Rubbish AM Reception

Post by **lushman** » Tue Dec 16, 2008 12:29 am

Hi, I have terrible AM reception on my RNS D sat nav unit. I listen to Absolute radio (Virgin Radio) daily but recently I have found the reception to be very poor. This has never happend before in any radio that I have had in my car only this one.
Can anyone suggest an idea to cure this? Is it a case of fitting a new ariel that will increase signal strength or am I barking up the wrong tree!

Thanks Paul

Post by **PetrolDave** » Tue Dec 16, 2008 2:34 pm

The RNS-D connects to a diversity antenna system in the car that already has built-in amplifiers. Sounds like maybe one of them has gone faulty.

What's FM reception like?

Is reception any better or worse when you turn the heated rear window on?

Post by **lushman** » Tue Dec 16, 2008 6:59 pm

Hi, FM is great. There is no obvious change when the rear heater is switched on, however there can be a lot of white noise when driving in certain areas where there are a lot of pylons.
Its getting to the stage that I am running out of cd's to listen to!

Paul

Post by **PetrolDave** » Tue Dec 16, 2008 8:12 pm

FM has diversity so if one of the amps is faulty but the other is OK then FM will be OK, so I reckon it's the amp that's used for AM & FM that's faulty.

Not sure which one that is though...

Post by **lushman** » Wed Dec 17, 2008 1:55 am

Thanks PetrolDave, I will look into it

Cheers Paul

Post by **ollys** » Wed Dec 17, 2008 5:42 pm

lushman wrote:Hi, FM is great. There is no obvious change when the rear heater is switched on,

Paul

Hi everyone - I noticed this the other day - rear heater switched on badly affected my FM reception. Is this a common fault? what's the fix?

I also too had non existent AM reception but Audi fixed it for a while with a new Antenna base (f@cking expensive, but under warranty). Now I have another source of interference being a consistent but intermittent whine on AM, which seems to disappear when engine is switched off. Any ideas anyone?

Cheers

Olly

Post by **lushman** » Wed Apr 29, 2009 5:42 pm

Hi Folks, I have finally discovered my poor AM reception. Diversity switch as petrol dave diognosed for me.
With the woes I have been having in getting the right cable for the Phatbox to connect to the cd changer cable I had to remove the cables from the diversity switch and discovered one of the pins on the radio cable to be corroded. I tried cleaning it, however the corrosion has obviously spread onto the circuit board.
I unfortunately took the decision to order from the stealers for £111, but if I can listen to my AM without all the interference I will be a happy man!

Paul

Post by **ollys** » Mon May 11, 2009 4:35 pm

Hi Lushman,

do you have a part no for your switch - I'd like to compare it to the part Audi fitted on mine, which they called a switch box, which did nothing to sort the problem.

Cheers
Olly

Post by **PetrolDave** » Mon May 11, 2009 4:47 pm

ollys wrote:Hi everyone - I noticed this the other day - rear heater switched on badly affected my FM reception. Is this a common fault? what's the fix?

Yes that's a very common fault. The rear window heater is also used as an aerial so there is a filter unit that blocks the DC from the aerial input of the radio, when that filter fails you get poor FM reception. The cure is to replace it.

Post by **lushman** » Mon May 11, 2009 8:17 pm

Hi Olly, I will put up the part number later as I am still in work and it would be easier to get it from the old one as opposed to digging the new one out from the boot!!

Paul

Post by **lushman** » Mon May 11, 2009 10:51 pm

Hi ollys,

The part number for the Switch Box is: 4D0 035 530F

Paul

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