Thanks for the hospitality, JonD, and for the chance to run on your line! It was a good day out, and I'm pleased if my conversions have helped you choose the route to go down..... I may see if I can get the range issue looked at by someone in due course, Neil Stanton tells me that he has to make the units with a VERY low transmitting power to keep strictly within regs (at least in the US), but he has hinted that someone with a decent practical knowledge of electronics (ie: not me...) could most probably bypass the voltage regulator in the transmitter circuit and feed the Tx chip with the full handset battery voltage (which is still not very much, the handset probably has only one or possibly two Li-Ion cells in it, but would presumably be enough to get a significant range boost compared with the minimal voltage it's getting at the moment....).
Good to see you (and Barney of course) today, and thanks for the bridges and track.
Jon.