CIRCUIT DESIGN CDP-RX-02AN Bedieningshandleiding - Pagina 9
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Outputs:
At the receiver side 3 output signals are available.
AF is the direct analog output of the FM receiver.
This signal can be used for checking the receiver and in cases where signals with additional
analog modulation are to be received. For example, it can be connected to an MSK decoder.
The DATA output is a digital open collector output. An internal 10KOhm pull-up resistor is
applied to enable direct connection to CMOS compatible circuits. For other applications an
additional external pull-up resistor should be used.
The receiver has no internal mute circuit to avoid delays and achieve maximum sensitivity.
The AF and DATA output will show noise on the output when no signal is received.
The third output is called RSSI. It is an indicator of the received signal strength. It can be used
to drive an external mute circuit.
Test Set ECB-03 and DCB-03
The Test Set ECB-03 and DCB-03 were developed to demonstrate and test the CDP RF data
modules. In combination with the transmitter and receiver modules, it is a full four command
radio remote control that can be used for various practical applications.
The Test Set will save time and effort in planning new developments that incorporate the
CDP-02N radio modules as the radio link.
Antennas:
Most important for safe data transmission is a good antenna, and RF grounding, both for the
transmitter and the receiver. Without an antenna it is impossible to transmit data over a long
distance range.
The standard antenna is a Lambda/4 wire protected by a plastic cover.
The receiver has a simple antenna input pin. Any suitable UHF antenna can be connected to it.
The easiest way to connect an antenna to the CDP-RX-02N (CDP-RX-02AN) is to solder a
17cm wire directly to the antenna input. A 50Ohm coaxial cable can be used extend the
distance between the antenna and the receiver. The shielding of the antenna wire should be
soldered to the case near the antenna input of the CDP-RX-02N (CDP-RX-02AN).
It is possible, but not recommended to connect the receiver module and the antenna by a
connection on a PCB. This will decrease the receiver performance in most cases.
To find the best method of installation for the transmitter and receiver, many things should be
considered and tested. It is recommended that the user read specialized literature on antennas
and radiation characteristics to gain a better understanding of these fields. A detailed
explanation cannot be given here.
CDP-02N UHF Synthesized Radio Data Module Operation Guide
CIRCUIT DESIGN, INC.
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