diff --git a/rfg_adc_plotter/io/sweep_parser_core.py b/rfg_adc_plotter/io/sweep_parser_core.py
index acffab9..c84673f 100644
--- a/rfg_adc_plotter/io/sweep_parser_core.py
+++ b/rfg_adc_plotter/io/sweep_parser_core.py
@@ -36,7 +36,7 @@ def tty_ch_pair_to_sweep(ch_1: int, ch_2: int) -> float:
     """Reduce a raw CH1/CH2 TTY point to power-like scalar ``ch1^2 + ch2^2``."""
     ch_1_i = int(ch_1)
     ch_2_i = int(ch_2)
-    return float((ch_1_i * ch_1_i) + (ch_2_i * ch_2_i))
+    return float(((ch_1_i * ch_1_i) + (ch_2_i * ch_2_i))**0.5)
 
 
 class AsciiSweepParser: