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...very useful driver circuit which John sells in kit form on his [http://www.g4bao.com website] which when driven by a Portsdown / DATVexpress transmitter wil [[File:G4BAO driver.JPG|400px]]

Photo from G4BAO web page ...om the Ionica main board to make a simple transverter as described on John G4BAO's site - don't forget, it is much easier now as we can use the ADF 4351 as