RadCom Basics May 2022, Edition 28

2 RadCom Basics A RADIO SOCIETY OF GREAT BRITAIN’S MEMBERS’ MAGAZINE EDITOR: Lee Aldridge, G4EJB E-mail radcombasics@rsgb.org.uk All contributions and correspondence concerning the content of RadCom Basics should be sent to:The Editor, RadCom, 3 Abbey Court, Fraser Road, Priory Business Park, Bedford MK44 3WHTelephone 01234 832 700 e-mail radcombasics@rsgb.org.uk Notices to readers concerning errors and omissions can be found at www.rsgb.org/ radcom- basics RadCom Basics is published by the Radio Society of Great Britain as an addition to its official journal, RadCom , and is avaiable free to all Members of the Society via the RSGB website at www.rsgb.org All material in RadCom Basics is subject to editing for length, clarity, style, punctuation, grammar, legality and taste. No responsibility can be assumed for the return of unsolicited material (if in doubt, call us first!) © Radio Society of Great Britain 2022. Articles are accepted on the strict under- standing that they are not currently on offer to any other publication. Unless otherwise indicated the RSGB has purchased all rights to published articles. Cover image: Working Portable - James Stevens, M0JCQ