The is designed specifically for hydrogen-line (21 cm, ~1420 MHz) reception by combining a SAW band-pass filter with low-noise amplifier stages. According to the manufacturer’s published specs:
📶 Bandwidth / Filter Cut-Off
- The unit has a bandpass region of approximately 65 MHz centered near 1420 MHz. This means it’s engineered to provide high gain and low noise within roughly ±32–33 MHz of 1420 MHz around the center — i.e., roughly 1390 MHz to 1455 MHz (±3 dB points typical for SAW filters).
- The product description states it has very high attenuation outside this ~65 MHz passband — effectively meaning signals significantly below ~1390 MHz or above ~1455 MHz are strongly rejected.
📌 What That Means
- Cut-off bandwidth: approx 1420 ± 32–33 MHz (~65 MHz total passband) where the LNA/filter provides useful gain and low attenuation.
- Outside that range, the SAW filter section drops signals sharply (high attenuation) to keep out unwanted bands and reduce interference.