EMVs/RemoteControl
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= Antenna fitting = | = Antenna fitting = | ||
| − | + | The system transmits in the Industrial, Scientific and Medical (ISM) Band | |
| + | which is in the range of 433.05 to 434.79 MHz. | ||
| + | |||
| + | The antenna should be 1/4 the corresponding wavelength with an infinite ground plane. | ||
| + | As it is not an ideal system, we will measure the antenna characteristics and trim it to the proper length. | ||
| + | We will use an Agilent E5071C analyser to measure the reflection (s11) of the antenna to its driver. | ||
| + | |||
| + | In order to do so: | ||
| + | * remove the jumper between the antenna and the RF chip | ||
| + | * calibrate the analyser: | ||
| + | ** select <code>cal -> calibrate -> 1-port cal</code> | ||
| + | ** connect the cylindrical dongle's <code>open</code> port and select <code>open</code> | ||
| + | ** do the same for <code>short</code> and <code>load</code> | ||
| + | ** select <code>done</code> | ||
| + | * connect the BNC cable between the analyser and the emitter board | ||
| − | |||
- start : 100 MZ | - start : 100 MZ | ||
- stop : 800 MHz | - stop : 800 MHz | ||
| − | - | + | - |
| − | + | ||
| − | + | ||
| − | + | ||
Connecter à la plaque | Connecter à la plaque | ||
Latest revision as of 12:26, 3 December 2018
... remote control ...
Antenna fitting
The system transmits in the Industrial, Scientific and Medical (ISM) Band which is in the range of 433.05 to 434.79 MHz.
The antenna should be 1/4 the corresponding wavelength with an infinite ground plane. As it is not an ideal system, we will measure the antenna characteristics and trim it to the proper length. We will use an Agilent E5071C analyser to measure the reflection (s11) of the antenna to its driver.
In order to do so:
- remove the jumper between the antenna and the RF chip
- calibrate the analyser:
- select
cal -> calibrate -> 1-port cal - connect the cylindrical dongle's
openport and selectopen - do the same for
shortandload - select
done
- select
- connect the BNC cable between the analyser and the emitter board
- start : 100 MZ
- stop : 800 MHz
-
Connecter à la plaque
avec un marker, chercher le trou dans s11 mettre un marqueur à 433 MHz
arriver à -10dB
résultat : longueur 18.5 cm (lambda/4 = 17.7 cm)
