Texas Instruments CC400DK, Руководство пользователя, Страница: 20 / 22

CC400DK Development kit (rev. 1.5) 2002-09-17 Page 20 of 22
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How to set up a receiver
In receive mode a RF generator can be connected to the antenna input to give an ideal RF
signal to the circuit board for testing the receiver. Use FSK modulation with appropriate
deviation and modulation rate. If you don’t have the equipment to send FSK modulation, you
can use a RF generator with FM modulation and use an external function generator to
modulate the signal with a square wave. The RF signal can also come from the transmitter
via the antenna. An oscilloscope is used to see the Manchester coded signal that is being
received.
Figure: Equipment set-up in receive mode.
Important: The use of radio transceivers is regulated by international and national rules.
Before transmitting a RF signal out on the antenna, please contact your local
telecommunication authorities to check if you are licensed to operate the transceiver.
Appendix A
The component values to the input/output matching network are calculated in the software
program, and consist of C51, C61, L51 and L61. Using the specified component values for
the input/output match will give an optimum match at the specified operating frequency. Minor
tuning of the component values may be necessary to compensate for layout parasitics at
other frequencies or other layouts.
A.1 Fine tuning procedure of LNA/PA matching network
Follow the procedure below to fine-tune the matching network. Use the components that the
software program calculates as initial values. Set the bits F5:F3 = 000 in the Register
configuration window and update the device.
1) Receiver tuning
Oscilloscope
Circuit board
PC
4-10V
RF generator
Antenna
DIO