5 Nov
2015
5 Nov
'15
1:18 p.m.
The Baudot thing sure brings back some memories. I
still recall hooking
teletype's up thru KW-7 boxes, and performing ryryryryryryryryr test.
I don't recall enough of the specifics, but it was either
Y = 10101
R = 01010
or reversed.
Ah yes... One of the classic tests for problems in the receiver and comms link, but
not the only one. A system with poor low frequency response (for example) might
handle alternating mark and space correctly but fall down on things like 11110
I have a test message generator that can sent that, various alternating signals (without
start and stop bits), user-entered characters (on a row of switches) and so on. And
distort them by lengthening and shortening pulses to check how well the receiving
device copes with mangled signals. I also have the distortion measuring set, a special
oscilloscope to check for distorted signals, test relays for contact bounce, bias and
transit time, etc.
I really must get my Creed 7E and 444 running again...
-tony