Qczek RC Blog

DIY biquad antenna vs other ready to use antennas you can buy

May
16

I made my  biquad antenna i did some simple measurements to compare it to other antennas used for FPV.

It is very simple, I used Semi-rigid Flexible RG40 cable, inserted into small brass tube to make antenna tuning possible.

20160514_213326

20160515_225712

My RF generator tuned to 1280Mhz and bidirectional coupler was used to find best distance between antenna elements end reflector.

Next I connected inverted vee antenna and placed generator about 3m from measured antennas.

generator

gen_place

There ware 4 different antennas measured

antennas

Measurement’s done using ImmersionRC RF Power Meter directly connected to the antenna…

m_whipe

m_yagi

m_bev

m_biquad

And results:

  1. DIY biquad -21.57dBm
  2. BEV antenna -23,43dBm
  3. WA5VJB pcb yagi -27,12 dBm
  4. whip antenna -30,83

So DIY biquad seems to be about 3dB better then BEV antenna, and should extend FPV distance about 40%…

The antenna will be placed (with 5.8G video retransmission TX) on  4m fishing rod.

retr1

retr2

I’m going to check how it works, and will keep you update.

 

 

 

 

2 Responses to DIY biquad antenna vs other ready to use antennas you can buy

  1. How did your testing of the antenna go?

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