I have an INRAD 400hz 8mhz cw filter. When turning the cw vbt counterclockwise, instead of narrowing the bandwidth, it gets wider. VBT works ok without the filter kicked in. Is this due to the INRAD or misalignment? The Manual says cw bandwidth should decrease to 150hz with the filter in line and vbt fully counterclockwise. Any suggestions? Steve N4LQ