Yes, center on each end and shield bypassed to center on each end.
Works. Although I haven't had a station ground for years and get along
73
Butch
WA0VJR
Node 3148
Wallace, ks.
better that way. On Sat, 20 Feb 2016, howard kaufman wrote:
> I think I remember this right.
> If you have a long path to ground,
> Use a piece of coax. Place a .01 mfd capacitor between the shield and
> center conductor at the ground rod. Connect the rod to the center
> conductor.
> I think you only connect the center conductor to the station common ground.
> Not exactly sure about the top connection.
> This shields the ground wire, and prevents it from becoming a radiator.
>
>
> -----Original Message-----
> From: For blind ham radio operators [mailto:[log in to unmask]]
> On Behalf Of Bob Tinney
> Sent: Saturday, February 20, 2016 8:38 AM
> To: [log in to unmask]
> Subject: Re: RFI question
>
> Tom,
>
> Either your long ground wire is causing a radiating ground loop or you've
> got RF coming back down the shield of your coax. You could try a coax choke
> at the antenna or try changing the length of your ground wire or try tuning
> it, or try just disconnecting it
>
> Bob, K8LR, [log in to unmask]
>
> On 2/19/2016 11:43 PM, Tom Behler wrote:
>> This is a multipart message in MIME format.
>>
>> ------=_NextPart_000_0010_01D16B6F.5C4D5990
>> Content-Type: text/plain;
>> charset="us-ascii"
>> Content-Transfer-Encoding: 7bit
>>
>> 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>
>> ------=_NextPart_000_0010_01D16B6F.5C4D5990--
>
>
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