On 17 Jul 2014, at 17:23, Adam Sampson <ats at offog.org> wrote: > Ian Mason <ukcrypto at sourcetagged.ian.co.uk> writes: > >> Substitute single Li-Ion battery and stubby antenna and you're there. > > Or even a plate antenna, as used in some versions of the Pye Pocketfone > police radios Which used an 18V lead-acid battery, not a single AA cell... ian