AMA-4251 Series Crossband Coupler used to diplex 800-900MHz AMPS/USDC & GSM with 1800MHz systems such as PCS, DCS 1800, PCS & 3G Next Generation Networks. AMA-4251-N N type AMA-4251-NH N Type High Power with Heatshrink AMA-4251-716 7/16 connectorised