[Antennas] Radials

[jkolin]

the stepir & 6m ant should work fine w/ur 80m 1/4 wave sloper. Set the stepir for 20m and adjust length & angle of sloper. U shud be able to get very low swr at ur freq of choice. If U add or remove Yagis, the freq of minimum swr will probably change. You may even be able to move that swr point up & down by setting the steppir for different bands.

Did U try a 160 sloper yet? What is the configuration of ur current inv L?

Radials may be needed on the "L".

Jay.....NE2Q
...


Sent by Low Powered, Ultra High Frequency RADIO Transmitter

NE2Q

<div>-------- Original message --------</div><div>From: Mike Reublin NF4L <nf4l at comcast.net> </div><div>Date:04/18/2015  7:57 PM  (GMT-05:00) </div><div>To: jkolin <jkolin at optonline.net> </div><div>Cc: David Robbins K1TTT <k1ttt at arrl.net>,ANTENNAS-Mailman <antennas at mailman.qth.net> </div><div>Subject: Re: [Antennas] Radials </div><div>
</div>Thanks, Jay. 4L SteppIR under a 7L 6M.

73, Mike nF4L
On Apr 18, 2015, at 5:56 PM, jkolin <jkolin at optonline.net> wrote:

got large Yagis on ur tower?
If U do, no need for radials for 1/4 wave slopers.

Jay...NE2Q


Sent by Low Powered, Ultra High Frequency RADIO Transmitter

NE2Q


-------- Original message --------
From: Mike Reublin NF4L
Date:04/18/2015 8:32 AM (GMT-05:00)
To: David Robbins K1TTT
Cc: ANTENNAS-Mailman
Subject: Re: [Antennas] Radials

Thanks, David -

The question really really really was not about safety grounding, it was about the RF return path(ground) for the 160 & 80M antennae as described in the OP.

73, Mike NF4L

> On Apr 18, 2015, at 06:54, David Robbins <k1ttt at arrl.net> wrote:
> 
> Your electrician is right, don't bother with more radials or added ground
> wires.  I would bury the radials you have, but just because I would hate to
> waste the wire, but they aren't going to help significantly for electrical
> safety or lightning protection.  Leaving them on the surface definitely
> won't help either case, for electrical safety or lightning protection you
> want radials buried as deep as possible to provide them the most volume to
> dissipate any current they carry. Putting them on the surface is the worst
> case as they lose half the volume to start with since they can't dissipate
> charge into the air and they have poor contact with the soil.  If you bury
> them at least a few inches down they at least get better contact with the
> soil but still only have about half the effectiveness they would have buried
> 3-4' down.
> 
> As far as for an rf ground, surface radials would help efficiency if you
> were going to feed the tower as a vertical, but then you would want many
> more than 3 and near the surface instead of buried.  Surface or buried
> radials will not help inverted V's or Yagis.
> 
> David Robbins K1TTT
> e-mail: mailto:k1ttt at arrl.net
> web: http://wiki.k1ttt.net
> AR-Cluster node: 145.69MHz or telnet://k1ttt.net
> 
> -----Original Message-----
> From: Antennas [mailto:antennas-bounces at mailman.qth.net] On Behalf Of Mike
> Reublin NF4L
> Sent: Saturday, April 18, 2015 00:04
> To: antennas at mailman.qth.net
> Subject: [Antennas] Radials
> 
> I have a 70' tower with an inverted-L for 160M and a 1/4 w sloper for 80M.
> The tower base has 8 yards of concrete and a lot of rebar. There are 3 #4
> copper wires, with one end attached to each tower leg, then into the
> concrete, attached to the rebar then exits the concrete just under ground. 
> 
> The original plan was to put 3 ground rods along each wire. My electrician
> told me that as far as safety grounding goes, there was no benefit. The
> tower/base megged at 4 ohms.
> 
> The wires are currently rolled up at the base of the tower. If I straighten
> them out and staple them to the lawn, do they then act as radials? Would it
> be feasible to attach more radials to these where they emerge from the
> concrete, so as to avoid having the top of the concrete pad awash in wire?
> 
> 73, Mike NF4L
> ______________________________________________________________
> Antennas mailing list
> Home: http://mailman.qth.net/mailman/listinfo/antennas
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Antennas at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> 

______________________________________________________________
Antennas mailing list
Home: http://mailman.qth.net/mailman/listinfo/antennas
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Antennas at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html