I had a similar issue, the fix was a cheap ground loop isolation transformer cable.

Joe WB9SBD
Sig
The Original Rolling Ball Clock
Idle Tyme
Idle-Tyme.com
http://www.idle-tyme.com
On 7/23/2017 7:35 AM, Costantino Cerrotta wrote:
Hi Bill,
thanks for fast reply.
I'm wondering why on JT65 I don't receive this spurious signals..
I have two ferrite clip onto the audio cables from the radio, but maybe I need to put also at rear of PC or elsewhere. I'm sure that when I find big signals, quite always there are spurs on FT8: but this don't change my positive judge to this new mode, that makes faster qsos.
Sorry for poor English.
73s, Costy IC8TEM


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