Inspired by @rtlsdr4everyone 's blog post, I decided to throw together a Helix antenna for L-Band Outernet (and Aero etc.) The post is here http://www.radioforeveryone.com/p/easy-antenna-for-outernet-l-band.html
I looked at the calculator that is referenced there and I had:
- some copper wire (from 240volt electrical cable) ,
- and I happened to have a plastic tube that used to hold a map that was 6cm in diameter.
- I bought a 20cm pie pan from the 1 Pound store to use as a counterpoise.
- I had a very old external wifi antenna that had (reverse SMA connector on a short cable )
So I wound the wire on the tube ( by the dimensions in the calculator) I got 5 turns with my scarp wire
I used double sided sticky tape to stick the bottom of the plastic tube to the pie pan.
I soldered the coax on the copper wire ( Sorry but I had to solder!)
I simply punched a hole in the pan and put a self tapping screw with a washer to connect the shield.
I have reasonable quality “wifi antenna” extender cable that cost £8 from Ebay that is 5 meters long using low loss CDF-200 coax ( TP-LINK TL-ANT24EC5S 5m Antenna Extension Cable ) - Not that this has REVERSE POLARITY connectors so you may need adaptors! )
I plugged the cable in to the Antenna ( yes I know the LNA should go at the ant end, but the RP-SMA stopped me!) with the CHIP etc. INSIDE the house, pointed it, and lo & behold 4db signal! I left it out over night ( this the frost on the photos I took this morning! )
Once I get the correct adapters I will try the LNA out there & compare the patch antenna too.
This took me all of 30 minutes to build BTW, and it can see the Aero signals from the bird as well.
Photos below… Note that I have not cut off the extra tube yet… I will!