Icom X-Band 50 Noise Problem

Has anyone experienced a noise problem with the Icom X-Band 50 repeater? I have a new one from the factory which has been returned to them once already for this problem and sent back as fixed, but the noise is still there. When generating a CW carrier into the UHF side, the VHF-AM ground to air side transmits about 4% modulation of pure noise which is unacceptable to me. Also, when powered by 120VAC there is a whine in the background which slowly drifts up and down in frequency. The whine is very annoying, a low level, but annoying. When running on DC power the level of the whine goes down to near the same level as the noise, but is still there. This problem is present when both the UHF and VHF radios are on 50 ohm terminations/dummy loads.



Anyone else observing this problem?