trying to receive RF signals sent bij an outdoor weather station sensor

“8487101C” should be: 1000 0100 1000 0111 0001 0000 0001 1100

“88190AAB” should be: 1000 1000 0001 1001 0000 1010 1010 1011

Looks right to me!

And:

var data = "10001000000110010000101010101011";
for (var nibble=0;nibble<8;nibble++) {
  console.log(parseInt(data.substr(nibble*­4,4),2).toString(16));
}
// prints...
8
8
1
9
0
a
a
b