Thanks for the great input. After reading 160 raised / tuned radial
project files, I was moving toward the 1/4 wave radials above ground.
I will see how much wires I can bury in my backyard. Fortunately the
ground conductivity is great here in Dallas.
73 OM, Jon NN5T
From: Larry Loen [mailto:lwloen@gmail.com]
Sent: Tuesday, August 27, 2013 3:38 PM
To: Jon Suehiro
Cc: TowerTalk
Subject: Re: [TowerTalk] Counterpoise / raised ground radial adjustment
method
I don't know about 160, but don't disparage 30 foot radials for 80 and 40
(and 30) on an HF2V in particular.
I was restricted to that, put down 64 radials, and had great result in
Minnesota (average soil). ON4UN says that radials on the ground detune
anyway and the velocity factor is an issue as well. So, you're not as far
off as you may think.
I didn't even have the 30 meter coil, but I got the HF2V to load and worked
lots of DX and I don't mean just France. On 80, I got DXCC, including Zone
23 (often considered the hardest) in a single season.
Larry WO7R
On Mon, Aug 26, 2013 at 3:10 PM, Jon Suehiro <nn5t@attglobal.net> wrote:
I have obtained HF2V with 160 and 30 meter option after moving to this new
location and ready to put up in the city lot.
If buried radials, the max length I can stretch is probably 30 feet in
limited direction. This is not effective enough to cover the low bands.
So planning to place the zigzag wires along inside the wooden fence. I have
approx 40' long x 8' high surface on one side and 30' long x 8' high on the
other side.
(Since not much concern for direct lightening hit so no plan to place 8'
ground rod(s) at the feeding point unless count as a good addition to RF
ground radial system.)
Maybe 2' tall mast for HF2V and 2 each radials for each band 160/80/40/30.
Planning to stretch the ground radial wires in the height of 2~8' (still in
linear loading).
I don't have any idea how it resonates. Currently planning to place 2 wires
on each band as dipole and check the resonate frequency by antenna analyzer
(AIM4170) but ignoring the impedance.
1. Any merit to add 8' ground rod(s) in addition to the ground radials ?
2. Do I need to be sensitive to each ground wire resonate frequency to exact
1/4 wave length, or (cut the wires to 1/4 wave length but forget about the
actual resonate frequency and) final matching condition must be adjusted at
HF2V tuning process ?
3. Is there any additional merit to add any ground sheet even the surface
can be limited to such 15x 30' to low band vertical (mix of buried and
raised radial systems) ?
Thanks for your advice.
73 de Jon Suehiro NN5T
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|