the
purpose available from any car radio installer, and probably many auto
electricians.
A contributory problem is that most older Landrovers will provide poor
electromagnetic shielding because the panels are not electrically well
connected, and light bonding cables between the various panels may help.
Another help may be to fit a larger aerial, but if you are remote from the
station you want to listen to, this won't help much unless the one you have
is pretty poor, and will do little about noise coming along the wiring.
 
I'd just give up if I were you. Mine is just the same, and you can't hear it
for the noise most of the time anyway.


--
Larry
Series 3 rust and holes


"Liam" <[email protected]> wrote in message
news:[email protected]...
> Just fitted a radio to my Series 3 which works great until I switch on
other
> things like heater fan, wipers or cooling fan.
> When ever any of these are running there is a lot of crackling, this is
> mainly when listening to the radio but also a bit when playing tapes.
> What can I do to remove the interference?
> I did think about one of those filter things that fits to the power
supply
> to the radio but they seem to be for removing alternator noise, am I
right?
>
> Regards
>
> Liam
>
>


 

"JD" <[email protected]> wrote in message
news:[email protected]...
> Depending where the radio is picking it up, a filter on the radio power
> supply may be useful, but it is most likely you will have to attack the
> problem at each noise generating motor, although if you get it on tape it
> is clearly coming through the power leads as well and you may have to do
> both. As Richard says, a small capacitor to earth as close as possible to
> each motor is the way to go. There are special coaxial capacitors for the
> purpose available from any car radio installer, and probably many auto
> electricians.
> A contributory problem is that most older Landrovers will provide poor
> electromagnetic shielding because the panels are not electrically well
> connected, and light bonding cables between the various panels may help.
> Another help may be to fit a larger aerial, but if you are remote from
> the
> station you want to listen to, this won't help much unless the one you
> have
> is pretty poor, and will do little about noise coming along the wiring.



I think I will give the capacitors a try (one day) its just the wipers and
heater motors that are really bad and the wiring for them is easy to get at.

So the capacitor is connected between the live feed to the motor and earth?

Thanks

Liam


 
JD <[email protected]> wrote in message news:<[email protected]>...
> Richard Brookman wrote:
> >
> > An expert will be along shortly, I am sure.
> >
> >
> Depending where the radio is picking it up, a filter on the radio power
> supply may be useful,

<snip clever stuff>

See, I told you.

Rich
 
So Liam was, like

> > So the capacitor is connected between the live feed to the motor and
> earth?

Yup.

--

Rich

Nullum Gratuitum Prandium


 
Hi Liam,
you don't mention where you are getting the power for the
radio from. You may find that you get less noise if you run directly
off the battery. This way you are reducing the inherent noice that is
already in the system from being picked up.

You may also like to try the suppressed spark plug and HT leads that
you can get these days.

I think with a S3 you will find a lot of little fixes help. Given that
the aluminium body isn't that well "earthed", try running small extra
earth leads between the bonnet and the firewall, and any other large
area panels that are near your radio and its aerial. Don't forget to
do the windscreen (it may already be done-if so clean up the
connections that are already there).

Is also a good idea to check the routing of some of your existing
problem areas (fans etc) and make sure that you don't run your radio
wires along side these "noise sources".

Cheers


Phillip Simpson


On Wed, 27 Oct 2004 17:04:03 GMT, "Liam"
<[email protected]> wrote:

>Just fitted a radio to my Series 3 which works great until I switch on other
>things like heater fan, wipers or cooling fan.
> When ever any of these are running there is a lot of crackling, this is
>mainly when listening to the radio but also a bit when playing tapes.
>What can I do to remove the interference?
> I did think about one of those filter things that fits to the power supply
>to the radio but they seem to be for removing alternator noise, am I right?
>
>Regards
>
>Liam
>

 

"Phillip Simpson" <[email protected]> wrote in message
news:[email protected]...
> Hi Liam,
> you don't mention where you are getting the power for the
> radio from. You may find that you get less noise if you run directly
> off the battery. This way you are reducing the inherent noice that is
> already in the system from being picked up.
>
> You may also like to try the suppressed spark plug and HT leads that
> you can get these days.
>
> I think with a S3 you will find a lot of little fixes help. Given that
> the aluminium body isn't that well "earthed", try running small extra
> earth leads between the bonnet and the firewall, and any other large
> area panels that are near your radio and its aerial. Don't forget to
> do the windscreen (it may already be done-if so clean up the
> connections that are already there).
>
> Is also a good idea to check the routing of some of your existing
> problem areas (fans etc) and make sure that you don't run your radio
> wires along side these "noise sources".
>
> Cheers
>
>
> Phillip Simpson
>
>
The power for the radio come from the same strip of fuses as for all the
switched live circuits, I'll give the direct feed from battery a try as a
few people have suggested this also.
The wires are all bundled together like a bowl of spaghetti, one day I'll
get round to tidying it up.
The first thing I tried was to earth everything together, made no
difference.


Thanks

Liam


 
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