The manual indicates that on the VHF-Hi band, the default step size (the minimum the scanner will tune) is 5 kHz so it would jump from 155.930 to 155.935. This would indicate that 155.9325 wouldn't ba a valid frequency for that scanner on that band. You might want to try one of the two valid frequencies on either side to see if they would allow you to pick up what you want.
Another option (if possible) might to be to switch from 5 kHz step rate to a 12.5 kHz step rate. This may allow you to directly tune the desired frequency. I didn't see in the manual how this would be done, or even it it was possible to change the step rate on that band.
Sorry, but I don't have a BCT-8 to directly try anything at this point though. You might want to check out this thread (
AMR Freq's and BCT8) for a similar issue for another BCT-8 user.