Eu presumo que você quer dizer o abandono? Não sou especialista, mas você pode estar recebendo uma " limite de piquete " efeito. Você está perto do transmissor quando recebe essas leituras? Se você não receber uma resposta decente aqui, você pode querer verificar algo como um fórum de rádio amador para análise de sinais.
Multipath Interference Multipath Interference (sometimes called picket fencing or flutter) happens when wireless signals bounce around between obstructions that lie between the transmitter and receiver. There may be a direct path between the transmitter and receiver and a secondary path. This secondary path will be a longer path and therefore a percentage of the power of the original signal will arrive later than the signal that travelled via the direct path.
It is possible that there will be a few microseconds of delay between the signal arriving by direct path and the signal that has taken a longer path. This can limit data rate and also limits the area of coverage of any transmitter.