Sorry about the newbie question but I can't work this one out.

When I plug my external microphone into my camcorder, I only record sound in one channel and can only hear one channel in the headphones.

The microphone has a 6.3mm mono plug which I have inserted into a 6.3mm - 3.5mm adapter to fit the camcorder. I've tried adapters with mono and stereo 3.5mm jacks but always get just one channel recording.

It's only a bog-standard Panasonic NV-GS11EB MiniDV Digital Video Camera but surely I should be able to record to both channels.

Any help appreciated.