MainChart_EMA_BB is a main‑chart overlay indicator for cTrader that combines:

• Exponential Moving Averages (EMA 50 & EMA 200)
• Bollinger Bands (Upper / Middle / Lower)

Indicator Components

Exponential Moving Averages (EMA)

Two EMAs are available:

EMADefault PeriodDefault Color

EMA 50

50

Green

EMA 200

200

Red

Purpose:

• Trend direction
• Dynamic support/resistance
• EMA 50 above EMA 200 → bullish bias
• EMA 50 below EMA 200 → bearish bias

3.2 Bollinger Bands

Bollinger Bands consist of:

• Upper Band
• Middle Band (EMA-based)
• Lower Band

Default Settings:

• Period: 20
• Standard Deviation: 2.0
• MA Type: Exponential

Purpose:

• Volatility measurement
• Overbought / oversold zones
• Price touching upper band → potential exhaustion
• Price touching lower band → potential bounce

Parameters Explained

EMA Parameters

• Show EMA 50: Enable/disable EMA 50
• EMA 50 Period: Calculation period
• Show EMA 200: Enable/disable EMA 200
• EMA 200 Period: Calculation period

Bollinger Bands Parameters

• Show Bollinger Bands: Enable/disable BB
• BB Period: Lookback period
• BB Std Dev: Volatility multiplier

Typical Trading Usage

Trend Confirmation

• EMA 50 above EMA 200
• Prefer long trades only

Reversal / Pullback

• Price pulls back to EMA 50
• Bollinger Band squeeze then expansion