Resistor in car aerial?

[Dr.Shifty]

my in-dash cd stacker decided to play up and i've had it in and out of
the dash several times recently to rescue misloaded discs. Trouble is, I
have busted the wire in the radio aerial plug so now no radio as well as
no CD.

The radio aerial plug has a small resistor in the signal line. I have to
put in a new plug and would like to know if the resistor is necessary.
What does it do anyway? I've put the thing back in the dash and didn't
take down the resistor colour code so can't say what value it has.

 

[Phil Allison]

"Dr.Shifty"

my in-dash cd stacker decided to play up and i've had it in and out of
the dash several times recently to rescue misloaded discs. Trouble is, I
have busted the wire in the radio aerial plug so now no radio as well as
no CD.

The radio aerial plug has a small resistor in the signal line. I have to
put in a new plug and would like to know if the resistor is necessary.
What does it do anyway? I've put the thing back in the dash and didn't
take down the resistor colour code so can't say what value it has.

** Sure it is a resistor ??

Might easily be a miniature inductor - they look almost identical.

Just ask if you want more info.



............ Phil

 

[Dr.Shifty]

Phil Allison wrote:

"Dr.Shifty"
my in-dash cd stacker decided to play up and i've had it in and out of
the dash several times recently to rescue misloaded discs. Trouble is, I
have busted the wire in the radio aerial plug so now no radio as well as
no CD.

The radio aerial plug has a small resistor in the signal line. I have to
put in a new plug and would like to know if the resistor is necessary.
What does it do anyway? I've put the thing back in the dash and didn't
take down the resistor colour code so can't say what value it has.


** Sure it is a resistor ??

Might easily be a miniature inductor - they look almost identical.

Just ask if you want more info.

........... Phil

That would make some sense to me (who forgets most electronics stuff I learnt
thirty something years ago). This car has an antenna amplifier (the antenna is
wires in the rear window and there is an amp unit in the headlining) so a
resistor didn't make sense to me. I imagine an inductor would smooth out or
trim out unwanted frequencies that the lead picks up.

This one is very miniature, like a yellow grain of rice. So I suppose I should
go out to the car with a screwdriver and get it out so I can check it.....

 

[Dr.Shifty]

"Dr.Shifty" wrote:

Phil Allison wrote:

"Dr.Shifty"
my in-dash cd stacker decided to play up and i've had it in and out of
the dash several times recently to rescue misloaded discs. Trouble is, I
have busted the wire in the radio aerial plug so now no radio as well as
no CD.

The radio aerial plug has a small resistor in the signal line. I have to
put in a new plug and would like to know if the resistor is necessary.
What does it do anyway? I've put the thing back in the dash and didn't
take down the resistor colour code so can't say what value it has.


** Sure it is a resistor ??

Might easily be a miniature inductor - they look almost identical.

Just ask if you want more info.

........... Phil

That would make some sense to me (who forgets most electronics stuff I learnt
thirty something years ago). This car has an antenna amplifier (the antenna is
wires in the rear window and there is an amp unit in the headlining) so a
resistor didn't make sense to me. I imagine an inductor would smooth out or
trim out unwanted frequencies that the lead picks up.

This one is very miniature, like a yellow grain of rice. So I suppose I should
go out to the car with a screwdriver and get it out so I can check it.....

Got it...
The thing is only 3 mm long. The color code is Brown Green Brown Silver Silver. If
it is a resistor my Jaycar chart makes it 1.51 ohms.

It does not show anything on the multimeter, just open circuit. Does it have to be
tested at a certain frequency or something for inductance?

Or do I really need it?

 

[Phil Allison]

"Dr.Shifty" <kkm@tpg.com.au> wrote in message
news:417A4391.28B6D553@tpg.com.au...

"Dr.Shifty" wrote:

Phil Allison wrote:

"Dr.Shifty"
my in-dash cd stacker decided to play up and i've had it in and out
of
the dash several times recently to rescue misloaded discs. Trouble
is, I
have busted the wire in the radio aerial plug so now no radio as well
as
no CD.

The radio aerial plug has a small resistor in the signal line. I have
to
put in a new plug and would like to know if the resistor is
necessary.
What does it do anyway? I've put the thing back in the dash and
didn't
take down the resistor colour code so can't say what value it has.


** Sure it is a resistor ??

Might easily be a miniature inductor - they look almost identical.

Just ask if you want more info.

........... Phil

That would make some sense to me (who forgets most electronics stuff I
learnt
thirty something years ago). This car has an antenna amplifier (the
antenna is
wires in the rear window and there is an amp unit in the headlining) so a
resistor didn't make sense to me. I imagine an inductor would smooth out
or
trim out unwanted frequencies that the lead picks up.

This one is very miniature, like a yellow grain of rice. So I suppose I
should
go out to the car with a screwdriver and get it out so I can check
it.....

Got it...
The thing is only 3 mm long. The color code is Brown Green Brown Silver
Silver. If
it is a resistor my Jaycar chart makes it 1.51 ohms.

It does not show anything on the multimeter, just open circuit. Does it
have to be
tested at a certain frequency or something for inductance?

** Might easily be a 150 pF, tubular ceramic cap.

Need a cap meter to find out.



............. Phil

 

[Leon Gross]

"Phil Allison" <philallison@tpg.com.au> wrote in message
news:2tuv14F23v57aU1@uni-berlin.de...

"Dr.Shifty" <kkm@tpg.com.au> wrote in message
news:417A4391.28B6D553@tpg.com.au...
"Dr.Shifty" wrote:

Phil Allison wrote:

"Dr.Shifty"
my in-dash cd stacker decided to play up and i've had it in and out
of
the dash several times recently to rescue misloaded discs. Trouble
is, I
have busted the wire in the radio aerial plug so now no radio as
well as
no CD.

The radio aerial plug has a small resistor in the signal line. I
have to
put in a new plug and would like to know if the resistor is
necessary.
What does it do anyway? I've put the thing back in the dash and
didn't
take down the resistor colour code so can't say what value it has.


** Sure it is a resistor ??

Might easily be a miniature inductor - they look almost identical.

Just ask if you want more info.

........... Phil

That would make some sense to me (who forgets most electronics stuff I
learnt
thirty something years ago). This car has an antenna amplifier (the
antenna is
wires in the rear window and there is an amp unit in the headlining) so
a
resistor didn't make sense to me. I imagine an inductor would smooth out
or
trim out unwanted frequencies that the lead picks up.

This one is very miniature, like a yellow grain of rice. So I suppose I
should
go out to the car with a screwdriver and get it out so I can check
it.....

Got it...
The thing is only 3 mm long. The color code is Brown Green Brown Silver
Silver. If
it is a resistor my Jaycar chart makes it 1.51 ohms.

It does not show anything on the multimeter, just open circuit. Does it
have to be
tested at a certain frequency or something for inductance?



** Might easily be a 150 pF, tubular ceramic cap.

Need a cap meter to find out.



............ Phil

Phil's right, our Hirschmann car aerial cables all have a capacitor in
series with the internal conductor inside the radio end plug, that is all
cables that are long (in our case 485cm). This was often taken to mean a
faulty cable by the car repairs checking for reception problems and
measuring the cable as of course the capacitor wont pass DC and hence will
measure open circuit as far as a normal resistance multimeter is concerned!
The capacitor is used to match the long cable to the radio tuner. Same value
too from memory.

Leon Gross
Soundlabs Group Pty Ltd
www.soundlabsgroup.com.au