Car cradle makes noise in my fm transmitter

BraX · 06-27-06, 01:08 PM

Hi,

I've been using for a few months a akron 720 car cradle with my x51v.
Very nice cradle.

I just got an fm transmitter powered from usb, the akron 720 provides a free usb powering plug...

If I don't connect the x51v to the cradle powering source, I get a very good sound quality.
When connnected to the cradle, the sound gets noisy and I can hear some high frequency sounds which get higher with my car motor rpms.

Is there any simple way to 'denoise' the x51v power alimentation ?

Thanks

sbddude · 06-27-06, 03:13 PM

I have the same problem with my car charger. What FM transmitter are you using?

SkyRydr · 06-27-06, 03:25 PM

I have the same problem with mine, but only when I have my Axim plugged into the power supply.

If I'm running on battery only, then there is no noise.

06-27-06, 03:47 PM

This "Humm" you guys are hearing is the alternator whine of your car supplying power to the mount (hence the higher sound at higher rpms). You'll need a noise reducer or Ground loop isolator...something like this.

mikelspikel · 06-27-06, 04:02 PM

I solved a similar problem with my FM transmitter by installing a ground loop isolator between Axim's jack and FM transmitter's input.

I think the problem is caused by two different ground signals reaching the Axim at the same time: One in the cradle and another one in the jack.

BraX · 06-27-06, 04:50 PM

Thx for answering guys

I have a service car from my job, I change quite often, it seems mikelspikel & Truth's solution is easy to use.

Where can I buy such a 'ground loop isolator' ?

PS : I'm living in France, Truth's linked shop doesn't ship international

Thanks

ericem · 06-27-06, 10:22 PM

you check ebay?

mikelspikel · 06-28-06, 09:40 AM

Originally Posted by BraX

Thx for answering guys

I have a service car from my job, I change quite often, it seems mikelspikel & Truth's solution is easy to use.

Where can I buy such a 'ground loop isolator' ?

PS : I'm living in France, Truth's linked shop doesn't ship international

Thanks

I think a ground loop isolator is a quite common device easily found in car audio stores.

BraX · 06-30-06, 01:07 PM

Thanks!

On holidays for 2 weeks, gonna go shopping !