Hi Bruce

The good news is that the alarm is working, my son has built two more one is in the field and the second is ready to go on to a site in London. The Flash Lab is very neat in its simplicity, which is its strength, I would recomend it to anyone. Have you tried one Bruce? :-)

I dug out the original PBP disks and programmed the Flash Lab board and the result was the same, I have to use the correct number of digits for the telephone number to work. So my conclusion is that the change has nothing to do with the Flash Lab board being 40 or 20 Mhz and nothing to do with the program.

The modem is different, on the original alarm I used a siemens M20. I can not test this as I do not have one to hand, they are all out in the field.

Steve