[TVARC] Interference help????

[joe signorelli]

Dave,
I had same experience as Ed except my daughters cb radio was getting into neighbors stereo speakers.  Caps also solved the problem.
73 Joe AB3CR

________________________________
From: tvarc-bounces at mailman.qth.net <tvarc-bounces at mailman.qth.net> on behalf of Ed Deichler <k2te.1nh at gmail.com>
Sent: Saturday, January 4, 2025 9:37 AM
To: Dave Alford <kq4vpd at gmail.com>
Cc: tvarc at mailman.qth.net <tvarc at mailman.qth.net>
Subject: Re: [TVARC] Interference help????

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<mailto: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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