[GreenKeys] Re: GreenKeys Digest, Vol 10, Issue 14

[Wndrrt at cs.com]

Hello group, Jan Bogue the beginner here one week in:

Thanks, Jack, Gil, Don,Rick, Mike and Richard 

Here are some things that I have learned about the 19 set this week:

The gear on the far right end of the horizontal shaft is marked 74913.  The 
gear on the motor (synchronous motor) is marked 74912, and the gear on the 
keyboard shaft is numbered 74595.  All this makes me think that the machine will 
work at 60 wpm.  

Here is a long one.  The terminal block seen from the back and above the 
selector square core HM magnet has three strips and six screws (no switch).  The 
center two are not used.  An orange and black wire goes to the lower left screw 
and a red and black wire goes to the lower right screw.  Two resistors are 
placed across the top outer screws, but they don't add up to 5000 ohms.  I am 
sending a picture to Gil showing this wiring configuration.  The question will 
be: Do I need to set the HM up for series or parallel, to provide 30 or 60 mil 
operation?

>From what I can tell the Polar Neutral Key and wiring has been removed.  I 
also think the polar relay has been removed.  The pictures that I send to Gil 
will confirm this.  

Here is a good question: I keep hearing the phrase "polar magnets."  There is 
a shaft going from front to back of the keyboard behind the keys.  This is 
the one with the gear at one end labeled 74595.  Now this shaft spins what the 
book calls the transmitter mechanism.  When you push a key, this shaft and odd 
collection of washers spins and stops.  Now, does this thing make the pulses 
in much the same way as the TD reads the tape and makes pulses.  Is this think 
the "polar magnets?" 

I have printed out and put together several wiring diagrams.  Using colored 
pens, I have outlined the loop as it goes through the components.  I am sure it 
will get clearer, but would the terminal unit and power supply be plugged 
into the machine through the original phone female receptacles behind the table 
and on the power plug in strip with all the odd receptacles?  I am a little 
lost as to where to start the loop.  I would like to keep the TD and the keyboard 
in the loop. All the factory wires are in place.  If they had been all cut 
from the printer, the loop would seem easy, I guess.

I have been reading the sections on RTTY in my Ham Radio hand books, the 
older versions.  I have a Heath Kit B+ regulated power supply from the 60s.  With 
a resistor, I think it would work as a quick test, loop power supply.  

More to learn this week. Thanks for all your help

Oh yes, for the more advanced members, please design a little holster or 
stand which can be mounted to the right of my 19 set where I can slide in my cell 
phone and type to my friends. Please include a small push up tower and 
matching beam antenna.  The cell phone set should be finished in black wrinkle paint 
with gray and keys green trim.  

Thanks all, Jan on the warm again desert in southern cal.