diff --git a/rfg_adc_plotter/gui/pyqtgraph_backend.py b/rfg_adc_plotter/gui/pyqtgraph_backend.py
index 423e10d..7783455 100644
--- a/rfg_adc_plotter/gui/pyqtgraph_backend.py
+++ b/rfg_adc_plotter/gui/pyqtgraph_backend.py
@@ -2880,15 +2880,17 @@ def run_pyqtgraph(args) -> None:
                 sec_ch1 = secondary_payload.get("ch1")
                 sec_ch2 = secondary_payload.get("ch2")
                 if sec_ch1 is not None:
-                    runtime.full_secondary_ch1 = np.asarray(
+                    sec_ch1_calibrated = np.asarray(
                         calibrate_freqs({"F": base_freqs, "I": sec_ch1})["I"],
                         dtype=np.float32,
                     )
+                    runtime.full_secondary_ch1 = convert_tty_i16_to_voltage(sec_ch1_calibrated, tty_range_v)
                 if sec_ch2 is not None:
-                    runtime.full_secondary_ch2 = np.asarray(
+                    sec_ch2_calibrated = np.asarray(
                         calibrate_freqs({"F": base_freqs, "I": sec_ch2})["I"],
                         dtype=np.float32,
                     )
+                    runtime.full_secondary_ch2 = convert_tty_i16_to_voltage(sec_ch2_calibrated, tty_range_v)
             refresh_current_window(push_to_ring=True)
             processed_frames += 1
             last_packet_processed_at = time.time()