Band Pass Filter (MT4)

The Band Pass Filter is a cycle/trend tool that passes a band of frequencies while attenuating the rest. In trading terms: it helps track the dominant swing while reducing noise, so you can read direction and turn-points more clearly on MetaTrader 4.

Why use a band‑pass instead of a moving average?

• MAs blur everything the same way. A band‑pass emphasizes a target cycle length and suppresses slower/faster moves.
• This translates into cleaner swings and clearer bias in choppy markets.
• With the MTF (multi‑timeframe) option you can pull a higher‑TF filter into a lower‑TF chart.

Signals

1. Zero‑line / midline crosses → momentum flip (above = bullish bias, below = bearish).
2. Slope → rising slope supports longs, falling slope supports shorts.
3. Pullback to the filter → look for continuation entries when price retraces to the line and bounces.
4. Break & hold beyond the band (if your template draws an envelope) → trend continuation.
5. (Optional) Confluence with S/R, session highs/lows, or your strategy’s trigger.

Inputs (most useful)

• Period / Cycle length — the core frequency window; smaller = faster (more signals), larger = smoother.
• MTF timeframe — apply a higher timeframe filter to the current chart.
• Price source — Close/Typical/Weighted.
• Alerts — pop‑up / sound / push on crosses or slope changes.
• Colors & widths — make bullish/bearish states obvious at a glance.

Suggested use

• M5–M15 for intraday swings on majors/indices.
• M30–H4 to track medium swings and trend continuation.
• Use with ATR‑based stops/trailing to respect volatility.

Installation (MT4)

1. Open MetaTrader 4 → File → Open Data Folder.
2. Go to MQL4/Indicators and copy band pass filter (mtf).ex4 there.
3. Restart MT4 (or refresh Navigator) and drag Band Pass Filter onto a chart.
4. Adjust inputs → OK.

FAQ

Does it repaint? No; it’s a standard MT4 indicator calculated on closed candles.
Best markets? FX majors/crosses, indices, metals — anything your broker offers on MT4.
Can I use it in EAs? Yes, via iCustom or by attaching it to the chart.

Disclaimer: Use on demo first. No indicator guarantees profits; risk management is essential.