Some rigs, even high-end rigs including the FTdx5000, exhibit a spike on initial transmit. I noticed it mostly with the amp. The power would surge briefly, and then return to the dial value.
I suspect the combination of the surge and a bit of RFI is causing the problem. I suggest an opto-isolator on both ends of your CAT cable. They are available for RS-232 and USB. That, plus some ferrites along the run should help with the problem. Also, if you're using a desktop, try running several ground straps to the case of the computer. Consumer-grade computers aren't very resistant to RFI, and there is no bonding between the pieces of sheet metal. 73, Frank KF6E
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