150 freq collars interfere with dc30 ?

[buzz]

I have been having trouble with a couple of dc30s, and now I think that the 150.950 and 150.980 collars that I have are affecting my dc 30s. I have had trouble before with this combination of collars in the past so I was not using them, but I figured I would try them again. I collared the dogs up to go hunting the other night and I could get a signal on two of the dogs, but not the other two that had the beeper collars on that I talked about above. I waited ten minutes or so and still no signal.So I then plugged both of those beeper collars.Then not two minutes later I got signal. So about fifteen minutes later I unplugged the beeper collars and still had a signal on the dc30s.That lasted about two hours then lost signal on one collar again while the dog was on the box. That was about a half hour without a signal so i went and plugged that beeper collar again and got a signal on that dc 30 again. I am wondering if any one else has had this problem. thanks