[Antennas] Quick Question. I hope.

Wed Nov 1 13:44:08 EST 2006

My colinear does not need a ground plane and I (obviously) did not realize
that all colinears were the same operation. BTW, it is a comet model mobile
and is about 62 inches tall above your choice of "mounts". Mine is made as
an antenna that will work fine on a fiberglass boat or anywhere else you
want to place it whether on the deck railing or the wooden kitchen table or
the picnic table in the park. SWR is fine and performance is outstanding,
better than several 5/8 waves I have (including 90ドル ones).
Please excuse me for any other statements that I have made. I will try to
refrain from commenting on any other traffic on this reflector.
I know what works for ME and what the SWR is and how well it works.
73, de Jim KG0KP
----- Original Message ----- 
From: "KD5SFA" <divenut1 at sprynet.com>
To: <antennas at mailman.qth.net>
Sent: Wednesday, November 01, 2006 11:18 AM
Subject: Re: RE: [Antennas] Quick Question. I hope.
> Again not true.
> I have a colinear dual band vertical at home.
> It's 3 - 5/8ths wave sections and has a ground plane.
> I have a 5/8 over 5/8 wave colinear mobil antenna
> that does need a ground plane.
> I have a colinear mobile antenna 1/2 wave over 1/2
> wave and it does not need a ground plane. I have a
> 1/2 wave vertical for 10m that does not need a ground
> plane. 1/2 wave verticals do not need a ground plan...
> They have a matching section. Odd multiple 1/4 wave
> antenna require a ground plane or the equivilant matching
> section.
>> 73,
> Jon
> KD5SFA
>>>> -----Original Message-----
> >From: Jim Miller <JimMiller at STL-OnLine.Net>
> >Sent: Nov 1, 2006 12:12 PM
> >To: DavidE Benedict <iam at pmug.org>, antennas at mailman.qth.net
> >Subject: Re: RE: [Antennas] Quick Question. I hope.
> >
> >NOT true. ONLY "Collinear" antennas do not need a ground plane. ALL
other
> >mobile antennas or verticals require a ground plane. I think you have
just
> >realized your SWR problem. Provide the ground plane and you should have
the
> >SWR come in. The ground plane (at least for test purposes) can be simply
3
> >or 4 wires of 19 inch length connected at the feed point to the shield
side
> >of the coax.
> >
> >73, Jim
> >
> >----- Original Message ----- 
> >From: "DavidE Benedict" <iam at pmug.org>
> >To: <antennas at mailman.qth.net>
> >Sent: Wednesday, November 01, 2006 10:31 AM
> >Subject: Re: RE: [Antennas] Quick Question. I hope.
> >
> >
> >CBoone at earthlink.net writes:
> >>Indoor antennas are always a pain....especially for 6m....2 should be
easy
> >>to do BUT remember, an indoor antenna has a 12db loss compared to the
same
> >>antenna outside!! 12db is a 20:1 power level.....IF you can run a single
> >>coax outside, try putting a 5/8wave antenna on a good ground plane (54in
> >>radials)....that will work on both 2 and 6mtrs and the higher the
> >>better...even a small RG58 run can be done through most windows
> >>thresholds...
> >>Likely you have some metal in the vicinity of the indoor antennas....or
> >>the
> >>ground plane is not sufficient...
> >>
> >>Chris
> >>WB5ITT
> >>(also running a 857D on 6 and 2 using a NMO150 on top of the company van
> >>;)
> >
> >
> >Hmmmm...where does that 12db loss come from just by being indoors?
> >...doesn't sound right.
> >
> >My understanding is that 5/8 wave ant does not need radials or
groundplane.
> >
> >David B.
> >W7DBH -Mobile Only
> >
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