All of the noise problems that I had coming through my radios and the anoying dropouts where I had to disconnect the USB lead then reconnect It to get It to work again have all gone away.
The USB lead (suplied by Air Nav Is of a poor standard) has very poor shielding and I feel that this Is causing the data stream pulses to become rounded instead of a nice square wave, I will investergate further.
A bit disapointed In paying all that money to have a cheap quality USB lead In the kit,I hope the reciever Is better!