HeyPhone Cave Rescue Communication System User Manual HEYPHONE USER MANUAL BCRC HeyPhone On behalf of BCRC I would like to record our thanks to members of CREG and the BCRC team for their hard work in the design construction and introduction into service of the HeyPhone There will No doubt be modifications and improvements that in years to come may lead to a Mark 2 unit Even with its introduction into service though it s important to keep an active d
CAVE RADIO BCRC HeyPhone Physical Construction Brian Jopling Jopo describes the mechanical design philosophy for the HeyPhone and gives some instruction for those intending to build a unit or to use similar techniques for other projects Introduction The electronic design of the BCRC HeyPhone has already been published Hey 2000 amp Bedford 2001 This completes the public domain documentation article by providing details of the mechanical construction