Transmitter Module Low-Cost SAW-stabilized - Radiotronix - #9

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RCT-433-ASBR DATASHEET Design Hint (T-Pad): The RCT-433-ASBR transmitter can be sensitive to unbalanced or unmatched loads and could fail to operate or operate intermittently in this condition. Try to match your antenna load as close to 50 ohms as possible. Use a T-pad if necessary to give the transmitter a close 50 ohm match before your antenna. A T-pad will also act as an attenuator. See figure 6 below, for a T-pad match/attenuator circuit.
Figure 1: T-pad example Resistor Values in this T-pad example are: R1 – 10 Ohms R3 – 150 Ohms
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