Tom:
I currently don't have line isolators such as the Buxcom variety in my shack
at the rig output and the amplifier output, but I'm going to make that
purchase soon. Butch has given me info to work with in this regard.
My coaxial antennas don't have coaxial RF chokes at the feed points, and I
may have to wait until the weather breaks to pursue that angle.
Today, I'm also going to very thoroughly check all coax and common ground
connections in the shack, just to be sure everything is as secure as I think
it is.
As for the modem/router cabling, I'm assuming that is the proper shielded
variety, but will double-check that as well.
All of this will cut down on my contest operating time, but such is life, I
guess.
Tom Behler: KB8TYJ
-----Original Message-----
From: For blind ham radio operators [mailto:[log in to unmask]]
On Behalf Of Tom Fowle
Sent: Saturday, February 20, 2016 2:24 AM
To: [log in to unmask]
Subject: Re: RFI question
tom,
I don't remember if you have common mode chokes or issolators in your
antenna feeds at the antennas. I've also seen mentions of putting same
gizmos in line near the rigs.
if you can figure out whether your router/modem supportes shielded eithernet
cables, make sure your cabling is shielded CAT5
Bet you've done all that <GRIN>
73s
Tom Fowle WA6IVG
On Fri, Feb 19, 2016 at 11:43:39PM -0500, Tom Behler wrote:
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> Hello, everyone.
>
>
>
> I know I'm going to get a lot of different opinions on this question,
> but here goes:
>
>
>
> I have been noticing lately that my RFI problems seem to be getting
> worse here at the home QTH.
>
>
>
> In particular, they seem worse when I'm on CW, and appear on different
> bands to different degrees. The fact that the problems seem worse on
> CW does not surprise me, due to the nature of that mode in comparison
> to SSB, for example.
>
>
>
> What does baffle me is that the problems seem to be getting worse in
> general.
>
>
>
> For example, when I was playing around a bit in the ARRL International
> DX CW contest for an hour or so tonight, I tried going back to a few
> stations with approx. 500 watts, using my MFJ998 and ALS600 with the
> TS590, and I set off the carbon monoxide detector downstairs on the
> main floor of our house. On another occasion earlier in the month, I
> was running 100 watts on CW on 160 meters, and I tripped one of the
> circuit breakers in our house, and caused my wife problems when she was
using her laptop computer in another room.
>
>
>
> I have checked the common ground point on my MFJ feed-through panel,
> and the ground cables for my TS590, MFJ998, and ALS600. All seem to
> be solid, at least here in the shack. The common ground point on the
> MFJ feed-through panel has a cable outside my second-floor shack
> window that runs down to a copper ground rod that is connected to the
> ground on the power box to the house.
>
>
>
> I have not checked the outside ground connections at the ground rod,
> and may try to do that tomorrow.
>
>
>
> My initial thinking is that RF is either coming through the house
> electrical lines, through our cable modem and router, or both.
>
>
>
> I am planning on investing in some RF chokes as Steve (KW3A) has
> suggested, and possibly one or two Buxcom Line Isolators like Butch
> uses, but am wondering if I'm missing something obvious that I should
check into first.
>
>
>
> Any thoughts would be appreciated.
>
>
>
> Tom Behler: KB8TYJ
>
>
>
>
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> link=3Dblue = vlink=3Dpurple><div class=3DWordSection1><p
> class=3DMsoNormal>Hello, = everyone.<o:p></o:p></p><p
> class=3DMsoNormal><o:p> </o:p></p><p = class=3DMsoNormal>I know
> I’m going to get a lot of different = opinions on this question,
> but here goes:<o:p></o:p></p><p =
> class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>I have
> been = noticing lately that my RFI problems seem to be getting worse
> here at = the home QTH.<o:p></o:p></p><p
> class=3DMsoNormal><o:p> </o:p></p><p = class=3DMsoNormal>In
> particular, they seem worse when I’m on CW, = and appear on
> different bands to different degrees. The fact that = the
> problems seem worse on CW does not surprise me, due to the nature of =
> that mode in comparison to SSB, for example.<o:p></o:p></p><p =
> class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>What does
> = baffle me is that the problems seem to be getting worse in =
> general.<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
> class=3DMsoNormal>For example, when I was playing around a bit in the
> = ARRL International DX CW contest for an hour or so tonight, I tried
> = going back to a few stations with approx. 500 watts, using my MFJ998
> and =
> ALS600 with the TS590, and I set off the carbon monoxide detector =
> downstairs on the main floor of our house. On another occasion =
> earlier in the month, I was running 100 watts on CW on 160 meters, and
> I = tripped one of the circuit breakers in our house, and caused my
> wife = problems when she was using her laptop computer in another =
> room.<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
> class=3DMsoNormal>I have checked the common ground point on my MFJ =
> feed-through panel, and the ground cables for my TS590, MFJ998, and =
> ALS600. All seem to be solid, at least here in the shack.
> = The common ground point on the MFJ feed-through panel has a cable =
> outside my second-floor shack window that runs down to a copper ground
> = rod that is connected to the ground on the power box to the =
> house.<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
> class=3DMsoNormal>I have not checked the outside ground connections at
> = the ground rod, and may try to do that tomorrow.<o:p></o:p></p><p =
> class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>My initial
> = thinking is that RF is either coming through the house electrical
> lines, = through our cable modem and router, or both.<o:p></o:p></p><p
> = class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>I am =
> planning on investing in some RF chokes as Steve (KW3A) has suggested,
> = and possibly one or two Buxcom Line Isolators like Butch uses, but
> am = wondering if I’m missing something obvious that I should
> check = into first.<o:p></o:p></p><p
> class=3DMsoNormal><o:p> </o:p></p><p = class=3DMsoNormal>Any
> thoughts would be appreciated.<o:p></o:p></p><p =
> class=3DMsoNormal><o:p> </o:p></p><p class=3DMsoNormal>Tom
> Behler: = KB8TYJ<o:p></o:p></p><p =
> class=3DMsoNormal><o:p> </o:p></p></div></body></html>
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