This appears to be a text message from a ham radio operator, likely using a software-defined radio (SDR) or a digital mode decoder to receive and decode the transmission.

Here's a breakdown of what this might mean:

* "01:57" suggests the time of day (01 hour 57 minutes)

* "JP1WAN" is the call sign of the transmitting ham radio operator, which appears to be located in Japan.

* "JP-1310" and "(Chigasaki Satoyama Prefectural Park)" likely refer to the location where JP1WAN is operating, as well as a specific park or geographic feature.

* "JP-KN" might indicate the region or province within Japan where JP1WAN is located.

* "430510.0" appears to be the frequency in megahertz (MHz) that was used for the transmission. In this case, it's on the 43 MHz band, which is a popular range for amateur radio operators.

* "FT8" suggests the digital mode being used for the transmission. FT8 is a narrowband digital mode developed by Joe Taylor K1JT and Steve Walsh N7UN, designed for low-power, long-distance communication between amateur radio stations.

* "-3 dB via JI1HFJ-#[JI1HFJ-#]" indicates the signal strength (in decibels) of the transmission as received at a particular station or network ( likely an RBN or Reverse Beacon Network server). The "#[JI1HFJ-#]" part seems to be related to the station that relayed this message.

To summarize, this is a ham radio operator's call sign and location, with details about their transmission frequency, mode, signal strength, and possible relay station.