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What is causing extraneous noise on Flex-1500 transmit?

Member, Unconfirmed ✭
edited June 2023 in FLEX Series (Legacy) Radios
See RF output scope shot at bottom of my QRZ page. Crunching noise happens only on first dit when T/R switch is activated. All subsequent elements are clean until receiver has been back on after break-in delay. Noise also can be seen when you press MOX.

Does anyone have a suggestion as to the cause? Thanks and 73. Jim AJ8S
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