On 12/3/2021 3:53 PM, Andrew Ikin wrote:
I guess what Chuck means, is a Ground loop due to the antenna end of the
coax. screen being connected to Earth thus causing the feeder shield to
become a loop antenna with the ground RF return path to Rx. Hence,
resulting in excess noise pick-up.
A
Are you thinking of a Bias-T?
MFJ sells them with some of their tuners.
-73- FrankKG9H
kg9hfr...@gmail.com
> On Dec 3, 2021, at 5:53 PM, Andrew Ikin wrote:
>
> Chuck Hutton,
>
> Wrote on Dec. 3.
>
> That is exactly what I need so that power can be sent over coax feeds to
> preamp at
Chuck Hutton,
Wrote on Dec. 3.
I guess what Chuck means, is a Ground loop due to the antenna end of the
coax. screen being connected to Earth thus causing the feeder shield to
become a loop antenna with the ground RF return path to Rx. Hence, resulting
in excess noise pick-up.
Normally
EZNEC is correct. Adding more radials, even long ones, in a specific
direction won't preferentially favor the direction in which the radials are
added. It will help raise the overall efficiency of the antenna to a
degree, depending on how many radials are already in place, but any
improvement
On 12/3/2021 1:34 PM, Richard Thorne wrote:
The problem with lightening protectors is the blocking of DC and you
can't send voltage to the switch, pre-amp or what ever your trying to
power over the coax.
There are protectors that don't block DC. A study of mfr catalogs will
find them.
73,
I 'think' what Chuck is trying to do is install a lightening protector
at his coax entrance panel.
The problem with lightening protectors is the blocking of DC and you
can't send voltage to the switch, pre-amp or what ever your trying to
power over the coax.
My solution, good or bad, was
Hi Chuck,
Based on the application you mentioned, I suspect you’re looking for
commercially available bias tees. MFJ sells Bias Tees.
Don (wd8dsb)
On Fri, Dec 3, 2021 at 3:33 PM Chuck Hutton wrote:
> Hi -
>
> Many years ago I saw some ground loop isolators that pass DC.
>
> That is exactly
On 12/3/2021 12:32 PM, Chuck Hutton wrote:
Many years ago I saw some ground loop isolators that pass DC.
There ain't no such thing as a "ground loop." It's a faulty concept, and
using it to solve a problem are a bad idea. Most problems blamed on
"ground loops" are the result of a failure to
Hi -
Many years ago I saw some ground loop isolators that pass DC.
That is exactly what I need so that power can be sent over coax feeds to
preamp at the antenna.
I cant find anything on eBay that mentions passing DC in an isolator. None of
the isolators I have will pass DC.
Does anyone
My shunt fed tower has 36 radials 70 to 100 ft long. Would adding a few
longer radials towards EU help to EU?
Eznec says no.
Ignacy NO9E
_
Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Sounds scary Roger. Glad you came out of it reasonably well.
( I have 52 ft of 1.5"x 4' sections of mil surplus aluminum mast ( one
by one LIFT- then INSERT the next at ground level) laid into a 40 ft
walnut tree, tied at the bottom to the tree trunk and guyed at the top
with five 3/16" cords.
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