The basic outline;
- The transmitter itself is rather fragile
- The antenna is a one quarter lambda wire
- No connector to attach a better antenna
- Needs a stable power supply
- The receiver does no white balance compensation,
so pictures can become very light
- Blows away any WiFi signal
As side note; higher power transmitters do have external antenna’s.
- The transmitter is very small
- It is easy to connect power and audio and video connections
- The receiver is easily configurable and connectable
- The receiver has a decent box and external connector to connect a bigger antenna
- The transmitter is creating a 10mW signal as advertised.
What is it?
Because we had to fix the antenna we had to open the transmitter and reconnect the wire. This shows the small video transmitter we can easily take with us on model aircrafts the transmitter is only 8 grams.
The connector is equal to the old fashioned soundcard connectors that connected the CD-ROM audio to the soundcard.
The specifications of the device;
T/R Frequency: 2.4GHz
Output Power: 10mW
Unobstructed Effective Range: 50 ~ 100 m
At CE-Test we tested the wireless specifications.
This showed us the output is truely 10mW and within an acceptable spectrum in the 2.4GHz spectrum.
Outdoor testing setup
We wanted to know how well the original setup would perform. For this test we have attached the transmitter to the Mikrokopter with the Canon Digital camera. And attached the receiver to a pole so it would come a bit higher.
We have found the following range;
So we can conclude that up to 150 meters the default set up is able to transceive a moving video signal using no extra means.
150 meters using the default antenna is more than advertised even in suboptimal conditions. Increasing the receiver sensitivity using a higher gain omni-antenna would be an easy way to gain performance. It is likely that a biquad butterfly attached to the mikrokopter could even significantly increase the output of the transmitter.
Although we got a good reception when the engines were off, the reception decreased significantly when the engines were on. It is still open if we could compensate this using a better (dedicated) powersupply or better shielding.