yep....or a 4.7 peko ferrit ceramic cap is more appropriate apparently for 
1.8 to 30MHZ.
I've used it and it seems to work.
73
Colin, V A6BKX
----- Original Message ----- 
From: "Butch Bussen" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, February 09, 2011 4:06 PM
Subject: Re: interesting RF problem in the shack


> Here is a g trick we use to use years ago.  For a long ground wire, take
> a piece of coax, use center wire for the actual ground, and bypass each
> end to the shield with a .001 cap.  It works.
> 73
> Butch
> WA0VJR
>
> On Tue, 8 Feb 2011, Lloyd
> Rasmussen wrote:
>
>> I think that the 4.7 pF capacitor is bogus.  The capacitance between 
>> center
>> conductor and shield of even a few inches of coax is more than that.
>>
>> But creating a quarter-wave ground "counterpoise" connected to the 
>> station
>> ground often helps, as mentioned in a previous message.  The far end of 
>> the
>> wire might be hot, so don't put it where people are likely to come in
>> contact with it.  For 20 meters, a quarter wavelength is about 16 feet.
>> This would be the length from whatever you consider to be your station
>> ground; perhaps the back of your amplifier.
>>
>> Lloyd Rasmussen, Kensington, Maryland
>> Home:  http://lras.home.sprynet.com
>> Work:  http://www.loc.gov/nls
>>
>>> -----Original Message-----
>>> From: For blind ham radio operators 
>>> [mailto:[log in to unmask]]
>>> On Behalf Of Gale Conard
>>> Sent: Tuesday, February 08, 2011 12:17 AM
>>> To: [log in to unmask]
>>> Subject: Re: interesting RF problem in the shack
>>>
>>> Here is something I saved from a previous discussion about grounding.  I
>>> haven't tried it, but several hams have testified that it has worked for
>>> them.
>>>
>>>
>>>
>>> Hi list:
>>> i think it was John who was saying that he has some grounding problems
>>> being on the second floor.
>>> I found a good method of helping to get rid of some of the floating
>>> ground problems.
>>> You use a peace of RG58 coax and put a 4.7  peaka farad seramic
>>> capacitor across between the ground shield and center line of the coax =
>>> on each end of the length you will need to go from your station to your
>>> ground rod or an adequet ground somewhere.  Connect the center line of
>>> the coax to ground and the center of the other end to the radio or to
>>> your common station ground in the shack.  This is supposed to help to
>>> eliminate floating ground and keep all the extra RF going to ground
>>> instead of coming back up your ground line.
>>> Regards
>>> Colin
>>> ----- Original Message -----
>>> From: "tom behler" <[log in to unmask]>
>>> To: <[log in to unmask]>
>>> Sent: Monday, February 07, 2011 7:57 PM
>>> Subject: Re: interesting RF problem in the shack
>>>
>>>
>>>     Steve:
>>>
>>> I used this exact same set-up out in Colorado before I came back to
>>> Michigan, and before I installed the Windom.  In fact, it's what I ran 
>>> the
>>> Cross-country Blind ops net with last year, without a grounding system 
>>> at
>>> all.
>>>
>>> The only thing I can think of that is different here in Michigan would 
>>> be
>>> the Windom installation itself.  But, the Windom is on a completely
>>> different antenna port on my Window feed through panel, and on my 
>>> TenTech
>>> manual tuner.
>>>
>>> I will try grounding the rig-runner by connecting it to the common 
>>> ground
>>> in
>>> the shack, and will also try your ferrite solution.
>>> Admittedly, before the Windom became unusable, I don't think I ever used
>>> the
>>> DXCC back here in Michigan on 20 meters ever since we returned. 
>>> Therefore
>>> it's inpossible for me to tell if the problem existed before without my
>>> knowing it.
>>>
>>> 73 from Tom Behler:  KB8TYJ
>>>
>>>
>>>
>>> ----- Original Message -----
>>> From: "Steve Forst" <[log in to unmask]>
>>> To: <[log in to unmask]>
>>> Sent: Monday, February 07, 2011 9:33 PM
>>> Subject: Re: interesting RF problem in the shack
>>>
>>>
>>> Tom,
>>>
>>> Grounding might not be a bad idea. Also,  if you have any ferrites
>>> around, I would try clamping a ferrite on the line from the power supply
>>> to the rig runner, and also the line from the rig runner to the radio.
>>>    Maybe disconnect any other gear that is connected to the rig runner
>>> to try and isolate the source.   Perhaps move the rig runner as far as
>>> possible away from the amp.
>>>
>>>
>>>
>>> Have you worked that combo of antenna/amp/band before?  Did this just
>>> pop up out of the clear blue?  If it worked fine before and now has
>>> problems, what has changed in the station that you can  try reversing?
>>>
>>>
>>> And I thought I had problems...
>>>
>>> 73, Steve KW3A
>>>
>>> On 2/7/2011 8:58 PM, tom behler wrote:
>>>> Hi, all.
>>>>
>>>> Well, I know I'm going to get varying opinions on this one, but that's
>>> ok,
>>>> since I'm looking for a number of possible alternative causes and
>>>> solutions.
>>>>
>>>> As many of you know, I have gone back to using my Alpha Delta DXCC
>>> antenna
>>>> as my HF antenna, until my Windom, which took a dump on Saturday, can 
>>>> be
>>>> resurrected.
>>>>
>>>> The DXCC works great on 40 meters with both 100 wattts, and my 
>>>> Ameritron
>>>> AL811H amplifier.  However, when I went to do the Cross-Country blind
>>> ops
>>>> net on 14.258 yesterday, I had an interesting experience.  Things 
>>>> worked
>>>> great with 100 watts, but when I kicked the amplifier in, and tried
>>>> running
>>>> things on the usual 600 watts, I ran into problems.  As soon as I keyed
>>>> the
>>>> mic, the protective circuit in my Rigrunner tripped, and everything in
>>> my
>>>> station went silent.
>>>>
>>>> I have no other indications of RFI anywhere else in the house or the
>>>> shack.
>>>> In addition, my SWR's are good with the DXCC on 20 meters (about 1.5 to
>>> 1)
>>>> without the tuner, and obviously just as good with the manual tuner.  I
>>>> use
>>>> my usual procedure to tune the amp, and everything works there as well,
>>>> giving me forward and reflected power readings I would expect.
>>>>
>>>> Could anyone tell me what you think is going on here?  Do I still have 
>>>> a
>>>> grounding issue of sorts, even though I've gotten no indication of
>>>> grounding
>>>> issues with other applications?
>>>>
>>>> Other than reducing power, is there anything anyone can suggest for me
>>> to
>>>> do
>>>> to try to solve this problem.
>>>>
>>>> I was thinking of grounding the Rigrunner by connecting a ground cable
>>>> from
>>>> the cover of the Rigrunner to my common station ground, but just 
>>>> haven't
>>>> gotten to it yet.
>>>>
>>>> It's just a strange problem, and only seems to occur on 20 meters with
>>> the
>>>> amp.  I never had the problem at all out in Colorado, where I had no
>>>> station
>>>> grounding system at all.
>>>>
>>>> 73 from Tom Behler:  KB8TYJ
>>>>
>>> 73,
>>>
>>>
>>>
>>> Gale
>>> [log in to unmask]
>>
>>