(D.) wrote in message . com...
Hi,
I am beginner .. sorry if some of this seems like stupid question(s):

I have installed a ICom F2010(2020) into my Jeep.
The radio unit itself is installed in the back where the CD changer
was, the antenna cable is a bit too long, so it is stored in a loop.
Control unit is seperated with 8 meter cable from main unit and is
mounted underneath the ashtray (so basically it is sitting above the
gear box).

The antenna is mounted on the roof the car:
A GME 409L (ground independend), mounted on a spring S004

Frequencies used are in the 460Mhz-490Mhz range.

The problems I am experiencing now:
- Whenever the unit is Rx ... I can hear a whisling sound, which is
only audible if I accelerate (there seems to be a relationship to the
RPMs ?)
- If the car is stationary I can Rx ok, once the car is moving (maybe
50 kmh) the Rx is braking up

Is above normal, if not .. any ideas how to fix it ?

I am aware that I should shorten the antenna cable, rather than
looping it.
Could the transmition be causing the whisling noises ?
Is the antenna I am using a piece of s(*^&(^ and should I use a
different one ?
Thanks, D.

Where are you getting the power from? The battery direct, or from a
receptacle?
Sounds like you are getting alternator whine, or ignition noise.
Probably alternator. You can try directly hooking the power direct to
the battery. Both positive and negative wires, "use both + and - fuses
at the battery". Or go to rat shack and buy a noise filter. I think
they still sell them. It's possible to need the filter even with a
direct battery connection in some cases I bet. MK

In article ,
says...
Hi,
I am beginner .. sorry if some of this seems like stupid question(s):

I have installed a ICom F2010(2020) into my Jeep.
The radio unit itself is installed in the back where the CD changer
was, the antenna cable is a bit too long, so it is stored in a loop.
Control unit is seperated with 8 meter cable from main unit and is
mounted underneath the ashtray (so basically it is sitting above the
gear box).

The antenna is mounted on the roof the car:
A GME 409L (ground independend), mounted on a spring S004

Frequencies used are in the 460Mhz-490Mhz range.

The problems I am experiencing now:
- Whenever the unit is Rx ... I can hear a whisling sound, which is
only audible if I accelerate (there seems to be a relationship to the
RPMs ?)
- If the car is stationary I can Rx ok, once the car is moving (maybe
50 kmh) the Rx is braking up

What you're hearing is alternator whine. I'm curious how you hooked up
the power leads. If you did the one through the fuse panel, another to
ground you're going to get noise.

The way you should install amateur radio gear is a positive and negative
lead connected to the battery, being sure to put suitable fuses on both.

I've used this method on half a dozen vehicles over time and never had a
problem. But it's very important to fuse both leads.

In article ,
says...
Hi,
I am beginner .. sorry if some of this seems like stupid question(s):

I have installed a ICom F2010(2020) into my Jeep.
The radio unit itself is installed in the back where the CD changer
was, the antenna cable is a bit too long, so it is stored in a loop.
Control unit is seperated with 8 meter cable from main unit and is
mounted underneath the ashtray (so basically it is sitting above the
gear box).

The antenna is mounted on the roof the car:
A GME 409L (ground independend), mounted on a spring S004

Frequencies used are in the 460Mhz-490Mhz range.

The problems I am experiencing now:
- Whenever the unit is Rx ... I can hear a whisling sound, which is
only audible if I accelerate (there seems to be a relationship to the
RPMs ?)
- If the car is stationary I can Rx ok, once the car is moving (maybe
50 kmh) the Rx is braking up

What you're hearing is alternator whine. I'm curious how you hooked up
the power leads. If you did the one through the fuse panel, another to
ground you're going to get noise.

The way you should install amateur radio gear is a positive and negative
lead connected to the battery, being sure to put suitable fuses on both.

I've used this method on half a dozen vehicles over time and never had a
problem. But it's very important to fuse both leads.

In article ,
Howard wrote:


Sounds a lot like 'alternator whine'. Is your radio hooked directly
to the battery, if not then proceed to make it so (and fuse both
positive and negative leads). If that does nothing, or not enough, to
fix the problem you may wish to consider a DC noise filter. RatShack
carries a couple of them, the 10 amp model is about $16 (pn 270-051).

Even if the radio only draws 10 amps on transmit, I'de get the 20 amp
filter. You'll have less voltage loss that way.

--
Larry Weil
Lake Wobegone, NH

In article ,
Howard wrote:


Sounds a lot like 'alternator whine'. Is your radio hooked directly
to the battery, if not then proceed to make it so (and fuse both
positive and negative leads). If that does nothing, or not enough, to
fix the problem you may wish to consider a DC noise filter. RatShack
carries a couple of them, the 10 amp model is about $16 (pn 270-051).

Even if the radio only draws 10 amps on transmit, I'de get the 20 amp
filter. You'll have less voltage loss that way.

--
Larry Weil
Lake Wobegone, NH

"D." wrote in message
om...
Hi,
I am beginner .. sorry if some of this seems like stupid question(s):

I have installed a ICom F2010(2020) into my Jeep.
The radio unit itself is installed in the back where the CD changer
was, the antenna cable is a bit too long, so it is stored in a loop.
Control unit is seperated with 8 meter cable from main unit and is
mounted underneath the ashtray (so basically it is sitting above the
gear box).

The antenna is mounted on the roof the car:
A GME 409L (ground independend), mounted on a spring S004

Frequencies used are in the 460Mhz-490Mhz range.

The problems I am experiencing now:
- Whenever the unit is Rx ... I can hear a whisling sound, which is
only audible if I accelerate (there seems to be a relationship to the
RPMs ?)
- If the car is stationary I can Rx ok, once the car is moving (maybe
50 kmh) the Rx is braking up

Is above normal, if not .. any ideas how to fix it ?

I am aware that I should shorten the antenna cable, rather than
looping it.
Could the transmition be causing the whisling noises ?
Is the antenna I am using a piece of s(*^&(^ and should I use a
different one ?
Thanks, D.

I had the same problem but with a PRM8010,
On Transmit you could hear an alternator noise, so all i need is a noise
filter?
Where abouts can i get one and how much??

"D." wrote in message
om...
Hi,
I am beginner .. sorry if some of this seems like stupid question(s):

I have installed a ICom F2010(2020) into my Jeep.
The radio unit itself is installed in the back where the CD changer
was, the antenna cable is a bit too long, so it is stored in a loop.
Control unit is seperated with 8 meter cable from main unit and is
mounted underneath the ashtray (so basically it is sitting above the
gear box).

The antenna is mounted on the roof the car:
A GME 409L (ground independend), mounted on a spring S004

Frequencies used are in the 460Mhz-490Mhz range.

The problems I am experiencing now:
- Whenever the unit is Rx ... I can hear a whisling sound, which is
only audible if I accelerate (there seems to be a relationship to the
RPMs ?)
- If the car is stationary I can Rx ok, once the car is moving (maybe
50 kmh) the Rx is braking up

Is above normal, if not .. any ideas how to fix it ?

I am aware that I should shorten the antenna cable, rather than
looping it.
Could the transmition be causing the whisling noises ?
Is the antenna I am using a piece of s(*^&(^ and should I use a
different one ?
Thanks, D.

I had the same problem but with a PRM8010,
On Transmit you could hear an alternator noise, so all i need is a noise
filter?
Where abouts can i get one and how much??

"Jimmy" wrote in message ...

"D." wrote in message
om...
Hi,
I am beginner .. sorry if some of this seems like stupid question(s):

I have installed a ICom F2010(2020) into my Jeep.
The radio unit itself is installed in the back where the CD changer
was, the antenna cable is a bit too long, so it is stored in a loop.
Control unit is seperated with 8 meter cable from main unit and is
mounted underneath the ashtray (so basically it is sitting above the
gear box).

The antenna is mounted on the roof the car:
A GME 409L (ground independend), mounted on a spring S004

Frequencies used are in the 460Mhz-490Mhz range.

The problems I am experiencing now:
- Whenever the unit is Rx ... I can hear a whisling sound, which is
only audible if I accelerate (there seems to be a relationship to the
RPMs ?)
- If the car is stationary I can Rx ok, once the car is moving (maybe
50 kmh) the Rx is braking up

Is above normal, if not .. any ideas how to fix it ?

I am aware that I should shorten the antenna cable, rather than
looping it.
Could the transmition be causing the whisling noises ?
Is the antenna I am using a piece of s(*^&(^ and should I use a
different one ?
Thanks, D.

I had the same problem but with a PRM8010,
On Transmit you could hear an alternator noise, so all i need is a noise
filter?
Where abouts can i get one and how much??


In australia by the way

"Jimmy" wrote in message ...

"D." wrote in message
om...
Hi,
I am beginner .. sorry if some of this seems like stupid question(s):

I have installed a ICom F2010(2020) into my Jeep.
The radio unit itself is installed in the back where the CD changer
was, the antenna cable is a bit too long, so it is stored in a loop.
Control unit is seperated with 8 meter cable from main unit and is
mounted underneath the ashtray (so basically it is sitting above the
gear box).

The antenna is mounted on the roof the car:
A GME 409L (ground independend), mounted on a spring S004

Frequencies used are in the 460Mhz-490Mhz range.

The problems I am experiencing now:
- Whenever the unit is Rx ... I can hear a whisling sound, which is
only audible if I accelerate (there seems to be a relationship to the
RPMs ?)
- If the car is stationary I can Rx ok, once the car is moving (maybe
50 kmh) the Rx is braking up

Is above normal, if not .. any ideas how to fix it ?

I am aware that I should shorten the antenna cable, rather than
looping it.
Could the transmition be causing the whisling noises ?
Is the antenna I am using a piece of s(*^&(^ and should I use a
different one ?
Thanks, D.

I had the same problem but with a PRM8010,
On Transmit you could hear an alternator noise, so all i need is a noise
filter?
Where abouts can i get one and how much??


In australia by the way

Jimmy,
just picked one up from SuperCheapAuto (or something like that) ... there is
one for AUD 10 and one for AUD 30.

Will put it in tomorrow and see how it goes

D.


"Jimmy" wrote in message ...

"D." wrote in message
om...
Hi,
I am beginner .. sorry if some of this seems like stupid question(s):

I have installed a ICom F2010(2020) into my Jeep.
The radio unit itself is installed in the back where the CD changer
was, the antenna cable is a bit too long, so it is stored in a loop.
Control unit is seperated with 8 meter cable from main unit and is
mounted underneath the ashtray (so basically it is sitting above the
gear box).

The antenna is mounted on the roof the car:
A GME 409L (ground independend), mounted on a spring S004

Frequencies used are in the 460Mhz-490Mhz range.

The problems I am experiencing now:
- Whenever the unit is Rx ... I can hear a whisling sound, which is
only audible if I accelerate (there seems to be a relationship to the
RPMs ?)
- If the car is stationary I can Rx ok, once the car is moving (maybe
50 kmh) the Rx is braking up

Is above normal, if not .. any ideas how to fix it ?

I am aware that I should shorten the antenna cable, rather than
looping it.
Could the transmition be causing the whisling noises ?
Is the antenna I am using a piece of s(*^&(^ and should I use a
different one ?
Thanks, D.

I had the same problem but with a PRM8010,
On Transmit you could hear an alternator noise, so all i need is a noise
filter?
Where abouts can i get one and how much??