A cryptic log entry from a ham radio operator!

Breaking it down:

* "05:45" is the time of the log entry.

* "JH1EAF/1" is the call sign of the operator, with "/1" indicating that they are operating in some capacity ( possibly portable or using an amplifier).

* "JP-1790(Isehara Tounoyama Prefectural Park, JP-KN)" is the location where JH1EAF/1 is operating. Here's what it tells us:

+ "JP" indicates that the location is in Japan.

+ "-1790" is a Parks On The Air (POTA) location code for Isehara Tounoyama Prefectural Park, which is in Kanagawa prefecture, Japan (KP).

* "144065.8 CW" is the frequency and mode of operation:

+ "144065.8" is the frequency in Hz (or kHz), indicating that JH1EAF/1 is operating on a 144 MHz band.

+ "CW" indicates that they are using Continuous Wave, or Morse code, to communicate.

* "CW - QTH announced as JCC#1115. TNX POTA/NYP QSO.[JN1OCN]" appears to be the commentary and credits:

+ "CW - QTH" is a note about the operating frequency (CW) and location (QTH).

+ "announced as JCC#1115" suggests that this was announced or reported on Japan Call Channel (JCC) #1115.

+ "TNX POTA/NYP QSO.[JN1OCN]" seems to be a thank-you message to the Parks On The Air (POTA) network and possibly to JN1OCN, another ham radio operator.

In summary, this log entry records a CW contact on 144065.8 Hz by JH1EAF/1 from Isehara Tounoyama Prefectural Park in Japan.