[GLLUG] Mobile phone antenna / booster
james.dutton at gmail.com
Wed Sep 11 11:46:22 UTC 2013
On 11 September 2013 05:40, Christopher Hunter <cehunter at gb-x.org> wrote:
> Try that by all means, but if the signal is marginal (less than all bars
> lit) bear in mind that a wet roof (very common in the UK) is very
> absorbent to RF. You may lose your already poor signal each time it
Rain fade does not really affect 3G bands (2.1 GHz and 0.9 GHz). It affects
microwave bands more (11+ GHz), e.g. Satellite TV.
UK Freeview terrestrial TV is even lower (0.6 GHz to 0.8 Ghz) so rain also
does not affect UK TV much.
"According to the CWNA Study
2.4 GHz signals may be attenuated by up to 0.05 dB/km by torrential rain or
0.02 dB/km by thick fog. 5 GHz signals may be attenuated by up to 0.5 dB/km
by torrential rain or 0.07 dB/km by thick fog. Rain can also reduce signal
strength through water accumulation on other objects (trees, leaves,
absorbent walls) which serves to increase their attenuation."
See the difference between 2.4 and 5 GHz. 10 times more dB loss.
A loss of 0.05 dB/km by torrential rain is not much at all.
If you start losing 3 dB or more, it becomes important to consider.
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