| 摘要 |
PROBLEM TO BE SOLVED: To make confirmable the communication state of installation place at the time of installing an automatic vending machine, by converting an analog signal that is outputted from a receiving circuit part which receives radio transmission radio waves for a mobile communication terminal into a digital signal and showing the receiving state of transmission radio waves on a displaying part which shows the intensity of the digital signal. SOLUTION: An antenna 1 and a receiving circuit part 2 receive PHS radio waves which are sent from a base station, an A/D converting part 4 converts an output of the part 2 through an amplifying part 3 into a digital signal and a receiving state (intensity) of the PHS radio waves is shown on a displaying part 5. The part 5 shows by display elements 5a to 5c in three stages (good, common and bad) so that the receiving state of the PHS radio waves can be externally decided. Thus, when a vending machine is installed, it is possible to search for an optimum installation place of the vending machine at the time of using a PHS and exchanging POS information by monitoring the receiving state of radio waves by using this device. |
