Well because the aerial is shorter on the phase 3 it needs a signal booster/amp to get good reception. This signal booster/amp is in ether the aerial or the base it screws in to. The signal booster/amp uses a 7v supply from the standard head unit to work, without the 7v the reception isn't going to be that good. When you put an after market head unit in the booster/amp looses its 7v as the after market unit doesn't supply any power through its aerial output.
I found out it's 7v buy measuring my old cd player that came in the car.
The fix I have in place at the moment is the longer aerial off a phase one because its longer and doesn't use a booster/amp it works fine but just looks ugly.
Oh, 12v to the booster worked ok for a few days, so when I installed it I got loads of stations but then a couple of days later it must of burnt out as I lost half the stations.
I found out it's 7v buy measuring my old cd player that came in the car.
The fix I have in place at the moment is the longer aerial off a phase one because its longer and doesn't use a booster/amp it works fine but just looks ugly.
Oh, 12v to the booster worked ok for a few days, so when I installed it I got loads of stations but then a couple of days later it must of burnt out as I lost half the stations.