jazzy%aerospace@sri-unix.UUCP (06/29/83)
From: Richard Fitzgerald <jazzy@aerospace>
Just read a remark from Lauren about modems powered by phone lines. This
was in regard to my piece on the Signalman modem. Well, there was one
thing I neglected to mention. The modem has a built in 9-volt battery
which is charged from the phone line. This is where most of the power
is derived. This is similar to 'weak' phone lines which have batteries
inline to aid them, and these batteries are recharged from the phone line
power. Anyway, the modem I mentioned has been run through alot of use (they
have one in use at local JADE) and I have not seen any problems with it.
In fact it seems cleaner than some I have seen (given the fact it was
running on GTE phone lines too!) Of course for the die hard who does
not want to spend $500-600 for the Hayes which has the a/c power, what is
to keep you from plugging a small a/c-d/c adapter into the modem to give
'clean' power?
-rich (jazzy@aerospace)