Hi VLF/LF/MF,
Today i've done some important steps on the way to my remote RX site for
VLF/LF/MF:
- Installed the 20W solar module into a tree, about 15m above ground,
see https://dl.dropboxusercontent.com/u/19882028/20140830_171058.jpg
- Installation of the cable down to the shed is finished. I can now
charge 12V lead acid batteries for various experiments!
- Cut some branches to get a better view to the south where the
permanent WLAN link will be established. Now the 2.4 km path is quite
good visible,
https://dl.dropboxusercontent.com/u/19882028/20140830_171125.jpg
- While sitting in the tree i started my netbook, connected a USB WLAN
stick, started inSSIDer software to check the signal levels of my WLAN
access point (AP) and the channel usage. I bought 2 yagis, having "18
dBi gain" and directed them as good as possible. Without any problems i
managed to get access to the AP in the first attempt! Signal levels over
2.4 km distance were up to -59 dBm which is quite a good SNR.
Orientation of the antenna was not as critical as expected.
Thus it appears to be most promising to achieve a reasonable data rate
for the remote link, hopefully even during rain or snow.
Next step will be a fixed installation of the antenna and SNR
optimisation. BTW it is this type of antenna:
http://www.amazon.de/WLAN-Antenne-Yagi-18dBi-Stecker/dp/B004RAH7OG/ref=sr_1_4?ie=UTF8&qid=1409434866&sr=8-4&keywords=18+dbi+yagi
Sorry, this is mostly OT but i know there are a few OMs interested in
remote sites for VLF/LF/MF bands and this may be useful for them and so
for us, if they will realise a similar project.
73, Stefan
|
