ISTR that there was talk here about modifying the American Model 100 to be switchable to the other modulation.
On Sat, 26 Sep 2020 at 06:36, Francesco Messineo <[email protected]> wrote: > > On Fri, Sep 25, 2020 at 11:45 PM Bert Put <[email protected]> wrote: > > > > As an owner of a M-100 while in Australia, I remember that we were > > forbidden to connect the built-in modem to the Australian telephone > > network. We had to use an external modem. I do not know if that is the > > same in the UK, but it's quite likely. > > > > Cheers, Bert > > that's what also happened in Italy. The Olivetti M10's internal modem > was never approved by local regulations to be connected to > the phone network (also probably because the modem IC is hardwired to > BELL modulation and instead we were using CCITT modes). In facts, my > M10 had most of the modem components snipped out of the PCB, and one > of the receive opamp was shortcircuited with a solder blob. I've > replaced all the missing components, calculating them to work with > CCITT V.21 modulation > and re-wired the modem IC to use V.21 of course, however I'm still not > able to have the modem work, I needed to investigate > what's still wrong with it, but other project (and life) took precedence so > far. > Frank IZ8DWF
