[TowerTalk] Tower location and house noise

[Wes Stewart]

Not sure what you mean either. "Inside" means... well.... inside, i.e. a 
differential-mode path consisting of a center conductor and the inner surface of 
the outer conductor.  Signals + noise get "inside" via the antenna and anything 
you do to the outside does not affect them.  I'm sorry, but despite claims to 
the contrary, every problem we encounter can't be solved with a common-mode choke.

Wes  N7WS


On 5/25/2017 8:08 AM, Edward Mccann via TowerTalk wrote:
> Not so sure what you mean by "noise inside the line." It has to get "inside" somehow, from whence it is choked almost any convenient place along the line prior to the rig connection.
>
> Slightly off-topic, but an insight into the commercial and aerospace world in EMI is a brief article linked below. Old hat to many of you, I'm sure. Don't panic. The link is almost as long as the article.
>
>
> http://www.mwrf.com/test-measurement/measurements-help-minimize-emi-and-rfi?NL=MWRF-001&Issue=MWRF-001_20170525_MWRF-001_0&sfvc4enews=42&cl=article_1_b&utm_rid=CPG05000004870443&utm_campaign=11276&utm_medium=email&elq2=123c77892aed460e8988051a23926a21
>
> Ed McCann
> AG6CX
>
>
> Sent from my iPhone
>
>> On May 24, 2017, at 8:22 PM, Wes Stewart <wes_n7ws at triconet.org> wrote:
>>
>> I don't know about the worry of choking the line since it's the noise inside the line I worry about, but I would (and do) run low-loss coax (LDF-4 or LDF-5).
>>
>> Wes  N7WS
>>
>>>> On 5/24/2017 12:24 PM, Jim Brown wrote:
>>>> On Wed,5/24/2017 11:40 AM, John Sloop wrote:
>>>> Have you considered open wire?
>>> Only if coax is not practical. Assuming a matched load (resonant antenna), you'll need transformers on each end to get from the low Z of the matched load to the line, and from the line to the rig. Those transformers are not lossless. :)
>>>
>>> And if it's not a low Z matched load, it's not practical to choke it to kill noise, which was the reason for the long run in the first place.
>>>
>>> 73, Jim K9YC
>>>
>>> _______________________________________________