Topband: Adding chicken wire or mesh on top of radial field

[Mark van Wijk]

Some field experiment results from 2016


Location: large farm field

Antenna: Inverted L, using two 21m masts

Note: this theoretically puts Rs at around 18 Ohm



Ground:
- Checken mesh: 6 pieces 8x1m crossed under the TX vertical, which 
offers almost 100% coverage at  8m diameter
- PVC insulated copper-wire  radials, 40 pcs 85ft/25m

Antenna Analyzer: AA-54
After finalizing the antenna Z=28.2 Ohm


Two days later we dismantled the antenna, but performed some 
intermediate measurements.


chicken Mesh + 40 radials   Z= 25.4 Ohm (lower because the inv-L part 
started to sag)

chicken mesh +40 radials(rads all electrically disconnected)  Z=33.4 Ohm

chicken mesh only (radials removed from site)  Z=38.7 Ohm

I can not draw any conclusions from this single setup experiment.


Pictures available at 
https://www.flickr.com/photos/pa5mw/albums/72157663223247069/with/24490646102/


73
Mark, PA5MW


On 6/3/2018 10:14 PM, Peter Bertini wrote:
> Why would bonding the added matting be required if it is laid over or
> beneath an existing radial field?  It reduces ground losses regardless.
>
> Peter
> _________________
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