flycatch

When I swing the coil over a target from left to right I get signal return but when I sweep in the opposite direction no signal detected. Is this normal or do I have a defective coil. Both coils that came with the unit do the same thing. This is my first metal detector so I'm not familiar with their technical properties. 

I made my decision and the winner is the Minelab 1000. I chose this detector based upon its design for an entry level machine.

If you reread my post I did say for hunting gold nuggets.

I'm requesting help on which detector to buy for hunting gold nuggetts. I live outside Barstow, California which is located in the Mojave Desert. I'm new to this hobby but have researched the topic and have narrowed the search to five detectors. They are; Minelab 1000,  Whites Goldmaster 24K, OP ORX, Nokta Gold Kruzer and Fisher Gold Bug Pro.  Any and all suggestions would be appreciated.