diff --git a/RFG_ADC_dataplotter.py b/RFG_ADC_dataplotter.py
index 9b9321e..fab8927 100755
--- a/RFG_ADC_dataplotter.py
+++ b/RFG_ADC_dataplotter.py
@@ -31,6 +31,7 @@ from typing import Optional, Tuple
 import numpy as np
 
 WF_WIDTH = 1000  # максимальное число точек в ряду водопада
+FFT_LEN = 1024   # длина БПФ для спектра/водопада спектров
 
 
 def try_open_pyserial(path: str, baud: int, timeout: float):
@@ -383,7 +384,8 @@ def main():
     reader.start()
 
     # Графика
-    fig, (ax_line, ax_img) = plt.subplots(1, 2, figsize=(12, 6))
+    fig, axs = plt.subplots(2, 2, figsize=(12, 8))
+    (ax_line, ax_img), (ax_fft, ax_spec) = axs
     fig.canvas.manager.set_window_title(args.title) if hasattr(fig.canvas.manager, "set_window_title") else None
     fig.tight_layout()
 
@@ -395,6 +397,11 @@ def main():
     ring = None  # type: Optional[np.ndarray]
     head = 0
     y_min, y_max = None, None
+    # FFT состояние
+    fft_bins = FFT_LEN // 2 + 1
+    ring_fft = None  # type: Optional[np.ndarray]
+    y_min_fft, y_max_fft = None, None
+    freq_shared: Optional[np.ndarray] = None
 
     # Линейный график последнего свипа
     line_obj, = ax_line.plot([], [], lw=1)
@@ -402,14 +409,22 @@ def main():
     ax_line.set_xlabel("X")
     ax_line.set_ylabel("Y")
 
-    fixed_ylim: Optional[Tuple[float, float]] = None
+    # Линейный график спектра текущего свипа
+    fft_line_obj, = ax_fft.plot([], [], lw=1)
+    ax_fft.set_title("Спектр (|FFT|, дБ)")
+    ax_fft.set_xlabel("Бин")
+    ax_fft.set_ylabel("Амплитуда, дБ")
+
+    # Фиксированный диапазон по Y для последнего свипа: 0..4095 (12-бит без знака)
+    fixed_ylim: Optional[Tuple[float, float]] = (0.0, float(2 ** 12 - 1))
+    # CLI переопределение при необходимости
     if args.ylim:
         try:
             y0, y1 = args.ylim.split(",")
             fixed_ylim = (float(y0), float(y1))
-            ax_line.set_ylim(fixed_ylim)
         except Exception:
             sys.stderr.write("[warn] Некорректный формат --ylim, игнорирую. Ожидалось min,max\n")
+    ax_line.set_ylim(fixed_ylim)
 
     # Водопад (будет инициализирован при первом свипе)
     img_obj = ax_img.imshow(
@@ -423,13 +438,25 @@ def main():
     ax_img.set_xlabel("X")
     ax_img.set_ylabel("Номер свипа (время →)")
 
+    # Водопад спектров
+    img_fft_obj = ax_spec.imshow(
+        np.zeros((1, 1), dtype=np.float32),
+        aspect="auto",
+        interpolation="nearest",
+        origin="upper",
+        cmap=args.cmap,
+    )
+    ax_spec.set_title("Водопад спектров (дБ)")
+    ax_spec.set_xlabel("Бин")
+    ax_spec.set_ylabel("Номер свипа (время →)")
+
     # Для контроля частоты обновления
     max_fps = max(1.0, float(args.max_fps))
     interval_ms = int(1000.0 / max_fps)
     frames_since_ylim_update = 0
 
     def ensure_buffer(_w: int):
-        nonlocal ring, width, head, x_shared
+        nonlocal ring, width, head, x_shared, ring_fft, freq_shared
         if ring is not None:
             return
         width = WF_WIDTH
@@ -441,9 +468,16 @@ def main():
         img_obj.set_extent((0, width - 1 if width > 0 else 1, 0, max_sweeps - 1))
         ax_img.set_xlim(0, max(1, width - 1))
         ax_img.set_ylim(max_sweeps - 1, 0)
+        # FFT буферы
+        ring_fft = np.full((max_sweeps, fft_bins), np.nan, dtype=np.float32)
+        img_fft_obj.set_data(ring_fft)
+        img_fft_obj.set_extent((0, fft_bins - 1, 0, max_sweeps - 1))
+        ax_spec.set_xlim(0, max(1, fft_bins - 1))
+        ax_spec.set_ylim(max_sweeps - 1, 0)
+        freq_shared = np.arange(fft_bins, dtype=np.int32)
 
     def push_sweep(s: np.ndarray):
-        nonlocal ring, head, y_min, y_max
+        nonlocal ring, head, y_min, y_max, ring_fft, y_min_fft, y_max_fft
         if s is None or s.size == 0 or ring is None:
             return
         # Нормализуем длину до фиксированной ширины
@@ -460,6 +494,38 @@ def main():
             y_min = float(sv_min)
         if y_max is None or (not np.isnan(sv_max) and sv_max > y_max):
             y_max = float(sv_max)
+        # FFT строка (дБ)
+        if ring_fft is not None:
+            bins = ring_fft.shape[1]
+            # Подготовка входа FFT_LEN, замена NaN на 0
+            take_fft = min(int(s.size), FFT_LEN)
+            if take_fft <= 0:
+                fft_row = np.full((bins,), np.nan, dtype=np.float32)
+            else:
+                fft_in = np.zeros((FFT_LEN,), dtype=np.float32)
+                seg = s[:take_fft]
+                if isinstance(seg, np.ndarray):
+                    seg = np.nan_to_num(seg, nan=0.0).astype(np.float32, copy=False)
+                else:
+                    seg = np.asarray(seg, dtype=np.float32)
+                    seg = np.nan_to_num(seg, nan=0.0)
+                # Окно Хэннинга
+                win = np.hanning(take_fft).astype(np.float32)
+                fft_in[:take_fft] = seg * win
+                spec = np.fft.rfft(fft_in)
+                mag = np.abs(spec).astype(np.float32)
+                fft_row = 20.0 * np.log10(mag + 1e-9)
+                if fft_row.shape[0] != bins:
+                    # rfft длиной FFT_LEN даёт bins == FFT_LEN//2+1
+                    fft_row = fft_row[:bins]
+            ring_fft[(head - 1) % ring_fft.shape[0], :] = fft_row
+            # Экстремумы для цветовой шкалы
+            fr_min = np.nanmin(fft_row)
+            fr_max = np.nanmax(fft_row)
+            if y_min_fft is None or (not np.isnan(fr_min) and fr_min < y_min_fft):
+                y_min_fft = float(fr_min)
+            if y_max_fft is None or (not np.isnan(fr_max) and fr_max > y_max_fft):
+                y_max_fft = float(fr_max)
 
     def drain_queue():
         nonlocal current_sweep
@@ -483,6 +549,13 @@ def main():
             return ring
         return np.roll(ring, -head, axis=0)
 
+    def make_display_ring_fft():
+        if ring_fft is None:
+            return np.zeros((1, 1), dtype=np.float32)
+        if head == 0:
+            return ring_fft
+        return np.roll(ring_fft, -head, axis=0)
+
     def update(_frame):
         nonlocal frames_since_ylim_update
         changed = drain_queue() > 0
@@ -496,16 +569,26 @@ def main():
             line_obj.set_data(xs, current_sweep)
             # Лимиты по X постоянные под текущую ширину
             ax_line.set_xlim(0, max(1, current_sweep.size - 1))
-            # Y-лимиты: фиксированные либо периодическая автоподстройка
-            if fixed_ylim is None:
-                frames_since_ylim_update += 1
-                if frames_since_ylim_update >= 3:  # реже трогаем ось для скорости
-                    y0 = np.nanmin(current_sweep)
-                    y1 = np.nanmax(current_sweep)
-                    if np.isfinite(y0) and np.isfinite(y1):
-                        margin = 0.05 * max(1.0, float(y1 - y0))
-                        ax_line.set_ylim(y0 - margin, y1 + margin)
-                    frames_since_ylim_update = 0
+            # Y-лимиты фиксированы (±2048) или из --ylim; не автоподстраиваем
+
+            # Обновление спектра текущего свипа
+            take_fft = min(int(current_sweep.size), FFT_LEN)
+            if take_fft > 0 and freq_shared is not None:
+                fft_in = np.zeros((FFT_LEN,), dtype=np.float32)
+                seg = np.nan_to_num(current_sweep[:take_fft], nan=0.0).astype(np.float32, copy=False)
+                win = np.hanning(take_fft).astype(np.float32)
+                fft_in[:take_fft] = seg * win
+                spec = np.fft.rfft(fft_in)
+                mag = np.abs(spec).astype(np.float32)
+                fft_vals = 20.0 * np.log10(mag + 1e-9)
+                xs_fft = freq_shared
+                if fft_vals.size > xs_fft.size:
+                    fft_vals = fft_vals[: xs_fft.size]
+                fft_line_obj.set_data(xs_fft[: fft_vals.size], fft_vals)
+                # Авто-диапазон по Y для спектра
+                if np.isfinite(np.nanmin(fft_vals)) and np.isfinite(np.nanmax(fft_vals)):
+                    ax_fft.set_xlim(0, max(1, xs_fft.size - 1))
+                    ax_fft.set_ylim(float(np.nanmin(fft_vals)), float(np.nanmax(fft_vals)))
 
         # Обновление водопада
         if changed and ring is not None:
@@ -516,8 +599,16 @@ def main():
                 if y_min != y_max:
                     img_obj.set_clim(vmin=y_min, vmax=y_max)
 
+        # Обновление водопада спектров
+        if changed and ring_fft is not None:
+            disp_fft = make_display_ring_fft()
+            img_fft_obj.set_data(disp_fft)
+            if y_min_fft is not None and y_max_fft is not None and np.isfinite(y_min_fft) and np.isfinite(y_max_fft):
+                if y_min_fft != y_max_fft:
+                    img_fft_obj.set_clim(vmin=y_min_fft, vmax=y_max_fft)
+
         # Возвращаем обновлённые артисты
-        return (line_obj, img_obj)
+        return (line_obj, img_obj, fft_line_obj, img_fft_obj)
 
     ani = FuncAnimation(fig, update, interval=interval_ms, blit=False)
 
@@ -559,14 +650,14 @@ def run_pyqtgraph(args):
     win = pg.GraphicsLayoutWidget(show=True, title=args.title)
     win.resize(1200, 600)
 
-    # Плот последнего свипа (слева)
+    # Плот последнего свипа (слева-сверху)
     p_line = win.addPlot(row=0, col=0, title="Последний свип")
     p_line.showGrid(x=True, y=True, alpha=0.3)
     curve = p_line.plot(pen=pg.mkPen((80, 120, 255), width=1))
     p_line.setLabel("bottom", "X")
     p_line.setLabel("left", "Y")
 
-    # Водопад (справа)
+    # Водопад (справа-сверху)
     p_img = win.addPlot(row=0, col=1, title="Водопад (последние свипы)")
     p_img.invertY(True)  # 0 сверху, новые снизу
     p_img.showGrid(x=False, y=False)
@@ -575,6 +666,22 @@ def run_pyqtgraph(args):
     img = pg.ImageItem()
     p_img.addItem(img)
 
+    # Спектр (слева-снизу)
+    p_fft = win.addPlot(row=1, col=0, title="Спектр (|FFT|, дБ)")
+    p_fft.showGrid(x=True, y=True, alpha=0.3)
+    curve_fft = p_fft.plot(pen=pg.mkPen((255, 120, 80), width=1))
+    p_fft.setLabel("bottom", "Бин")
+    p_fft.setLabel("left", "Амплитуда, дБ")
+
+    # Водопад спектров (справа-снизу)
+    p_spec = win.addPlot(row=1, col=1, title="Водопад спектров (дБ)")
+    p_spec.invertY(True)
+    p_spec.showGrid(x=False, y=False)
+    p_spec.setLabel("bottom", "Бин")
+    p_spec.setLabel("left", "Номер свипа (время →)")
+    img_fft = pg.ImageItem()
+    p_spec.addItem(img_fft)
+
     # Состояние
     ring: Optional[np.ndarray] = None
     head = 0
@@ -582,17 +689,23 @@ def run_pyqtgraph(args):
     x_shared: Optional[np.ndarray] = None
     current_sweep: Optional[np.ndarray] = None
     y_min, y_max = None, None
-    fixed_ylim: Optional[Tuple[float, float]] = None
+    # Для спектров
+    fft_bins = FFT_LEN // 2 + 1
+    ring_fft: Optional[np.ndarray] = None
+    freq_shared: Optional[np.ndarray] = None
+    y_min_fft, y_max_fft = None, None
+    # Фиксированный диапазон по Y: 0..4095 (можно переопределить --ylim)
+    fixed_ylim: Optional[Tuple[float, float]] = (0.0, float(2 ** 12 - 1))
     if args.ylim:
         try:
             y0, y1 = args.ylim.split(",")
             fixed_ylim = (float(y0), float(y1))
-            p_line.setYRange(fixed_ylim[0], fixed_ylim[1], padding=0)
         except Exception:
             pass
+    p_line.setYRange(fixed_ylim[0], fixed_ylim[1], padding=0)
 
     def ensure_buffer(_w: int):
-        nonlocal ring, head, width, x_shared
+        nonlocal ring, head, width, x_shared, ring_fft, freq_shared
         if ring is not None:
             return
         width = WF_WIDTH
@@ -602,9 +715,15 @@ def run_pyqtgraph(args):
         img.setImage(ring, autoLevels=False)
         p_img.setRange(xRange=(0, max(1, width - 1)), yRange=(0, max_sweeps - 1), padding=0)
         p_line.setXRange(0, max(1, width - 1), padding=0)
+        # FFT
+        ring_fft = np.full((max_sweeps, fft_bins), np.nan, dtype=np.float32)
+        img_fft.setImage(ring_fft, autoLevels=False)
+        p_spec.setRange(xRange=(0, max(1, fft_bins - 1)), yRange=(0, max_sweeps - 1), padding=0)
+        p_fft.setXRange(0, max(1, fft_bins - 1), padding=0)
+        freq_shared = np.arange(fft_bins, dtype=np.int32)
 
     def push_sweep(s: np.ndarray):
-        nonlocal ring, head, y_min, y_max
+        nonlocal ring, head, y_min, y_max, ring_fft, y_min_fft, y_max_fft
         if s is None or s.size == 0 or ring is None:
             return
         w = ring.shape[1]
@@ -620,6 +739,29 @@ def run_pyqtgraph(args):
             y_min = float(sv_min)
         if y_max is None or (not np.isnan(sv_max) and sv_max > y_max):
             y_max = float(sv_max)
+        # FFT строка (дБ)
+        if ring_fft is not None:
+            bins = ring_fft.shape[1]
+            take_fft = min(int(s.size), FFT_LEN)
+            if take_fft > 0:
+                fft_in = np.zeros((FFT_LEN,), dtype=np.float32)
+                seg = np.nan_to_num(s[:take_fft], nan=0.0).astype(np.float32, copy=False)
+                win = np.hanning(take_fft).astype(np.float32)
+                fft_in[:take_fft] = seg * win
+                spec = np.fft.rfft(fft_in)
+                mag = np.abs(spec).astype(np.float32)
+                fft_row = 20.0 * np.log10(mag + 1e-9)
+                if fft_row.shape[0] != bins:
+                    fft_row = fft_row[:bins]
+            else:
+                fft_row = np.full((bins,), np.nan, dtype=np.float32)
+            ring_fft[(head - 1) % ring_fft.shape[0], :] = fft_row
+            fr_min = np.nanmin(fft_row)
+            fr_max = np.nanmax(fft_row)
+            if y_min_fft is None or (not np.isnan(fr_min) and fr_min < y_min_fft):
+                y_min_fft = float(fr_min)
+            if y_max_fft is None or (not np.isnan(fr_max) and fr_max > y_max_fft):
+                y_max_fft = float(fr_max)
 
     def drain_queue():
         nonlocal current_sweep
@@ -659,6 +801,22 @@ def run_pyqtgraph(args):
                     margin = 0.05 * max(1.0, (y1 - y0))
                     p_line.setYRange(y0 - margin, y1 + margin, padding=0)
 
+            # Обновим спектр
+            take_fft = min(int(current_sweep.size), FFT_LEN)
+            if take_fft > 0 and freq_shared is not None:
+                fft_in = np.zeros((FFT_LEN,), dtype=np.float32)
+                seg = np.nan_to_num(current_sweep[:take_fft], nan=0.0).astype(np.float32, copy=False)
+                win = np.hanning(take_fft).astype(np.float32)
+                fft_in[:take_fft] = seg * win
+                spec = np.fft.rfft(fft_in)
+                mag = np.abs(spec).astype(np.float32)
+                fft_vals = 20.0 * np.log10(mag + 1e-9)
+                xs_fft = freq_shared
+                if fft_vals.size > xs_fft.size:
+                    fft_vals = fft_vals[: xs_fft.size]
+                curve_fft.setData(xs_fft[: fft_vals.size], fft_vals)
+                p_fft.setYRange(float(np.nanmin(fft_vals)), float(np.nanmax(fft_vals)), padding=0)
+
         if changed and ring is not None:
             disp = ring if head == 0 else np.roll(ring, -head, axis=0)
             if y_min is not None and y_max is not None and y_min != y_max and np.isfinite(y_min) and np.isfinite(y_max):
@@ -666,6 +824,13 @@ def run_pyqtgraph(args):
             else:
                 img.setImage(disp, autoLevels=False)
 
+        if changed and ring_fft is not None:
+            disp_fft = ring_fft if head == 0 else np.roll(ring_fft, -head, axis=0)
+            if y_min_fft is not None and y_max_fft is not None and y_min_fft != y_max_fft and np.isfinite(y_min_fft) and np.isfinite(y_max_fft):
+                img_fft.setImage(disp_fft, autoLevels=False, levels=(y_min_fft, y_max_fft))
+            else:
+                img_fft.setImage(disp_fft, autoLevels=False)
+
     timer = pg.QtCore.QTimer()
     timer.timeout.connect(update)
     timer.start(interval_ms)