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trasmitter module cant work on pcb

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mango

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i have a quasar 868MHz Fm transmitter and receiver for my data transmission. When i try this module by using bread board, the data can be trasmitted but the range not far. When i solder my components on the pcb board, it cant work totally...may i know y? Do i need to add extra components to the module?
 

your problem is a general problem.
when you solder your IC on pcb, you must check your vcc gnd ground pins connection. short circuits by soldering or by pcb.
the only person whon can help you is yourself. you must check your pcb carefully.
check dc volrage and currents carefully to find the problem.

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Hi,

You should take care about the connection of the antenna pin on the pcb, and the the dimesioning of the antenna itself.
Try to solve the problem step by step. If you don't have a spectrum analyser, use the receiver module RSSI pin to verify the transmitter power output. First do the measurement on the breadboard, after that solder the transmitter module on the pcb and do the measurement again (use the receiver module in the same configuration for the both cases). The transmitter output has to be around 1mW (0 dBm), so you should connect the receiver input to the transmitter through an adecvate (at least 20 dB) attenuator. If all these are verified, test the antennas.

Good luck.

Al
 

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