[RFI] Old wives tail, or true?

[Dave Cole]

....and look for a reduction in noise.  That is what the data now suggests.

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 4/8/21 6:01 AM, David Gottschalk wrote:
> Interesting, I wondered about the validity of this "test"
> 
> So really the only way to know for sure if you have common mode noise on
> the coax, is to put a filter in place?
> 
> 73,
> David
> KN4ZKT
> 
> On Thu, Apr 8, 2021 at 1:36 AM Jim Brown <jim at audiosystemsgroup.com> wrote:
> 
>> On 4/7/2021 7:38 PM, Dave Cole wrote:
>>> Is this true, and if so, why?
>>
>> No. With the shield disconnected, the antenna is different -- if there's
>> an effective choke at the top, it's now a long wire ending at the choke,
>> because the shield and the center are capacity-coupled together. And if
>> there's no choke at the top, it's a top-loaded long wire.
>>
>> 73, Jim K9YC
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