I can attest to the improvement in 160M at KP2M when we switched to the FCP.
73,
N2TK, Tony
-----Original Message-----
From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of Guy
Olinger K2AV
Sent: Tuesday, November 28, 2017 9:19 AM
To: Clive GM3POI <clive@gm3poi.com>
Cc: TopBand List <topband@contesting.com>
Subject: Re: Topband: 160 inverted L radials question
Hi James,
The vertical really needs to come down directly to the central common point
of the radial field for them to operate with all the advantages. Running a
single wire from the base of the vertical at the ground 30 feet over to the
center of a radial field could easily lose 3 or 4 dB, more if your soil is
"poor". Really bad idea.
If you simply *must* move the vertical, and the radials simply *cannot* be
redone in the new position, you could consider raised radials, or an FCP
with an isolation transformer. KP2M on STX was using an L over FCP until the
hurricane, and lost his antennas. He hasn't been able to rebuild the house
or antennas yet due to the electrical and building supply conditions there
which I'm sure you are very familiar with. An L over FCP is extensively
discussed at k2av.com, including some important aspects of an L that seem
fairly unknown to the ham populace, that apply regardless of the
counterpoise in use.
Use of 4 raised 1/8 wave radials with an isolation transformer and a series
inductor for tuning a short L has significantly improved performance in some
specific instances over ON4UN's specified setup with 1/8 wave radials.
73, Guy K2AV
On Tue, Nov 28, 2017 at 8:41 AM, Clive GM3POI <clive@gm3poi.com> wrote:
>
>
> -----Original Message-----
> From: Topband [mailto:topband-bounces@contesting.com] On Behalf Of
> james soto via Topband
> Sent: 28 November 2017 13:26
> To: topband@contesting.com
> Subject: Topband: 160 inverted L radials question
>
> Hi folks:Iam in the process to reinstall an inverted L antenna. Due to
> the category 5 hurricane that passthru the island of ST.CROIX usvi i
> loss 2 towers and antennas.one of the towers use to support and
> inverted L antenna for 160 with radials all over the tower. I will
> reinstall the inverted L on a different location about 25 or 30 feet
> away from the original location.my question is could i use the same
> radials from the previous location just running one wire attach to the
> radial system to the new inverted Lground section?
> ThanksKP2BH/Jimmy
> _________________
> Topband Reflector Archives - http://www.contesting.com/_topband
>
> _________________
> Topband Reflector Archives - http://www.contesting.com/_topband
>
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
|