am fm car radio antenna trimmer

[dudley]

does anyone out there know if there is still a way to trim the
antenna
to the car radio?. I know that i'm showing my age with this
statement, but i'm having trouble with the fm stations fading in and
out as i travel down the road.i thought that there should be a trimmer
somewhere on the radio to tune the stations in stronger. its been a
long time since i have worked on radios ,so maybe there is not a way
to do it anymore. i have a 95 jeep
with am/fm and they both drift in and out.changed the antenna --no
help
so if anyone out there has an idea i would like to hear from you.
thanks dudley

 

[Charles Schuler]

"dudley" <ralpht@papower.net> wrote in message
news:1174956863.610472.39210@l77g2000hsb.googlegroups.com...

does anyone out there know if there is still a way to trim the
antenna
to the car radio?. I know that i'm showing my age with this
statement, but i'm having trouble with the fm stations fading in and
out as i travel down the road.i thought that there should be a trimmer
somewhere on the radio to tune the stations in stronger. its been a
long time since i have worked on radios ,so maybe there is not a way
to do it anymore. i have a 95 jeep
with am/fm and they both drift in and out.changed the antenna --no
help
so if anyone out there has an idea i would like to hear from you.

My guess is that the radio is acting up.

 

[g]

Charles Schuler wrote:

"dudley" <ralpht@papower.net> wrote in message
news:1174956863.610472.39210@l77g2000hsb.googlegroups.com...
does anyone out there know if there is still a way to trim the
antenna
to the car radio?.
My guess is that the radio is acting up.

My guess is that the FM antenna/radio may be working normally. AM radios
used to have a trimmer associated with the high ipmedance/low resistance
(very short compared to AM wavelength) antenna. FM antennas are at or
near a quarter wave and probably don't have any trimming as the real
part of their impedance is pretty large and matching is a bit easier.

Also, it is common for signals to vary with position as fast as once per
half/wavelength of distance, which may describe what you are experiencing.

How about comparing with the operation of other FM/antennas moving
through the same region, is yours working significantly differently from
others?
g

 

[Charles Schuler]

"g" <wh@t.me.worry> wrote in message
news:46098bc8$0$14129$742ec2ed@news.sonic.net...

Charles Schuler wrote:
"dudley" <ralpht@papower.net> wrote in message
news:1174956863.610472.39210@l77g2000hsb.googlegroups.com...
does anyone out there know if there is still a way to trim the
antenna
to the car radio?.
My guess is that the radio is acting up.

My guess is that the FM antenna/radio may be working normally.

A snip from the original post: "am/fm and they both drift in and out"

 

[Boris Mohar]

On 26 Mar 2007 17:54:23 -0700, "dudley" <ralpht@papower.net> wrote:

does anyone out there know if there is still a way to trim the
antenna
to the car radio?. I know that i'm showing my age with this
statement, but i'm having trouble with the fm stations fading in and
out as i travel down the road.i thought that there should be a trimmer
somewhere on the radio to tune the stations in stronger. its been a
long time since i have worked on radios ,so maybe there is not a way
to do it anymore. i have a 95 jeep
with am/fm and they both drift in and out.changed the antenna --no
help
so if anyone out there has an idea i would like to hear from you.
thanks dudley

It has been a while. For AM there should be a trimmer hole somewhere close
to where the antenna cable enters the radio. The trick is to tune the radio
to a very weak station at low end of the band, somewhere between 550 and 600
KHz. Adjust the trimmer to best reception for that.

--

Boris Mohar



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