filter for LRL

[ma330]

hi to j-p ,wm6, and other freinds
I made a lrl With your help.I can find the remote gold.Signal generator output power is 10 watts.I have a problem with this detector.I ask you to help me fix this problem.
When I land in addition to the frequency of gold and gold reveals its rusty iron gray.Want to put filter lrl Will reveal that only gold.
Please help me to solve this problem
With respect