Am 05.07.19 um 23:26 schrieb Poul-Henning Kamp:
In message <28f942e8-b61d-4fa5-929d-923184828...@n1k.org>, Bob kb8tq writes:
Energy flow is indeed inside the cable if things are set up and operating
correctly.
Please note in this context that *nothing* about lightning strikes
works
On 7/5/19 2:26 PM, Poul-Henning Kamp wrote:
In message <28f942e8-b61d-4fa5-929d-923184828...@n1k.org>, Bob kb8tq writes:
Energy flow is indeed inside the cable if things are set up and operating
correctly.
Please note in this context that *nothing* about lightning strikes
works the
In message <28f942e8-b61d-4fa5-929d-923184828...@n1k.org>, Bob kb8tq writes:
>Energy flow is indeed inside the cable if things are set up and operating
>correctly.
Please note in this context that *nothing* about lightning strikes
works the way you would assume it does.
Cables run
Hi
The purpose of coax is to shield the signal. The outer portion of the cable
acts to protect the inner part from stray signals in the environment. In a
normal
system, the outer braid is connected to ground. It is no different than a lot
of audio
cabling in that respect.
Energy flow is
On Fri, 5 Jul 2019 at 18:01, WigglePig wrote:
> If there are currents in the braid to upset then your antenna system is
> not working as you might believe.
>
I was working on the simplistic assumption that for a current to flow,
there must be a complete circuit, so the current flows down the
Hi,
> Plus as the pole moves in the wind (they all do) the cable can move
> about inside, and if repeatedly impacting the inside of the pole over
> time, that will damage the cable.
You fix the cable inside the pole by applying three cable ties as a
triangle in regular intervalls. The loose
If there are currents in the braid to upset then your antenna system is not
working as you might believe.
> On 5 Jul 2019, at 10:46, Peter Vince wrote:
>
> Thank you all for your replies. A case of a little knowledge being a bad
> thing in my case. But at least I was aware of a potential
On 05/07/2019 06:01, Gerhard Hoffmann wrote:
>> Hello all,
>>
>> A new contact, whose background is in computer programming rather than
>> RF, is getting into accurate GPS positioning, and has been tapping me for
>> any knowledge I might have. I persuaded him to get the new Ublox F9P
>>
Thank you all for your replies. A case of a little knowledge being a bad
thing in my case. But at least I was aware of a potential problem to be
considered! :-)
Thanks again,
Peter
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To
In a (almost) ideal coaxial cable (almost) *all* RF electromagnetic field is
inside the cable.
Unlike ladder balanced transmission line where it is everywhere else in the
universe.
Leo
> From: Peter Vince
> sure of the best advice to give him. I'm sure I heard that you should
> never drop the
Hi Peter,
>> you should
>
> never drop the coax down the middle of your support-pole, as the conducting
> pole will mess up the characteristics of the cable by affecting the
> currents in the outer braid.
Well, that is true for ’twin-lead’ (“TV antenna wire”), but is not an issue for
coax.
Am 04.07.19 um 22:43 schrieb Peter Vince:
Hello all,
A new contact, whose background is in computer programming rather than
RF, is getting into accurate GPS positioning, and has been tapping me for
any knowledge I might have. I persuaded him to get the new Ublox F9P
receiver and also a
Hello all,
A new contact, whose background is in computer programming rather than
RF, is getting into accurate GPS positioning, and has been tapping me for
any knowledge I might have. I persuaded him to get the new Ublox F9P
receiver and also a "proper" dual-band antenna - albeit from
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