Lora antenna

I read some articles and desided to construct my own Lora antenna. See:

• http://martybugs.net/wireless/collinear.cgi
• https://www.thethingsnetwork.org/forum/t/diy-external-antenna-for-gateway/3011
• https://www.thethingsnetwork.org/labs/story/homemade-outdoor-868mhz-antenna
• https://www.thethingsnetwork.org/forum/t/the-big-and-small-antenna-topic-part-1/7880/220

Common info about Collinear antenna's:

• http://www.rason.org/Projects/collant/collant.htm
• http://www.srgclub.org/CollinearAnt-HomeBrew.html
• http://jeroen.steeman.org/Antenna/collinear-coax

Antenne measurement methods and tools:

• http://www.epanorama.net/newepa/2017/10/06/rf-bridge-for-antenna-measurements/
• https://eartoearoak.com/software/rtlsdr-scanner

Order list:

• White (PVC?) pipe 2m by 40mm (test it in microwave to make sure it does not influence the antenna)
• End stop for 40mm pipe
• Chassis mount N connector
• Self made block to screw connector in
• small 3mm screws for connector and endstop in PVC pipe
• foam for antenna stabilisation (I used edge protection for tables used by movers)
• aluminium pipe 2m as antenna pole
• wall mounts for antenna pole
• coax cable (Ecoflex 10)
• SMC connector to connect to gateway
• 4cm by 32mm of pvc pipe as isolator between alumnium pipe and connector
• Duct tape to make the aluminium pipe a tight fit inside the 40mm pipe
• Piece of 2.5 mm2 copper wire

My lengths: 173mm, 259mm, 240mm

I do need to test the antenna but for now it at least is a start. Might need some tuning though.

UPDATE: After measuring the atenna it is confirmed to be completely worthless. I'll have to study a lot to figure out what the problem is but at the moment the antenna just reflects everything.

1) the loops in 2.5mm2 copper wire. Not trimmed to the correct length yet.

2 - 4) N-connector on platsic holder with the correct diameter. A friend of mine created this for me.

N-connector with anttena wire soldered on it

Stopper in the pipe to not push the holder to far in the pipe

Coax cable through the aluminium pipe that is going to be connectod to my chimney

PVC isolator ring to not let the aluminium pipe touch the N-connector

Duct tape around the aluminium pipe to make it a tight fit.

 

1) hot-glue to stabalize the antenna loops. Hopefully the glue does not influence the efficiency

2) foam inside the pipe to hold the fragile antenna in place

3) antenna with foam loops. I tested the foam in the microwave an max power and checked if it stayed cold

4) completed antenna. Here inside my home but is going to be placed on teh chimney

5) schematic representation of the antenna