[TVARC] Interference help????

[Ed Deichler]

Dave,

You might try putting small ceramic caps from the speaker leads to ground
to see if that helps.  Years ago before HOA land, I had a problem with RF
getting into my doorbell chimes when running power.  I put a couple of
small caps across the leads and that cured the problem.

Hope this helps.

73 de Ed

On Sat, Jan 4, 2025 at 12:25 AM Dave Alford <kq4vpd at gmail.com> wrote:

> Interference HELP!!!!
>
> I have an IC7300, with rg58 feedline to remote AH-370 tuner mounted at
> eaves, with a 288ft 16 ga wire loop running at 12ft Elev (eave height)
> around perimeter of house.
>
> Feedline comes in thru window to station…maybe 5ft line.  Sharing the desk
> space is my PC, with external speakers.   I have tried to keep PC &
> peripheral wiring and feedlines separate.  Everything is common grounded.
>
> No problems on ssb tx.
>
> Finally got around to setting up paddles for cw . I want to tx on 40m.  In
> CW mode, on 40m, when the paddles are tx, a loud noise is heard from the
> ext speakers.
>
> Have put ferrite beads on, checked all wiring.
>
> Again no interference heard on SSB
>
> On CW mode
>
> 6m NO                 10m No               15m Yes interference
>
>
> 17m Yes
>
> 20m  No                                                              30m
> Yes
>
>
> 40m Yes
>
> 80m No               160m No
>
> I assume the speakers or the PC is picking up RF.  Since only 4 bands
> affected, I don’t think it’s a harmonic issue, but a bandwidth receptivity.
>
>
>
> I can unplug the speakers…symptom cured, but not the problem
>
>
>
> I don’t have anything handy to shield the speakers themselves to see if
> they are reacting to the RF.  They, or the PC itself, could be processing
> RF from the horizontal loop when I tx.  Not sure what else I can do to
> separate the wires on the desk, of if the PC and wires are acting as its
> own antenna.
>
>
>
> So HELP?????  Any ideas…tx
>
>
>
>
>
> KQ4VPD
>
> Dave Alford
>
>
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