- 1 Introduction
- 2 Dipole antennas for TX or RX
- 3 DIY Moxon antenna for TX
- 4 433 Mhz antennas for TX
- 4.1 Yagi antenna with 7 elements, 11.5 dBd, length 70cm
- 4.2 Yagi antenna with 10 elements, 13 dBi, length 1,20m
- 4.3 Yagi antenna with 12 elements 14 dBd, 1,10m
- 4.4 Yagi antenna with 15 elements, 14.8 dBi, length 2.245m
- 4.5 Yak-54’s 3 elements DIY Yagi
- 4.6 Yak-54’s 4 elements yagi
- 4.7 Yagi antenna DIY 4 elements
- 4.8 DIY 7 elements 433 MHz Yagi antenna
- 4.9 DIY 432 MHz Quadruple Quad
- 4.10 Ground-plane antenna for TX
- 4.11 Half-wave coaxial dipoleSubmitted by rcgroups user jvargas (link) :
- 4.12 Ring antenna
- 4.13 Ringo Omni Antenna
- 4.14 Antenna analyzer
- 5 Other DIY Antennas
Antennas are a very important part of the system. There are many different antennas that can be used, but the first remark is to avoid monopole antennas, especially the ones provided with OrangeRX and Wolfbox modules.
Dipole antennas for TX or RX
Dipole antennas give a good range, and are almost omnidirectional : they just don’t transmit or receive in the antenna axis (along the wire). They can be used vertically or horizontally.
It’s better to place them on the wing or rudder, or at least not too close of the motor, battery and other metallic elements that can ‘hide’ them or affect their radiation pattern. Using a length of coax cable is not an issue, just be sure to use 50 ohms cable.
While it’s possible to use longer dipole antennas, the most common size is the half-wave dipole antenna, where the two parts of the antenna measure each one quarter of the wavelength.
The important point is that the waves don’t travel at the speed of light in a material (copper wire for example), and this must be taken into account for calculating the length.
It’s difficult to find the correct measurements, so I made measurements to determine exactly the length correction to apply, and made a ruler that should be printed without any resizing (uncheck options such as ‘adjust to page’ when printing) :
Dipole antenna ruler
Click to open in pdf format :
DIY Moxon antenna for TX
rcgroups user jamesgsf proposed a DIY Moxon antenna (see the ULRS thread here) with a good SWR.
433 Mhz antennas for TX
Yak-54’s 3 elements DIY Yagi
Yak-54’s 4 elements yagi
Yagi antenna DIY 4 elements
Here’s a small DIY yagi that works fine :
DIY 7 elements 433 MHz Yagi antenna
DIY 432 MHz Quadruple Quad
Original source : here
Ground-plane antenna for TX
This one works great (link to order page) :
Ringo Omni Antenna
Interesting vertical antenna including a balun which gives it a perfect 50 ohms impedance :
Other DIY Antennas
Check the user-provided content page for other antenna ideas.