摘要:
A signal attenuator may have a first attenuator (1t) and a second attenuator (2t). The first attenuator (1t) is a &pgr;-type resistance attenuator and includes resistors (R1, R2 and R3). The second attenuator (2t) is a &pgr;-type resistance attenuator and includes resistors (R4, R5 and R6) and negative temperature coefficient thermistor (R7). The first attenuator (1t) may be a T-type resistance attenuator. The first attenuator (1t) may be connected in series to each of the input and output of the second attenuator (2t). Such signal attenuators compensate for changes in signal amplitude caused purely by changes in ambient temperature.
摘要:
A second processor 6 inserts data to be transmitted and pointer information into a data packet and transmits the data packet at step S20 and then determines whether an acknowledgement from the receiving party has been received at step S22. If no acknowledgement has been received, a determination is made as to whether the number of re-transmissions is equal to or less than a predetermined re-transmission number at step S32. If the re-transmission number is equal to or less than the preset value, then a data packet 16 with the same data is transmitted at step S20. However, if the re-transmission number has reached the preset value, then the number of data bits per data packet is reduced at step S36, and a data packet with reduced data is transmitted at step S20.