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Old 06-30-2008, 06:26 AM
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ccfj1 ccfj1 is offline
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Do you still get the whine when you use the VR mode of the ULF, (not when making and receiving a call)?

It could be that the ULF audio out is picking up some interference from somewhere (the amps at a guess), you could try putting a choke of the ULF audio out on the radio modules telephone input pins.
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