I use 2 OCF antennas, coax fed with proper feed point baluns. I have zero rfi
even with AT&T router, network cable, 3 computers and a tv set all within a few
feet of each other. I would not be too quick to blame your OCF antenna. The
problem is likely with bonding/grounding, cable connections, etc.
--------------------------------------
Wes Attaway (N5WA)
(318 ) 393-3289 - Shreveport, LA
Computer/Cellphone Forensics
AttawayForensics.com
<div>-------- Original message --------</div><div>From: Matthew King - KK4CPS
<KK4CPS@gmail.com> </div><div>Date:12/02/2017 6:43 PM (GMT-06:00)
</div><div>To: </div><div>Cc: RFI List <rfi@contesting.com>
</div><div>Subject: Re: [RFI] RFI In My Shack </div><div>
</div>Dave, there's nothing wrong with an OCFD *IF* it's fed properly, i.e.
through *proper* baluns & chokes. The fundamental band of the antenna (40
or 80, for example) and the exact split make huge differences.
Clearly you've had a bad an experience with a bad OCFD if you think ANY
vertical, even with decent radial field, will outplay it! Having used
both, I can tell you with certainty that it's simply not the case.
Read the links that I posted earlier in this thread and you can learn a
lot. The OCFD can be an outstanding antenna, but not if it's thrown up over
a roof with a 33%/67% split on 80m with a 4:1 voltage balun in it. THAT is
a recipe for disaster!
Jim's publications on the subject illustrate *proper* chokes. Check 'em
out....
73, y'all
Matt
AK4MK
On Sat, Dec 2, 2017 at 7:34 PM, Dave Cole (NK7Z) <dave@nk7z.net> wrote:
> I'm with Jim here... This is a recipe for RFI...
>
> If it were me, I would replace the OCF dipole with almost anything else,
> especially if you are running power. That type of antenna causes more RFI
> issues than almost any other type of antenna, save an end fed...
>
> You made a comment about needing the power to get out, that might indicate
> an antenna issue, so maybe replacing the OCF with a good vertical and a
> decent radial field, or a dipole, up as high as possible, is in order
> here...
>
> 73s and thanks,
> Dave
> NK7Z
> http://www.nk7z.net
>
> On 12/02/2017 02:50 PM, Jim Brown wrote:
>
>> On 12/2/2017 1:59 PM, Joe wrote:
>>
>>> I use coax as a feed, not twin lead. Twin lead will not survive 100 mph
>>> winds, which are common at my location.
>>>
>>
>> N6BV, retired ARRL Antenna Book and Handbook editor, wrote a great piece
>> that ran in QST about two years ago showing that even with coax, a choke
>> will fry very quickly when feeding an antenna not matched to the feedline
>> (that is, up in the air).
>>
>> 73, Jim K9YC
>>
>>
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