interference on medium wave

Hi, ford mondeo 1998, mk2 with fitted radio. Previously had a tomtom pda and
bluetooth gps navigation device, mounted on the windshield and charged by
the cig lighter. Cable would come from the lighter to the mount (pda would
sit in the mount and be charged) and the tomtom would be charged off a cable
coming from the mount.

This generally worked ok. I like to listen to bbcr5 (693mhz) and talk sport
(1071mhz). What i found was bbcr5 performed fine, but I would get some
slight interference on talksport when the pda was switched on.

I have just bought a new pda which is a phone plus pda(xda exec), I have
fitted a mount for this, the power cable is a single cable coming from the
lighter, which (y) splits into two, one cable plugs into the pda the other
into the tomtom gps reciever.

I now find intolerable interference on the medium wave. If the tomtom
reciever is on, and the pda is on, no problem, however, if the tomtom
reciever charger is plugged in, i get a high level of hiss, and if the pda
is plugged in i get nothing more then high pitch whinning noises through the
radio. Sometimes the noise can reduce and the radio is listenable, but
mostly not.

I have tried repositioning the cables, it makes no difference.

Question is, does it sound like the charger cable itself is poorly
insulated, and thats why I am getting the interference?
If so, I am having trouble locating an alternative cable, would wrapping the
cable in insulation tape or any other material reduce the interference??

thanks

Gaz


.

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