While I hate to point fingers in this situation, the symptoms are that of an unstable (noisy) sound card. Given the documentation of insufficient filtering, regulation and bypassing in that particular device, a noisy USB power line (remember the computer power supplies are switchers with the potential for broadband hash) would directly modulate the codec (DAC), and the op-amp audio stages feeding the transmitter.
73, ... Joe, W4TV On 2014-07-01 10:11 AM, David Cole wrote:
Hi, We are starting to focus on the Signalink soundcard itself... I can't imagine it is the Elecraft K3 failing, as a dead carrier does not cause the spray, only when audio is being supplied to the transmitter, and only when from the Signalink, does the problem happen...
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