21 Feb
2013
21 Feb
'13
3:29 p.m.
Totally. As if the 45.45 bps and 1.4 stop bits and
FIGS/LTRS sticky shifts
Over here, there were 50 buad and 75 buad Murray code machines (it's not
strictly Baudot).
aren't alien enough, the 60 mA current loop uses
voltages that you normally
try to keep *away* from digital electronics (I shocked myself a bunch of
Ass opposed to digital electormechanics, I assume :-)
Actually, the selector magnet (receive solenoid, wahtever) would work at
quite low voltages. But it has signifcant inductance, not suprisingly.
Now, since the RL cirucit time constant is L/R, if oyuy increase the
supply voltage, you need a larger series resistance to keep the current
down to the right vlaue, so the time constant goes _down_, implying a
faster resposne. That';s why you had 80V or so on the selector magnet
circuit.
times with RTTY stuff -- never happened with model
33s).
Well, IIRC, the Model 33 puts mains and signals on the smae barrier
strip. And that little trip switch fo the reader solenoid on top of the
transmitter shaft is not isolated from the mains (!). Don;'t ask how I
found that out....
-tony